Commit | Line | Data |
---|---|---|
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 | ||
35 | static void rtmsg_notify(int event, struct net_device *dev, u8 addr) | |
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 | } | |
50 | err = rtnl_notify(skb, dev_net(dev), 0, | |
51 | RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL); | |
52 | errout: | |
53 | if (err < 0) | |
54 | rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err); | |
55 | } | |
56 | ||
8980713b RDC |
57 | static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = { |
58 | [IFA_LOCAL] = { .type = NLA_U8 }, | |
59 | }; | |
60 | ||
61 | static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *attr) | |
8fb39740 | 62 | { |
8980713b RDC |
63 | struct net *net = sock_net(skb->sk); |
64 | struct nlattr *tb[IFA_MAX+1]; | |
8fb39740 | 65 | struct net_device *dev; |
8980713b | 66 | struct ifaddrmsg *ifm; |
8fb39740 RDC |
67 | int err; |
68 | u8 pnaddr; | |
69 | ||
70 | if (!capable(CAP_SYS_ADMIN)) | |
71 | return -EPERM; | |
72 | ||
73 | ASSERT_RTNL(); | |
74 | ||
8980713b RDC |
75 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_phonet_policy); |
76 | if (err < 0) | |
77 | return err; | |
8fb39740 | 78 | |
8980713b RDC |
79 | ifm = nlmsg_data(nlh); |
80 | if (tb[IFA_LOCAL] == NULL) | |
8fb39740 | 81 | return -EINVAL; |
8980713b RDC |
82 | pnaddr = nla_get_u8(tb[IFA_LOCAL]); |
83 | if (pnaddr & 3) | |
84 | /* Phonet addresses only have 6 high-order bits */ | |
8fb39740 RDC |
85 | return -EINVAL; |
86 | ||
8980713b | 87 | dev = __dev_get_by_index(net, ifm->ifa_index); |
8fb39740 RDC |
88 | if (dev == NULL) |
89 | return -ENODEV; | |
90 | ||
8980713b RDC |
91 | if (nlh->nlmsg_type == RTM_NEWADDR) |
92 | err = phonet_address_add(dev, pnaddr); | |
93 | else | |
94 | err = phonet_address_del(dev, pnaddr); | |
8fb39740 | 95 | if (!err) |
8980713b | 96 | rtmsg_notify(nlh->nlmsg_type, dev, pnaddr); |
8fb39740 RDC |
97 | return err; |
98 | } | |
99 | ||
100 | static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr, | |
101 | u32 pid, u32 seq, int event) | |
102 | { | |
103 | struct ifaddrmsg *ifm; | |
104 | struct nlmsghdr *nlh; | |
8fb39740 | 105 | |
8980713b RDC |
106 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), 0); |
107 | if (nlh == NULL) | |
108 | return -EMSGSIZE; | |
109 | ||
110 | ifm = nlmsg_data(nlh); | |
8fb39740 RDC |
111 | ifm->ifa_family = AF_PHONET; |
112 | ifm->ifa_prefixlen = 0; | |
113 | ifm->ifa_flags = IFA_F_PERMANENT; | |
8980713b | 114 | ifm->ifa_scope = RT_SCOPE_LINK; |
8fb39740 | 115 | ifm->ifa_index = dev->ifindex; |
8980713b RDC |
116 | NLA_PUT_U8(skb, IFA_LOCAL, addr); |
117 | return nlmsg_end(skb, nlh); | |
8fb39740 | 118 | |
8980713b RDC |
119 | nla_put_failure: |
120 | nlmsg_cancel(skb, nlh); | |
121 | return -EMSGSIZE; | |
8fb39740 RDC |
122 | } |
123 | ||
124 | static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb) | |
125 | { | |
126 | struct phonet_device *pnd; | |
127 | int dev_idx = 0, dev_start_idx = cb->args[0]; | |
128 | int addr_idx = 0, addr_start_idx = cb->args[1]; | |
129 | ||
130 | spin_lock_bh(&pndevs.lock); | |
131 | list_for_each_entry(pnd, &pndevs.list, list) { | |
132 | u8 addr; | |
133 | ||
134 | if (dev_idx > dev_start_idx) | |
135 | addr_start_idx = 0; | |
136 | if (dev_idx++ < dev_start_idx) | |
137 | continue; | |
138 | ||
139 | addr_idx = 0; | |
140 | for (addr = find_first_bit(pnd->addrs, 64); addr < 64; | |
141 | addr = find_next_bit(pnd->addrs, 64, 1+addr)) { | |
142 | if (addr_idx++ < addr_start_idx) | |
143 | continue; | |
144 | ||
145 | if (fill_addr(skb, pnd->netdev, addr << 2, | |
146 | NETLINK_CB(cb->skb).pid, | |
147 | cb->nlh->nlmsg_seq, RTM_NEWADDR)) | |
148 | goto out; | |
149 | } | |
150 | } | |
151 | ||
152 | out: | |
153 | spin_unlock_bh(&pndevs.lock); | |
154 | cb->args[0] = dev_idx; | |
155 | cb->args[1] = addr_idx; | |
156 | ||
157 | return skb->len; | |
158 | } | |
159 | ||
160 | void __init phonet_netlink_register(void) | |
161 | { | |
8980713b RDC |
162 | rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit, NULL); |
163 | rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL); | |
8fb39740 RDC |
164 | rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit); |
165 | } |