net/phonet/pn_netlink.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * File: pn_netlink.c
  *
  * Phonet netlink interface
  *
  * Copyright (C) 2008 Nokia Corporation.
  *
  * Authors: Sakari Ailus <sakari.ailus@nokia.com>
  *          Remi Denis-Courmont
  */

 #include <linux/kernel.h>
 #include <linux/netlink.h>
 #include <linux/phonet.h>
 #include <linux/slab.h>
 #include <net/sock.h>
 #include <net/phonet/pn_dev.h>

 /* Device address handling */

 static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
 		     u32 portid, u32 seq, int event);

 void phonet_address_notify(int event, struct net_device *dev, u8 addr)
 {
 	struct sk_buff *skb;
 	int err = -ENOBUFS;

 	skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
 			nla_total_size(1), GFP_KERNEL);
 	if (skb == NULL)
 		goto errout;
 	err = fill_addr(skb, dev, addr, 0, 0, event);
 	if (err < 0) {
 		WARN_ON(err == -EMSGSIZE);
 		kfree_skb(skb);
 		goto errout;
 	}
 	rtnl_notify(skb, dev_net(dev), 0,
 		    RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL);
 	return;
 errout:
 	rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err);
 }

 static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = {
 	[IFA_LOCAL] = { .type = NLA_U8 },
 };

 static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
 		     struct netlink_ext_ack *extack)
 {
 	struct net *net = sock_net(skb->sk);
 	struct nlattr *tb[IFA_MAX+1];
 	struct net_device *dev;
 	struct ifaddrmsg *ifm;
 	int err;
 	u8 pnaddr;

 	if (!netlink_capable(skb, CAP_NET_ADMIN))
 		return -EPERM;

 	if (!netlink_capable(skb, CAP_SYS_ADMIN))
 		return -EPERM;

 	ASSERT_RTNL();

 	err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
 				     ifa_phonet_policy, extack);
 	if (err < 0)
 		return err;

 	ifm = nlmsg_data(nlh);
 	if (tb[IFA_LOCAL] == NULL)
 		return -EINVAL;
 	pnaddr = nla_get_u8(tb[IFA_LOCAL]);
 	if (pnaddr & 3)
 		/* Phonet addresses only have 6 high-order bits */
 		return -EINVAL;

 	dev = __dev_get_by_index(net, ifm->ifa_index);
 	if (dev == NULL)
 		return -ENODEV;

 	if (nlh->nlmsg_type == RTM_NEWADDR)
 		err = phonet_address_add(dev, pnaddr);
 	else
 		err = phonet_address_del(dev, pnaddr);
 	if (!err)
 		phonet_address_notify(nlh->nlmsg_type, dev, pnaddr);
 	return err;
 }

 static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
 			u32 portid, u32 seq, int event)
 {
 	struct ifaddrmsg *ifm;
 	struct nlmsghdr *nlh;

 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), 0);
 	if (nlh == NULL)
 		return -EMSGSIZE;

 	ifm = nlmsg_data(nlh);
 	ifm->ifa_family = AF_PHONET;
 	ifm->ifa_prefixlen = 0;
 	ifm->ifa_flags = IFA_F_PERMANENT;
 	ifm->ifa_scope = RT_SCOPE_LINK;
 	ifm->ifa_index = dev->ifindex;
 	if (nla_put_u8(skb, IFA_LOCAL, addr))
 		goto nla_put_failure;
 	nlmsg_end(skb, nlh);
 	return 0;

 nla_put_failure:
 	nlmsg_cancel(skb, nlh);
 	return -EMSGSIZE;
 }

 static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
 {
 	struct phonet_device_list *pndevs;
 	struct phonet_device *pnd;
 	int dev_idx = 0, dev_start_idx = cb->args[0];
 	int addr_idx = 0, addr_start_idx = cb->args[1];

 	pndevs = phonet_device_list(sock_net(skb->sk));
 	rcu_read_lock();
 	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
 		u8 addr;

