769 lines
18 KiB
C
769 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (c) 2017 Nicira, Inc.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/if.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/ip.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/openvswitch.h>
|
|
#include <linux/netlink.h>
|
|
#include <linux/rculist.h>
|
|
|
|
#include <net/netlink.h>
|
|
#include <net/genetlink.h>
|
|
|
|
#include "datapath.h"
|
|
#include "meter.h"
|
|
|
|
static const struct nla_policy meter_policy[OVS_METER_ATTR_MAX + 1] = {
|
|
[OVS_METER_ATTR_ID] = { .type = NLA_U32, },
|
|
[OVS_METER_ATTR_KBPS] = { .type = NLA_FLAG },
|
|
[OVS_METER_ATTR_STATS] = { .len = sizeof(struct ovs_flow_stats) },
|
|
[OVS_METER_ATTR_BANDS] = { .type = NLA_NESTED },
|
|
[OVS_METER_ATTR_USED] = { .type = NLA_U64 },
|
|
[OVS_METER_ATTR_CLEAR] = { .type = NLA_FLAG },
|
|
[OVS_METER_ATTR_MAX_METERS] = { .type = NLA_U32 },
|
|
[OVS_METER_ATTR_MAX_BANDS] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static const struct nla_policy band_policy[OVS_BAND_ATTR_MAX + 1] = {
|
|
[OVS_BAND_ATTR_TYPE] = { .type = NLA_U32, },
|
|
[OVS_BAND_ATTR_RATE] = { .type = NLA_U32, },
|
|
[OVS_BAND_ATTR_BURST] = { .type = NLA_U32, },
|
|
[OVS_BAND_ATTR_STATS] = { .len = sizeof(struct ovs_flow_stats) },
|
|
};
|
|
|
|
static u32 meter_hash(struct dp_meter_instance *ti, u32 id)
|
|
{
|
|
return id % ti->n_meters;
|
|
}
|
|
|
|
static void ovs_meter_free(struct dp_meter *meter)
|
|
{
|
|
if (!meter)
|
|
return;
|
|
|
|
kfree_rcu(meter, rcu);
|
|
}
|
|
|
|
/* Call with ovs_mutex or RCU read lock. */
|
|
static struct dp_meter *lookup_meter(const struct dp_meter_table *tbl,
|
|
u32 meter_id)
|
|
{
|
|
struct dp_meter_instance *ti = rcu_dereference_ovsl(tbl->ti);
|
|
u32 hash = meter_hash(ti, meter_id);
|
|
struct dp_meter *meter;
|
|
|
|
meter = rcu_dereference_ovsl(ti->dp_meters[hash]);
|
|
if (meter && likely(meter->id == meter_id))
|
|
return meter;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct dp_meter_instance *dp_meter_instance_alloc(const u32 size)
|
|
{
|
|
struct dp_meter_instance *ti;
|
|
|
|
ti = kvzalloc(sizeof(*ti) +
|
|
sizeof(struct dp_meter *) * size,
|
|
GFP_KERNEL);
|
|
if (!ti)
|
|
return NULL;
|
|
|
|
ti->n_meters = size;
|
|
|
|
return ti;
|
|
}
|
|
|
|
static void dp_meter_instance_free(struct dp_meter_instance *ti)
|
|
{
|
|
kvfree(ti);
|
|
}
|
|
|
|
static void dp_meter_instance_free_rcu(struct rcu_head *rcu)
|
|
{
|
|
struct dp_meter_instance *ti;
|
|
|
|
ti = container_of(rcu, struct dp_meter_instance, rcu);
|
|
kvfree(ti);
