blob: 9ee622fb1160fe5de8df9a5fca0c9a412e40e31a [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* net/sched/act_api.c Packet action API.
*
* Author: Jamal Hadi Salim
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/err.h>
#include <linux/module.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/sch_generic.h>
#include <net/pkt_cls.h>
#include <net/tc_act/tc_pedit.h>
#include <net/act_api.h>
#include <net/netlink.h>
#include <net/flow_offload.h>
#include <net/tc_wrapper.h>
#ifdef CONFIG_INET
DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
EXPORT_SYMBOL_GPL(tcf_frag_xmit_count);
#endif
int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb))
{
#ifdef CONFIG_INET
if (static_branch_unlikely(&tcf_frag_xmit_count))
return sch_frag_xmit_hook(skb, xmit);
#endif
return xmit(skb);
}
EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit);
static void tcf_action_goto_chain_exec(const struct tc_action *a,
struct tcf_result *res)
{
const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
res->goto_tp = rcu_dereference_bh(chain->filter_chain);
}
static void tcf_free_cookie_rcu(struct rcu_head *p)
{
struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
kfree(cookie->data);
kfree(cookie);
}
static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
struct tc_cookie *new_cookie)
{
struct tc_cookie *old;
old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
if (old)
call_rcu(&old->rcu, tcf_free_cookie_rcu);
}
int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
struct tcf_chain **newchain,
struct netlink_ext_ack *extack)
{
int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
u32 chain_index;
if (!opcode)
ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
ret = 0;
if (ret) {
NL_SET_ERR_MSG(extack, "invalid control action");
goto end;
}
if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
chain_index = action & TC_ACT_EXT_VAL_MASK;
if (!tp || !newchain) {
ret = -EINVAL;
NL_SET_ERR_MSG(extack,
"can't goto NULL proto/chain");
goto end;
}
*newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
if (!*newchain) {
ret = -ENOMEM;
NL_SET_ERR_MSG(extack,
"can't allocate goto_chain");
}
}
end:
return ret;
}
EXPORT_SYMBOL(tcf_action_check_ctrlact);
struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
struct tcf_chain *goto_chain)
{
a->tcfa_action = action;
goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
return goto_chain;
}
EXPORT_SYMBOL(tcf_action_set_ctrlact);
/* XXX: For standalone actions, we don't need a RCU grace period either, because
* actions are always connected to filters and filters are already destroyed in
* RCU callbacks, so after a RCU grace period actions are already disconnected
* from filters. Readers later can not find us.
*/
static void free_tcf(struct tc_action *p)
{
struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
free_percpu(p->cpu_bstats);
free_percpu(p->cpu_bstats_hw);
free_percpu(p->cpu_qstats);
tcf_set_action_cookie(&p->user_cookie, NULL);
if (chain)
tcf_chain_put_by_act(chain);
kfree(p);
}
static void offload_action_hw_count_set(struct tc_action *act,
u32 hw_count)
{
act->in_hw_count = hw_count;
}
static void offload_action_hw_count_inc(struct tc_action *act,
u32 hw_count)
{
act->in_hw_count += hw_count;
}
static void offload_action_hw_count_dec(struct tc_action *act,
u32 hw_count)
{
act->in_hw_count = act->in_hw_count > hw_count ?
