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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * File: pn_netlink.c
4 *
5 * Phonet netlink interface
6 *
7 * Copyright (C) 2008 Nokia Corporation.
8 *
9 * Authors: Sakari Ailus <sakari.ailus@nokia.com>
10 * Remi Denis-Courmont
11 */
12
13#include <linux/kernel.h>
14#include <linux/netlink.h>
15#include <linux/phonet.h>
16#include <linux/slab.h>
17#include <net/sock.h>
18#include <net/phonet/pn_dev.h>
19
20/* Device address handling */
21
22static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
23 u32 portid, u32 seq, int event);
24
25void phonet_address_notify(int event, struct net_device *dev, u8 addr)
26{
27 struct sk_buff *skb;
28 int err = -ENOBUFS;
29
30 skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
31 nla_total_size(1), GFP_KERNEL);
32 if (skb == NULL)
33 goto errout;
34 err = fill_addr(skb, dev, addr, 0, 0, event);
35 if (err < 0) {
36 WARN_ON(err == -EMSGSIZE);
37 kfree_skb(skb);
38 goto errout;
39 }
40 rtnl_notify(skb, dev_net(dev), 0,
41 RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL);
42 return;
43errout:
44 rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err);
45}
46
47static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = {
48 [IFA_LOCAL] = { .type = NLA_U8 },
49};
50
51static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
52 struct netlink_ext_ack *extack)
53{
54 struct net *net = sock_net(skb->sk);
55 struct nlattr *tb[IFA_MAX+1];
56 struct net_device *dev;
57 struct ifaddrmsg *ifm;
58 int err;
59 u8 pnaddr;
60
61 if (!netlink_capable(skb, CAP_NET_ADMIN))
62 return -EPERM;
63
64 if (!netlink_capable(skb, CAP_SYS_ADMIN))
65 return -EPERM;
66
67 ASSERT_RTNL();
68
69 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
70 ifa_phonet_policy, extack);
71 if (err < 0)
72 return err;
73
74 ifm = nlmsg_data(nlh);
75 if (tb[IFA_LOCAL] == NULL)
76 return -EINVAL;
77 pnaddr = nla_get_u8(tb[IFA_LOCAL]);
78 if (pnaddr & 3)
79 /* Phonet addresses only have 6 high-order bits */
80 return -EINVAL;
81
82 dev = __dev_get_by_index(net, ifm->ifa_index);
83 if (dev == NULL)
84 return -ENODEV;
85
86 if (nlh->nlmsg_type == RTM_NEWADDR)
87 err = phonet_address_add(dev, pnaddr);
88 else
89 err = phonet_address_del(dev, pnaddr);
90 if (!err)
91 phonet_address_notify(nlh->nlmsg_type, dev, pnaddr);
92 return err;
93}
94
95static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
96 u32 portid, u32 seq, int event)
97{
98 struct ifaddrmsg *ifm;
99 struct nlmsghdr *nlh;
100
101 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), 0);
102 if (nlh == NULL)
103 return -EMSGSIZE;
104
105 ifm = nlmsg_data(nlh);
106 ifm->ifa_family = AF_PHONET;
107 ifm->ifa_prefixlen = 0;
108 ifm->ifa_flags = IFA_F_PERMANENT;
109 ifm->ifa_scope = RT_SCOPE_LINK;
110 ifm->ifa_index = dev->ifindex;
111 if (nla_put_u8(skb, IFA_LOCAL, addr))
112 goto nla_put_failure;
113 nlmsg_end(skb, nlh);
114 return 0;
115
116nla_put_failure:
117 nlmsg_cancel(skb, nlh);
118 return -EMSGSIZE;
119}
120
121static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
122{
123 struct phonet_device_list *pndevs;
124 struct phonet_device *pnd;
125 int dev_idx = 0, dev_start_idx = cb->args[0];
126 int addr_idx = 0, addr_start_idx = cb->args[1];
127
128 pndevs = phonet_device_list(sock_net(skb->sk));
129 rcu_read_lock();
130 list_for_each_entry_rcu(pnd, &pndevs->list, list) {
131 u8 addr;
132
133 if (dev_idx > dev_start_idx)
134 addr_start_idx = 0;
135 if (dev_idx++ < dev_start_idx)
136 continue;
137
138 addr_idx = 0;
139 for_each_set_bit(addr, pnd->addrs, 64) {
140 if (addr_idx++ < addr_start_idx)
141 continue;
142
143 if (fill_addr(skb, pnd->netdev, addr << 2,
144 NETLINK_CB(cb->skb).portid,
145 cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0)
146 goto out;
147 }
148 }
149
150out:
151 rcu_read_unlock();
152 cb->args[0] = dev_idx;
153 cb->args[1] = addr_idx;
154
155 return skb->len;
156}
157
158/* Routes handling */
159
160static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst,
161 u32 portid, u32 seq, int event)