|
|
}
|
|
|
|
static int
|
|
dp_meter_instance_realloc(struct dp_meter_table *tbl, u32 size)
|
|
{
|
|
struct dp_meter_instance *ti = rcu_dereference_ovsl(tbl->ti);
|
|
int n_meters = min(size, ti->n_meters);
|
|
struct dp_meter_instance *new_ti;
|
|
int i;
|
|
|
|
new_ti = dp_meter_instance_alloc(size);
|
|
if (!new_ti)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < n_meters; i++)
|
|
if (rcu_dereference_ovsl(ti->dp_meters[i]))
|
|
new_ti->dp_meters[i] = ti->dp_meters[i];
|
|
|
|
rcu_assign_pointer(tbl->ti, new_ti);
|
|
call_rcu(&ti->rcu, dp_meter_instance_free_rcu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void dp_meter_instance_insert(struct dp_meter_instance *ti,
|
|
struct dp_meter *meter)
|
|
{
|
|
u32 hash;
|
|
|
|
hash = meter_hash(ti, meter->id);
|
|
rcu_assign_pointer(ti->dp_meters[hash], meter);
|
|
}
|
|
|
|
static void dp_meter_instance_remove(struct dp_meter_instance *ti,
|
|
struct dp_meter *meter)
|
|
{
|
|
u32 hash;
|
|
|
|
hash = meter_hash(ti, meter->id);
|
|
RCU_INIT_POINTER(ti->dp_meters[hash], NULL);
|
|
}
|
|
|
|
static int attach_meter(struct dp_meter_table *tbl, struct dp_meter *meter)
|
|
{
|
|
struct dp_meter_instance *ti = rcu_dereference_ovsl(tbl->ti);
|
|
u32 hash = meter_hash(ti, meter->id);
|
|
int err;
|
|
|
|
/* In generally, slots selected should be empty, because
|
|
* OvS uses id-pool to fetch a available id.
|
|
*/
|
|
if (unlikely(rcu_dereference_ovsl(ti->dp_meters[hash])))
|
|
return -EBUSY;
|
|
|
|
dp_meter_instance_insert(ti, meter);
|
|
|
|
/* That function is thread-safe. */
|
|
tbl->count++;
|
|
if (tbl->count >= tbl->max_meters_allowed) {
|
|
err = -EFBIG;
|
|
goto attach_err;
|
|
}
|
|
|
|
if (tbl->count >= ti->n_meters &&
|
|
dp_meter_instance_realloc(tbl, ti->n_meters * 2)) {
|
|
err = -ENOMEM;
|
|
goto attach_err;
|
|
}
|
|
|
|
return 0;
|
|
|
|
attach_err:
|
|
dp_meter_instance_remove(ti, meter);
|
|
tbl->count--;
|
|
return err;
|
|
}
|
|
|
|
static int detach_meter(struct dp_meter_table *tbl, struct dp_meter *meter)
|
|
{
|
|
struct dp_meter_instance *ti;
|
|
|
|
ASSERT_OVSL();
|
|
if (!meter)
|
|
return 0;
|
|
|
|
ti = rcu_dereference_ovsl(tbl->ti);
|
|
dp_meter_instance_remove(ti, meter);
|
|
|
|
tbl->count--;
|
|
|
|
/* Shrink the meter array if necessary. */
|
|
if (ti->n_meters > DP_METER_ARRAY_SIZE_MIN &&
|
|
tbl->count <= (ti->n_meters / 4)) {
|
|
int half_size = ti->n_meters / 2;
|
|
int i;
|
|
|
|
/* Avoid hash collision, don't move slots to other place.
|
|
* Make sure there are no references of meters in array
|
|
* which will be released.