act->in_hw_count - hw_count : 0;
}
static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act)
{
if (is_tcf_pedit(act))
return tcf_pedit_nkeys(act);
else
return 1;
}
static bool tc_act_skip_hw(u32 flags)
{
return (flags & TCA_ACT_FLAGS_SKIP_HW) ? true : false;
}
static bool tc_act_skip_sw(u32 flags)
{
return (flags & TCA_ACT_FLAGS_SKIP_SW) ? true : false;
}
/* SKIP_HW and SKIP_SW are mutually exclusive flags. */
static bool tc_act_flags_valid(u32 flags)
{
flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW;
return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW);
}
static int offload_action_init(struct flow_offload_action *fl_action,
struct tc_action *act,
enum offload_act_command cmd,
struct netlink_ext_ack *extack)
{
int err;
fl_action->extack = extack;
fl_action->command = cmd;
fl_action->index = act->tcfa_index;
fl_action->cookie = (unsigned long)act;
if (act->ops->offload_act_setup) {
spin_lock_bh(&act->tcfa_lock);
err = act->ops->offload_act_setup(act, fl_action, NULL,
false, extack);
spin_unlock_bh(&act->tcfa_lock);
return err;
}
return -EOPNOTSUPP;
}
static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act,
u32 *hw_count)
{
int err;
err = flow_indr_dev_setup_offload(NULL, NULL, TC_SETUP_ACT,
fl_act, NULL, NULL);
if (err < 0)
return err;
if (hw_count)
*hw_count = err;
return 0;
}
static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act,
u32 *hw_count,
flow_indr_block_bind_cb_t *cb,
void *cb_priv)
{
int err;
err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL);
if (err < 0)
return err;
if (hw_count)
*hw_count = 1;
return 0;
}
static int tcf_action_offload_cmd(struct flow_offload_action *fl_act,
u32 *hw_count,
flow_indr_block_bind_cb_t *cb,
void *cb_priv)
{
return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count,
cb, cb_priv) :
tcf_action_offload_cmd_ex(fl_act, hw_count);
}
static int tcf_action_offload_add_ex(struct tc_action *action,
struct netlink_ext_ack *extack,
flow_indr_block_bind_cb_t *cb,
void *cb_priv)
{
bool skip_sw = tc_act_skip_sw(action->tcfa_flags);
struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
[0] = action,
};
struct flow_offload_action *fl_action;
u32 in_hw_count = 0;
int num, err = 0;
if (tc_act_skip_hw(action->tcfa_flags))
return 0;
num = tcf_offload_act_num_actions_single(action);
fl_action = offload_action_alloc(num);
if (!fl_action)
return -ENOMEM;
err = offload_action_init(fl_action, action, FLOW_ACT_REPLACE, extack);
if (err)
goto fl_err;
err = tc_setup_action(&fl_action->action, actions, 0, extack);
if (err) {
NL_SET_ERR_MSG_MOD(extack,
"Failed to setup tc actions for offload");
goto fl_err;
}
err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv);
if (!err)
cb ? offload_action_hw_count_inc(action, in_hw_count) :
offload_action_hw_count_set(action, in_hw_count);
if (skip_sw && !tc_act_in_hw(action))
err = -EINVAL;
tc_cleanup_offload_action(&fl_action->action);
fl_err:
kfree(fl_action);
return err;
}
/* offload the tc action after it is inserted */
static int tcf_action_offload_add(struct tc_action *action,
struct netlink_ext_ack *extack)
{
return tcf_action_offload_add_ex(action, extack, NULL, NULL);
}
int tcf_action_update_hw_stats(struct tc_action *action)
{
struct flow_offload_action fl_act = {};
int err;
err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL);
if (err)
return err;
err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL);
if (!err) {
preempt_disable();
tcf_action_stats_update(action, fl_act.stats.bytes,
fl_act.stats.pkts,
fl_act.stats.drops,
fl_act.stats.lastused,
true);
preempt_enable();
action->used_hw_stats = fl_act.stats.used_hw_stats;
action->used_hw_stats_valid = true;
} else {
return -EOPNOTSUPP;
}
return 0;
}
EXPORT_SYMBOL(tcf_action_update_hw_stats);
static int tcf_action_offload_del_ex(struct tc_action *action,
flow_indr_block_bind_cb_t *cb,
void *cb_priv)
{
struct flow_offload_action fl_act = {};
u32 in_hw_count = 0;
int err = 0;
if (!tc_act_in_hw(action))
return 0;
err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL);
if (err)
return err;
err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv);
if (err < 0)
return err;
if (!cb && action->in_hw_count != in_hw_count)
return -EINVAL;
/* do not need to update hw state when deleting action */
if (cb && in_hw_count)
offload_action_hw_count_dec(action, in_hw_count);
return 0;
}
static int tcf_action_offload_del(struct tc_action *action)
{
return tcf_action_offload_del_ex(action, NULL, NULL);
}
static void tcf_action_cleanup(struct tc_action *p)
{
tcf_action_offload_del(p);
if (p->ops->cleanup)
p->ops->cleanup(p);
gen_kill_estimator(&p->tcfa_rate_est);
free_tcf(p);
}
static int __tcf_action_put(struct tc_action *p, bool bind)
{
struct tcf_idrinfo *idrinfo = p->idrinfo;
if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
if (bind)
atomic_dec(&p->tcfa_bindcnt);
idr_remove(&idrinfo->action_idr, p->tcfa_index);
mutex_unlock(&idrinfo->lock);
tcf_action_cleanup(p);
return 1;
}
if (bind)
atomic_dec(&p->tcfa_bindcnt);
return 0;
}
static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
{
int ret = 0;
/* Release with strict==1 and bind==0 is only called through act API
* interface (classifiers always bind). Only case when action with
* positive reference count and zero bind count can exist is when it was
* also created with act API (unbinding last classifier will destroy the
* action if it was created by classifier). So only case when bind count
* can be changed after initial check is when unbound action is
* destroyed by act API while classifier binds to action with same id
* concurrently. This result either creation of new action(same behavior
* as before), or reusing existing action if concurrent process
* increments reference count before action is deleted. Both scenarios
* are acceptable.