162{
163 struct rtmsg *rtm;
164 struct nlmsghdr *nlh;
165
166 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), 0);
167 if (nlh == NULL)
168 return -EMSGSIZE;
169
170 rtm = nlmsg_data(nlh);
171 rtm->rtm_family = AF_PHONET;
172 rtm->rtm_dst_len = 6;
173 rtm->rtm_src_len = 0;
174 rtm->rtm_tos = 0;
175 rtm->rtm_table = RT_TABLE_MAIN;
176 rtm->rtm_protocol = RTPROT_STATIC;
177 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
178 rtm->rtm_type = RTN_UNICAST;
179 rtm->rtm_flags = 0;
180 if (nla_put_u8(skb, RTA_DST, dst) ||
181 nla_put_u32(skb, RTA_OIF, dev->ifindex))
182 goto nla_put_failure;
183 nlmsg_end(skb, nlh);
184 return 0;
185
186nla_put_failure:
187 nlmsg_cancel(skb, nlh);
188 return -EMSGSIZE;
189}
190
191void rtm_phonet_notify(int event, struct net_device *dev, u8 dst)
192{
193 struct sk_buff *skb;
194 int err = -ENOBUFS;
195
196 skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
197 nla_total_size(1) + nla_total_size(4), GFP_KERNEL);
198 if (skb == NULL)
199 goto errout;
200 err = fill_route(skb, dev, dst, 0, 0, event);
201 if (err < 0) {
202 WARN_ON(err == -EMSGSIZE);
203 kfree_skb(skb);
204 goto errout;
205 }
206 rtnl_notify(skb, dev_net(dev), 0,
207 RTNLGRP_PHONET_ROUTE, NULL, GFP_KERNEL);
208 return;
209errout:
210 rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_ROUTE, err);
211}
212
213static const struct nla_policy rtm_phonet_policy[RTA_MAX+1] = {
214 [RTA_DST] = { .type = NLA_U8 },
215 [RTA_OIF] = { .type = NLA_U32 },
216};
217
218static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
219 struct netlink_ext_ack *extack)
220{
221 struct net *net = sock_net(skb->sk);
222 struct nlattr *tb[RTA_MAX+1];
223 struct net_device *dev;
224 struct rtmsg *rtm;
225 int err;
226 u8 dst;
227
228 if (!netlink_capable(skb, CAP_NET_ADMIN))
229 return -EPERM;
230
231 if (!netlink_capable(skb, CAP_SYS_ADMIN))
232 return -EPERM;
233
234 ASSERT_RTNL();
235
236 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
237 rtm_phonet_policy, extack);
238 if (err < 0)
239 return err;
240
241 rtm = nlmsg_data(nlh);
242 if (rtm->rtm_table != RT_TABLE_MAIN || rtm->rtm_type != RTN_UNICAST)
243 return -EINVAL;
244 if (tb[RTA_DST] == NULL || tb[RTA_OIF] == NULL)
245 return -EINVAL;
246 dst = nla_get_u8(tb[RTA_DST]);
247 if (dst & 3) /* Phonet addresses only have 6 high-order bits */
248 return -EINVAL;
249
250 dev = __dev_get_by_index(net, nla_get_u32(tb[RTA_OIF]));
251 if (dev == NULL)
252 return -ENODEV;
253
254 if (nlh->nlmsg_type == RTM_NEWROUTE)
255 err = phonet_route_add(dev, dst);
256 else
257 err = phonet_route_del(dev, dst);
258 if (!err)
259 rtm_phonet_notify(nlh->nlmsg_type, dev, dst);
260 return err;
261}
262
263static int route_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
264{
265 struct net *net = sock_net(skb->sk);
266 u8 addr;
267
268 rcu_read_lock();
269 for (addr = cb->args[0]; addr < 64; addr++) {
270 struct net_device *dev = phonet_route_get_rcu(net, addr << 2);
271
272 if (!dev)
273 continue;
274
275 if (fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).portid,
276 cb->nlh->nlmsg_seq, RTM_NEWROUTE) < 0)
277 goto out;
278 }
279
280out:
281 rcu_read_unlock();
282 cb->args[0] = addr;
283
284 return skb->len;
285}
286
287int __init phonet_netlink_register(void)
288{
289 int err = rtnl_register_module(THIS_MODULE, PF_PHONET, RTM_NEWADDR,
290 addr_doit, NULL, 0);
291 if (err)
292 return err;
293
294 /* Further rtnl_register_module() cannot fail */
295 rtnl_register_module(THIS_MODULE, PF_PHONET, RTM_DELADDR,
296 addr_doit, NULL, 0);
297 rtnl_register_module(THIS_MODULE, PF_PHONET, RTM_GETADDR,
298 NULL, getaddr_dumpit, 0);
299 rtnl_register_module(THIS_MODULE, PF_PHONET, RTM_NEWROUTE,
300 route_doit, NULL, 0);
301 rtnl_register_module(THIS_MODULE, PF_PHONET, RTM_DELROUTE,
302 route_doit, NULL, 0);
303 rtnl_register_module(THIS_MODULE, PF_PHONET, RTM_GETROUTE,
304 NULL, route_dumpit, 0);
305 return 0;
306}
1/*
2 * File: pn_netlink.c
3 *
4 * Phonet netlink interface
5 *
6 * Copyright (C) 2008 Nokia Corporation.
