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1 | /* |
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 <linux/slab.h> |
30 | #include <net/sock.h> |
31 | #include <net/phonet/pn_dev.h> |
32 | |
33 | /* Device address handling */ |
34 | |
35 | static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr, |
36 | u32 pid, u32 seq, int event); |
37 | |
38 | void 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; |
56 | errout: |
57 | rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err); |
58 | } |
59 | |
60 | static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = { |
61 | [IFA_LOCAL] = { .type = NLA_U8 }, |
62 | }; |
63 | |
64 | static 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 | |
103 | static 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 | NLA_PUT_U8(skb, IFA_LOCAL, addr); |
120 | return nlmsg_end(skb, nlh); |
121 | |
122 | nla_put_failure: |
123 | nlmsg_cancel(skb, nlh); |
124 | return -EMSGSIZE; |
125 | } |
126 | |
127 | static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb) |
128 | { |
129 | struct phonet_device_list *pndevs; |
130 | struct phonet_device *pnd; |
131 | int dev_idx = 0, dev_start_idx = cb->args[0]; |
132 | int addr_idx = 0, addr_start_idx = cb->args[1]; |
133 | |
134 | pndevs = phonet_device_list(sock_net(skb->sk)); |
135 | rcu_read_lock(); |
136 | list_for_each_entry_rcu(pnd, &pndevs->list, list) { |
137 | u8 addr; |
138 | |
139 | if (dev_idx > dev_start_idx) |
140 | addr_start_idx = 0; |
141 | if (dev_idx++ < dev_start_idx) |
142 | continue; |
143 | |
144 | addr_idx = 0; |
145 | for_each_set_bit(addr, pnd->addrs, 64) { |
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, |
151 | cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0) |
152 | goto out; |
153 | } |
154 | } |
155 | |
156 | out: |
157 | rcu_read_unlock(); |
158 | cb->args[0] = dev_idx; |
159 | cb->args[1] = addr_idx; |
160 | |
161 | return skb->len; |
162 | } |
163 | |
164 | /* Routes handling */ |
165 | |
166 | static 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 | |
190 | nla_put_failure: |
191 | nlmsg_cancel(skb, nlh); |
192 | return -EMSGSIZE; |
193 | } |
194 | |
195 | void 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; |
213 | errout: |
214 | rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_ROUTE, err); |
215 | } |
216 | |
217 | static const struct nla_policy rtm_phonet_policy[RTA_MAX+1] = { |
218 | [RTA_DST] = { .type = NLA_U8 }, |
219 | [RTA_OIF] = { .type = NLA_U32 }, |
220 | }; |
221 | |
222 | static 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 | |
262 | static 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 | |
281 | out: |
282 | cb->args[0] = addr_idx; |
283 | cb->args[1] = 0; |
284 | |
285 | return skb->len; |
286 | } |
287 | |
288 | int __init phonet_netlink_register(void) |
289 | { |
290 | 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); |
297 | __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); |
300 | return 0; |
301 | } |
302 |
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