|
|
*/
|
|
for (i = half_size; i < ti->n_meters; i++)
|
|
if (rcu_dereference_ovsl(ti->dp_meters[i]))
|
|
goto out;
|
|
|
|
if (dp_meter_instance_realloc(tbl, half_size))
|
|
goto shrink_err;
|
|
}
|
|
|
|
out:
|
|
return 0;
|
|
|
|
shrink_err:
|
|
dp_meter_instance_insert(ti, meter);
|
|
tbl->count++;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static struct sk_buff *
|
|
ovs_meter_cmd_reply_start(struct genl_info *info, u8 cmd,
|
|
struct ovs_header **ovs_reply_header)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct ovs_header *ovs_header = info->userhdr;
|
|
|
|
skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
|
|
if (!skb)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
*ovs_reply_header = genlmsg_put(skb, info->snd_portid,
|
|
info->snd_seq,
|
|
&dp_meter_genl_family, 0, cmd);
|
|
if (!*ovs_reply_header) {
|
|
nlmsg_free(skb);
|
|
return ERR_PTR(-EMSGSIZE);
|
|
}
|
|
(*ovs_reply_header)->dp_ifindex = ovs_header->dp_ifindex;
|
|
|
|
return skb;
|
|
}
|
|
|
|
static int ovs_meter_cmd_reply_stats(struct sk_buff *reply, u32 meter_id,
|
|
struct dp_meter *meter)
|
|
{
|
|
struct nlattr *nla;
|
|
struct dp_meter_band *band;
|
|
u16 i;
|
|
|
|
if (nla_put_u32(reply, OVS_METER_ATTR_ID, meter_id))
|
|
goto error;
|
|
|
|
if (nla_put(reply, OVS_METER_ATTR_STATS,
|
|
sizeof(struct ovs_flow_stats), &meter->stats))
|
|
goto error;
|
|
|
|
if (nla_put_u64_64bit(reply, OVS_METER_ATTR_USED, meter->used,
|
|
OVS_METER_ATTR_PAD))
|
|
goto error;
|
|
|
|
nla = nla_nest_start_noflag(reply, OVS_METER_ATTR_BANDS);
|
|
if (!nla)
|
|
goto error;
|
|
|
|
band = meter->bands;
|
|
|
|
for (i = 0; i < meter->n_bands; ++i, ++band) {
|
|
struct nlattr *band_nla;
|
|
|
|
band_nla = nla_nest_start_noflag(reply, OVS_BAND_ATTR_UNSPEC);
|
|
if (!band_nla || nla_put(reply, OVS_BAND_ATTR_STATS,
|
|
sizeof(struct ovs_flow_stats),
|
|
&band->stats))
|
|
goto error;
|
|
nla_nest_end(reply, band_nla);
|
|
}
|
|
nla_nest_end(reply, nla);
|
|
|
|
return 0;
|
|
error:
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int ovs_meter_cmd_features(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct ovs_header *ovs_header = info->userhdr;
|
|
struct ovs_header *ovs_reply_header;
|
|
struct nlattr *nla, *band_nla;
|
|
struct sk_buff *reply;
|
|
struct datapath *dp;
|
|
int err = -EMSGSIZE;
|
|
|
|
reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_FEATURES,
|
|
&ovs_reply_header);
|
|
if (IS_ERR(reply))
|
|
return PTR_ERR(reply);
|
|
|
|
ovs_lock();
|
|
dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
|
|
if (!dp) {
|
|
err = -ENODEV;
|
|
goto exit_unlock;
|
|
}
|
|
|
|
if (nla_put_u32(reply, OVS_METER_ATTR_MAX_METERS,
|
|
dp->meter_tbl.max_meters_allowed))
|
|
goto exit_unlock;
|
|
|
|
ovs_unlock();
|
|
|
|
if (nla_put_u32(reply, OVS_METER_ATTR_MAX_BANDS, DP_MAX_BANDS))
|
|
goto nla_put_failure;
|
|
|
|
nla = nla_nest_start_noflag(reply, OVS_METER_ATTR_BANDS);
|
|
if (!nla)
|
|
goto nla_put_failure;
|
|
|
|
band_nla = nla_nest_start_noflag(reply, OVS_BAND_ATTR_UNSPEC);
|
|
if (!band_nla)
|
|
goto nla_put_failure;
|
|
/* Currently only DROP band type is supported. */
|
|
if (nla_put_u32(reply, OVS_BAND_ATTR_TYPE, OVS_METER_BAND_TYPE_DROP))
|
|
goto nla_put_failure;
|
|
nla_nest_end(reply, band_nla);
|
|
nla_nest_end(reply, nla);
|
|
|
|
genlmsg_end(reply, ovs_reply_header);
|
|
return genlmsg_reply(reply, info);
|
|
|
|
exit_unlock:
|
|
ovs_unlock();
|
|
nla_put_failure:
|
|
nlmsg_free(reply);
|
|
return err;
|
|
}
|
|
|
|
static struct dp_meter *dp_meter_create(struct nlattr **a)
|
|
{