7 *
8 * Authors: Sakari Ailus <sakari.ailus@nokia.com>
9 * Remi Denis-Courmont
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 <linux/slab.h>
30#include <net/sock.h>
31#include <net/phonet/pn_dev.h>
32
33/* Device address handling */
34
35static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
36 u32 pid, u32 seq, int event);
37
38void phonet_address_notify(int event, struct net_device *dev, u8 addr)
39{
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 }
53 rtnl_notify(skb, dev_net(dev), 0,
54 RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL);
55 return;
56errout:
57 rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err);
58}
59
60static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = {
61 [IFA_LOCAL] = { .type = NLA_U8 },
62};
63
64static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *attr)
65{
66 struct net *net = sock_net(skb->sk);
67 struct nlattr *tb[IFA_MAX+1];
68 struct net_device *dev;
69 struct ifaddrmsg *ifm;
70 int err;
71 u8 pnaddr;
72
73 if (!capable(CAP_SYS_ADMIN))
74 return -EPERM;
75
76 ASSERT_RTNL();
77
78 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_phonet_policy);
79 if (err < 0)
80 return err;
81
82 ifm = nlmsg_data(nlh);
83 if (tb[IFA_LOCAL] == NULL)
84 return -EINVAL;
85 pnaddr = nla_get_u8(tb[IFA_LOCAL]);
86 if (pnaddr & 3)
87 /* Phonet addresses only have 6 high-order bits */
88 return -EINVAL;
89
90 dev = __dev_get_by_index(net, ifm->ifa_index);
91 if (dev == NULL)
92 return -ENODEV;
93
94 if (nlh->nlmsg_type == RTM_NEWADDR)
95 err = phonet_address_add(dev, pnaddr);
96 else
97 err = phonet_address_del(dev, pnaddr);
98 if (!err)
99 phonet_address_notify(nlh->nlmsg_type, dev, pnaddr);
100 return err;
101}
102
103static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
104 u32 pid, u32 seq, int event)
105{
106 struct ifaddrmsg *ifm;
107 struct nlmsghdr *nlh;
108
109 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), 0);
110 if (nlh == NULL)
111 return -EMSGSIZE;
112
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 if (nla_put_u8(skb, IFA_LOCAL, addr))
120 goto nla_put_failure;
121 return nlmsg_end(skb, nlh);
122
123nla_put_failure:
124 nlmsg_cancel(skb, nlh);
125 return -EMSGSIZE;
126}
127
128static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
129{
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];
134
135 pndevs = phonet_device_list(sock_net(skb->sk));
136 rcu_read_lock();
137 list_for_each_entry_rcu(pnd, &pndevs->list, list) {
138 u8 addr;
139
140 if (dev_idx > dev_start_idx)
141 addr_start_idx = 0;
142 if (dev_idx++ < dev_start_idx)
143 continue;
144
145 addr_idx = 0;
146 for_each_set_bit(addr, pnd->addrs, 64) {
147 if (addr_idx++ < addr_start_idx)
148 continue;
149
150 if (fill_addr(skb, pnd->netdev, addr << 2,
151 NETLINK_CB(cb->skb).pid,
152 cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0)
153 goto out;
154 }
155 }
156
157out:
158 rcu_read_unlock();
159 cb->args[0] = dev_idx;
160 cb->args[1] = addr_idx;
161
162 return skb->len;
163}
164
165/* Routes handling */
166
167static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst,
168 u32 pid, u32 seq, int event)
169{
170 struct rtmsg *rtm;
171 struct nlmsghdr *nlh;
172
173 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*rtm), 0);
174 if (nlh == NULL)
175 return -EMSGSIZE;
176
177 rtm = nlmsg_data(nlh);
178 rtm->rtm_family = AF_PHONET;
179 rtm->rtm_dst_len = 6;
180 rtm->rtm_src_len = 0;
181 rtm->rtm_tos = 0;
182 rtm->rtm_table = RT_TABLE_MAIN;