 		if (dev_idx > dev_start_idx)
 			addr_start_idx = 0;
 		if (dev_idx++ < dev_start_idx)
 			continue;

 		addr_idx = 0;
 		for_each_set_bit(addr, pnd->addrs, 64) {
 			if (addr_idx++ < addr_start_idx)
 				continue;

 			if (fill_addr(skb, pnd->netdev, addr << 2,
 					 NETLINK_CB(cb->skb).portid,
 					cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0)
 				goto out;
 		}
 	}

 out:
 	rcu_read_unlock();
 	cb->args[0] = dev_idx;
 	cb->args[1] = addr_idx;

 	return skb->len;
 }

 /* Routes handling */

 static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst,
 			u32 portid, u32 seq, int event)
 {
 	struct rtmsg *rtm;
 	struct nlmsghdr *nlh;

 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), 0);
 	if (nlh == NULL)
 		return -EMSGSIZE;

 	rtm = nlmsg_data(nlh);
 	rtm->rtm_family = AF_PHONET;
 	rtm->rtm_dst_len = 6;
 	rtm->rtm_src_len = 0;
 	rtm->rtm_tos = 0;
 	rtm->rtm_table = RT_TABLE_MAIN;
 	rtm->rtm_protocol = RTPROT_STATIC;
 	rtm->rtm_scope = RT_SCOPE_UNIVERSE;
 	rtm->rtm_type = RTN_UNICAST;
 	rtm->rtm_flags = 0;
 	if (nla_put_u8(skb, RTA_DST, dst) ||
 	    nla_put_u32(skb, RTA_OIF, READ_ONCE(dev->ifindex)))
 		goto nla_put_failure;
 	nlmsg_end(skb, nlh);
 	return 0;

 nla_put_failure:
 	nlmsg_cancel(skb, nlh);
 	return -EMSGSIZE;
 }

 void rtm_phonet_notify(int event, struct net_device *dev, u8 dst)
 {
 	struct sk_buff *skb;
 	int err = -ENOBUFS;

 	skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct rtmsg)) +
 			nla_total_size(1) + nla_total_size(4), GFP_KERNEL);
 	if (skb == NULL)
 		goto errout;
 	err = fill_route(skb, dev, dst, 0, 0, event);
 	if (err < 0) {
 		WARN_ON(err == -EMSGSIZE);
 		kfree_skb(skb);
 		goto errout;
 	}
 	rtnl_notify(skb, dev_net(dev), 0,
 			  RTNLGRP_PHONET_ROUTE, NULL, GFP_KERNEL);
 	return;
 errout:
 	rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_ROUTE, err);
 }

 static const struct nla_policy rtm_phonet_policy[RTA_MAX+1] = {
 	[RTA_DST] = { .type = NLA_U8 },
 	[RTA_OIF] = { .type = NLA_U32 },
 };

 static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
 		      struct netlink_ext_ack *extack)
 {
 	struct net *net = sock_net(skb->sk);
 	struct nlattr *tb[RTA_MAX+1];
 	struct net_device *dev;
 	struct rtmsg *rtm;
 	int err;
 	u8 dst;

 	if (!netlink_capable(skb, CAP_NET_ADMIN))
 		return -EPERM;

 	if (!netlink_capable(skb, CAP_SYS_ADMIN))
 		return -EPERM;

 	ASSERT_RTNL();

 	err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
 				     rtm_phonet_policy, extack);
 	if (err < 0)
 		return err;

 	rtm = nlmsg_data(nlh);
 	if (rtm->rtm_table != RT_TABLE_MAIN || rtm->rtm_type != RTN_UNICAST)
 		return -EINVAL;
 	if (tb[RTA_DST] == NULL || tb[RTA_OIF] == NULL)
 		return -EINVAL;
 	dst = nla_get_u8(tb[RTA_DST]);
 	if (dst & 3) /* Phonet addresses only have 6 high-order bits */
 		return -EINVAL;