|
|
struct nlattr *nla;
|
|
int rem;
|
|
u16 n_bands = 0;
|
|
struct dp_meter *meter;
|
|
struct dp_meter_band *band;
|
|
int err;
|
|
|
|
/* Validate attributes, count the bands. */
|
|
if (!a[OVS_METER_ATTR_BANDS])
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
nla_for_each_nested(nla, a[OVS_METER_ATTR_BANDS], rem)
|
|
if (++n_bands > DP_MAX_BANDS)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
/* Allocate and set up the meter before locking anything. */
|
|
meter = kzalloc(struct_size(meter, bands, n_bands), GFP_KERNEL_ACCOUNT);
|
|
if (!meter)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
meter->id = nla_get_u32(a[OVS_METER_ATTR_ID]);
|
|
meter->used = div_u64(ktime_get_ns(), 1000 * 1000);
|
|
meter->kbps = a[OVS_METER_ATTR_KBPS] ? 1 : 0;
|
|
meter->keep_stats = !a[OVS_METER_ATTR_CLEAR];
|
|
spin_lock_init(&meter->lock);
|
|
if (meter->keep_stats && a[OVS_METER_ATTR_STATS]) {
|
|
meter->stats = *(struct ovs_flow_stats *)
|
|
nla_data(a[OVS_METER_ATTR_STATS]);
|
|
}
|
|
meter->n_bands = n_bands;
|
|
|
|
/* Set up meter bands. */
|
|
band = meter->bands;
|
|
nla_for_each_nested(nla, a[OVS_METER_ATTR_BANDS], rem) {
|
|
struct nlattr *attr[OVS_BAND_ATTR_MAX + 1];
|
|
u32 band_max_delta_t;
|
|
|
|
err = nla_parse_deprecated((struct nlattr **)&attr,
|
|
OVS_BAND_ATTR_MAX, nla_data(nla),
|
|
nla_len(nla), band_policy, NULL);
|
|
if (err)
|
|
goto exit_free_meter;
|
|
|
|
if (!attr[OVS_BAND_ATTR_TYPE] ||
|
|
!attr[OVS_BAND_ATTR_RATE] ||
|
|
!attr[OVS_BAND_ATTR_BURST]) {
|
|
err = -EINVAL;
|
|
goto exit_free_meter;
|
|
}
|
|
|
|
band->type = nla_get_u32(attr[OVS_BAND_ATTR_TYPE]);
|
|
band->rate = nla_get_u32(attr[OVS_BAND_ATTR_RATE]);
|
|
if (band->rate == 0) {
|
|
err = -EINVAL;
|
|
goto exit_free_meter;
|
|
}
|
|
|
|
band->burst_size = nla_get_u32(attr[OVS_BAND_ATTR_BURST]);
|
|
/* Figure out max delta_t that is enough to fill any bucket.
|
|
* Keep max_delta_t size to the bucket units:
|
|
* pkts => 1/1000 packets, kilobits => bits.
|
|
*
|
|
* Start with a full bucket.
|
|
*/
|
|
band->bucket = band->burst_size * 1000ULL;
|
|
band_max_delta_t = div_u64(band->bucket, band->rate);
|
|
if (band_max_delta_t > meter->max_delta_t)
|
|
meter->max_delta_t = band_max_delta_t;
|
|
band++;
|
|
}
|
|
|
|
return meter;
|
|
|
|
exit_free_meter:
|
|
kfree(meter);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct nlattr **a = info->attrs;
|
|
struct dp_meter *meter, *old_meter;
|
|
struct sk_buff *reply;
|
|
struct ovs_header *ovs_reply_header;
|
|
struct ovs_header *ovs_header = info->userhdr;
|
|
struct dp_meter_table *meter_tbl;
|
|
struct datapath *dp;
|
|
int err;
|
|
u32 meter_id;
|
|
bool failed;
|
|
|
|
if (!a[OVS_METER_ATTR_ID])
|
|
return -EINVAL;
|
|
|
|
meter = dp_meter_create(a);
|
|
if (IS_ERR(meter))
|
|
return PTR_ERR(meter);
|
|
|
|
reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_SET,
|
|
&ovs_reply_header);
|
|
if (IS_ERR(reply)) {
|
|
err = PTR_ERR(reply);
|
|
goto exit_free_meter;
|
|
}
|
|
|
|
ovs_lock();
|
|
dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
|
|
if (!dp) {
|
|
err = -ENODEV;
|
|
goto exit_unlock;
|
|
}
|
|
|
|
meter_tbl = &dp->meter_tbl;
|
|
meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]);
|
|
|
|
old_meter = lookup_meter(meter_tbl, meter_id);
|
|
err = detach_meter(meter_tbl, old_meter);
|
|
if (err)
|
|
goto exit_unlock;
|
|
|
|
err = attach_meter(meter_tbl, meter);
|
|
if (err)
|
|
goto exit_free_old_meter;
|
|
|
|
ovs_unlock();
|
|
|
|
/* Build response with the meter_id and stats from
|
|
* the old meter, if any.
