1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/*
* Linux NET3: Multicast List maintenance.
*
* Authors:
* Tim Kordas <tjk@nostromo.eeap.cwru.edu>
* Richard Underwood <richard@wuzz.demon.co.uk>
*
* Stir fried together from the IP multicast and CAP patches above
* Alan Cox <Alan.Cox@linux.org>
*
* Fixes:
* Alan Cox : Update the device on a real delete
* rather than any time but...
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <asm/segment.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/if_ether.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include "ip.h"
#include "route.h"
#include <linux/skbuff.h>
#include "sock.h"
#include "arp.h"
/*
* Device multicast list maintenance. This knows about such little matters as promiscuous mode and
* converting from the list to the array the drivers use. At least until I fix the drivers up.
*
* This is used both by IP and by the user level maintenance functions. Unlike BSD we maintain a usage count
* on a given multicast address so that a casual user application can add/delete multicasts used by protocols
* without doing damage to the protocols when it deletes the entries. It also helps IP as it tracks overlapping
* maps.
*/
/*
* Update the multicast list into the physical NIC controller.
*/
void dev_mc_upload(struct device *dev)
{
struct dev_mc_list *dmi;
char *data, *tmp;
/* Don't do anything till we up the interface
[dev_open will call this function so the list will
stay sane] */
if(!(dev->flags&IFF_UP))
return;
/* Devices with no set multicast don't get set */
if(dev->set_multicast_list==NULL)
return;
/* Promiscuous is promiscuous - so no filter needed */
if(dev->flags&IFF_PROMISC)
{
dev->set_multicast_list(dev, -1, NULL);
return;
}
if(dev->mc_count==0)
{
dev->set_multicast_list(dev,0,NULL);
return;
}
data=kmalloc(dev->mc_count*dev->addr_len, GFP_KERNEL);
if(data==NULL)
{
printk("Unable to get memory to set multicast list on %s\n",dev->name);
return;
}
for(tmp = data, dmi=dev->mc_list;dmi!=NULL;dmi=dmi->next)
{
memcpy(tmp,dmi->dmi_addr, dmi->dmi_addrlen);
tmp+=dev->addr_len;
}
dev->set_multicast_list(dev,dev->mc_count,data);
kfree(data);
}
/*
* Delete a device level multicast
*/
void dev_mc_delete(struct device *dev, void *addr, int alen, int all)
{
struct dev_mc_list **dmi;
for(dmi=&dev->mc_list;*dmi!=NULL;dmi=&(*dmi)->next)
{
if(memcmp((*dmi)->dmi_addr,addr,(*dmi)->dmi_addrlen)==0 && alen==(*dmi)->dmi_addrlen)
{
struct dev_mc_list *tmp= *dmi;
if(--(*dmi)->dmi_users && !all)
return;
*dmi=(*dmi)->next;
dev->mc_count--;
kfree_s(tmp,sizeof(*tmp));
dev_mc_upload(dev);
return;
}
}
}
/*
* Add a device level multicast
*/
void dev_mc_add(struct device *dev, void *addr, int alen, int newonly)
{
struct dev_mc_list *dmi;
for(dmi=dev->mc_list;dmi!=NULL;dmi=dmi->next)
{
if(memcmp(dmi->dmi_addr,addr,dmi->dmi_addrlen)==0 && dmi->dmi_addrlen==alen)
{
if(!newonly)
dmi->dmi_users++;
return;
}
}
dmi=(struct dev_mc_list *)kmalloc(sizeof(*dmi),GFP_KERNEL);
if(dmi==NULL)
return; /* GFP_KERNEL so can't happen anyway */
memcpy(dmi->dmi_addr, addr, alen);
dmi->dmi_addrlen=alen;
dmi->next=dev->mc_list;
dmi->dmi_users=1;
dev->mc_list=dmi;
dev->mc_count++;
dev_mc_upload(dev);
}
/*
* Discard multicast list when a device is downed
*/
void dev_mc_discard(struct device *dev)
{
while(dev->mc_list!=NULL)
{
struct dev_mc_list *tmp=dev->mc_list;
dev->mc_list=dev->mc_list->next;
kfree_s(tmp,sizeof(*tmp));
}
dev->mc_count=0;
}
|
