blob: 2e6c7eb8e76add27fabc042825e8bda8f9886d06 [file] [log] [blame]
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 *
8 * Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
9 * Original author: Sakari Ailus <sakari.ailus@nokia.com>
10 *
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>
29#include <net/sock.h>
30#include <net/phonet/pn_dev.h>
31
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +000032/* Device address handling */
33
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070034static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
35 u32 pid, u32 seq, int event);
36
Rémi Denis-Courmontc7a1a4c2009-06-24 01:07:44 +000037void phonet_address_notify(int event, struct net_device *dev, u8 addr)
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070038{
39 struct sk_buff *skb;
40 int err = -ENOBUFS;
41
42 skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
43 nla_total_size(1), GFP_KERNEL);
44 if (skb == NULL)
45 goto errout;
46 err = fill_addr(skb, dev, addr, 0, 0, event);
47 if (err < 0) {
48 WARN_ON(err == -EMSGSIZE);
49 kfree_skb(skb);
50 goto errout;
51 }
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -080052 rtnl_notify(skb, dev_net(dev), 0,
53 RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL);
54 return;
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070055errout:
Rémi Denis-Courmont4b7673a2009-11-02 22:41:28 +000056 rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err);
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070057}
58
Rémi Denis-Courmont89807132008-09-30 02:51:18 -070059static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = {
60 [IFA_LOCAL] = { .type = NLA_U8 },
61};
62
63static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *attr)
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070064{
Rémi Denis-Courmont89807132008-09-30 02:51:18 -070065 struct net *net = sock_net(skb->sk);
66 struct nlattr *tb[IFA_MAX+1];
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070067 struct net_device *dev;
Rémi Denis-Courmont89807132008-09-30 02:51:18 -070068 struct ifaddrmsg *ifm;
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070069 int err;
70 u8 pnaddr;
71
72 if (!capable(CAP_SYS_ADMIN))
73 return -EPERM;
74
75 ASSERT_RTNL();
76
Rémi Denis-Courmont89807132008-09-30 02:51:18 -070077 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_phonet_policy);
78 if (err < 0)
79 return err;
80
81 ifm = nlmsg_data(nlh);
82 if (tb[IFA_LOCAL] == NULL)
83 return -EINVAL;
84 pnaddr = nla_get_u8(tb[IFA_LOCAL]);
85 if (pnaddr & 3)
86 /* Phonet addresses only have 6 high-order bits */
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070087 return -EINVAL;
88
Rémi Denis-Courmont89807132008-09-30 02:51:18 -070089 dev = __dev_get_by_index(net, ifm->ifa_index);
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070090 if (dev == NULL)
91 return -ENODEV;
92
Rémi Denis-Courmont89807132008-09-30 02:51:18 -070093 if (nlh->nlmsg_type == RTM_NEWADDR)
94 err = phonet_address_add(dev, pnaddr);
95 else
96 err = phonet_address_del(dev, pnaddr);
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070097 if (!err)
Rémi Denis-Courmontc7a1a4c2009-06-24 01:07:44 +000098 phonet_address_notify(nlh->nlmsg_type, dev, pnaddr);
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -070099 return err;
100}
101
102static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
103 u32 pid, u32 seq, int event)
104{
105 struct ifaddrmsg *ifm;
106 struct nlmsghdr *nlh;
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700107
Rémi Denis-Courmont89807132008-09-30 02:51:18 -0700108 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), 0);
109 if (nlh == NULL)
110 return -EMSGSIZE;
111
112 ifm = nlmsg_data(nlh);
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700113 ifm->ifa_family = AF_PHONET;
114 ifm->ifa_prefixlen = 0;
115 ifm->ifa_flags = IFA_F_PERMANENT;
Rémi Denis-Courmont89807132008-09-30 02:51:18 -0700116 ifm->ifa_scope = RT_SCOPE_LINK;
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700117 ifm->ifa_index = dev->ifindex;
Rémi Denis-Courmont89807132008-09-30 02:51:18 -0700118 NLA_PUT_U8(skb, IFA_LOCAL, addr);
119 return nlmsg_end(skb, nlh);
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700120
Rémi Denis-Courmont89807132008-09-30 02:51:18 -0700121nla_put_failure:
122 nlmsg_cancel(skb, nlh);
123 return -EMSGSIZE;
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700124}
125
126static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
127{
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000128 struct phonet_device_list *pndevs;
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700129 struct phonet_device *pnd;
130 int dev_idx = 0, dev_start_idx = cb->args[0];
131 int addr_idx = 0, addr_start_idx = cb->args[1];
132
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000133 pndevs = phonet_device_list(sock_net(skb->sk));
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -0800134 rcu_read_lock();
135 list_for_each_entry_rcu(pnd, &pndevs->list, list) {
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700136 u8 addr;
