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vlan: Add GVRP support

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Add GVRP support for dynamically registering VLANs with switches.

By default GVRP is disabled because we only support the applicant-only
participant model, which means it should not be enabled on vlans that
are members of a bridge. Since there is currently no way to cleanly
determine that, the user is responsible for enabling it.

The code is pretty small and low impact, its wrapped in a config
option though because it depends on the GARP implementation and
the STP core.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2008-07-05 21:26:57 -07:00 committed by David S. Miller
parent ce305002e1
commit 70c03b49b8
9 changed files with 134 additions and 13 deletions
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1
include/linux/if_vlan.h
View File

@ -402,6 +402,7 @@ enum vlan_ioctl_cmds {
enum vlan_flags {
VLAN_FLAG_REORDER_HDR = 0x1,
VLAN_FLAG_GVRP = 0x2,
};
enum vlan_name_types {

1
include/net/garp.h
View File

@ -84,6 +84,7 @@ struct garp_attr {
};
enum garp_applications {
GARP_APPLICATION_GVRP,
__GARP_APPLICATION_MAX
};
#define GARP_APPLICATION_MAX (__GARP_APPLICATION_MAX - 1)

10
net/8021q/Kconfig
View File

@ -17,3 +17,13 @@ config VLAN_8021Q
will be called 8021q.
If unsure, say N.
config VLAN_8021Q_GVRP
bool "GVRP (GARP VLAN Registration Protocol) support"
depends on VLAN_8021Q
select GARP
help
Select this to enable GVRP end-system support. GVRP is used for
automatic propagation of registered VLANs to switches.
If unsure, say N.

9
net/8021q/Makefile
View File

@ -4,9 +4,6 @@
obj-$(CONFIG_VLAN_8021Q) += 8021q.o
8021q-objs := vlan.o vlan_dev.o vlan_netlink.o
ifeq ($(CONFIG_PROC_FS),y)
8021q-objs += vlanproc.o
endif
8021q-y := vlan.o vlan_dev.o vlan_netlink.o
8021q-$(CONFIG_VLAN_8021Q_GVRP) += vlan_gvrp.o
8021q-$(CONFIG_PROC_FS) += vlanproc.o

23
net/8021q/vlan.c
View File

@ -169,6 +169,8 @@ void unregister_vlan_dev(struct net_device *dev)
/* If the group is now empty, kill off the group. */
if (grp->nr_vlans == 0) {
vlan_gvrp_uninit_applicant(real_dev);
if (real_dev->features & NETIF_F_HW_VLAN_RX)
real_dev->vlan_rx_register(real_dev, NULL);
@ -249,15 +251,18 @@ int register_vlan_dev(struct net_device *dev)
ngrp = grp = vlan_group_alloc(real_dev);
if (!grp)
return -ENOBUFS;
err = vlan_gvrp_init_applicant(real_dev);
if (err < 0)
goto out_free_group;
}
err = vlan_group_prealloc_vid(grp, vlan_id);
if (err < 0)
goto out_free_group;
goto out_uninit_applicant;
err = register_netdevice(dev);
if (err < 0)
goto out_free_group;
goto out_uninit_applicant;
/* Account for reference in struct vlan_dev_info */
dev_hold(real_dev);
@ -278,6 +283,9 @@ int register_vlan_dev(struct net_device *dev)
return 0;
out_uninit_applicant:
if (ngrp)
vlan_gvrp_uninit_applicant(real_dev);
out_free_group:
if (ngrp)
vlan_group_free(ngrp);
@ -713,14 +721,20 @@ static int __init vlan_proto_init(void)
if (err < 0)
goto err2;
err = vlan_netlink_init();
err = vlan_gvrp_init();
if (err < 0)
goto err3;
err = vlan_netlink_init();
if (err < 0)
goto err4;
dev_add_pack(&vlan_packet_type);
vlan_ioctl_set(vlan_ioctl_handler);
return 0;
err4:
vlan_gvrp_uninit();
err3:
unregister_netdevice_notifier(&vlan_notifier_block);
err2:
@ -745,8 +759,9 @@ static void __exit vlan_cleanup_module(void)
BUG_ON(!hlist_empty(&vlan_group_hash[i]));
unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
synchronize_net();
vlan_gvrp_uninit();
}
module_init(vlan_proto_init);