|
|
*/
|
|
failed = nla_put_u32(reply, OVS_METER_ATTR_ID, meter_id);
|
|
WARN_ON(failed);
|
|
if (old_meter) {
|
|
spin_lock_bh(&old_meter->lock);
|
|
if (old_meter->keep_stats) {
|
|
err = ovs_meter_cmd_reply_stats(reply, meter_id,
|
|
old_meter);
|
|
WARN_ON(err);
|
|
}
|
|
spin_unlock_bh(&old_meter->lock);
|
|
ovs_meter_free(old_meter);
|
|
}
|
|
|
|
genlmsg_end(reply, ovs_reply_header);
|
|
return genlmsg_reply(reply, info);
|
|
|
|
exit_free_old_meter:
|
|
ovs_meter_free(old_meter);
|
|
exit_unlock:
|
|
ovs_unlock();
|
|
nlmsg_free(reply);
|
|
exit_free_meter:
|
|
kfree(meter);
|
|
return err;
|
|
}
|
|
|
|
static int ovs_meter_cmd_get(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct ovs_header *ovs_header = info->userhdr;
|
|
struct ovs_header *ovs_reply_header;
|
|
struct nlattr **a = info->attrs;
|
|
struct dp_meter *meter;
|
|
struct sk_buff *reply;
|
|
struct datapath *dp;
|
|
u32 meter_id;
|
|
int err;
|
|
|
|
if (!a[OVS_METER_ATTR_ID])
|
|
return -EINVAL;
|
|
|
|
meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]);
|
|
|
|
reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_GET,
|
|
&ovs_reply_header);
|
|
if (IS_ERR(reply))
|
|
return PTR_ERR(reply);
|
|
|
|
ovs_lock();
|
|
|
|
dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
|
|
if (!dp) {
|
|
err = -ENODEV;
|
|
goto exit_unlock;
|
|
}
|
|
|
|
/* Locate meter, copy stats. */
|
|
meter = lookup_meter(&dp->meter_tbl, meter_id);
|
|
if (!meter) {
|
|
err = -ENOENT;
|
|
goto exit_unlock;
|
|
}
|
|
|
|
spin_lock_bh(&meter->lock);
|
|
err = ovs_meter_cmd_reply_stats(reply, meter_id, meter);
|
|
spin_unlock_bh(&meter->lock);
|
|
if (err)
|
|
goto exit_unlock;
|
|
|
|
ovs_unlock();
|
|
|
|
genlmsg_end(reply, ovs_reply_header);
|
|
return genlmsg_reply(reply, info);
|
|
|
|
exit_unlock:
|
|
ovs_unlock();
|
|
nlmsg_free(reply);
|
|
return err;
|
|
}
|
|
|
|
static int ovs_meter_cmd_del(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct ovs_header *ovs_header = info->userhdr;
|
|
struct ovs_header *ovs_reply_header;
|
|
struct nlattr **a = info->attrs;
|
|
struct dp_meter *old_meter;
|
|
struct sk_buff *reply;
|
|
struct datapath *dp;
|
|
u32 meter_id;
|
|
int err;
|
|
|
|
if (!a[OVS_METER_ATTR_ID])
|
|
return -EINVAL;
|
|
|
|
reply = ovs_meter_cmd_reply_start(info, OVS_METER_CMD_DEL,
|
|
&ovs_reply_header);
|
|
if (IS_ERR(reply))
|
|
return PTR_ERR(reply);
|
|
|
|
ovs_lock();
|
|
|
|
dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
|
|
if (!dp) {
|
|
err = -ENODEV;
|
|
goto exit_unlock;
|
|
}
|
|
|
|
meter_id = nla_get_u32(a[OVS_METER_ATTR_ID]);
|
|
old_meter = lookup_meter(&dp->meter_tbl, meter_id);
|
|
if (old_meter) {
|
|
spin_lock_bh(&old_meter->lock);
|
|
err = ovs_meter_cmd_reply_stats(reply, meter_id, old_meter);
|
|
WARN_ON(err);
|
|
spin_unlock_bh(&old_meter->lock);
|
|
|
|
err = detach_meter(&dp->meter_tbl, old_meter);
|
|
if (err)
|
|
goto exit_unlock;
|
|
}
|
|
|
|
ovs_unlock();
|
|
ovs_meter_free(old_meter);
|
|
genlmsg_end(reply, ovs_reply_header);
|
|
return genlmsg_reply(reply, info);
|
|
|
|
exit_unlock:
|
|
ovs_unlock();
|
|
nlmsg_free(reply);
|
|
return err;
|
|
}
|
|
|
|
/* Meter action execution.
