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1 | /* |
2 | * Linux NET3: Multicast List maintenance. |
3 | * |
4 | * Authors: |
5 | * Tim Kordas <tjk@nostromo.eeap.cwru.edu> |
6 | * Richard Underwood <richard@wuzz.demon.co.uk> |
7 | * |
8 | * Stir fried together from the IP multicast and CAP patches above |
9 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
10 | * |
11 | * Fixes: |
12 | * Alan Cox : Update the device on a real delete |
13 | * rather than any time but... |
14 | * Alan Cox : IFF_ALLMULTI support. |
15 | * Alan Cox : New format set_multicast_list() calls. |
16 | * Gleb Natapov : Remove dev_mc_lock. |
17 | * |
18 | * This program is free software; you can redistribute it and/or |
19 | * modify it under the terms of the GNU General Public License |
20 | * as published by the Free Software Foundation; either version |
21 | * 2 of the License, or (at your option) any later version. |
22 | */ |
23 | |
24 | #include <linux/module.h> |
25 | #include <asm/uaccess.h> |
26 | #include <asm/system.h> |
27 | #include <linux/bitops.h> |
28 | #include <linux/types.h> |
29 | #include <linux/kernel.h> |
30 | #include <linux/string.h> |
31 | #include <linux/mm.h> |
32 | #include <linux/socket.h> |
33 | #include <linux/sockios.h> |
34 | #include <linux/in.h> |
35 | #include <linux/errno.h> |
36 | #include <linux/interrupt.h> |
37 | #include <linux/if_ether.h> |
38 | #include <linux/inet.h> |
39 | #include <linux/netdevice.h> |
40 | #include <linux/etherdevice.h> |
41 | #include <linux/proc_fs.h> |
42 | #include <linux/seq_file.h> |
43 | #include <linux/init.h> |
44 | #include <net/net_namespace.h> |
45 | #include <net/ip.h> |
46 | #include <net/route.h> |
47 | #include <linux/skbuff.h> |
48 | #include <net/sock.h> |
49 | #include <net/arp.h> |
50 | |
51 | |
52 | /* |
53 | * Device multicast list maintenance. |
54 | * |
55 | * This is used both by IP and by the user level maintenance functions. |
56 | * Unlike BSD we maintain a usage count on a given multicast address so |
57 | * that a casual user application can add/delete multicasts used by |
58 | * protocols without doing damage to the protocols when it deletes the |
59 | * entries. It also helps IP as it tracks overlapping maps. |
60 | * |
61 | * Device mc lists are changed by bh at least if IPv6 is enabled, |
62 | * so that it must be bh protected. |
63 | * |
64 | * We block accesses to device mc filters with netif_tx_lock. |
65 | */ |
66 | |
67 | /* |
68 | * Delete a device level multicast |
69 | */ |
70 | |
71 | int dev_mc_delete(struct net_device *dev, void *addr, int alen, int glbl) |
72 | { |
73 | int err; |
74 | |
75 | netif_addr_lock_bh(dev); |
76 | err = __dev_addr_delete(&dev->mc_list, &dev->mc_count, |
77 | addr, alen, glbl); |
78 | if (!err) { |
79 | /* |
80 | * We have altered the list, so the card |
81 | * loaded filter is now wrong. Fix it |
82 | */ |
83 | |
84 | __dev_set_rx_mode(dev); |
85 | } |
86 | netif_addr_unlock_bh(dev); |
87 | return err; |
88 | } |
89 | |
90 | /* |
91 | * Add a device level multicast |
92 | */ |
93 | |
94 | int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl) |
95 | { |
96 | int err; |
97 | |
98 | netif_addr_lock_bh(dev); |
99 | if (alen != dev->addr_len) |
100 | err = -EINVAL; |
101 | else |
102 | err = __dev_addr_add(&dev->mc_list, &dev->mc_count, addr, alen, glbl); |
103 | if (!err) |
104 | __dev_set_rx_mode(dev); |
105 | netif_addr_unlock_bh(dev); |
106 | return err; |
107 | } |
108 | |
109 | /** |
110 | * dev_mc_sync - Synchronize device's multicast list to another device |
111 | * @to: destination device |
112 | * @from: source device |
113 | * |
