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998ec759ef
Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
174 lines
4.3 KiB
C
174 lines
4.3 KiB
C
/*
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* File: pn_netlink.c
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*
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* Phonet netlink interface
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*
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* Copyright (C) 2008 Nokia Corporation.
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*
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* Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
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* Original author: Sakari Ailus <sakari.ailus@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <linux/kernel.h>
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#include <linux/netlink.h>
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#include <linux/phonet.h>
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#include <net/sock.h>
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#include <net/phonet/pn_dev.h>
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static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
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u32 pid, u32 seq, int event);
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void phonet_address_notify(int event, struct net_device *dev, u8 addr)
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{
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struct sk_buff *skb;
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int err = -ENOBUFS;
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skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
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nla_total_size(1), GFP_KERNEL);
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if (skb == NULL)
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goto errout;
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err = fill_addr(skb, dev, addr, 0, 0, event);
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if (err < 0) {
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WARN_ON(err == -EMSGSIZE);
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kfree_skb(skb);
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goto errout;
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}
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rtnl_notify(skb, dev_net(dev), 0,
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RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL);
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return;
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errout:
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if (err < 0)
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rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err);
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}
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static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = {
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[IFA_LOCAL] = { .type = NLA_U8 },
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};
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static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *attr)
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{
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struct net *net = sock_net(skb->sk);
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struct nlattr *tb[IFA_MAX+1];
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struct net_device *dev;
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struct ifaddrmsg *ifm;
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int err;
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u8 pnaddr;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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ASSERT_RTNL();
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err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_phonet_policy);
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if (err < 0)
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return err;
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ifm = nlmsg_data(nlh);
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if (tb[IFA_LOCAL] == NULL)
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return -EINVAL;
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pnaddr = nla_get_u8(tb[IFA_LOCAL]);
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if (pnaddr & 3)
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/* Phonet addresses only have 6 high-order bits */
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return -EINVAL;
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dev = __dev_get_by_index(net, ifm->ifa_index);
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if (dev == NULL)
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return -ENODEV;
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if (nlh->nlmsg_type == RTM_NEWADDR)
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err = phonet_address_add(dev, pnaddr);
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else
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err = phonet_address_del(dev, pnaddr);
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if (!err)
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phonet_address_notify(nlh->nlmsg_type, dev, pnaddr);
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return err;
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}
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static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
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u32 pid, u32 seq, int event)
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{
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struct ifaddrmsg *ifm;
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struct nlmsghdr *nlh;
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nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), 0);
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if (nlh == NULL)
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return -EMSGSIZE;
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ifm = nlmsg_data(nlh);
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ifm->ifa_family = AF_PHONET;
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ifm->ifa_prefixlen = 0;
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ifm->ifa_flags = IFA_F_PERMANENT;
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ifm->ifa_scope = RT_SCOPE_LINK;
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ifm->ifa_index = dev->ifindex;
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NLA_PUT_U8(skb, IFA_LOCAL, addr);
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return nlmsg_end(skb, nlh);
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nla_put_failure:
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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}
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static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct phonet_device_list *pndevs;
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struct phonet_device *pnd;
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int dev_idx = 0, dev_start_idx = cb->args[0];
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int addr_idx = 0, addr_start_idx = cb->args[1];
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pndevs = phonet_device_list(sock_net(skb->sk));
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spin_lock_bh(&pndevs->lock);
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list_for_each_entry(pnd, &pndevs->list, list) {
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u8 addr;
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if (dev_idx > dev_start_idx)
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addr_start_idx = 0;
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if (dev_idx++ < dev_start_idx)
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continue;
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addr_idx = 0;
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for (addr = find_first_bit(pnd->addrs, 64); addr < 64;
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addr = find_next_bit(pnd->addrs, 64, 1+addr)) {
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if (addr_idx++ < addr_start_idx)
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continue;
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if (fill_addr(skb, pnd->netdev, addr << 2,
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NETLINK_CB(cb->skb).pid,
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cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0)
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goto out;
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}
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}
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out:
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spin_unlock_bh(&pndevs->lock);
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cb->args[0] = dev_idx;
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cb->args[1] = addr_idx;
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return skb->len;
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}
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int __init phonet_netlink_register(void)
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{
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int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit, NULL);
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if (err)
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return err;
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/* Further __rtnl_register() cannot fail */
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__rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL);
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__rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit);
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return 0;
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}
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