[mirror_ovs.git] / vswitchd / proc-net-compat.c

/* Copyright (c) 2009 Nicira Networks
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <config.h>
#include "proc-net-compat.h"
#include <assert.h>
#include <dirent.h>
#include <errno.h>
#include <inttypes.h>
#include <string.h>
#include "dynamic-string.h"
#include "hash.h"
#include "netlink-protocol.h"
#include "netlink.h"
#include "ofpbuf.h"
#include "openvswitch/brcompat-netlink.h"
#include "hmap.h"
#include "shash.h"
#include "svec.h"

#define THIS_MODULE VLM_proc_net_compat
#include "vlog.h"

/* Netlink socket to bridge compatibility kernel module. */
static struct nl_sock *brc_sock;

/* The Generic Netlink family number used for bridge compatibility. */
static int brc_family = 0;

/* Rate limiting for log messages. */
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5);

static void flush_dir(const char *dir);
static int set_proc_file(const char *dir, const char *file, const char *data);

/* Initializes the /proc/net compatibility layer.  Returns 0 if successful,
 * otherwise a positive errno value. */
int
proc_net_compat_init(void)
{
    if (!brc_sock) {
        int retval = nl_lookup_genl_family(BRC_GENL_FAMILY_NAME, &brc_family);
        if (retval) {
            return retval;
        }

        retval = nl_sock_create(NETLINK_GENERIC, 0, 0, 0, &brc_sock);
        if (retval) {
            return retval;
        }

        flush_dir("/proc/net/vlan");
        flush_dir("/proc/net/bonding");
    }
    return 0;
}

static int
set_proc_file(const char *dir, const char *file, const char *data)
{
    struct ofpbuf request, *reply;
    int retval;

    ofpbuf_init(&request, 0);
    nl_msg_put_genlmsghdr(&request, brc_sock, 1024, brc_family, NLM_F_REQUEST,
                          BRC_GENL_C_SET_PROC, 1);
    nl_msg_put_string(&request, BRC_GENL_A_PROC_DIR, dir);
    nl_msg_put_string(&request, BRC_GENL_A_PROC_NAME, file);
    if (data) {
        nl_msg_put_string(&request, BRC_GENL_A_PROC_DATA, data);
    }

    retval = nl_sock_transact(brc_sock, &request, &reply);
    ofpbuf_uninit(&request);
    ofpbuf_delete(reply);
    if (retval) {
        VLOG_WARN_RL(&rl, "failed to %s /proc/%s/%s (%s)",
                     data ? "update" : "remove", dir, file, strerror(retval));
    }
    return retval;
}

static void
flush_dir(const char *dir)
{
    const char *subdir;
    struct dirent *de;
    DIR *stream;

    assert(!memcmp(dir, "/proc/", 6));
    subdir = dir + 6;

    stream = opendir(dir);
    if (!stream) {
        if (errno != ENOENT) {
            VLOG_WARN_RL(&rl, "%s: open failed (%s)", dir, strerror(errno));
        }
        return;
    }

    while ((de = readdir(stream)) != NULL) {
        if (strcmp(de->d_name, ".") && strcmp(de->d_name, "..")) {
            set_proc_file(subdir, de->d_name, NULL);
        }
    }
    closedir(stream);
}
\f
/* If 'bond' is nonnull, creates a file in /proc/net/bonding for a bond with
 * the given 'name' and the details in 'bond'.  If 'bond' is null, deletes
 * the /proc/net/bonding file with the given 'name'.
 *
 * This function has no effect unless proc_net_compat_init() has been
 * called. */
void
proc_net_compat_update_bond(const char *name, const struct compat_bond *bond)
{
    struct ds ds;
    int i;

    if (!brc_sock) {
        return;
    }

    if (!bond) {
        set_proc_file("net/bonding", name, NULL);
        return;
    }

    ds_init(&ds);
    ds_put_format(
        &ds,
        "Ethernet Channel Bonding Driver: ovs-vswitchd "
        VERSION BUILDNR" ("__DATE__" "__TIME__")\n"
        "Bonding Mode: source load balancing\n"
        "Primary Slave: None\n"
        "Currently Active Slave: None\n"
        "MII Status: %s\n"
        "MII Polling Interval (ms): 100\n"
        "Up Delay (ms): %d\n"
        "Down Delay (ms): %d\n"
        "\n"
        "Source load balancing info:\n",
        bond->up ? "up" : "down", bond->updelay, bond->downdelay);