|
|
*
|
|
* Return true 'meter_id' drop band is triggered. The 'skb' should be
|
|
* dropped by the caller'.
|
|
*/
|
|
bool ovs_meter_execute(struct datapath *dp, struct sk_buff *skb,
|
|
struct sw_flow_key *key, u32 meter_id)
|
|
{
|
|
long long int now_ms = div_u64(ktime_get_ns(), 1000 * 1000);
|
|
long long int long_delta_ms;
|
|
struct dp_meter_band *band;
|
|
struct dp_meter *meter;
|
|
int i, band_exceeded_max = -1;
|
|
u32 band_exceeded_rate = 0;
|
|
u32 delta_ms;
|
|
u32 cost;
|
|
|
|
meter = lookup_meter(&dp->meter_tbl, meter_id);
|
|
/* Do not drop the packet when there is no meter. */
|
|
if (!meter)
|
|
return false;
|
|
|
|
/* Lock the meter while using it. */
|
|
spin_lock(&meter->lock);
|
|
|
|
long_delta_ms = (now_ms - meter->used); /* ms */
|
|
if (long_delta_ms < 0) {
|
|
/* This condition means that we have several threads fighting
|
|
* for a meter lock, and the one who received the packets a
|
|
* bit later wins. Assuming that all racing threads received
|
|
* packets at the same time to avoid overflow.
|
|
*/
|
|
long_delta_ms = 0;
|
|
}
|
|
|
|
/* Make sure delta_ms will not be too large, so that bucket will not
|
|
* wrap around below.
|
|
*/
|
|
delta_ms = (long_delta_ms > (long long int)meter->max_delta_t)
|
|
? meter->max_delta_t : (u32)long_delta_ms;
|
|
|
|
/* Update meter statistics.
|
|
*/
|
|
meter->used = now_ms;
|
|
meter->stats.n_packets += 1;
|
|
meter->stats.n_bytes += skb->len;
|
|
|
|
/* Bucket rate is either in kilobits per second, or in packets per
|
|
* second. We maintain the bucket in the units of either bits or
|
|
* 1/1000th of a packet, correspondingly.
|
|
* Then, when rate is multiplied with milliseconds, we get the
|
|
* bucket units:
|
|
* msec * kbps = bits, and
|
|
* msec * packets/sec = 1/1000 packets.
|
|
*
|
|
* 'cost' is the number of bucket units in this packet.