*/
if (p) {
if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
return -EPERM;
if (__tcf_action_put(p, bind))
ret = ACT_P_DELETED;
}
return ret;
}
int tcf_idr_release(struct tc_action *a, bool bind)
{
const struct tc_action_ops *ops = a->ops;
int ret;
ret = __tcf_idr_release(a, bind, false);
if (ret == ACT_P_DELETED)
module_put(ops->owner);
return ret;
}
EXPORT_SYMBOL(tcf_idr_release);
static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
{
struct tc_cookie *user_cookie;
u32 cookie_len = 0;
rcu_read_lock();
user_cookie = rcu_dereference(act->user_cookie);
if (user_cookie)
cookie_len = nla_total_size(user_cookie->len);
rcu_read_unlock();
return nla_total_size(0) /* action number nested */
+ nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
+ cookie_len /* TCA_ACT_COOKIE */
+ nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
+ nla_total_size(0) /* TCA_ACT_STATS nested */
+ nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
/* TCA_STATS_BASIC */
+ nla_total_size_64bit(sizeof(struct gnet_stats_basic))
/* TCA_STATS_PKT64 */
+ nla_total_size_64bit(sizeof(u64))
/* TCA_STATS_QUEUE */
+ nla_total_size_64bit(sizeof(struct gnet_stats_queue))
+ nla_total_size(0) /* TCA_ACT_OPTIONS nested */
+ nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
}
static size_t tcf_action_full_attrs_size(size_t sz)
{
return NLMSG_HDRLEN /* struct nlmsghdr */
+ sizeof(struct tcamsg)
+ nla_total_size(0) /* TCA_ACT_TAB nested */
+ sz;
}
static size_t tcf_action_fill_size(const struct tc_action *act)
{
size_t sz = tcf_action_shared_attrs_size(act);
if (act->ops->get_fill_size)
return act->ops->get_fill_size(act) + sz;
return sz;
}
static int
tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act)
{
unsigned char *b = skb_tail_pointer(skb);
struct tc_cookie *cookie;
if (nla_put_string(skb, TCA_ACT_KIND, a->ops->kind))
goto nla_put_failure;
if (tcf_action_copy_stats(skb, a, 0))
goto nla_put_failure;
if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index))
goto nla_put_failure;
rcu_read_lock();
cookie = rcu_dereference(a->user_cookie);
if (cookie) {
if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
rcu_read_unlock();
goto nla_put_failure;
}
}
rcu_read_unlock();
return 0;
nla_put_failure:
nlmsg_trim(skb, b);
return -1;
}
static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
struct netlink_callback *cb)
{
int err = 0, index = -1, s_i = 0, n_i = 0;
u32 act_flags = cb->args[2];
unsigned long jiffy_since = cb->args[3];
struct nlattr *nest;
struct idr *idr = &idrinfo->action_idr;
struct tc_action *p;
unsigned long id = 1;
unsigned long tmp;
mutex_lock(&idrinfo->lock);
s_i = cb->args[0];
idr_for_each_entry_ul(idr, p, tmp, id) {
index++;
if (index < s_i)
continue;
if (IS_ERR(p))
continue;
if (jiffy_since &&
time_after(jiffy_since,
(unsigned long)p->tcfa_tm.lastuse))
continue;
tcf_action_update_hw_stats(p);
nest = nla_nest_start_noflag(skb, n_i);
if (!nest) {
index--;
goto nla_put_failure;
}
err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ?