    for (i = 0; i < bond->n_hashes; i++) {
        const struct compat_bond_hash *cbh = &bond->hashes[i];
        ds_put_format(&ds, " [%03d] = %s\n", cbh->hash, cbh->netdev_name);
    }

    for (i = 0; i < bond->n_slaves; i++) {
        const struct compat_bond_slave *slave = &bond->slaves[i];
        ds_put_format(
            &ds,
            "\n"
            "Slave Interface: %s\n"
            "MII Status: %s\n"
            "Link Failure Count: 0\n"
            "Permanent HW addr: "ETH_ADDR_FMT"\n",
            slave->name, slave->up ? "up" : "down",
            ETH_ADDR_ARGS(slave->mac));
    }
    set_proc_file("net/bonding", name, ds_cstr(&ds));
    ds_destroy(&ds);
}
\f
/* /proc/net/vlan compatibility.
 *
 * This is much more complex than I expected it to be. */

struct compat_vlan {
    /* Hash key. */
    struct hmap_node trunk_node; /* Hash map node. */
    char *trunk_dev;             /* Name of trunk network device. */
    int vid;                     /* VLAN number. */

    /* Auxiliary data. */
    char *vlan_dev;             /* sprintf("%s.%d", trunk_dev, vid); */
    struct svec tagged_devs;    /* Name of tagged network device(s). */
};

/* Current set of VLAN devices, indexed two different ways. */
static struct hmap vlans_by_trunk = HMAP_INITIALIZER(&vlans_by_trunk);
static struct shash vlans_by_tagged = SHASH_INITIALIZER(&vlans_by_tagged);

static bool remove_tagged_dev(struct shash_node *, const char *tagged_dev);
static void update_vlan_config(void);
static void set_vlan_proc_file(const struct compat_vlan *);
static uint32_t hash_vlan(const char *trunk_dev, uint32_t vid);

/* Updates the /proc/net/vlan compatibility layer's idea of what trunk device
 * and VLAN the given 'tagged_dev' is associated with.  If 'tagged_dev' has an
 * implicit VLAN tag, then 'trunk_dev' should be the name of a network device
 * on the same bridge that trunks that VLAN, and 'vid' should be the VLAN tag
 * number.  If 'tagged_dev' does not have an implicit VLAN tag, then
 * 'trunk_dev' should be NULL and 'vid' should be -1.
 *
 * This function has no effect unless proc_net_compat_init() has been
 * called. */
void
proc_net_compat_update_vlan(const char *tagged_dev, const char *trunk_dev,
                            int vid)
{
    struct compat_vlan *vlan;
    struct shash_node *node;

    if (!brc_sock) {
        return;
    }

    /* Find the compat_vlan that we currently have for 'tagged_dev' (if
     * any). */
    node = shash_find(&vlans_by_tagged, tagged_dev);
    vlan = node ? node->data : NULL;
    if (vid <= 0 || !trunk_dev) {
        if (vlan) {
            if (remove_tagged_dev(node, tagged_dev)) {
                update_vlan_config();
            }
        }
    } else {
        if (vlan) {
            if (!strcmp(trunk_dev, vlan->trunk_dev) && vid == vlan->vid) {
                /* No change. */
                return;
            } else {
                /* 'tagged_dev' is attached to the wrong compat_vlan.  Start
                 * by removing it from that one. */
                remove_tagged_dev(node, tagged_dev);
                node = NULL;
                vlan = NULL;
            }
        }

        /* 'tagged_dev' is not attached to any compat_vlan.  Find the
         * compat_vlan corresponding to (trunk_dev,vid) to attach it to, or
         * create a new compat_vlan if none exists for (trunk_dev,vid). */
        HMAP_FOR_EACH_WITH_HASH (vlan, struct compat_vlan, trunk_node,
                                 hash_vlan(trunk_dev, vid),
                                 &vlans_by_trunk) {
            if (!strcmp(trunk_dev, vlan->trunk_dev) && vid == vlan->vid) {
                break;
            }
        }
        if (!vlan) {
            /* Create a new compat_vlan for (trunk_dev,vid). */
            vlan = xcalloc(1, sizeof *vlan);
            vlan->trunk_dev = xstrdup(trunk_dev);
            vlan->vid = vid;
            vlan->vlan_dev = xasprintf("%s.%d", trunk_dev, vid);
            svec_init(&vlan->tagged_devs);
            hmap_insert(&vlans_by_trunk, &vlan->trunk_node,
                        hash_vlan(trunk_dev, vid));
            set_vlan_proc_file(vlan);
        }

