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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [net/] [core/] [dev_mcast.c] - Blame information for rev 1765

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Line No. Rev Author Line
1 1278 phoenix
/*
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>
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 *
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 *      Stir fried together from the IP multicast and CAP patches above
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 *              Alan Cox <Alan.Cox@linux.org>
10
 *
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 *      Fixes:
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 *              Alan Cox        :       Update the device on a real delete
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 *                                      rather than any time but...
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 *              Alan Cox        :       IFF_ALLMULTI support.
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 *              Alan Cox        :       New format set_multicast_list() calls.
16
 *              Gleb Natapov    :       Remove dev_mc_lock.
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 *
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/config.h> 
25
#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/bitops.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
30
#include <linux/sched.h>
31
#include <linux/string.h>
32
#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/if_ether.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/proc_fs.h>
43
#include <linux/init.h>
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#include <net/ip.h>
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#include <net/route.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/arp.h>
49
 
50
 
51
/*
52
 *      Device multicast list maintenance.
53
 *
54
 *      This is used both by IP and by the user level maintenance functions.
55
 *      Unlike BSD we maintain a usage count on a given multicast address so
56
 *      that a casual user application can add/delete multicasts used by
57
 *      protocols without doing damage to the protocols when it deletes the
58
 *      entries. It also helps IP as it tracks overlapping maps.
59
 *
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 *      Device mc lists are changed by bh at least if IPv6 is enabled,
61
 *      so that it must be bh protected.
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 *
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 *      We block accesses to device mc filters with dev->xmit_lock.
64
 */
65
 
66
/*
67
 *      Update the multicast list into the physical NIC controller.
68
 */
69
 
70
static void __dev_mc_upload(struct net_device *dev)
71
{
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        /* Don't do anything till we up the interface
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         * [dev_open will call this function so the list will
74
         * stay sane]
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         */
76
 
77
        if (!(dev->flags&IFF_UP))
78
                return;
79
 
80
        /*
81
         *      Devices with no set multicast or which have been
82
         *      detached don't get set.
83
         */
84
 
85
        if (dev->set_multicast_list == NULL ||
86
            !netif_device_present(dev))
87
                return;
88
 
89
        dev->set_multicast_list(dev);
90
}
91
 
92
void dev_mc_upload(struct net_device *dev)
93
{
94
        spin_lock_bh(&dev->xmit_lock);
95
        __dev_mc_upload(dev);
96
        spin_unlock_bh(&dev->xmit_lock);
97
}
98
 
99
/*
100
 *      Delete a device level multicast
101
 */
102
 
103
int dev_mc_delete(struct net_device *dev, void *addr, int alen, int glbl)
104
{
105
        int err = 0;
106
        struct dev_mc_list *dmi, **dmip;
107
 
108
        spin_lock_bh(&dev->xmit_lock);
109
 
110
        for (dmip = &dev->mc_list; (dmi = *dmip) != NULL; dmip = &dmi->next) {
111
                /*
112
                 *      Find the entry we want to delete. The device could
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                 *      have variable length entries so check these too.
114
                 */
115
                if (memcmp(dmi->dmi_addr, addr, dmi->dmi_addrlen) == 0 &&
116
                    alen == dmi->dmi_addrlen) {
117
                        if (glbl) {
118
                                int old_glbl = dmi->dmi_gusers;
119
                                dmi->dmi_gusers = 0;
120
                                if (old_glbl == 0)
121
                                        break;
122
                        }
123
                        if (--dmi->dmi_users)
124
                                goto done;
125
 
126
                        /*
127
                         *      Last user. So delete the entry.
128
                         */
129
                        *dmip = dmi->next;
130
                        dev->mc_count--;
131
 
132
                        kfree(dmi);
133
 
134
                        /*
135
                         *      We have altered the list, so the card
136
                         *      loaded filter is now wrong. Fix it
137
                         */
138
                        __dev_mc_upload(dev);
139
 
140
                        spin_unlock_bh(&dev->xmit_lock);
141
                        return 0;
142
                }
143
        }
144
        err = -ENOENT;
145
done:
146
        spin_unlock_bh(&dev->xmit_lock);
147
        return err;
148
}
149
 
150
/*
151
 *      Add a device level multicast
152
 */
153
 
154
int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl)
155
{
156
        int err = 0;
157
        struct dev_mc_list *dmi, *dmi1;
158
 