tcf_action_dump_terse(skb, p, true) :
tcf_action_dump_1(skb, p, 0, 0);
if (err < 0) {
index--;
nlmsg_trim(skb, nest);
goto done;
}
nla_nest_end(skb, nest);
n_i++;
if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) &&
n_i >= TCA_ACT_MAX_PRIO)
goto done;
}
done:
if (index >= 0)
cb->args[0] = index + 1;
mutex_unlock(&idrinfo->lock);
if (n_i) {
if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON)
cb->args[1] = n_i;
}
return n_i;
nla_put_failure:
nla_nest_cancel(skb, nest);
goto done;
}
static int tcf_idr_release_unsafe(struct tc_action *p)
{
if (atomic_read(&p->tcfa_bindcnt) > 0)
return -EPERM;
if (refcount_dec_and_test(&p->tcfa_refcnt)) {
idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
tcf_action_cleanup(p);
return ACT_P_DELETED;
}
return 0;
}
static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
const struct tc_action_ops *ops,
struct netlink_ext_ack *extack)
{
struct nlattr *nest;
int n_i = 0;
int ret = -EINVAL;
struct idr *idr = &idrinfo->action_idr;
struct tc_action *p;
unsigned long id = 1;
unsigned long tmp;
nest = nla_nest_start_noflag(skb, 0);
if (nest == NULL)
goto nla_put_failure;
if (nla_put_string(skb, TCA_ACT_KIND, ops->kind))
goto nla_put_failure;
ret = 0;
mutex_lock(&idrinfo->lock);
idr_for_each_entry_ul(idr, p, tmp, id) {
if (IS_ERR(p))
continue;
ret = tcf_idr_release_unsafe(p);
if (ret == ACT_P_DELETED)
module_put(ops->owner);
else if (ret < 0)
break;
n_i++;
}
mutex_unlock(&idrinfo->lock);
if (ret < 0) {
if (n_i)
NL_SET_ERR_MSG(extack, "Unable to flush all TC actions");
else
goto nla_put_failure;
}
ret = nla_put_u32(skb, TCA_FCNT, n_i);
if (ret)
goto nla_put_failure;
nla_nest_end(skb, nest);
return n_i;
nla_put_failure:
nla_nest_cancel(skb, nest);
return ret;
}
int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
struct netlink_callback *cb, int type,
const struct tc_action_ops *ops,
struct netlink_ext_ack *extack)
{
struct tcf_idrinfo *idrinfo = tn->idrinfo;
if (type == RTM_DELACTION) {
return tcf_del_walker(idrinfo, skb, ops, extack);
} else if (type == RTM_GETACTION) {
return tcf_dump_walker(idrinfo, skb, cb);
} else {
WARN(1, "tcf_generic_walker: unknown command %d\n", type);
NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
return -EINVAL;
}
}
EXPORT_SYMBOL(tcf_generic_walker);
int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
{
struct tcf_idrinfo *idrinfo = tn->idrinfo;
struct tc_action *p;
mutex_lock(&idrinfo->lock);
p = idr_find(&idrinfo->action_idr, index);
if (IS_ERR(p))
p = NULL;
else if (p)
refcount_inc(&p->tcfa_refcnt);
mutex_unlock(&idrinfo->lock);
if (p) {
*a = p;
return true;
}
return false;
}
EXPORT_SYMBOL(tcf_idr_search);
static int __tcf_generic_walker(struct net *net, struct sk_buff *skb,
struct netlink_callback *cb, int type,
const struct tc_action_ops *ops,
struct netlink_ext_ack *extack)
{
struct tc_action_net *tn = net_generic(net, ops->net_id);
if (unlikely(ops->walk))
return ops->walk(net, skb, cb, type, ops, extack);
return tcf_generic_walker(tn, skb, cb, type, ops, extack);
}
static int __tcf_idr_search(struct net *net,
const struct tc_action_ops *ops,
struct tc_action **a, u32 index)
{
struct tc_action_net *tn = net_generic(net, ops->net_id);
if (unlikely(ops->lookup))
return ops->lookup(net, a, index);
return tcf_idr_search(tn, a, index);
}
static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
{
struct tc_action *p;
int ret = 0;
mutex_lock(&idrinfo->lock);
p = idr_find(&idrinfo->action_idr, index);
if (!p) {
mutex_unlock(&idrinfo->lock);
return -ENOENT;
}
if (!atomic_read(&p->tcfa_bindcnt)) {
if (refcount_dec_and_test(&p->tcfa_refcnt)) {