        /* Attach 'tagged_dev' to 'vlan'. */
        svec_add(&vlan->tagged_devs, tagged_dev);
        shash_add(&vlans_by_tagged, tagged_dev, vlan);
        svec_sort(&vlan->tagged_devs);
        update_vlan_config();
    }
}

/* Remove 'tagged_dev' from the compat_vlan in 'node'.  If that causes the
 * compat_vlan to have no tagged_devs left, destroy the compat_vlan too. */
static bool
remove_tagged_dev(struct shash_node *node, const char *tagged_dev)
{
    struct compat_vlan *vlan = node->data;

    svec_del(&vlan->tagged_devs, tagged_dev);
    shash_delete(&vlans_by_tagged, node);
    if (!vlan->tagged_devs.n) {
        set_proc_file("net/vlan", vlan->vlan_dev, NULL);

        hmap_remove(&vlans_by_trunk, &vlan->trunk_node);
        svec_destroy(&vlan->tagged_devs);
        free(vlan->trunk_dev);
        free(vlan->vlan_dev);
        free(vlan);
        return true;
    }
    return false;
}

/* Returns a hash value for (trunk_dev,vid). */
static uint32_t
hash_vlan(const char *trunk_dev, uint32_t vid)
{
    return hash_int(vid, hash_string(trunk_dev, 0));
}

/* Update /proc/net/vlan/<vlan_dev> for 'vlan'. */
static void
set_vlan_proc_file(const struct compat_vlan *vlan)
{
    struct ds ds;

    ds_init(&ds);
    ds_put_format(
        &ds,
        "%s  VID: %d\t REORDER_HDR: 1  dev->priv_flags: 81\n"
        "         total frames received            0\n"
        "          total bytes received            0\n"
        "      Broadcast/Multicast Rcvd            0\n"
        "\n"
        "      total frames transmitted            0\n"
        "       total bytes transmitted            0\n"
        "            total headroom inc            0\n"
        "           total encap on xmit            0\n"
        "Device: %s\n"
        "INGRESS priority mappings: 0:0  1:0  2:0  3:0  4:0  5:0  6:0 7:0\n"
        "EGRESSS priority Mappings: \n",
        vlan->vlan_dev, vlan->vid, vlan->trunk_dev);
    set_proc_file("net/vlan", vlan->vlan_dev, ds_cstr(&ds));
    ds_destroy(&ds);
}

/* Update /proc/net/vlan/config. */
static void
update_vlan_config(void)
{
    struct compat_vlan *vlan;
    struct ds ds;