 	dev = __dev_get_by_index(net, nla_get_u32(tb[RTA_OIF]));
 	if (dev == NULL)
 		return -ENODEV;

 	if (nlh->nlmsg_type == RTM_NEWROUTE)
 		err = phonet_route_add(dev, dst);
 	else
 		err = phonet_route_del(dev, dst);
 	if (!err)
 		rtm_phonet_notify(nlh->nlmsg_type, dev, dst);
 	return err;
 }

 static int route_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
 {
 	struct net *net = sock_net(skb->sk);
 	int err = 0;
 	u8 addr;

 	rcu_read_lock();
 	for (addr = cb->args[0]; addr < 64; addr++) {
 		struct net_device *dev = phonet_route_get_rcu(net, addr << 2);

 		if (!dev)
 			continue;

 		err = fill_route(skb, dev, addr << 2,
 				 NETLINK_CB(cb->skb).portid,
 				 cb->nlh->nlmsg_seq, RTM_NEWROUTE);
 		if (err < 0)
 			break;
 	}
 	rcu_read_unlock();
 	cb->args[0] = addr;

 	return err;
 }

 static const struct rtnl_msg_handler phonet_rtnl_msg_handlers[] __initdata_or_module = {
 	{THIS_MODULE, PF_PHONET, RTM_NEWADDR, addr_doit, NULL, 0},
 	{THIS_MODULE, PF_PHONET, RTM_DELADDR, addr_doit, NULL, 0},
 	{THIS_MODULE, PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit, 0},
 	{THIS_MODULE, PF_PHONET, RTM_NEWROUTE, route_doit, NULL, 0},
 	{THIS_MODULE, PF_PHONET, RTM_DELROUTE, route_doit, NULL, 0},
 	{THIS_MODULE, PF_PHONET, RTM_GETROUTE, NULL, route_dumpit,
 	 RTNL_FLAG_DUMP_UNLOCKED},
 };

 int __init phonet_netlink_register(void)
 {
 	return rtnl_register_many(phonet_rtnl_msg_handlers);
 }
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* File: pn_netlink.c
	*
	* Phonet netlink interface
	*
	* Copyright (C) 2008 Nokia Corporation.
	*
	* Authors: Sakari Ailus <sakari.ailus@nokia.com>
	* Remi Denis-Courmont
	*/

	#include <linux/kernel.h>
	#include <linux/netlink.h>
	#include <linux/phonet.h>
	#include <linux/slab.h>
	#include <net/sock.h>
	#include <net/phonet/pn_dev.h>

	/* Device address handling */

	static int fill_addr(struct sk_buff skb, struct net_device dev, u8 addr,
	u32 portid, u32 seq, int event);

	void phonet_address_notify(int event, struct net_device *dev, u8 addr)
	{
	struct sk_buff *skb;
	int err = -ENOBUFS;

	skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
	nla_total_size(1), GFP_KERNEL);
	if (skb == NULL)
	goto errout;
	err = fill_addr(skb, dev, addr, 0, 0, event);
	if (err < 0) {
	WARN_ON(err == -EMSGSIZE);
	kfree_skb(skb);
	goto errout;
	}
	rtnl_notify(skb, dev_net(dev), 0,
	RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL);
	return;
	errout:
	rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err);
	}

	static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = {
	[IFA_LOCAL] = { .type = NLA_U8 },
	};

	static int addr_doit(struct sk_buff skb, struct nlmsghdr nlh,
	struct netlink_ext_ack *extack)
	{
	struct net *net = sock_net(skb->sk);
	struct nlattr *tb[IFA_MAX+1];
	struct net_device *dev;
	struct ifaddrmsg *ifm;
	int err;
	u8 pnaddr;

	if (!netlink_capable(skb, CAP_NET_ADMIN))
	return -EPERM;

	if (!netlink_capable(skb, CAP_SYS_ADMIN))
	return -EPERM;