137
138 if (dev_idx > dev_start_idx)
139 addr_start_idx = 0;
140 if (dev_idx++ < dev_start_idx)
141 continue;
142
143 addr_idx = 0;
144 for (addr = find_first_bit(pnd->addrs, 64); addr < 64;
145 addr = find_next_bit(pnd->addrs, 64, 1+addr)) {
146 if (addr_idx++ < addr_start_idx)
147 continue;
148
149 if (fill_addr(skb, pnd->netdev, addr << 2,
150 NETLINK_CB(cb->skb).pid,
Rémi Denis-Courmont998ec752009-09-08 23:59:51 +0000151 cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0)
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700152 goto out;
153 }
154 }
155
156out:
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -0800157 rcu_read_unlock();
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700158 cb->args[0] = dev_idx;
159 cb->args[1] = addr_idx;
160
161 return skb->len;
162}
163
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000164/* Routes handling */
165
166static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst,
167 u32 pid, u32 seq, int event)
168{
169 struct rtmsg *rtm;
170 struct nlmsghdr *nlh;
171
172 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*rtm), 0);
173 if (nlh == NULL)
174 return -EMSGSIZE;
175
176 rtm = nlmsg_data(nlh);
177 rtm->rtm_family = AF_PHONET;
178 rtm->rtm_dst_len = 6;
179 rtm->rtm_src_len = 0;
180 rtm->rtm_tos = 0;
181 rtm->rtm_table = RT_TABLE_MAIN;
182 rtm->rtm_protocol = RTPROT_STATIC;
183 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
184 rtm->rtm_type = RTN_UNICAST;
185 rtm->rtm_flags = 0;
186 NLA_PUT_U8(skb, RTA_DST, dst);
187 NLA_PUT_U32(skb, RTA_OIF, dev->ifindex);
188 return nlmsg_end(skb, nlh);
189
190nla_put_failure:
191 nlmsg_cancel(skb, nlh);
192 return -EMSGSIZE;
193}
194
195void rtm_phonet_notify(int event, struct net_device *dev, u8 dst)
196{
197 struct sk_buff *skb;
198 int err = -ENOBUFS;
199
200 skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
201 nla_total_size(1) + nla_total_size(4), GFP_KERNEL);
202 if (skb == NULL)
203 goto errout;
204 err = fill_route(skb, dev, dst, 0, 0, event);
205 if (err < 0) {
206 WARN_ON(err == -EMSGSIZE);
207 kfree_skb(skb);
208 goto errout;
209 }
210 rtnl_notify(skb, dev_net(dev), 0,
211 RTNLGRP_PHONET_ROUTE, NULL, GFP_KERNEL);
212 return;
213errout:
Rémi Denis-Courmont4b7673a2009-11-02 22:41:28 +0000214 rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_ROUTE, err);
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000215}
216
217static const struct nla_policy rtm_phonet_policy[RTA_MAX+1] = {
218 [RTA_DST] = { .type = NLA_U8 },
219 [RTA_OIF] = { .type = NLA_U32 },
220};
221
222static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *attr)
223{
224 struct net *net = sock_net(skb->sk);
225 struct nlattr *tb[RTA_MAX+1];
226 struct net_device *dev;
227 struct rtmsg *rtm;
228 int err;
229 u8 dst;
230
231 if (!capable(CAP_SYS_ADMIN))
232 return -EPERM;
233
234 ASSERT_RTNL();
235
236 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_phonet_policy);
237 if (err < 0)
238 return err;
239
240 rtm = nlmsg_data(nlh);
241 if (rtm->rtm_table != RT_TABLE_MAIN || rtm->rtm_type != RTN_UNICAST)
242 return -EINVAL;
243 if (tb[RTA_DST] == NULL || tb[RTA_OIF] == NULL)
244 return -EINVAL;
245 dst = nla_get_u8(tb[RTA_DST]);
246 if (dst & 3) /* Phonet addresses only have 6 high-order bits */
247 return -EINVAL;
248
249 dev = __dev_get_by_index(net, nla_get_u32(tb[RTA_OIF]));
250 if (dev == NULL)
251 return -ENODEV;
252
253 if (nlh->nlmsg_type == RTM_NEWROUTE)
254 err = phonet_route_add(dev, dst);
255 else
256 err = phonet_route_del(dev, dst);
257 if (!err)
258 rtm_phonet_notify(nlh->nlmsg_type, dev, dst);
259 return err;
260}
261
262static int route_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
263{
264 struct net *net = sock_net(skb->sk);
265 u8 addr, addr_idx = 0, addr_start_idx = cb->args[0];
266
267 for (addr = 0; addr < 64; addr++) {
268 struct net_device *dev;
269
270 dev = phonet_route_get(net, addr << 2);
271 if (!dev)
272 continue;
273
274 if (addr_idx++ < addr_start_idx)
275 continue;
276 if (fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).pid,
277 cb->nlh->nlmsg_seq, RTM_NEWROUTE))
278 goto out;
279 }
280
281out:
282 cb->args[0] = addr_idx;
283 cb->args[1] = 0;
284
285 return skb->len;
286}
287
remi.denis-courmont@nokia660f7062009-01-23 03:00:28 +0000288int __init phonet_netlink_register(void)
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700289{
remi.denis-courmont@nokia660f7062009-01-23 03:00:28 +0000290 int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit, NULL);
291 if (err)
292 return err;
293
294 /* Further __rtnl_register() cannot fail */
295 __rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL);
296 __rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit);
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000297 __rtnl_register(PF_PHONET, RTM_NEWROUTE, route_doit, NULL);
298 __rtnl_register(PF_PHONET, RTM_DELROUTE, route_doit, NULL);
299 __rtnl_register(PF_PHONET, RTM_GETROUTE, NULL, route_dumpit);
remi.denis-courmont@nokia660f7062009-01-23 03:00:28 +0000300 return 0;
Remi Denis-Courmont8fb39742008-09-22 20:04:30 -0700301}