Commit | Line | Data |
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2b27bdcc | 1 | // SPDX-License-Identifier: GPL-2.0-only |
8fb39740 RDC |
2 | /* |
3 | * File: pn_netlink.c | |
4 | * | |
5 | * Phonet netlink interface | |
6 | * | |
7 | * Copyright (C) 2008 Nokia Corporation. | |
8 | * | |
31fdc555 RDC |
9 | * Authors: Sakari Ailus <sakari.ailus@nokia.com> |
10 | * Remi Denis-Courmont | |
8fb39740 RDC |
11 | */ |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/netlink.h> | |
15 | #include <linux/phonet.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
8fb39740 RDC |
17 | #include <net/sock.h> |
18 | #include <net/phonet/pn_dev.h> | |
19 | ||
f062f41d RDC |
20 | /* Device address handling */ |
21 | ||
8fb39740 | 22 | static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr, |
15e47304 | 23 | u32 portid, u32 seq, int event); |
8fb39740 | 24 | |
c7a1a4c8 | 25 | void phonet_address_notify(int event, struct net_device *dev, u8 addr) |
8fb39740 RDC |
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 | } | |
1ce85fe4 PNA |
40 | rtnl_notify(skb, dev_net(dev), 0, |
41 | RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL); | |
42 | return; | |
8fb39740 | 43 | errout: |
4b7673a0 | 44 | rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err); |
8fb39740 RDC |
45 | } |
46 | ||
8980713b RDC |
47 | static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = { |
48 | [IFA_LOCAL] = { .type = NLA_U8 }, | |
49 | }; | |
50 | ||
c21ef3e3 DA |
51 | static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh, |
52 | struct netlink_ext_ack *extack) | |
8fb39740 | 53 | { |
8980713b RDC |
54 | struct net *net = sock_net(skb->sk); |
55 | struct nlattr *tb[IFA_MAX+1]; | |
8fb39740 | 56 | struct net_device *dev; |
8980713b | 57 | struct ifaddrmsg *ifm; |
8fb39740 RDC |
58 | int err; |
59 | u8 pnaddr; | |
60 | ||
90f62cf3 | 61 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
62 | return -EPERM; |
63 | ||
90f62cf3 | 64 | if (!netlink_capable(skb, CAP_SYS_ADMIN)) |
8fb39740 RDC |
65 | return -EPERM; |
66 | ||
67 | ASSERT_RTNL(); | |
68 | ||
8cb08174 JB |
69 | err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, |
70 | ifa_phonet_policy, extack); | |
8980713b RDC |
71 | if (err < 0) |
72 | return err; | |
8fb39740 | 73 | |
8980713b RDC |
74 | ifm = nlmsg_data(nlh); |
75 | if (tb[IFA_LOCAL] == NULL) | |
8fb39740 | 76 | return -EINVAL; |
8980713b RDC |
77 | pnaddr = nla_get_u8(tb[IFA_LOCAL]); |
78 | if (pnaddr & 3) | |
79 | /* Phonet addresses only have 6 high-order bits */ | |
8fb39740 RDC |
80 | return -EINVAL; |
81 | ||
8980713b | 82 | dev = __dev_get_by_index(net, ifm->ifa_index); |
8fb39740 RDC |
83 | if (dev == NULL) |
84 | return -ENODEV; | |
85 | ||
8980713b RDC |
86 | if (nlh->nlmsg_type == RTM_NEWADDR) |
87 | err = phonet_address_add(dev, pnaddr); | |
88 | else | |
89 | err = phonet_address_del(dev, pnaddr); | |
8fb39740 | 90 | if (!err) |
c7a1a4c8 | 91 | phonet_address_notify(nlh->nlmsg_type, dev, pnaddr); |
8fb39740 RDC |
92 | return err; |
93 | } | |
94 | ||
95 | static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr, | |
15e47304 | 96 | u32 portid, u32 seq, int event) |
8fb39740 RDC |
97 | { |
98 | struct ifaddrmsg *ifm; | |
99 | struct nlmsghdr *nlh; | |
8fb39740 | 100 | |
15e47304 | 101 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), 0); |
8980713b RDC |
102 | if (nlh == NULL) |
103 | return -EMSGSIZE; | |
104 | ||
105 | ifm = nlmsg_data(nlh); | |
8fb39740 RDC |
106 | ifm->ifa_family = AF_PHONET; |
107 | ifm->ifa_prefixlen = 0; | |
108 | ifm->ifa_flags = IFA_F_PERMANENT; | |
8980713b | 109 | ifm->ifa_scope = RT_SCOPE_LINK; |
8fb39740 | 110 | ifm->ifa_index = dev->ifindex; |
7f116b5b DM |
111 | if (nla_put_u8(skb, IFA_LOCAL, addr)) |
112 | goto nla_put_failure; | |
053c095a JB |
113 | nlmsg_end(skb, nlh); |
114 | return 0; | |
8fb39740 | 115 | |
8980713b RDC |
116 | nla_put_failure: |
117 | nlmsg_cancel(skb, nlh); | |
118 | return -EMSGSIZE; | |
8fb39740 RDC |
119 | } |
120 | ||
