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Remi Denis-Courmont8fb39742008-09-22 20:04:30 -07001/*
2 * File: pn_netlink.c
3 *
4 * Phonet netlink interface
5 *
6 * Copyright (C) 2008 Nokia Corporation.
7 *
Rémi Denis-Courmont31fdc552012-06-13 22:29:03 +00008 * Authors: Sakari Ailus <sakari.ailus@nokia.com>
9 * Remi Denis-Courmont
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070010 *
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.
14 *
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.
19 *
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
23 * 02110-1301 USA
24 */
25
26#include <linux/kernel.h>
27#include <linux/netlink.h>
28#include <linux/phonet.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090029#include <linux/slab.h>
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070030#include <net/sock.h>
31#include <net/phonet/pn_dev.h>
32
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +000033/* Device address handling */
34
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070035static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
Eric W. Biederman15e47302012-09-07 20:12:54 +000036 u32 portid, u32 seq, int event);
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070037
Rémi Denis-Courmontc7a1a4c2009-06-24 01:07:44 +000038void phonet_address_notify(int event, struct net_device *dev, u8 addr)
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070039{
40 struct sk_buff *skb;
41 int err = -ENOBUFS;
42
43 skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
44 nla_total_size(1), GFP_KERNEL);
45 if (skb == NULL)
46 goto errout;
47 err = fill_addr(skb, dev, addr, 0, 0, event);
48 if (err < 0) {
49 WARN_ON(err == -EMSGSIZE);
50 kfree_skb(skb);
51 goto errout;
52 }
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -080053 rtnl_notify(skb, dev_net(dev), 0,
54 RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL);
55 return;
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070056errout:
Rémi Denis-Courmont4b7673a2009-11-02 22:41:28 +000057 rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err);
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070058}
59
Rémi Denis-Courmont89807132008-09-30 02:51:18 -070060static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = {
61 [IFA_LOCAL] = { .type = NLA_U8 },
62};
63
Thomas Graf661d2962013-03-21 07:45:29 +000064static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070065{
Rémi Denis-Courmont89807132008-09-30 02:51:18 -070066 struct net *net = sock_net(skb->sk);
67 struct nlattr *tb[IFA_MAX+1];
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070068 struct net_device *dev;
Rémi Denis-Courmont89807132008-09-30 02:51:18 -070069 struct ifaddrmsg *ifm;
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070070 int err;
71 u8 pnaddr;
72
Eric W. Biederman90f62cf2014-04-23 14:29:27 -070073 if (!netlink_capable(skb, CAP_NET_ADMIN))
Eric W. Biedermandfc47ef2012-11-16 03:03:00 +000074 return -EPERM;
75
Eric W. Biederman90f62cf2014-04-23 14:29:27 -070076 if (!netlink_capable(skb, CAP_SYS_ADMIN))
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070077 return -EPERM;
78
79 ASSERT_RTNL();
80
Rémi Denis-Courmont89807132008-09-30 02:51:18 -070081 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_phonet_policy);
82 if (err < 0)
83 return err;
84
85 ifm = nlmsg_data(nlh);
86 if (tb[IFA_LOCAL] == NULL)
87 return -EINVAL;
88 pnaddr = nla_get_u8(tb[IFA_LOCAL]);
89 if (pnaddr & 3)
90 /* Phonet addresses only have 6 high-order bits */
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070091 return -EINVAL;
92
Rémi Denis-Courmont89807132008-09-30 02:51:18 -070093 dev = __dev_get_by_index(net, ifm->ifa_index);
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070094 if (dev == NULL)
95 return -ENODEV;
96
Rémi Denis-Courmont89807132008-09-30 02:51:18 -070097 if (nlh->nlmsg_type == RTM_NEWADDR)
98 err = phonet_address_add(dev, pnaddr);
99 else
100 err = phonet_address_del(dev, pnaddr);
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700101 if (!err)
Rémi Denis-Courmontc7a1a4c2009-06-24 01:07:44 +0000102 phonet_address_notify(nlh->nlmsg_type, dev, pnaddr);
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700103 return err;