159
        dmi1 = (struct dev_mc_list *)kmalloc(sizeof(*dmi), GFP_ATOMIC);
160
 
161
        spin_lock_bh(&dev->xmit_lock);
162
        for (dmi = dev->mc_list; dmi != NULL; dmi = dmi->next) {
163
                if (memcmp(dmi->dmi_addr, addr, dmi->dmi_addrlen) == 0 &&
164
                    dmi->dmi_addrlen == alen) {
165
                        if (glbl) {
166
                                int old_glbl = dmi->dmi_gusers;
167
                                dmi->dmi_gusers = 1;
168
                                if (old_glbl)
169
                                        goto done;
170
                        }
171
                        dmi->dmi_users++;
172
                        goto done;
173
                }
174
        }
175
 
176
        if ((dmi = dmi1) == NULL) {
177
                spin_unlock_bh(&dev->xmit_lock);
178
                return -ENOMEM;
179
        }
180
        memcpy(dmi->dmi_addr, addr, alen);
181
        dmi->dmi_addrlen = alen;
182
        dmi->next = dev->mc_list;
183
        dmi->dmi_users = 1;
184
        dmi->dmi_gusers = glbl ? 1 : 0;
185
        dev->mc_list = dmi;
186
        dev->mc_count++;
187
 
188
        __dev_mc_upload(dev);
189
 
190
        spin_unlock_bh(&dev->xmit_lock);
191
        return 0;
192
 
193
done:
194
        spin_unlock_bh(&dev->xmit_lock);
195
        if (dmi1)
196
                kfree(dmi1);
197
        return err;
198
}
199
 
200
/*
201
 *      Discard multicast list when a device is downed
202
 */
203
 
204
void dev_mc_discard(struct net_device *dev)
205
{
206
        spin_lock_bh(&dev->xmit_lock);
207
 
208
        while (dev->mc_list != NULL) {
209
                struct dev_mc_list *tmp = dev->mc_list;
210
                dev->mc_list = tmp->next;
211
                if (tmp->dmi_users > tmp->dmi_gusers)
212
                        printk("dev_mc_discard: multicast leakage! dmi_users=%d\n", tmp->dmi_users);
213
                kfree(tmp);
214
        }
215
        dev->mc_count = 0;
216
 
217
        spin_unlock_bh(&dev->xmit_lock);
218
}
219
 
220
#ifdef CONFIG_PROC_FS
221
static int dev_mc_read_proc(char *buffer, char **start, off_t offset,
222
                            int length, int *eof, void *data)
223
{
224
        off_t pos = 0, begin = 0;
225
        struct dev_mc_list *m;
226
        int len = 0;
227
        struct net_device *dev;
228
 
229
        read_lock(&dev_base_lock);
230
        for (dev = dev_base; dev; dev = dev->next) {
231
                spin_lock_bh(&dev->xmit_lock);
232
                for (m = dev->mc_list; m; m = m->next) {
233
                        int i;
234
 
235
                        len += sprintf(buffer+len,"%-4d %-15s %-5d %-5d ", dev->ifindex,
236
                                       dev->name, m->dmi_users, m->dmi_gusers);
237
 
238
                        for (i = 0; i < m->dmi_addrlen; i++)
239
                                len += sprintf(buffer+len, "%02x", m->dmi_addr[i]);
240
 
241
                        len += sprintf(buffer+len, "\n");
242
 
243
                        pos = begin + len;
244
                        if (pos < offset) {
245
                                len = 0;
246
                                begin = pos;
247
                        }
248
                        if (pos > offset + length) {
249
                                spin_unlock_bh(&dev->xmit_lock);
250
                                goto done;
251
                        }
252
                }
253
                spin_unlock_bh(&dev->xmit_lock);
254
        }
255
        *eof = 1;
256
 
257
done:
258
        read_unlock(&dev_base_lock);
259
        *start = buffer + (offset - begin);
260
        len -= (offset - begin);
261
        if (len > length)
262
                len = length;
263
        if (len < 0)
264
                len = 0;
265
        return len;
266
}
267
#endif
268
 
269
void __init dev_mcast_init(void)
270
{
271
#ifdef CONFIG_PROC_FS
272
        create_proc_read_entry("net/dev_mcast", 0, 0, dev_mc_read_proc, NULL);
273
#endif
274
}
275
 

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