121 | static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb) | |
122 | { | |
9a3b7a42 | 123 | struct phonet_device_list *pndevs; |
8fb39740 RDC |
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 | ||
9a3b7a42 | 128 | pndevs = phonet_device_list(sock_net(skb->sk)); |
eeb74a9d RDC |
129 | rcu_read_lock(); |
130 | list_for_each_entry_rcu(pnd, &pndevs->list, list) { | |
8fb39740 RDC |
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; | |
a1ca14ac | 139 | for_each_set_bit(addr, pnd->addrs, 64) { |
8fb39740 RDC |
140 | if (addr_idx++ < addr_start_idx) |
141 | continue; | |
142 | ||
143 | if (fill_addr(skb, pnd->netdev, addr << 2, | |
15e47304 | 144 | NETLINK_CB(cb->skb).portid, |
998ec759 | 145 | cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0) |
8fb39740 RDC |
146 | goto out; |
147 | } | |
148 | } | |
149 | ||
150 | out: | |
eeb74a9d | 151 | rcu_read_unlock(); |
8fb39740 RDC |
152 | cb->args[0] = dev_idx; |
153 | cb->args[1] = addr_idx; | |
154 | ||
155 | return skb->len; | |
156 | } | |
157 | ||
f062f41d RDC |
158 | /* Routes handling */ |
159 | ||
160 | static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst, | |
15e47304 | 161 | u32 portid, u32 seq, int event) |
f062f41d RDC |
162 | { |
163 | struct rtmsg *rtm; | |
164 | struct nlmsghdr *nlh; | |
165 | ||
15e47304 | 166 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), 0); |
f062f41d RDC |
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; | |
7f116b5b DM |
180 | if (nla_put_u8(skb, RTA_DST, dst) || |
181 | nla_put_u32(skb, RTA_OIF, dev->ifindex)) | |
182 | goto nla_put_failure; | |
053c095a JB |
183 | nlmsg_end(skb, nlh); |
184 | return 0; | |
f062f41d RDC |
185 | |
186 | nla_put_failure: | |
187 | nlmsg_cancel(skb, nlh); | |
188 | return -EMSGSIZE; | |
189 | } | |
190 | ||
191 | void 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; | |
209 | errout: | |
4b7673a0 | 210 | rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_ROUTE, err); |
f062f41d RDC |
211 | } |
212 | ||
213 | static const struct nla_policy rtm_phonet_policy[RTA_MAX+1] = { | |
214 | [RTA_DST] = { .type = NLA_U8 }, | |
215 | [RTA_OIF] = { .type = NLA_U32 }, | |
216 | }; | |
217 | ||
c21ef3e3 DA |
218 | static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh, |
219 | struct netlink_ext_ack *extack) | |
f062f41d RDC |
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 | ||
90f62cf3 | 228 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
229 | return -EPERM; |
230 | ||
90f62cf3 | 231 | if (!netlink_capable(skb, CAP_SYS_ADMIN)) |
f062f41d RDC |
232 | return -EPERM; |
233 | ||
234 | ASSERT_RTNL(); | |
235 | ||
8cb08174 JB |
236 | err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
237 | rtm_phonet_policy, extack); | |
f062f41d RDC |
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 | ||
263 | static int route_dumpit(struct sk_buff *skb, struct netlink_callback *cb) | |
264 | { | |
265 | struct net *net = sock_net(skb->sk); | |
926e9878 | 266 | u8 addr; |
f062f41d | 267 | |
e67f88dd | 268 | rcu_read_lock(); |
926e9878 JB |
269 | for (addr = cb->args[0]; addr < 64; addr++) { |
270 | struct net_device *dev = phonet_route_get_rcu(net, addr << 2); | |
f062f41d | 271 | |
f062f41d RDC |
272 | if (!dev) |
273 | continue; | |
274 | ||
926e9878 JB |
275 | if (fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).portid, |
276 | cb->nlh->nlmsg_seq, RTM_NEWROUTE) < 0) | |
277 | goto out; | |
f062f41d RDC |
278 | } |
279 | ||
280 | out: | |
e67f88dd | 281 | rcu_read_unlock(); |
926e9878 | 282 | cb->args[0] = addr; |
f062f41d RDC |
283 | |
284 | return skb->len; | |
285 | } | |
286 | ||
660f706d | 287 | int __init phonet_netlink_register(void) |
8fb39740 | 288 | { |
c1c502b5 FW |
289 | int err = rtnl_register_module(THIS_MODULE, PF_PHONET, RTM_NEWADDR, |
290 | addr_doit, NULL, 0); | |
660f706d | 291 | if (err) |
292 | return err; | |
293 | ||
c1c502b5 FW |
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); | |
660f706d | 305 | return 0; |
8fb39740 | 306 | } |