	ASSERT_RTNL();

	err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
	ifa_phonet_policy, extack);
	if (err < 0)
	return err;

	ifm = nlmsg_data(nlh);
	if (tb[IFA_LOCAL] == NULL)
	return -EINVAL;
	pnaddr = nla_get_u8(tb[IFA_LOCAL]);
	if (pnaddr & 3)
	/* Phonet addresses only have 6 high-order bits */
	return -EINVAL;

	dev = __dev_get_by_index(net, ifm->ifa_index);
	if (dev == NULL)
	return -ENODEV;

	if (nlh->nlmsg_type == RTM_NEWADDR)
	err = phonet_address_add(dev, pnaddr);
	else
	err = phonet_address_del(dev, pnaddr);
	if (!err)
	phonet_address_notify(nlh->nlmsg_type, dev, pnaddr);
	return err;
	}

	static int fill_addr(struct sk_buff skb, struct net_device dev, u8 addr,
	u32 portid, u32 seq, int event)
	{
	struct ifaddrmsg *ifm;
	struct nlmsghdr *nlh;

	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), 0);
	if (nlh == NULL)
	return -EMSGSIZE;

	ifm = nlmsg_data(nlh);
	ifm->ifa_family = AF_PHONET;
	ifm->ifa_prefixlen = 0;
	ifm->ifa_flags = IFA_F_PERMANENT;
	ifm->ifa_scope = RT_SCOPE_LINK;
	ifm->ifa_index = dev->ifindex;
	if (nla_put_u8(skb, IFA_LOCAL, addr))
	goto nla_put_failure;
	nlmsg_end(skb, nlh);
	return 0;

	nla_put_failure:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
	}

	static int getaddr_dumpit(struct sk_buff skb, struct netlink_callback cb)
	{
	struct phonet_device_list *pndevs;
	struct phonet_device *pnd;
	int dev_idx = 0, dev_start_idx = cb->args[0];
	int addr_idx = 0, addr_start_idx = cb->args[1];

	pndevs = phonet_device_list(sock_net(skb->sk));
	rcu_read_lock();
	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
	u8 addr;

	if (dev_idx > dev_start_idx)
	addr_start_idx = 0;
	if (dev_idx++ < dev_start_idx)
	continue;

	addr_idx = 0;
	for_each_set_bit(addr, pnd->addrs, 64) {
	if (addr_idx++ < addr_start_idx)
	continue;

	if (fill_addr(skb, pnd->netdev, addr << 2,
	NETLINK_CB(cb->skb).portid,
	cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0)
	goto out;
	}
	}

	out:
	rcu_read_unlock();
	cb->args[0] = dev_idx;
	cb->args[1] = addr_idx;

	return skb->len;
	}

	/* Routes handling */

	static int fill_route(struct sk_buff skb, struct net_device dev, u8 dst,
	u32 portid, u32 seq, int event)
	{
	struct rtmsg *rtm;
	struct nlmsghdr *nlh;

	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), 0);
	if (nlh == NULL)
	return -EMSGSIZE;

	rtm = nlmsg_data(nlh);
	rtm->rtm_family = AF_PHONET;
	rtm->rtm_dst_len = 6;
	rtm->rtm_src_len = 0;
	rtm->rtm_tos = 0;
	rtm->rtm_table = RT_TABLE_MAIN;
	rtm->rtm_protocol = RTPROT_STATIC;
	rtm->rtm_scope = RT_SCOPE_UNIVERSE;
	rtm->rtm_type = RTN_UNICAST;
	rtm->rtm_flags = 0;
	if (nla_put_u8(skb, RTA_DST, dst) \|\|
	nla_put_u32(skb, RTA_OIF, READ_ONCE(dev->ifindex)))
	goto nla_put_failure;
	nlmsg_end(skb, nlh);
	return 0;

	nla_put_failure:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
	}

	void rtm_phonet_notify(int event, struct net_device *dev, u8 dst)
	{
	struct sk_buff *skb;
	int err = -ENOBUFS;

	skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct rtmsg)) +
	nla_total_size(1) + nla_total_size(4), GFP_KERNEL);
	if (skb == NULL)
	goto errout;
	err = fill_route(skb, dev, dst, 0, 0, event);
	if (err < 0) {
	WARN_ON(err == -EMSGSIZE);
	kfree_skb(skb);
	goto errout;
	}
	rtnl_notify(skb, dev_net(dev), 0,
	RTNLGRP_PHONET_ROUTE, NULL, GFP_KERNEL);
	return;
	errout:
	rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_ROUTE, err);
	}

	static const struct nla_policy rtm_phonet_policy[RTA_MAX+1] = {
	[RTA_DST] = { .type = NLA_U8 },
	[RTA_OIF] = { .type = NLA_U32 },
	};

	static int route_doit(struct sk_buff skb, struct nlmsghdr nlh,
	struct netlink_ext_ack *extack)
	{
	struct net *net = sock_net(skb->sk);
	struct nlattr *tb[RTA_MAX+1];
	struct net_device *dev;
	struct rtmsg *rtm;
	int err;
	u8 dst;

	if (!netlink_capable(skb, CAP_NET_ADMIN))
	return -EPERM;

	if (!netlink_capable(skb, CAP_SYS_ADMIN))
	return -EPERM;

	ASSERT_RTNL();

	err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
	rtm_phonet_policy, extack);
	if (err < 0)
	return err;

	rtm = nlmsg_data(nlh);
	if (rtm->rtm_table != RT_TABLE_MAIN \|\| rtm->rtm_type != RTN_UNICAST)
	return -EINVAL;
	if (tb[RTA_DST] == NULL \|\| tb[RTA_OIF] == NULL)
	return -EINVAL;
	dst = nla_get_u8(tb[RTA_DST]);
	if (dst & 3) /* Phonet addresses only have 6 high-order bits */
	return -EINVAL;

	dev = __dev_get_by_index(net, nla_get_u32(tb[RTA_OIF]));
	if (dev == NULL)
	return -ENODEV;

	if (nlh->nlmsg_type == RTM_NEWROUTE)
	err = phonet_route_add(dev, dst);
	else
	err = phonet_route_del(dev, dst);
	if (!err)
	rtm_phonet_notify(nlh->nlmsg_type, dev, dst);
	return err;
	}

	static int route_dumpit(struct sk_buff skb, struct netlink_callback cb)
	{
	struct net *net = sock_net(skb->sk);
	int err = 0;
	u8 addr;

	rcu_read_lock();
	for (addr = cb->args[0]; addr < 64; addr++) {
	struct net_device *dev = phonet_route_get_rcu(net, addr << 2);

	if (!dev)
	continue;

	err = fill_route(skb, dev, addr << 2,
	NETLINK_CB(cb->skb).portid,
	cb->nlh->nlmsg_seq, RTM_NEWROUTE);
	if (err < 0)
	break;
	}
	rcu_read_unlock();
	cb->args[0] = addr;

	return err;
	}

	static const struct rtnl_msg_handler phonet_rtnl_msg_handlers[] __initdata_or_module = {
	{THIS_MODULE, PF_PHONET, RTM_NEWADDR, addr_doit, NULL, 0},
	{THIS_MODULE, PF_PHONET, RTM_DELADDR, addr_doit, NULL, 0},
	{THIS_MODULE, PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit, 0},
	{THIS_MODULE, PF_PHONET, RTM_NEWROUTE, route_doit, NULL, 0},
	{THIS_MODULE, PF_PHONET, RTM_DELROUTE, route_doit, NULL, 0},
	{THIS_MODULE, PF_PHONET, RTM_GETROUTE, NULL, route_dumpit,
	RTNL_FLAG_DUMP_UNLOCKED},
	};

	int __init phonet_netlink_register(void)
	{
	return rtnl_register_many(phonet_rtnl_msg_handlers);
	}