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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
34
35static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
36 u32 portid, 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)
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_NET_ADMIN))
74 return -EPERM;
75
76 if (!capable(CAP_SYS_ADMIN))
77 return -EPERM;
78
79 ASSERT_RTNL();
80
81 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
91 return -EINVAL;
92
93 dev = __dev_get_by_index(net, ifm->ifa_index);
94 if (dev == NULL)
95 return -ENODEV;
96
97 if (nlh->nlmsg_type == RTM_NEWADDR)
98 err = phonet_address_add(dev, pnaddr);
99 else
100 err = phonet_address_del(dev, pnaddr);
101 if (!err)
102 phonet_address_notify(nlh->nlmsg_type, dev, pnaddr);
103 return err;
104}
105
106static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
107 u32 portid, u32 seq, int event)
108{
109 struct ifaddrmsg *ifm;
110 struct nlmsghdr *nlh;
111
112 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), 0);
113 if (nlh == NULL)
114 return -EMSGSIZE;
115
116 ifm = nlmsg_data(nlh);
117 ifm->ifa_family = AF_PHONET;
118 ifm->ifa_prefixlen = 0;
119 ifm->ifa_flags = IFA_F_PERMANENT;
120 ifm->ifa_scope = RT_SCOPE_LINK;
121 ifm->ifa_index = dev->ifindex;
122 if (nla_put_u8(skb, IFA_LOCAL, addr))
123 goto nla_put_failure;
124 return nlmsg_end(skb, nlh);
125
126nla_put_failure:
127 nlmsg_cancel(skb, nlh);
128 return -EMSGSIZE;
129}
130
131static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
132{
133 struct phonet_device_list *pndevs;
134 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
138 pndevs = phonet_device_list(sock_net(skb->sk));
139 rcu_read_lock();
140 list_for_each_entry_rcu(pnd, &pndevs->list, list) {
141 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;
149 for_each_set_bit(addr, pnd->addrs, 64) {
150 if (addr_idx++ < addr_start_idx)
151 continue;
152
153 if (fill_addr(skb, pnd->netdev, addr << 2,
154 NETLINK_CB(cb->skb).portid,
155 cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0)
156 goto out;
157 }
158 }
159
160out:
161 rcu_read_unlock();
162 cb->args[0] = dev_idx;
163 cb->args[1] = addr_idx;
164
165 return skb->len;
166}
167
168
169
170static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst,
171 u32 portid, u32 seq, int event)
172{
173 struct rtmsg *rtm;
174 struct nlmsghdr *nlh;
175
176 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), 0);
177 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;
190 if (nla_put_u8(skb, RTA_DST, dst) ||
191 nla_put_u32(skb, RTA_OIF, dev->ifindex))
192 goto nla_put_failure;
193 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:
219 rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_ROUTE, err);
220}
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
227static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
228{
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
236 if (!capable(CAP_NET_ADMIN))
237 return -EPERM;
238
239 if (!capable(CAP_SYS_ADMIN))
240 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)
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
275 rcu_read_lock();
276 for (addr = 0; addr < 64; addr++) {
277 struct net_device *dev;
278
279 dev = phonet_route_get_rcu(net, addr << 2);
280 if (!dev)
281 continue;
282
283 if (addr_idx++ < addr_start_idx)
284 continue;
285 if (fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).portid,
286 cb->nlh->nlmsg_seq, RTM_NEWROUTE))
287 goto out;
288 }
289
290out:
291 rcu_read_unlock();
292 cb->args[0] = addr_idx;
293 cb->args[1] = 0;
294
295 return skb->len;
296}
297
298int __init phonet_netlink_register(void)
299{
300 int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit,
301 NULL, NULL);
302 if (err)
303 return err;
304
305
306 __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);
311 return 0;
312}
313