    ds_init(&ds);
    ds_put_cstr(&ds, "VLAN Dev name     | VLAN ID\n"
                "Name-Type: VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD\n");
    HMAP_FOR_EACH (vlan, struct compat_vlan, trunk_node, &vlans_by_trunk) {
        ds_put_format(&ds, "%-15s| %d  | %s\n",
                      vlan->vlan_dev, vlan->vid, vlan->trunk_dev);
    }
    set_proc_file("net/vlan", "config", ds_cstr(&ds));
    ds_destroy(&ds);
}
Commit	Line	Data
064af421 BP	1	/* Copyright (c) 2009 Nicira Networks
064af421 BP	2	*
a14bc59f BP	3	* Licensed under the Apache License, Version 2.0 (the "License");
	4	* you may not use this file except in compliance with the License.
	5	* You may obtain a copy of the License at:
064af421	6	*
a14bc59f	7	* http://www.apache.org/licenses/LICENSE-2.0
064af421	8	*
a14bc59f BP	9	* Unless required by applicable law or agreed to in writing, software
	10	* distributed under the License is distributed on an "AS IS" BASIS,
	11	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	12	* See the License for the specific language governing permissions and
	13	* limitations under the License.
064af421 BP	14	*/
	15
	16	#include <config.h>
	17	#include "proc-net-compat.h"
	18	#include <assert.h>
	19	#include <dirent.h>
	20	#include <errno.h>
	21	#include <inttypes.h>
	22	#include <string.h>
	23	#include "dynamic-string.h"
	24	#include "hash.h"
	25	#include "netlink-protocol.h"
	26	#include "netlink.h"
	27	#include "ofpbuf.h"
	28	#include "openvswitch/brcompat-netlink.h"
	29	#include "hmap.h"
	30	#include "shash.h"
	31	#include "svec.h"
	32
	33	#define THIS_MODULE VLM_proc_net_compat
	34	#include "vlog.h"
	35
	36	/* Netlink socket to bridge compatibility kernel module. */
	37	static struct nl_sock *brc_sock;
	38
	39	/* The Generic Netlink family number used for bridge compatibility. */
	40	static int brc_family = 0;
	41
	42	/* Rate limiting for log messages. */
	43	static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5);
	44
	45	static void flush_dir(const char *dir);
	46	static int set_proc_file(const char dir, const char file, const char *data);
	47
	48	/* Initializes the /proc/net compatibility layer. Returns 0 if successful,
	49	* otherwise a positive errno value. */
	50	int
	51	proc_net_compat_init(void)
	52	{
	53	if (!brc_sock) {
	54	int retval = nl_lookup_genl_family(BRC_GENL_FAMILY_NAME, &brc_family);
	55	if (retval) {
	56	return retval;
	57	}
	58
	59	retval = nl_sock_create(NETLINK_GENERIC, 0, 0, 0, &brc_sock);
	60	if (retval) {
	61	return retval;
	62	}
	63
	64	flush_dir("/proc/net/vlan");
	65	flush_dir("/proc/net/bonding");
	66	}
	67	return 0;
	68	}
	69
	70	static int
	71	set_proc_file(const char dir, const char file, const char *data)
	72	{
	73	struct ofpbuf request, *reply;
	74	int retval;
	75
	76	ofpbuf_init(&request, 0);
	77	nl_msg_put_genlmsghdr(&request, brc_sock, 1024, brc_family, NLM_F_REQUEST,
78	BRC_GENL_C_SET_PROC, 1);
79	nl_msg_put_string(&request, BRC_GENL_A_PROC_DIR, dir);
80	nl_msg_put_string(&request, BRC_GENL_A_PROC_NAME, file);
81	if (data) {
82	nl_msg_put_string(&request, BRC_GENL_A_PROC_DATA, data);
83	}
84
85	retval = nl_sock_transact(brc_sock, &request, &reply);
86	ofpbuf_uninit(&request);
87	ofpbuf_delete(reply);
88	if (retval) {
89	VLOG_WARN_RL(&rl, "failed to %s /proc/%s/%s (%s)",
90	data ? "update" : "remove", dir, file, strerror(retval));
91	}
92	return retval;
93	}
94
95	static void
96	flush_dir(const char *dir)
97	{
98	const char *subdir;
99	struct dirent *de;
100	DIR *stream;
101
102	assert(!memcmp(dir, "/proc/", 6));
103	subdir = dir + 6;
104
105	stream = opendir(dir);
106	if (!stream) {
107	if (errno != ENOENT) {
108	VLOG_WARN_RL(&rl, "%s: open failed (%s)", dir, strerror(errno));
109	}
110	return;
111	}
112