104}
105
106static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
Eric W. Biederman15e47302012-09-07 20:12:54 +0000107 u32 portid, u32 seq, int event)
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700108{
109 struct ifaddrmsg *ifm;
110 struct nlmsghdr *nlh;
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700111
Eric W. Biederman15e47302012-09-07 20:12:54 +0000112 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), 0);
Rémi Denis-Courmont89807132008-09-30 02:51:18 -0700113 if (nlh == NULL)
114 return -EMSGSIZE;
115
116 ifm = nlmsg_data(nlh);
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700117 ifm->ifa_family = AF_PHONET;
118 ifm->ifa_prefixlen = 0;
119 ifm->ifa_flags = IFA_F_PERMANENT;
Rémi Denis-Courmont89807132008-09-30 02:51:18 -0700120 ifm->ifa_scope = RT_SCOPE_LINK;
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700121 ifm->ifa_index = dev->ifindex;
David S. Miller7f116b52012-03-29 23:15:10 -0400122 if (nla_put_u8(skb, IFA_LOCAL, addr))
123 goto nla_put_failure;
Rémi Denis-Courmont89807132008-09-30 02:51:18 -0700124 return nlmsg_end(skb, nlh);
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700125
Rémi Denis-Courmont89807132008-09-30 02:51:18 -0700126nla_put_failure:
127 nlmsg_cancel(skb, nlh);
128 return -EMSGSIZE;
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700129}
130
131static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
132{
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000133 struct phonet_device_list *pndevs;
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700134 struct phonet_device *pnd;
135 int dev_idx = 0, dev_start_idx = cb->args[0];
136 int addr_idx = 0, addr_start_idx = cb->args[1];
137
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000138 pndevs = phonet_device_list(sock_net(skb->sk));
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -0800139 rcu_read_lock();
140 list_for_each_entry_rcu(pnd, &pndevs->list, list) {
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700141 u8 addr;
142
143 if (dev_idx > dev_start_idx)
144 addr_start_idx = 0;
145 if (dev_idx++ < dev_start_idx)
146 continue;
147
148 addr_idx = 0;
Akinobu Mitaa1ca14a2010-03-11 12:07:49 +0000149 for_each_set_bit(addr, pnd->addrs, 64) {
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700150 if (addr_idx++ < addr_start_idx)
151 continue;
152
153 if (fill_addr(skb, pnd->netdev, addr << 2,
Eric W. Biederman15e47302012-09-07 20:12:54 +0000154 NETLINK_CB(cb->skb).portid,
Rémi Denis-Courmont998ec752009-09-08 23:59:51 +0000155 cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0)
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700156 goto out;
157 }
158 }
159
160out:
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -0800161 rcu_read_unlock();
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700162 cb->args[0] = dev_idx;
163 cb->args[1] = addr_idx;
164
165 return skb->len;
166}
167
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000168/* Routes handling */
169
170static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst,
Eric W. Biederman15e47302012-09-07 20:12:54 +0000171 u32 portid, u32 seq, int event)
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000172{
173 struct rtmsg *rtm;
174 struct nlmsghdr *nlh;
175
Eric W. Biederman15e47302012-09-07 20:12:54 +0000176 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), 0);
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000177 if (nlh == NULL)
178 return -EMSGSIZE;
179
180 rtm = nlmsg_data(nlh);
181 rtm->rtm_family = AF_PHONET;
182 rtm->rtm_dst_len = 6;
183 rtm->rtm_src_len = 0;
184 rtm->rtm_tos = 0;
185 rtm->rtm_table = RT_TABLE_MAIN;
186 rtm->rtm_protocol = RTPROT_STATIC;
187 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
188 rtm->rtm_type = RTN_UNICAST;
189 rtm->rtm_flags = 0;
David S. Miller7f116b52012-03-29 23:15:10 -0400190 if (nla_put_u8(skb, RTA_DST, dst) ||
191 nla_put_u32(skb, RTA_OIF, dev->ifindex))
192 goto nla_put_failure;
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000193 return nlmsg_end(skb, nlh);
194
195nla_put_failure:
196 nlmsg_cancel(skb, nlh);
197 return -EMSGSIZE;
198}
199
200void rtm_phonet_notify(int event, struct net_device *dev, u8 dst)
201{
202 struct sk_buff *skb;
203 int err = -ENOBUFS;
204
205 skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
206 nla_total_size(1) + nla_total_size(4), GFP_KERNEL);
207 if (skb == NULL)
208 goto errout;
209 err = fill_route(skb, dev, dst, 0, 0, event);
210 if (err < 0) {
211 WARN_ON(err == -EMSGSIZE);
212 kfree_skb(skb);
213 goto errout;
214 }
215 rtnl_notify(skb, dev_net(dev), 0,
216 RTNLGRP_PHONET_ROUTE, NULL, GFP_KERNEL);
217 return;
218errout:
Rémi Denis-Courmont4b7673a2009-11-02 22:41:28 +0000219 rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_ROUTE, err);
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000220}
221
222static const struct nla_policy rtm_phonet_policy[RTA_MAX+1] = {
223 [RTA_DST] = { .type = NLA_U8 },
224 [RTA_OIF] = { .type = NLA_U32 },
225};
226
Thomas Graf661d2962013-03-21 07:45:29 +0000227static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000228{
229 struct net *net = sock_net(skb->sk);
230 struct nlattr *tb[RTA_MAX+1];
231 struct net_device *dev;
232 struct rtmsg *rtm;
233 int err;
234 u8 dst;
235
Eric W. Biederman90f62cf2014-04-23 14:29:27 -0700236 if (!netlink_capable(skb, CAP_NET_ADMIN))
Eric W. Biedermandfc47ef2012-11-16 03:03:00 +0000237 return -EPERM;
238
Eric W. Biederman90f62cf2014-04-23 14:29:27 -0700239 if (!netlink_capable(skb, CAP_SYS_ADMIN))
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000240 return -EPERM;
241
242 ASSERT_RTNL();
243
244 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_phonet_policy);
245 if (err < 0)
246 return err;
247
248 rtm = nlmsg_data(nlh);
249 if (rtm->rtm_table != RT_TABLE_MAIN || rtm->rtm_type != RTN_UNICAST)
250 return -EINVAL;
251 if (tb[RTA_DST] == NULL || tb[RTA_OIF] == NULL)
252 return -EINVAL;
253 dst = nla_get_u8(tb[RTA_DST]);
254 if (dst & 3) /* Phonet addresses only have 6 high-order bits */
255 return -EINVAL;
256
257 dev = __dev_get_by_index(net, nla_get_u32(tb[RTA_OIF]));
258 if (dev == NULL)
259 return -ENODEV;
260
261 if (nlh->nlmsg_type == RTM_NEWROUTE)
262 err = phonet_route_add(dev, dst);
263 else
264 err = phonet_route_del(dev, dst);
265 if (!err)
266 rtm_phonet_notify(nlh->nlmsg_type, dev, dst);
267 return err;
268}
269
270static int route_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
271{
272 struct net *net = sock_net(skb->sk);
273 u8 addr, addr_idx = 0, addr_start_idx = cb->args[0];
274
Eric Dumazete67f88d2011-04-27 22:56:07 +0000275 rcu_read_lock();
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000276 for (addr = 0; addr < 64; addr++) {
277 struct net_device *dev;
278
Eric Dumazete67f88d2011-04-27 22:56:07 +0000279 dev = phonet_route_get_rcu(net, addr << 2);
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000280 if (!dev)
281 continue;
282
283 if (addr_idx++ < addr_start_idx)
284 continue;
Eric W. Biederman15e47302012-09-07 20:12:54 +0000285 if (fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).portid,
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000286 cb->nlh->nlmsg_seq, RTM_NEWROUTE))
287 goto out;
288 }
289
290out:
Eric Dumazete67f88d2011-04-27 22:56:07 +0000291 rcu_read_unlock();
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000292 cb->args[0] = addr_idx;
293 cb->args[1] = 0;
294
295 return skb->len;
296}
297
remi.denis-courmont@nokia660f7062009-01-23 03:00:28 +0000298int __init phonet_netlink_register(void)
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700299{
Greg Rosec7ac8672011-06-10 01:27:09 +0000300 int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit,
301 NULL, NULL);
remi.denis-courmont@nokia660f7062009-01-23 03:00:28 +0000302 if (err)
303 return err;
304
305 /* Further __rtnl_register() cannot fail */
Greg Rosec7ac8672011-06-10 01:27:09 +0000306 __rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL, NULL);
307 __rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit, NULL);
308 __rtnl_register(PF_PHONET, RTM_NEWROUTE, route_doit, NULL, NULL);
309 __rtnl_register(PF_PHONET, RTM_DELROUTE, route_doit, NULL, NULL);
310 __rtnl_register(PF_PHONET, RTM_GETROUTE, NULL, route_dumpit, NULL);
remi.denis-courmont@nokia660f7062009-01-23 03:00:28 +0000311 return 0;
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700312}