183 rtm->rtm_protocol = RTPROT_STATIC;
184 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
185 rtm->rtm_type = RTN_UNICAST;
186 rtm->rtm_flags = 0;
187 if (nla_put_u8(skb, RTA_DST, dst) ||
188 nla_put_u32(skb, RTA_OIF, dev->ifindex))
189 goto nla_put_failure;
190 return nlmsg_end(skb, nlh);
191
192nla_put_failure:
193 nlmsg_cancel(skb, nlh);
194 return -EMSGSIZE;
195}
196
197void rtm_phonet_notify(int event, struct net_device *dev, u8 dst)
198{
199 struct sk_buff *skb;
200 int err = -ENOBUFS;
201
202 skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
203 nla_total_size(1) + nla_total_size(4), GFP_KERNEL);
204 if (skb == NULL)
205 goto errout;
206 err = fill_route(skb, dev, dst, 0, 0, event);
207 if (err < 0) {
208 WARN_ON(err == -EMSGSIZE);
209 kfree_skb(skb);
210 goto errout;
211 }
212 rtnl_notify(skb, dev_net(dev), 0,
213 RTNLGRP_PHONET_ROUTE, NULL, GFP_KERNEL);
214 return;
215errout:
216 rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_ROUTE, err);
217}
218
219static const struct nla_policy rtm_phonet_policy[RTA_MAX+1] = {
220 [RTA_DST] = { .type = NLA_U8 },
221 [RTA_OIF] = { .type = NLA_U32 },
222};
223
224static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *attr)
225{
226 struct net *net = sock_net(skb->sk);
227 struct nlattr *tb[RTA_MAX+1];
228 struct net_device *dev;
229 struct rtmsg *rtm;
230 int err;
231 u8 dst;
232
233 if (!capable(CAP_SYS_ADMIN))
234 return -EPERM;
235
236 ASSERT_RTNL();
237
238 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_phonet_policy);
239 if (err < 0)
240 return err;
241
242 rtm = nlmsg_data(nlh);
243 if (rtm->rtm_table != RT_TABLE_MAIN || rtm->rtm_type != RTN_UNICAST)
244 return -EINVAL;
245 if (tb[RTA_DST] == NULL || tb[RTA_OIF] == NULL)
246 return -EINVAL;
247 dst = nla_get_u8(tb[RTA_DST]);
248 if (dst & 3) /* Phonet addresses only have 6 high-order bits */
249 return -EINVAL;
250
251 dev = __dev_get_by_index(net, nla_get_u32(tb[RTA_OIF]));
252 if (dev == NULL)
253 return -ENODEV;
254
255 if (nlh->nlmsg_type == RTM_NEWROUTE)
256 err = phonet_route_add(dev, dst);
257 else
258 err = phonet_route_del(dev, dst);
259 if (!err)
260 rtm_phonet_notify(nlh->nlmsg_type, dev, dst);
261 return err;
262}
263
264static int route_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
265{
266 struct net *net = sock_net(skb->sk);
267 u8 addr, addr_idx = 0, addr_start_idx = cb->args[0];
268
269 rcu_read_lock();
270 for (addr = 0; addr < 64; addr++) {
271 struct net_device *dev;
272
273 dev = phonet_route_get_rcu(net, addr << 2);
274 if (!dev)
275 continue;
276
277 if (addr_idx++ < addr_start_idx)
278 continue;
279 if (fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).pid,
280 cb->nlh->nlmsg_seq, RTM_NEWROUTE))
281 goto out;
282 }
283
284out:
285 rcu_read_unlock();
286 cb->args[0] = addr_idx;
287 cb->args[1] = 0;
288
289 return skb->len;
290}
291
292int __init phonet_netlink_register(void)
293{
294 int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit,
295 NULL, NULL);
296 if (err)
297 return err;
298
299 /* Further __rtnl_register() cannot fail */
300 __rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL, NULL);
301 __rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit, NULL);
302 __rtnl_register(PF_PHONET, RTM_NEWROUTE, route_doit, NULL, NULL);
303 __rtnl_register(PF_PHONET, RTM_DELROUTE, route_doit, NULL, NULL);
304 __rtnl_register(PF_PHONET, RTM_GETROUTE, NULL, route_dumpit, NULL);
305 return 0;
306}