// SPDX-License-Identifier: GPL-2.0-or-later/* * Copyright (c) 2016 Mellanox Technologies. All rights reserved. * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com> */ #include <net/genetlink.h>#include <net/sock.h> #include "devl_internal.h" #define DEVLINK_NL_FLAG_NEED_PORT		BIT(0)#define DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT	BIT(1)#define DEVLINK_NL_FLAG_NEED_DEV_LOCK		BIT(2) static const struct genl_multicast_group devlink_nl_mcgrps[] = {	[DEVLINK_MCGRP_CONFIG] = { .name = DEVLINK_GENL_MCGRP_CONFIG_NAME },}; struct devlink_nl_sock_priv {	struct devlink_obj_desc __rcu *flt;	spinlock_t flt_lock; /* Protects flt. */}; static void devlink_nl_sock_priv_init(void *priv){	struct devlink_nl_sock_priv *sk_priv = priv; 	spin_lock_init(&sk_priv->flt_lock);} static void devlink_nl_sock_priv_destroy(void *priv){	struct devlink_nl_sock_priv *sk_priv = priv;	struct devlink_obj_desc *flt; 	flt = rcu_dereference_protected(sk_priv->flt, true);	kfree_rcu(flt, rcu);} int devlink_nl_notify_filter_set_doit(struct sk_buff *skb,				      struct genl_info *info){	struct devlink_nl_sock_priv *sk_priv;	struct nlattr **attrs = info->attrs;	struct devlink_obj_desc *flt;	size_t data_offset = 0;	size_t data_size = 0;	char *pos; 	if (attrs[DEVLINK_ATTR_BUS_NAME])		data_size = size_add(data_size,				     nla_len(attrs[DEVLINK_ATTR_BUS_NAME]) + 1);	if (attrs[DEVLINK_ATTR_DEV_NAME])		data_size = size_add(data_size,				     nla_len(attrs[DEVLINK_ATTR_DEV_NAME]) + 1); 	flt = kzalloc(size_add(sizeof(*flt), data_size), GFP_KERNEL);	if (!flt)		return -ENOMEM; 	pos = (char *) flt->data;	if (attrs[DEVLINK_ATTR_BUS_NAME]) {		data_offset += nla_strscpy(pos,					   attrs[DEVLINK_ATTR_BUS_NAME],					   data_size) + 1;		flt->bus_name = pos;		pos += data_offset;	}	if (attrs[DEVLINK_ATTR_DEV_NAME]) {		nla_strscpy(pos, attrs[DEVLINK_ATTR_DEV_NAME],			    data_size - data_offset);		flt->dev_name = pos;	} 	if (attrs[DEVLINK_ATTR_PORT_INDEX]) {		flt->port_index = nla_get_u32(attrs[DEVLINK_ATTR_PORT_INDEX]);		flt->port_index_valid = true;	} 	/* Don't attach empty filter. */	if (!flt->bus_name && !flt->dev_name && !flt->port_index_valid) {		kfree(flt);		flt = NULL;	} 	sk_priv = genl_sk_priv_get(&devlink_nl_family, NETLINK_CB(skb).sk);	if (IS_ERR(sk_priv)) {		kfree(flt);		return PTR_ERR(sk_priv);	}	spin_lock(&sk_priv->flt_lock);	flt = rcu_replace_pointer(sk_priv->flt, flt,				  lockdep_is_held(&sk_priv->flt_lock));	spin_unlock(&sk_priv->flt_lock);	kfree_rcu(flt, rcu);	return 0;} static bool devlink_obj_desc_match(const struct devlink_obj_desc *desc,				   const struct devlink_obj_desc *flt){	if (desc->bus_name && flt->bus_name &&	    strcmp(desc->bus_name, flt->bus_name))		return false;	if (desc->dev_name && flt->dev_name &&	    strcmp(desc->dev_name, flt->dev_name))		return false;	if (desc->port_index_valid && flt->port_index_valid &&	    desc->port_index != flt->port_index)		return false;	return true;} int devlink_nl_notify_filter(struct sock *dsk, struct sk_buff *skb, void *data){	struct devlink_obj_desc *desc = data;	struct devlink_nl_sock_priv *sk_priv;	struct devlink_obj_desc *flt;	int ret = 0; 	rcu_read_lock();	sk_priv = __genl_sk_priv_get(&devlink_nl_family, dsk);	if (!IS_ERR_OR_NULL(sk_priv)) {		flt = rcu_dereference(sk_priv->flt);		if (flt)			ret = !devlink_obj_desc_match(desc, flt);	}	rcu_read_unlock();	return ret;} int devlink_nl_put_nested_handle(struct sk_buff *msg, struct net *net,				 struct devlink *devlink, int attrtype){	struct nlattr *nested_attr;	struct net *devl_net; 	nested_attr = nla_nest_start(msg, attrtype);	if (!nested_attr)		return -EMSGSIZE;	if (devlink_nl_put_handle(msg, devlink))		goto nla_put_failure; 	rcu_read_lock();	devl_net = read_pnet_rcu(&devlink->_net);	if (!net_eq(net, devl_net)) {		int id = peernet2id_alloc(net, devl_net, GFP_ATOMIC); 		rcu_read_unlock();		if (nla_put_s32(msg, DEVLINK_ATTR_NETNS_ID, id))			return -EMSGSIZE;	} else {		rcu_read_unlock();	} 	nla_nest_end(msg, nested_attr);	return 0; nla_put_failure:	nla_nest_cancel(msg, nested_attr);	return -EMSGSIZE;} int devlink_nl_msg_reply_and_new(struct sk_buff **msg, struct genl_info *info){	int err; 	if (*msg) {		err = genlmsg_reply(*msg, info);		if (err)			return err;	}	*msg = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);	if (!*msg)		return -ENOMEM;	return 0;} struct devlink *devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs,			    bool dev_lock){	struct devlink *devlink;	unsigned long index;	char *busname;	char *devname; 	if (!attrs[DEVLINK_ATTR_BUS_NAME] || !attrs[DEVLINK_ATTR_DEV_NAME])		return ERR_PTR(-EINVAL); 	busname = nla_data(attrs[DEVLINK_ATTR_BUS_NAME]);	devname = nla_data(attrs[DEVLINK_ATTR_DEV_NAME]); 	devlinks_xa_for_each_registered_get(net, index, devlink) {		if (strcmp(devlink->dev->bus->name, busname) == 0 &&		    strcmp(dev_name(devlink->dev), devname) == 0) {			devl_dev_lock(devlink, dev_lock);			if (devl_is_registered(devlink))				return devlink;			devl_dev_unlock(devlink, dev_lock);		}		devlink_put(devlink);	} 	return ERR_PTR(-ENODEV);} static int __devlink_nl_pre_doit(struct sk_buff *skb, struct genl_info *info,				 u8 flags){	bool dev_lock = flags & DEVLINK_NL_FLAG_NEED_DEV_LOCK;	struct devlink_port *devlink_port;	struct devlink *devlink;	int err; 	devlink = devlink_get_from_attrs_lock(genl_info_net(info), info->attrs,					      dev_lock);	if (IS_ERR(devlink))		return PTR_ERR(devlink); 	info->user_ptr[0] = devlink;	if (flags & DEVLINK_NL_FLAG_NEED_PORT) {		devlink_port = devlink_port_get_from_info(devlink, info);		if (IS_ERR(devlink_port)) {			err = PTR_ERR(devlink_port);			goto unlock;		}		info->user_ptr[1] = devlink_port;	} else if (flags & DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT) {		devlink_port = devlink_port_get_from_info(devlink, info);		if (!IS_ERR(devlink_port))			info->user_ptr[1] = devlink_port;	}	return 0; unlock:	devl_dev_unlock(devlink, dev_lock);	devlink_put(devlink);	return err;} int devlink_nl_pre_doit(const struct genl_split_ops *ops,			struct sk_buff *skb, struct genl_info *info){	return __devlink_nl_pre_doit(skb, info, 0);} int devlink_nl_pre_doit_port(const struct genl_split_ops *ops,			     struct sk_buff *skb, struct genl_info *info){	return __devlink_nl_pre_doit(skb, info, DEVLINK_NL_FLAG_NEED_PORT);} int devlink_nl_pre_doit_dev_lock(const struct