114 | * Add newly added addresses to the destination device and release |
115 | * addresses that have no users left. The source device must be |
116 | * locked by netif_tx_lock_bh. |
117 | * |
118 | * This function is intended to be called from the dev->set_multicast_list |
119 | * or dev->set_rx_mode function of layered software devices. |
120 | */ |
121 | int dev_mc_sync(struct net_device *to, struct net_device *from) |
122 | { |
123 | int err = 0; |
124 | |
125 | netif_addr_lock_bh(to); |
126 | err = __dev_addr_sync(&to->mc_list, &to->mc_count, |
127 | &from->mc_list, &from->mc_count); |
128 | if (!err) |
129 | __dev_set_rx_mode(to); |
130 | netif_addr_unlock_bh(to); |
131 | |
132 | return err; |
133 | } |
134 | EXPORT_SYMBOL(dev_mc_sync); |
135 | |
136 | |
137 | /** |
138 | * dev_mc_unsync - Remove synchronized addresses from the destination |
139 | * device |
140 | * @to: destination device |
141 | * @from: source device |
142 | * |
143 | * Remove all addresses that were added to the destination device by |
144 | * dev_mc_sync(). This function is intended to be called from the |
145 | * dev->stop function of layered software devices. |
146 | */ |
147 | void dev_mc_unsync(struct net_device *to, struct net_device *from) |
148 | { |
149 | netif_addr_lock_bh(from); |
150 | netif_addr_lock(to); |
151 | |
152 | __dev_addr_unsync(&to->mc_list, &to->mc_count, |
153 | &from->mc_list, &from->mc_count); |
154 | __dev_set_rx_mode(to); |
155 | |
156 | netif_addr_unlock(to); |
157 | netif_addr_unlock_bh(from); |
158 | } |
159 | EXPORT_SYMBOL(dev_mc_unsync); |
160 | |
161 | #ifdef CONFIG_PROC_FS |
162 | static int dev_mc_seq_show(struct seq_file *seq, void *v) |
163 | { |
164 | struct dev_addr_list *m; |
165 | struct net_device *dev = v; |
166 | |
167 | if (v == SEQ_START_TOKEN) |
168 | return 0; |
169 | |
170 | netif_addr_lock_bh(dev); |
171 | for (m = dev->mc_list; m; m = m->next) { |
172 | int i; |
173 | |
174 | seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex, |
175 | dev->name, m->dmi_users, m->dmi_gusers); |
176 | |
177 | for (i = 0; i < m->dmi_addrlen; i++) |
178 | seq_printf(seq, "%02x", m->dmi_addr[i]); |
179 | |
180 | seq_putc(seq, '\n'); |
181 | } |
182 | netif_addr_unlock_bh(dev); |
183 | return 0; |
184 | } |
185 | |
186 | static const struct seq_operations dev_mc_seq_ops = { |
187 | .start = dev_seq_start, |
188 | .next = dev_seq_next, |
189 | .stop = dev_seq_stop, |
190 | .show = dev_mc_seq_show, |
191 | }; |
192 | |
193 | static int dev_mc_seq_open(struct inode *inode, struct file *file) |
194 | { |
195 | return seq_open_net(inode, file, &dev_mc_seq_ops, |
196 | sizeof(struct seq_net_private)); |
197 | } |
198 | |
199 | static const struct file_operations dev_mc_seq_fops = { |
200 | .owner = THIS_MODULE, |
201 | .open = dev_mc_seq_open, |
202 | .read = seq_read, |
203 | .llseek = seq_lseek, |
204 | .release = seq_release_net, |
205 | }; |
206 | |
207 | #endif |
208 | |
209 | static int __net_init dev_mc_net_init(struct net *net) |
210 | { |
211 | if (!proc_net_fops_create(net, "dev_mcast", 0, &dev_mc_seq_fops)) |
212 | return -ENOMEM; |
213 | return 0; |
214 | } |
215 | |
216 | static void __net_exit dev_mc_net_exit(struct net *net) |
217 | { |
218 | proc_net_remove(net, "dev_mcast"); |
219 | } |
220 | |
221 | static struct pernet_operations __net_initdata dev_mc_net_ops = { |
222 | .init = dev_mc_net_init, |
223 | .exit = dev_mc_net_exit, |
224 | }; |
225 | |
226 | void __init dev_mcast_init(void) |
227 | { |
228 | register_pernet_subsys(&dev_mc_net_ops); |
229 | } |
230 | |
231 | EXPORT_SYMBOL(dev_mc_add); |
232 | EXPORT_SYMBOL(dev_mc_delete); |
233 |
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