struct module *owner = p->ops->owner;
WARN_ON(p != idr_remove(&idrinfo->action_idr,
p->tcfa_index));
mutex_unlock(&idrinfo->lock);
tcf_action_cleanup(p);
module_put(owner);
return 0;
}
ret = 0;
} else {
ret = -EPERM;
}
mutex_unlock(&idrinfo->lock);
return ret;
}
int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
struct tc_action **a, const struct tc_action_ops *ops,
int bind, bool cpustats, u32 flags)
{
struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
struct tcf_idrinfo *idrinfo = tn->idrinfo;
int err = -ENOMEM;
if (unlikely(!p))
return -ENOMEM;
refcount_set(&p->tcfa_refcnt, 1);
if (bind)
atomic_set(&p->tcfa_bindcnt, 1);
if (cpustats) {
p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
if (!p->cpu_bstats)
goto err1;
p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
if (!p->cpu_bstats_hw)
goto err2;
p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
if (!p->cpu_qstats)
goto err3;
}
gnet_stats_basic_sync_init(&p->tcfa_bstats);
gnet_stats_basic_sync_init(&p->tcfa_bstats_hw);
spin_lock_init(&p->tcfa_lock);
p->tcfa_index = index;
p->tcfa_tm.install = jiffies;
p->tcfa_tm.lastuse = jiffies;
p->tcfa_tm.firstuse = 0;
p->tcfa_flags = flags;
if (est) {
err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
&p->tcfa_rate_est,
&p->tcfa_lock, false, est);
if (err)
goto err4;
}
p->idrinfo = idrinfo;
__module_get(ops->owner);
p->ops = ops;
*a = p;
return 0;
err4:
free_percpu(p->cpu_qstats);
err3:
free_percpu(p->cpu_bstats_hw);
err2:
free_percpu(p->cpu_bstats);
err1:
kfree(p);
return err;
}
EXPORT_SYMBOL(tcf_idr_create);
int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
struct nlattr *est, struct tc_action **a,
const struct tc_action_ops *ops, int bind,
u32 flags)
{
/* Set cpustats according to actions flags. */
return tcf_idr_create(tn, index, est, a, ops, bind,
!(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
}
EXPORT_SYMBOL(tcf_idr_create_from_flags);
/* Cleanup idr index that was allocated but not initialized. */
void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
{
struct tcf_idrinfo *idrinfo = tn->idrinfo;
mutex_lock(&idrinfo->lock);
/* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
mutex_unlock(&idrinfo->lock);
}
EXPORT_SYMBOL(tcf_idr_cleanup);
/* Check if action with specified index exists. If actions is found, increments
* its reference and bind counters, and return 1. Otherwise insert temporary
* error pointer (to prevent concurrent users from inserting actions with same
* index) and return 0.
*
* May return -EAGAIN for binding actions in case of a parallel add/delete on
* the requested index.
*/
int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
struct tc_action **a, int bind)
{
struct tcf_idrinfo *idrinfo = tn->idrinfo;
struct tc_action *p;
int ret;
u32 max;
if (*index) {
again:
rcu_read_lock();
p = idr_find(&idrinfo->action_idr, *index);
if (IS_ERR(p)) {
/* This means that another process allocated
* index but did not assign the pointer yet.
*/
rcu_read_unlock();
goto again;
}
if (!p) {
/* Empty slot, try to allocate it */
max = *index;
rcu_read_unlock();
goto new;
}
if (!refcount_inc_not_zero(&p->tcfa_refcnt)) {
/* Action was deleted in parallel */
rcu_read_unlock();
return -EAGAIN;
}
if (bind)
atomic_inc(&p->tcfa_bindcnt);
*a = p;
rcu_read_unlock();
return 1;
} else {
/* Find a slot */
*index = 1;
max = UINT_MAX;
}
new:
*a = NULL;
mutex_lock(&idrinfo->lock);
ret = idr_alloc_u32(&idrinfo->action_idr, ERR_PTR(-EBUSY), index, max,
GFP_KERNEL);
mutex_unlock(&idrinfo->lock);
/* N binds raced for action allocation,
* retry for all the ones that failed.