16
net/8021q/vlan.h
View File

@ -37,6 +37,22 @@ void vlan_setup(struct net_device *dev);
int register_vlan_dev(struct net_device *dev);
void unregister_vlan_dev(struct net_device *dev);
#ifdef CONFIG_VLAN_8021Q_GVRP
extern int vlan_gvrp_request_join(const struct net_device *dev);
extern void vlan_gvrp_request_leave(const struct net_device *dev);
extern int vlan_gvrp_init_applicant(struct net_device *dev);
extern void vlan_gvrp_uninit_applicant(struct net_device *dev);
extern int vlan_gvrp_init(void);
extern void vlan_gvrp_uninit(void);
#else
static inline int vlan_gvrp_request_join(const struct net_device *dev) { return 0; }
static inline void vlan_gvrp_request_leave(const struct net_device *dev) {}
static inline int vlan_gvrp_init_applicant(struct net_device *dev) { return 0; }
static inline void vlan_gvrp_uninit_applicant(struct net_device *dev) {}
static inline int vlan_gvrp_init(void) { return 0; }
static inline void vlan_gvrp_uninit(void) {}
#endif
int vlan_netlink_init(void);
void vlan_netlink_fini(void);

18
net/8021q/vlan_dev.c
View File

@ -512,10 +512,17 @@ int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
struct vlan_dev_info *vlan = vlan_dev_info(dev);
u32 old_flags = vlan->flags;
if (mask & ~VLAN_FLAG_REORDER_HDR)
if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
return -EINVAL;
vlan->flags = (old_flags & ~mask) | (flags & mask);
if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
if (vlan->flags & VLAN_FLAG_GVRP)
vlan_gvrp_request_join(dev);
else
vlan_gvrp_request_leave(dev);
}
return 0;
}
@ -550,12 +557,19 @@ static int vlan_dev_open(struct net_device *dev)
if (dev->flags & IFF_PROMISC)
dev_set_promiscuity(real_dev, 1);
if (vlan->flags & VLAN_FLAG_GVRP)
vlan_gvrp_request_join(dev);
return 0;
}
static int vlan_dev_stop(struct net_device *dev)
{
struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
struct vlan_dev_info *vlan = vlan_dev_info(dev);
struct net_device *real_dev = vlan->real_dev;
if (vlan->flags & VLAN_FLAG_GVRP)
vlan_gvrp_request_leave(dev);
dev_mc_unsync(real_dev, dev);
dev_unicast_unsync(real_dev, dev);

66
net/8021q/vlan_gvrp.c Normal file
View File

@ -0,0 +1,66 @@
/*
* IEEE 802.1Q GARP VLAN Registration Protocol (GVRP)
*
* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*/
#include <linux/types.h>
#include <linux/if_vlan.h>
#include <net/garp.h>
#include "vlan.h"
#define GARP_GVRP_ADDRESS { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x21 }
enum gvrp_attributes {
GVRP_ATTR_INVALID,
GVRP_ATTR_VID,
__GVRP_ATTR_MAX
};
#define GVRP_ATTR_MAX (__GVRP_ATTR_MAX - 1)
static struct garp_application vlan_gvrp_app __read_mostly = {
.proto.group_address = GARP_GVRP_ADDRESS,
.maxattr = GVRP_ATTR_MAX,
.type = GARP_APPLICATION_GVRP,
};
int vlan_gvrp_request_join(const struct net_device *dev)
{
const struct vlan_dev_info *vlan = vlan_dev_info(dev);
__be16 vid = htons(vlan->vlan_id);
return garp_request_join(vlan->real_dev, &vlan_gvrp_app,
&vid, sizeof(vid), GVRP_ATTR_VID);
}
void vlan_gvrp_request_leave(const struct net_device *dev)
{
const struct vlan_dev_info *vlan = vlan_dev_info(dev);
__be16 vid = htons(vlan->vlan_id);
garp_request_leave(vlan->real_dev, &vlan_gvrp_app,
&vid, sizeof(vid), GVRP_ATTR_VID);
}
int vlan_gvrp_init_applicant(struct net_device *dev)
{
return garp_init_applicant(dev, &vlan_gvrp_app);
}
void vlan_gvrp_uninit_applicant(struct net_device *dev)
{
garp_uninit_applicant(dev, &vlan_gvrp_app);
}
int __init vlan_gvrp_init(void)
{
return garp_register_application(&vlan_gvrp_app);
}
void vlan_gvrp_uninit(void)
{
garp_unregister_application(&vlan_gvrp_app);
}

3
net/8021q/vlan_netlink.c
View File

@ -59,7 +59,8 @@ static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
}
if (data[IFLA_VLAN_FLAGS]) {
flags = nla_data(data[IFLA_VLAN_FLAGS]);
if ((flags->flags & flags->mask) & ~VLAN_FLAG_REORDER_HDR)
if ((flags->flags & flags->mask) &
~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
return -EINVAL;
}