113	while ((de = readdir(stream)) != NULL) {
114	if (strcmp(de->d_name, ".") && strcmp(de->d_name, "..")) {
115	set_proc_file(subdir, de->d_name, NULL);
116	}
117	}
118	closedir(stream);
119	}
120	\f
121	/* If 'bond' is nonnull, creates a file in /proc/net/bonding for a bond with
122	* the given 'name' and the details in 'bond'. If 'bond' is null, deletes
123	* the /proc/net/bonding file with the given 'name'.
124	*
125	* This function has no effect unless proc_net_compat_init() has been
126	* called. */
127	void
128	proc_net_compat_update_bond(const char name, const struct compat_bond bond)
129	{
130	struct ds ds;
131	int i;
132
133	if (!brc_sock) {
134	return;
135	}
136
137	if (!bond) {
138	set_proc_file("net/bonding", name, NULL);
139	return;
140	}
141
142	ds_init(&ds);
143	ds_put_format(
144	&ds,
145	"Ethernet Channel Bonding Driver: ovs-vswitchd "
146	VERSION BUILDNR" ("__DATE__" "__TIME__")\n"
147	"Bonding Mode: source load balancing\n"
148	"Primary Slave: None\n"
149	"Currently Active Slave: None\n"
150	"MII Status: %s\n"
151	"MII Polling Interval (ms): 100\n"
152	"Up Delay (ms): %d\n"
153	"Down Delay (ms): %d\n"
154	"\n"
155	"Source load balancing info:\n",
156	bond->up ? "up" : "down", bond->updelay, bond->downdelay);
2aebae83 BP	157
	158	for (i = 0; i < bond->n_hashes; i++) {
	159	const struct compat_bond_hash *cbh = &bond->hashes[i];
	160	ds_put_format(&ds, " [%03d] = %s\n", cbh->hash, cbh->netdev_name);
	161	}
	162
064af421 BP	163	for (i = 0; i < bond->n_slaves; i++) {
	164	const struct compat_bond_slave *slave = &bond->slaves[i];
	165	ds_put_format(
	166	&ds,
	167	"\n"
	168	"Slave Interface: %s\n"
	169	"MII Status: %s\n"
	170	"Link Failure Count: 0\n"
	171	"Permanent HW addr: "ETH_ADDR_FMT"\n",
	172	slave->name, slave->up ? "up" : "down",
	173	ETH_ADDR_ARGS(slave->mac));
	174	}
	175	set_proc_file("net/bonding", name, ds_cstr(&ds));
	176	ds_destroy(&ds);
	177	}
	178	\f
	179	/* /proc/net/vlan compatibility.
	180	*
	181	* This is much more complex than I expected it to be. */
	182
	183	struct compat_vlan {
	184	/* Hash key. */
	185	struct hmap_node trunk_node; /* Hash map node. */
	186	char trunk_dev; / Name of trunk network device. */
	187	int vid; /* VLAN number. */
	188
	189	/* Auxiliary data. */
	190	char vlan_dev; / sprintf("%s.%d", trunk_dev, vid); */
	191	struct svec tagged_devs; /* Name of tagged network device(s). */
	192	};
	193
	194	/* Current set of VLAN devices, indexed two different ways. */
	195	static struct hmap vlans_by_trunk = HMAP_INITIALIZER(&vlans_by_trunk);
	196	static struct shash vlans_by_tagged = SHASH_INITIALIZER(&vlans_by_tagged);
	197
	198	static bool remove_tagged_dev(struct shash_node , const char tagged_dev);
	199	static void update_vlan_config(void);
	200	static void set_vlan_proc_file(const struct compat_vlan *);
	201	static uint32_t hash_vlan(const char *trunk_dev, uint32_t vid);
	202
	203	/* Updates the /proc/net/vlan compatibility layer's idea of what trunk device
	204	* and VLAN the given 'tagged_dev' is associated with. If 'tagged_dev' has an
	205	* implicit VLAN tag, then 'trunk_dev' should be the name of a network device
	206	* on the same bridge that trunks that VLAN, and 'vid' should be the VLAN tag
	207	* number. If 'tagged_dev' does not have an implicit VLAN tag, then
	208	* 'trunk_dev' should be NULL and 'vid' should be -1.
	209	*
	210	* This function has no effect unless proc_net_compat_init() has been
	211	* called. */
	212	void
	213	proc_net_compat_update_vlan(const char tagged_dev, const char trunk_dev,
	214	int vid)
	215	{
	216	struct compat_vlan *vlan;
	217	struct shash_node *node;
	218
	219	if (!brc_sock) {
	220	return;
	221	}
	222
	223	/* Find the compat_vlan that we currently have for 'tagged_dev' (if
	224	* any). */