*/
if (ret == -ENOSPC && *index == max)
ret = -EAGAIN;
return ret;
}
EXPORT_SYMBOL(tcf_idr_check_alloc);
void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
struct tcf_idrinfo *idrinfo)
{
struct idr *idr = &idrinfo->action_idr;
struct tc_action *p;
int ret;
unsigned long id = 1;
unsigned long tmp;
idr_for_each_entry_ul(idr, p, tmp, id) {
ret = __tcf_idr_release(p, false, true);
if (ret == ACT_P_DELETED)
module_put(ops->owner);
else if (ret < 0)
return;
}
idr_destroy(&idrinfo->action_idr);
}
EXPORT_SYMBOL(tcf_idrinfo_destroy);
static LIST_HEAD(act_base);
static DEFINE_RWLOCK(act_mod_lock);
/* since act ops id is stored in pernet subsystem list,
* then there is no way to walk through only all the action
* subsystem, so we keep tc action pernet ops id for
* reoffload to walk through.
*/
static LIST_HEAD(act_pernet_id_list);
static DEFINE_MUTEX(act_id_mutex);
struct tc_act_pernet_id {
struct list_head list;
unsigned int id;
};
static int tcf_pernet_add_id_list(unsigned int id)
{
struct tc_act_pernet_id *id_ptr;
int ret = 0;
mutex_lock(&act_id_mutex);
list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
if (id_ptr->id == id) {
ret = -EEXIST;
goto err_out;
}
}
id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL);
if (!id_ptr) {
ret = -ENOMEM;
goto err_out;
}
id_ptr->id = id;
list_add_tail(&id_ptr->list, &act_pernet_id_list);
err_out:
mutex_unlock(&act_id_mutex);
return ret;
}
static void tcf_pernet_del_id_list(unsigned int id)
{
struct tc_act_pernet_id *id_ptr;
mutex_lock(&act_id_mutex);
list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
if (id_ptr->id == id) {
list_del(&id_ptr->list);
kfree(id_ptr);
break;
}
}
mutex_unlock(&act_id_mutex);
}
int tcf_register_action(struct tc_action_ops *act,
struct pernet_operations *ops)
{
struct tc_action_ops *a;
int ret;
if (!act->act || !act->dump || !act->init)
return -EINVAL;
/* We have to register pernet ops before making the action ops visible,
* otherwise tcf_action_init_1() could get a partially initialized
* netns.
*/
ret = register_pernet_subsys(ops);
if (ret)
return ret;
if (ops->id) {
ret = tcf_pernet_add_id_list(*ops->id);
if (ret)
goto err_id;
}
write_lock(&act_mod_lock);
list_for_each_entry(a, &act_base, head) {
if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
ret = -EEXIST;
goto err_out;
}
}
list_add_tail(&act->head, &act_base);
write_unlock(&act_mod_lock);
return 0;
err_out:
write_unlock(&act_mod_lock);
if (ops->id)
tcf_pernet_del_id_list(*ops->id);
err_id:
unregister_pernet_subsys(ops);
return ret;
}
EXPORT_SYMBOL(tcf_register_action);
int tcf_unregister_action(struct tc_action_ops *act,
struct pernet_operations *ops)
{
struct tc_action_ops *a;
int err = -ENOENT;
write_lock(&act_mod_lock);
list_for_each_entry(a, &act_base, head) {
if (a == act) {
list_del(&act->head);
err = 0;
break;
}
}
write_unlock(&act_mod_lock);
if (!err) {
unregister_pernet_subsys(ops);
if (ops->id)
tcf_pernet_del_id_list(*ops->id);
}
return err;
}
EXPORT_SYMBOL(tcf_unregister_action);
/* lookup by name */
static struct tc_action_ops *tc_lookup_action_n(char *kind)
{
struct tc_action_ops *a, *res = NULL;
if (kind) {
read_lock(&act_mod_lock);
list_for_each_entry(a, &act_base, head) {
if (strcmp(kind, a->kind) == 0) {
if (try_module_get(a->owner))
res = a;
break;
}
}
read_unlock(&act_mod_lock);
}
return res;
}
/* lookup by nlattr */
static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
{
struct tc_action_ops *a, *res = NULL;
if (kind) {
read_lock(&act_mod_lock);
list_for_each_entry(a, &act_base, head) {
if (nla_strcmp(kind, a->kind) == 0) {
if (try_module_get(a->owner))
res = a;
break;
}
}
read_unlock(&act_mod_lock);
}
return res;
}
/*TCA_ACT_MAX_PRIO is 32, there count up to 32 */