genl_split_ops *ops,				 struct sk_buff *skb, struct genl_info *info){	return __devlink_nl_pre_doit(skb, info, DEVLINK_NL_FLAG_NEED_DEV_LOCK);} int devlink_nl_pre_doit_port_optional(const struct genl_split_ops *ops,				      struct sk_buff *skb,				      struct genl_info *info){	return __devlink_nl_pre_doit(skb, info, DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT);} static void __devlink_nl_post_doit(struct sk_buff *skb, struct genl_info *info,				   u8 flags){	bool dev_lock = flags & DEVLINK_NL_FLAG_NEED_DEV_LOCK;	struct devlink *devlink; 	devlink = info->user_ptr[0];	devl_dev_unlock(devlink, dev_lock);	devlink_put(devlink);} void devlink_nl_post_doit(const struct genl_split_ops *ops,			  struct sk_buff *skb, struct genl_info *info){	__devlink_nl_post_doit(skb, info, 0);} voiddevlink_nl_post_doit_dev_lock(const struct genl_split_ops *ops,			      struct sk_buff *skb, struct genl_info *info){	__devlink_nl_post_doit(skb, info, DEVLINK_NL_FLAG_NEED_DEV_LOCK);} static int devlink_nl_inst_single_dumpit(struct sk_buff *msg,					 struct netlink_callback *cb, int flags,					 devlink_nl_dump_one_func_t *dump_one,					 struct nlattr **attrs){	struct devlink *devlink;	int err; 	devlink = devlink_get_from_attrs_lock(sock_net(msg->sk), attrs, false);	if (IS_ERR(devlink))		return PTR_ERR(devlink);	err = dump_one(msg, devlink, cb, flags | NLM_F_DUMP_FILTERED); 	devl_unlock(devlink);	devlink_put(devlink); 	if (err != -EMSGSIZE)		return err;	return msg->len;} static int devlink_nl_inst_iter_dumpit(struct sk_buff *msg,				       struct netlink_callback *cb, int flags,				       devlink_nl_dump_one_func_t *dump_one){	struct devlink_nl_dump_state *state = devlink_dump_state(cb);	struct devlink *devlink;	int err = 0; 	while ((devlink = devlinks_xa_find_get(sock_net(msg->sk),					       &state->instance))) {		devl_lock(devlink); 		if (devl_is_registered(devlink))			err = dump_one(msg, devlink, cb, flags);		else			err = 0; 		devl_unlock(devlink);		devlink_put(devlink); 		if (err)			break; 		state->instance++; 		/* restart sub-object walk for the next instance */		state->idx = 0;	} 	if (err != -EMSGSIZE)		return err;	return msg->len;} int devlink_nl_dumpit(struct sk_buff *msg, struct netlink_callback *cb,		      devlink_nl_dump_one_func_t *dump_one){	const struct genl_info *info = genl_info_dump(cb);	struct nlattr **attrs = info->attrs;	int flags = NLM_F_MULTI; 	if (attrs &&	    (attrs[DEVLINK_ATTR_BUS_NAME] || attrs[DEVLINK_ATTR_DEV_NAME]))		return devlink_nl_inst_single_dumpit(msg, cb, flags, dump_one,						     attrs);	else		return devlink_nl_inst_iter_dumpit(msg, cb, flags, dump_one);} struct genl_family devlink_nl_family __ro_after_init = {	.name		= DEVLINK_GENL_NAME,	.version	= DEVLINK_GENL_VERSION,	.netnsok	= true,	.parallel_ops	= true,	.module		= THIS_MODULE,	.split_ops	= devlink_nl_ops,	.n_split_ops	= ARRAY_SIZE(devlink_nl_ops),	.resv_start_op	= DEVLINK_CMD_SELFTESTS_RUN + 1,	.mcgrps		= devlink_nl_mcgrps,	.n_mcgrps	= ARRAY_SIZE(devlink_nl_mcgrps),	.sock_priv_size		= sizeof(struct devlink_nl_sock_priv),	.sock_priv_init		= devlink_nl_sock_priv_init,	.sock_priv_destroy	= devlink_nl_sock_priv_destroy,};