	225	node = shash_find(&vlans_by_tagged, tagged_dev);
	226	vlan = node ? node->data : NULL;
227	if (vid <= 0 \|\| !trunk_dev) {
228	if (vlan) {
229	if (remove_tagged_dev(node, tagged_dev)) {
230	update_vlan_config();
231	}
232	}
233	} else {
234	if (vlan) {
235	if (!strcmp(trunk_dev, vlan->trunk_dev) && vid == vlan->vid) {
236	/* No change. */
237	return;
238	} else {
239	/* 'tagged_dev' is attached to the wrong compat_vlan. Start
240	* by removing it from that one. */
241	remove_tagged_dev(node, tagged_dev);
242	node = NULL;
243	vlan = NULL;
244	}
245	}
246
247	/* 'tagged_dev' is not attached to any compat_vlan. Find the
248	* compat_vlan corresponding to (trunk_dev,vid) to attach it to, or
249	* create a new compat_vlan if none exists for (trunk_dev,vid). */
250	HMAP_FOR_EACH_WITH_HASH (vlan, struct compat_vlan, trunk_node,
251	hash_vlan(trunk_dev, vid),
252	&vlans_by_trunk) {
253	if (!strcmp(trunk_dev, vlan->trunk_dev) && vid == vlan->vid) {
254	break;
255	}
256	}
257	if (!vlan) {
258	/* Create a new compat_vlan for (trunk_dev,vid). */
259	vlan = xcalloc(1, sizeof *vlan);
260	vlan->trunk_dev = xstrdup(trunk_dev);
261	vlan->vid = vid;
262	vlan->vlan_dev = xasprintf("%s.%d", trunk_dev, vid);
263	svec_init(&vlan->tagged_devs);
264	hmap_insert(&vlans_by_trunk, &vlan->trunk_node,
265	hash_vlan(trunk_dev, vid));
266	set_vlan_proc_file(vlan);
267	}
268
269	/* Attach 'tagged_dev' to 'vlan'. */
270	svec_add(&vlan->tagged_devs, tagged_dev);
271	shash_add(&vlans_by_tagged, tagged_dev, vlan);
272	svec_sort(&vlan->tagged_devs);
273	update_vlan_config();
274	}
275	}
276
277	/* Remove 'tagged_dev' from the compat_vlan in 'node'. If that causes the
278	* compat_vlan to have no tagged_devs left, destroy the compat_vlan too. */
279	static bool
280	remove_tagged_dev(struct shash_node node, const char tagged_dev)
281	{
282	struct compat_vlan *vlan = node->data;
283
284	svec_del(&vlan->tagged_devs, tagged_dev);
285	shash_delete(&vlans_by_tagged, node);
286	if (!vlan->tagged_devs.n) {
287	set_proc_file("net/vlan", vlan->vlan_dev, NULL);
288
289	hmap_remove(&vlans_by_trunk, &vlan->trunk_node);
290	svec_destroy(&vlan->tagged_devs);
291	free(vlan->trunk_dev);
292	free(vlan->vlan_dev);
293	free(vlan);
294	return true;
295	}
296	return false;
297	}
298
299	/* Returns a hash value for (trunk_dev,vid). */
300	static uint32_t
301	hash_vlan(const char *trunk_dev, uint32_t vid)
302	{
303	return hash_int(vid, hash_string(trunk_dev, 0));
304	}
305
306	/* Update /proc/net/vlan/<vlan_dev> for 'vlan'. */
307	static void
308	set_vlan_proc_file(const struct compat_vlan *vlan)
309	{
310	struct ds ds;
311
312	ds_init(&ds);
313	ds_put_format(
314	&ds,
315	"%s VID: %d\t REORDER_HDR: 1 dev->priv_flags: 81\n"
316	" total frames received 0\n"
317	" total bytes received 0\n"
318	" Broadcast/Multicast Rcvd 0\n"
319	"\n"
320	" total frames transmitted 0\n"
321	" total bytes transmitted 0\n"
322	" total headroom inc 0\n"
323	" total encap on xmit 0\n"
324	"Device: %s\n"
325	"INGRESS priority mappings: 0:0 1:0 2:0 3:0 4:0 5:0 6:0 7:0\n"
326	"EGRESSS priority Mappings: \n",
327	vlan->vlan_dev, vlan->vid, vlan->trunk_dev);
328	set_proc_file("net/vlan", vlan->vlan_dev, ds_cstr(&ds));
329	ds_destroy(&ds);
330	}
331
332	/* Update /proc/net/vlan/config. */
333	static void
334	update_vlan_config(void)
335	{
336	struct compat_vlan *vlan;
337	struct ds ds;
338
339	ds_init(&ds);
340	ds_put_cstr(&ds, "VLAN Dev name \| VLAN ID\n"
341	"Name-Type: VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD\n");
342	HMAP_FOR_EACH (vlan, struct compat_vlan, trunk_node, &vlans_by_trunk) {
343	ds_put_format(&ds, "%-15s\| %d \| %s\n",
344	vlan->vlan_dev, vlan->vid, vlan->trunk_dev);
345	}
346	set_proc_file("net/vlan", "config", ds_cstr(&ds));
347	ds_destroy(&ds);
348	}