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/*
* File: pn_netlink.c
*
* Phonet netlink interface
*
* Copyright (C) 2008 Nokia Corporation.
*
* Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
* Original author: Sakari Ailus <sakari.ailus@nokia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <linux/kernel.h>
#include <linux/netlink.h>
#include <linux/phonet.h>
#include <net/sock.h>
#include <net/phonet/pn_dev.h>
static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
u32 pid, u32 seq, int event);
static void rtmsg_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;
}
err = rtnl_notify(skb, dev_net(dev), 0,
RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL);
errout:
if (err < 0)
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, void *attr)
{
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 (!capable(CAP_SYS_ADMIN))
return -EPERM;
ASSERT_RTNL();
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_phonet_policy);
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)
rtmsg_notify(nlh->nlmsg_type, dev, pnaddr);
return err;
}
static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
u32 pid, u32 seq, int event)
{
struct ifaddrmsg *ifm;
struct nlmsghdr *nlh;
nlh = nlmsg_put(skb, pid, 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;
NLA_PUT_U8(skb, IFA_LOCAL, addr);
return nlmsg_end(skb, nlh);
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
struct phonet_device *pnd;
int dev_idx = 0, dev_start_idx = cb->args[0];
int addr_idx = 0, addr_start_idx = cb->args[1];
spin_lock_bh(&pndevs.lock);
list_for_each_entry(pnd, &pndevs.list, list) {
u8 addr;
if (!net_eq(dev_net(pnd->netdev), net))
continue;
if (dev_idx > dev_start_idx)
addr_start_idx = 0;
if (dev_idx++ < dev_start_idx)
continue;
addr_idx = 0;
for (addr = find_first_bit(pnd->addrs, 64); addr < 64;
addr = find_next_bit(pnd->addrs, 64, 1+addr)) {
if (addr_idx++ < addr_start_idx)
continue;
if (fill_addr(skb, pnd->netdev, addr << 2,
NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, RTM_NEWADDR))
goto out;
}
}
out:
spin_unlock_bh(&pndevs.lock);
cb->args[0] = dev_idx;
cb->args[1] = addr_idx;
return skb->len;
}
int __init phonet_netlink_register(void)
{
int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit, NULL);
if (err)
return err;
/* Further __rtnl_register() cannot fail */
__rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL);
__rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit);
return 0;
}
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