4 * Phonet netlink interface
6 * Copyright (C) 2008 Nokia Corporation.
8 * Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
9 * Original author: Sakari Ailus <sakari.ailus@nokia.com>
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * version 2 as published by the Free Software Foundation.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
26 #include <linux/kernel.h>
27 #include <linux/netlink.h>
28 #include <linux/phonet.h>
30 #include <net/phonet/pn_dev.h>
32 static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
33 u32 pid, u32 seq, int event);
35 void phonet_address_notify(int event, struct net_device *dev, u8 addr)
40 skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
41 nla_total_size(1), GFP_KERNEL);
44 err = fill_addr(skb, dev, addr, 0, 0, event);
46 WARN_ON(err == -EMSGSIZE);
50 rtnl_notify(skb, dev_net(dev), 0,
51 RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL);
55 rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err);
58 static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = {
59 [IFA_LOCAL] = { .type = NLA_U8 },
62 static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *attr)
64 struct net *net = sock_net(skb->sk);
65 struct nlattr *tb[IFA_MAX+1];
66 struct net_device *dev;
67 struct ifaddrmsg *ifm;
71 if (!net_eq(net, &init_net))
73 if (!capable(CAP_SYS_ADMIN))
78 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_phonet_policy);
82 ifm = nlmsg_data(nlh);
83 if (tb[IFA_LOCAL] == NULL)
85 pnaddr = nla_get_u8(tb[IFA_LOCAL]);
87 /* Phonet addresses only have 6 high-order bits */
90 dev = __dev_get_by_index(net, ifm->ifa_index);
94 if (nlh->nlmsg_type == RTM_NEWADDR)
95 err = phonet_address_add(dev, pnaddr);
97 err = phonet_address_del(dev, pnaddr);
99 phonet_address_notify(nlh->nlmsg_type, dev, pnaddr);
103 static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
104 u32 pid, u32 seq, int event)
106 struct ifaddrmsg *ifm;
107 struct nlmsghdr *nlh;
109 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), 0);
113 ifm = nlmsg_data(nlh);
114 ifm->ifa_family = AF_PHONET;
115 ifm->ifa_prefixlen = 0;
116 ifm->ifa_flags = IFA_F_PERMANENT;
117 ifm->ifa_scope = RT_SCOPE_LINK;
118 ifm->ifa_index = dev->ifindex;
119 NLA_PUT_U8(skb, IFA_LOCAL, addr);
120 return nlmsg_end(skb, nlh);
123 nlmsg_cancel(skb, nlh);
127 static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
129 struct net *net = sock_net(skb->sk);
130 struct phonet_device_list *pndevs;
131 struct phonet_device *pnd;
132 int dev_idx = 0, dev_start_idx = cb->args[0];
133 int addr_idx = 0, addr_start_idx = cb->args[1];
135 if (!net_eq(net, &init_net))
138 pndevs = phonet_device_list(net);
139 spin_lock_bh(&pndevs->lock);
140 list_for_each_entry(pnd, &pndevs->list, list) {
143 if (dev_idx > dev_start_idx)
145 if (dev_idx++ < dev_start_idx)
149 for (addr = find_first_bit(pnd->addrs, 64); addr < 64;
150 addr = find_next_bit(pnd->addrs, 64, 1+addr)) {
151 if (addr_idx++ < addr_start_idx)
154 if (fill_addr(skb, pnd->netdev, addr << 2,
155 NETLINK_CB(cb->skb).pid,
156 cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0)
162 spin_unlock_bh(&pndevs->lock);
164 cb->args[0] = dev_idx;
165 cb->args[1] = addr_idx;
170 int __init phonet_netlink_register(void)
172 int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit, NULL);
176 /* Further __rtnl_register() cannot fail */
177 __rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL);
178 __rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit);