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8fb39740 RDC |
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 <net/sock.h> | |
30 | #include <net/phonet/pn_dev.h> | |
31 | ||
32 | static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr, | |
33 | u32 pid, u32 seq, int event); | |
34 | ||
c7a1a4c8 | 35 | void phonet_address_notify(int event, struct net_device *dev, u8 addr) |
8fb39740 RDC |
36 | { |
37 | struct sk_buff *skb; | |
38 | int err = -ENOBUFS; | |
39 | ||
40 | skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) + | |
41 | nla_total_size(1), GFP_KERNEL); | |
42 | if (skb == NULL) | |
43 | goto errout; | |
44 | err = fill_addr(skb, dev, addr, 0, 0, event); | |
45 | if (err < 0) { | |
46 | WARN_ON(err == -EMSGSIZE); | |
47 | kfree_skb(skb); | |
48 | goto errout; | |
49 | } | |
1ce85fe4 PNA |
50 | rtnl_notify(skb, dev_net(dev), 0, |
51 | RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL); | |
52 | return; | |
8fb39740 RDC |
53 | errout: |
54 | if (err < 0) | |
55 | rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err); | |
56 | } | |
57 | ||
8980713b RDC |
58 | static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = { |
59 | [IFA_LOCAL] = { .type = NLA_U8 }, | |
60 | }; | |
61 | ||
62 | static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *attr) | |
8fb39740 | 63 | { |
8980713b RDC |
64 | struct net *net = sock_net(skb->sk); |
65 | struct nlattr *tb[IFA_MAX+1]; | |
8fb39740 | 66 | struct net_device *dev; |
8980713b | 67 | struct ifaddrmsg *ifm; |
8fb39740 RDC |
68 | int err; |
69 | u8 pnaddr; | |
70 | ||
71 | if (!capable(CAP_SYS_ADMIN)) | |
72 | return -EPERM; | |
73 | ||
74 | ASSERT_RTNL(); | |
75 | ||
8980713b RDC |
76 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_phonet_policy); |
77 | if (err < 0) | |
78 | return err; | |
8fb39740 | 79 | |
8980713b RDC |
80 | ifm = nlmsg_data(nlh); |
81 | if (tb[IFA_LOCAL] == NULL) | |
8fb39740 | 82 | return -EINVAL; |
8980713b RDC |
83 | pnaddr = nla_get_u8(tb[IFA_LOCAL]); |
84 | if (pnaddr & 3) | |
85 | /* Phonet addresses only have 6 high-order bits */ | |
8fb39740 RDC |
86 | return -EINVAL; |
87 | ||
8980713b | 88 | dev = __dev_get_by_index(net, ifm->ifa_index); |
8fb39740 RDC |
89 | if (dev == NULL) |
90 | return -ENODEV; | |
91 | ||
8980713b RDC |
92 | if (nlh->nlmsg_type == RTM_NEWADDR) |
93 | err = phonet_address_add(dev, pnaddr); | |
94 | else | |
95 | err = phonet_address_del(dev, pnaddr); | |
8fb39740 | 96 | if (!err) |
c7a1a4c8 | 97 | phonet_address_notify(nlh->nlmsg_type, dev, pnaddr); |
8fb39740 RDC |
98 | return err; |
99 | } | |
100 | ||
101 | static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr, | |
102 | u32 pid, u32 seq, int event) | |
103 | { | |
104 | struct ifaddrmsg *ifm; | |
105 | struct nlmsghdr *nlh; | |
8fb39740 | 106 | |
8980713b RDC |
107 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), 0); |
108 | if (nlh == NULL) | |
109 | return -EMSGSIZE; | |
110 | ||
111 | ifm = nlmsg_data(nlh); | |
8fb39740 RDC |
112 | ifm->ifa_family = AF_PHONET; |
113 | ifm->ifa_prefixlen = 0; | |
114 | ifm->ifa_flags = IFA_F_PERMANENT; | |
8980713b | 115 | ifm->ifa_scope = RT_SCOPE_LINK; |
8fb39740 | 116 | ifm->ifa_index = dev->ifindex; |
8980713b RDC |
117 | NLA_PUT_U8(skb, IFA_LOCAL, addr); |
118 | return nlmsg_end(skb, nlh); | |
8fb39740 | 119 | |
8980713b RDC |
120 | nla_put_failure: |
121 | nlmsg_cancel(skb, nlh); | |
122 | return -EMSGSIZE; | |
8fb39740 RDC |
123 | } |
124 | ||
125 | static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb) | |
126 | { | |
9a3b7a42 | 127 | struct phonet_device_list *pndevs; |
8fb39740 RDC |
128 | struct phonet_device *pnd; |
129 | int dev_idx = 0, dev_start_idx = cb->args[0]; | |
130 | int addr_idx = 0, addr_start_idx = cb->args[1]; | |
131 | ||
9a3b7a42 | 132 | pndevs = phonet_device_list(sock_net(skb->sk)); |
133 | spin_lock_bh(&pndevs->lock); | |
134 | list_for_each_entry(pnd, &pndevs->list, list) { | |
8fb39740 RDC |
135 | u8 addr; |
136 | ||
137 | if (dev_idx > dev_start_idx) | |
138 | addr_start_idx = 0; | |
139 | if (dev_idx++ < dev_start_idx) | |
140 | continue; | |
141 | ||
142 | addr_idx = 0; | |
143 | for (addr = find_first_bit(pnd->addrs, 64); addr < 64; | |
144 | addr = find_next_bit(pnd->addrs, 64, 1+addr)) { | |
145 | if (addr_idx++ < addr_start_idx) | |
146 | continue; | |
147 | ||
148 | if (fill_addr(skb, pnd->netdev, addr << 2, | |
149 | NETLINK_CB(cb->skb).pid, | |
150 | cb->nlh->nlmsg_seq, RTM_NEWADDR)) | |
151 | goto out; | |
152 | } | |
153 | } | |
154 | ||
155 | out: | |
9a3b7a42 | 156 | spin_unlock_bh(&pndevs->lock); |
8fb39740 RDC |
157 | cb->args[0] = dev_idx; |
158 | cb->args[1] = addr_idx; | |
159 | ||
160 | return skb->len; | |
161 | } | |
162 | ||
660f706d | 163 | int __init phonet_netlink_register(void) |
8fb39740 | 164 | { |
660f706d | 165 | int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit, NULL); |
166 | if (err) | |
167 | return err; | |
168 | ||
169 | /* Further __rtnl_register() cannot fail */ | |
170 | __rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL); | |
171 | __rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit); | |
172 | return 0; | |
8fb39740 | 173 | } |