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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 (!netlink_capable(skb, CAP_NET_ADMIN))
74 return -EPERM;
75
76 if (!netlink_capable(skb, 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 nlmsg_end(skb, nlh);
125 return 0;
126
127nla_put_failure:
128 nlmsg_cancel(skb, nlh);
129 return -EMSGSIZE;
130}
131
132static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
133{
134 struct phonet_device_list *pndevs;
135 struct phonet_device *pnd;
136 int dev_idx = 0, dev_start_idx = cb->args[0];
137 int addr_idx = 0, addr_start_idx = cb->args[1];
138
139 pndevs = phonet_device_list(sock_net(skb->sk));
140 rcu_read_lock();
141 list_for_each_entry_rcu(pnd, &pndevs->list, list) {
142 u8 addr;
143
144 if (dev_idx > dev_start_idx)
145 addr_start_idx = 0;
146 if (dev_idx++ < dev_start_idx)
147 continue;
148
149 addr_idx = 0;
150 for_each_set_bit(addr, pnd->addrs, 64) {
151 if (addr_idx++ < addr_start_idx)
152 continue;
153
154 if (fill_addr(skb, pnd->netdev, addr << 2,
155 NETLINK_CB(cb->skb).portid,
156 cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0)
157 goto out;
158 }
159 }
160
161out:
162 rcu_read_unlock();
163 cb->args[0] = dev_idx;
164 cb->args[1] = addr_idx;
165
166 return skb->len;
167}
168
169
170
171static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst,
172 u32 portid, u32 seq, int event)
173{
174 struct rtmsg *rtm;
175 struct nlmsghdr *nlh;
176
177 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), 0);
178 if (nlh == NULL)
179 return -EMSGSIZE;
180
181 rtm = nlmsg_data(nlh);
182 rtm->rtm_family = AF_PHONET;
183 rtm->rtm_dst_len = 6;
184 rtm->rtm_src_len = 0;
185 rtm->rtm_tos = 0;
186 rtm->rtm_table = RT_TABLE_MAIN;
187 rtm->rtm_protocol = RTPROT_STATIC;
188 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
189 rtm->rtm_type = RTN_UNICAST;
190 rtm->rtm_flags = 0;
191 if (nla_put_u8(skb, RTA_DST, dst) ||
192 nla_put_u32(skb, RTA_OIF, dev->ifindex))
193 goto nla_put_failure;
194 nlmsg_end(skb, nlh);
195 return 0;
196
197nla_put_failure:
198 nlmsg_cancel(skb, nlh);
199 return -EMSGSIZE;
200}
201
202void rtm_phonet_notify(int event, struct net_device *dev, u8 dst)
203{
204 struct sk_buff *skb;
205 int err = -ENOBUFS;
206
207 skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
208 nla_total_size(1) + nla_total_size(4), GFP_KERNEL);
209 if (skb == NULL)
210 goto errout;
211 err = fill_route(skb, dev, dst, 0, 0, event);
212 if (err < 0) {
213 WARN_ON(err == -EMSGSIZE);
214 kfree_skb(skb);
215 goto errout;
216 }
217 rtnl_notify(skb, dev_net(dev), 0,
218 RTNLGRP_PHONET_ROUTE, NULL, GFP_KERNEL);
219 return;
220errout:
221 rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_ROUTE, err);
222}
223
224static const struct nla_policy rtm_phonet_policy[RTA_MAX+1] = {
225 [RTA_DST] = { .type = NLA_U8 },
226 [RTA_OIF] = { .type = NLA_U32 },
227};
228
229static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
230{
231 struct net *net = sock_net(skb->sk);
232 struct nlattr *tb[RTA_MAX+1];
233 struct net_device *dev;
234 struct rtmsg *rtm;
235 int err;
236 u8 dst;
237
238 if (!netlink_capable(skb, CAP_NET_ADMIN))
239 return -EPERM;
240
241 if (!netlink_capable(skb, CAP_SYS_ADMIN))
242 return -EPERM;
243
244 ASSERT_RTNL();
245
246 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_phonet_policy);
247 if (err < 0)
248 return err;
249
250 rtm = nlmsg_data(nlh);
251 if (rtm->rtm_table != RT_TABLE_MAIN || rtm->rtm_type != RTN_UNICAST)
252 return -EINVAL;
253 if (tb[RTA_DST] == NULL || tb[RTA_OIF] == NULL)
254 return -EINVAL;
255 dst = nla_get_u8(tb[RTA_DST]);
256 if (dst & 3)
257 return -EINVAL;
258
259 dev = __dev_get_by_index(net, nla_get_u32(tb[RTA_OIF]));
260 if (dev == NULL)
261 return -ENODEV;
262
263 if (nlh->nlmsg_type == RTM_NEWROUTE)
264 err = phonet_route_add(dev, dst);
265 else
266 err = phonet_route_del(dev, dst);
267 if (!err)
268 rtm_phonet_notify(nlh->nlmsg_type, dev, dst);
269 return err;
270}
271
272static int route_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
273{
274 struct net *net = sock_net(skb->sk);
275 u8 addr;
276
277 rcu_read_lock();
278 for (addr = cb->args[0]; addr < 64; addr++) {
279 struct net_device *dev = phonet_route_get_rcu(net, addr << 2);
280
281 if (!dev)
282 continue;
283
284 if (fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).portid,
285 cb->nlh->nlmsg_seq, RTM_NEWROUTE) < 0)
286 goto out;
287 }
288
289out:
290 rcu_read_unlock();
291 cb->args[0] = addr;
292
293 return skb->len;
294}
295
296int __init phonet_netlink_register(void)
297{
298 int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit,
299 NULL, NULL);
300 if (err)
301 return err;
302
303
304 __rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL, NULL);
305 __rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit, NULL);
306 __rtnl_register(PF_PHONET, RTM_NEWROUTE, route_doit, NULL, NULL);
307 __rtnl_register(PF_PHONET, RTM_DELROUTE, route_doit, NULL, NULL);
308 __rtnl_register(PF_PHONET, RTM_GETROUTE, NULL, route_dumpit, NULL);
309 return 0;
310}
311