|
|
*/
|
|
cost = (meter->kbps) ? skb->len * 8 : 1000;
|
|
|
|
/* Update all bands and find the one hit with the highest rate. */
|
|
for (i = 0; i < meter->n_bands; ++i) {
|
|
long long int max_bucket_size;
|
|
|
|
band = &meter->bands[i];
|
|
max_bucket_size = band->burst_size * 1000LL;
|
|
|
|
band->bucket += delta_ms * band->rate;
|
|
if (band->bucket > max_bucket_size)
|
|
band->bucket = max_bucket_size;
|
|
|
|
if (band->bucket >= cost) {
|
|
band->bucket -= cost;
|
|
} else if (band->rate > band_exceeded_rate) {
|
|
band_exceeded_rate = band->rate;
|
|
band_exceeded_max = i;
|
|
}
|
|
}
|
|
|
|
if (band_exceeded_max >= 0) {
|
|
/* Update band statistics. */
|
|
band = &meter->bands[band_exceeded_max];
|
|
band->stats.n_packets += 1;
|
|
band->stats.n_bytes += skb->len;
|
|
|
|
/* Drop band triggered, let the caller drop the 'skb'. */
|
|
if (band->type == OVS_METER_BAND_TYPE_DROP) {
|
|
spin_unlock(&meter->lock);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
spin_unlock(&meter->lock);
|
|
return false;
|
|
}
|
|
|
|
static const struct genl_small_ops dp_meter_genl_ops[] = {
|
|
{ .cmd = OVS_METER_CMD_FEATURES,
|
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
|
.flags = 0, /* OK for unprivileged users. */
|
|
.doit = ovs_meter_cmd_features
|
|
},
|
|
{ .cmd = OVS_METER_CMD_SET,
|
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
|
.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN
|
|
* privilege.
|
|
*/
|
|
.doit = ovs_meter_cmd_set,
|
|
},
|
|
{ .cmd = OVS_METER_CMD_GET,
|
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
|
.flags = 0, /* OK for unprivileged users. */
|
|
.doit = ovs_meter_cmd_get,
|
|
},
|
|
{ .cmd = OVS_METER_CMD_DEL,
|
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
|
.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN
|
|
* privilege.
|
|
*/
|
|
.doit = ovs_meter_cmd_del
|
|
},
|
|
};
|
|
|
|
static const struct genl_multicast_group ovs_meter_multicast_group = {
|
|
.name = OVS_METER_MCGROUP,
|
|
};
|
|
|
|
struct genl_family dp_meter_genl_family __ro_after_init = {
|
|
.hdrsize = sizeof(struct ovs_header),
|
|
.name = OVS_METER_FAMILY,
|
|
.version = OVS_METER_VERSION,
|
|
.maxattr = OVS_METER_ATTR_MAX,
|
|
.policy = meter_policy,
|
|
.netnsok = true,
|
|
.parallel_ops = true,
|
|
.small_ops = dp_meter_genl_ops,
|
|
.n_small_ops = ARRAY_SIZE(dp_meter_genl_ops),
|
|
.resv_start_op = OVS_METER_CMD_GET + 1,
|
|
.mcgrps = &ovs_meter_multicast_group,
|
|
.n_mcgrps = 1,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
int ovs_meters_init(struct datapath *dp)
|
|
{
|
|
struct dp_meter_table *tbl = &dp->meter_tbl;
|
|
struct dp_meter_instance *ti;
|
|
unsigned long free_mem_bytes;
|
|
|
|
ti = dp_meter_instance_alloc(DP_METER_ARRAY_SIZE_MIN);
|
|
if (!ti)
|
|
return -ENOMEM;
|
|
|
|
/* Allow meters in a datapath to use ~3.12% of physical memory. */
|
|
free_mem_bytes = nr_free_buffer_pages() * (PAGE_SIZE >> 5);
|
|
tbl->max_meters_allowed = min(free_mem_bytes / sizeof(struct dp_meter),
|
|
DP_METER_NUM_MAX);
|
|
if (!tbl->max_meters_allowed)
|
|
goto out_err;
|
|
|
|
rcu_assign_pointer(tbl->ti, ti);
|
|
tbl->count = 0;
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
dp_meter_instance_free(ti);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
void ovs_meters_exit(struct datapath *dp)
|
|
{
|
|
struct dp_meter_table *tbl = &dp->meter_tbl;
|
|
struct dp_meter_instance *ti = rcu_dereference_raw(tbl->ti);
|
|
int i;
|
|
|
|
for (i = 0; i < ti->n_meters; i++)
|
|
ovs_meter_free(rcu_dereference_raw(ti->dp_meters[i]));
|
|
|
|
dp_meter_instance_free(ti);
|
|
}
|