#define TCA_ACT_MAX_PRIO_MASK 0x1FF
int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
int nr_actions, struct tcf_result *res)
{
u32 jmp_prgcnt = 0;
u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
int i;
int ret = TC_ACT_OK;
if (skb_skip_tc_classify(skb))
return TC_ACT_OK;
restart_act_graph:
for (i = 0; i < nr_actions; i++) {
const struct tc_action *a = actions[i];
int repeat_ttl;
if (jmp_prgcnt > 0) {
jmp_prgcnt -= 1;
continue;
}
if (tc_act_skip_sw(a->tcfa_flags))
continue;
repeat_ttl = 32;
repeat:
ret = tc_act(skb, a, res);
if (unlikely(ret == TC_ACT_REPEAT)) {
if (--repeat_ttl != 0)
goto repeat;
/* suspicious opcode, stop pipeline */
net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n");
return TC_ACT_OK;
}
if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
/* faulty opcode, stop pipeline */
return TC_ACT_OK;
} else {
jmp_ttl -= 1;
if (jmp_ttl > 0)
goto restart_act_graph;
else /* faulty graph, stop pipeline */
return TC_ACT_OK;
}
} else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
if (unlikely(!rcu_access_pointer(a->goto_chain))) {
tcf_set_drop_reason(skb,
SKB_DROP_REASON_TC_CHAIN_NOTFOUND);
return TC_ACT_SHOT;
}
tcf_action_goto_chain_exec(a, res);
}
if (ret != TC_ACT_PIPE)
break;
}
return ret;
}
EXPORT_SYMBOL(tcf_action_exec);
int tcf_action_destroy(struct tc_action *actions[], int bind)
{
const struct tc_action_ops *ops;
struct tc_action *a;
int ret = 0, i;
tcf_act_for_each_action(i, a, actions) {
actions[i] = NULL;
ops = a->ops;
ret = __tcf_idr_release(a, bind, true);
if (ret == ACT_P_DELETED)
module_put(ops->owner);
else if (ret < 0)
return ret;
}
return ret;
}
static int tcf_action_put(struct tc_action *p)
{
return __tcf_action_put(p, false);
}
static void tcf_action_put_many(struct tc_action *actions[])
{
struct tc_action *a;
int i;
tcf_act_for_each_action(i, a, actions) {
const struct tc_action_ops *ops = a->ops;
if (tcf_action_put(a))
module_put(ops->owner);
}
}
static void tca_put_bound_many(struct tc_action *actions[], int init_res[])
{
struct tc_action *a;
int i;
tcf_act_for_each_action(i, a, actions) {
const struct tc_action_ops *ops = a->ops;
if (init_res[i] == ACT_P_CREATED)
continue;
if (tcf_action_put(a))
module_put(ops->owner);
}
}
int
tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
{
return a->ops->dump(skb, a, bind, ref);
}
int
tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
{
int err = -EINVAL;
unsigned char *b = skb_tail_pointer(skb);
struct nlattr *nest;
u32 flags;
if (tcf_action_dump_terse(skb, a, false))
goto nla_put_failure;
if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
a->hw_stats, TCA_ACT_HW_STATS_ANY))
goto nla_put_failure;
if (a->used_hw_stats_valid &&
nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS,
a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
goto nla_put_failure;
flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK;
if (flags &&
nla_put_bitfield32(skb, TCA_ACT_FLAGS,
flags, flags))
goto nla_put_failure;
if (nla_put_u32(skb, TCA_ACT_IN_HW_COUNT, a->in_hw_count))
goto nla_put_failure;
nest = nla_nest_start_noflag(skb, TCA_ACT_OPTIONS);
if (nest == NULL)
goto nla_put_failure;
err = tcf_action_dump_old(skb, a, bind, ref);
if (err > 0) {
nla_nest_end(skb, nest);
return err;
}
nla_put_failure:
nlmsg_trim(skb, b);
return -1;
}
EXPORT_SYMBOL(tcf_action_dump_1);
int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
int bind, int ref, bool terse)
{
struct tc_action *a;
int err = -EINVAL, i;
struct nlattr *nest;
tcf_act_for_each_action(i, a, actions) {
nest = nla_nest_start_noflag(skb, i + 1);
if (nest == NULL)
goto nla_put_failure;
err = terse ? tcf_action_dump_terse(skb, a, false) :
tcf_action_dump_1(skb, a, bind, ref);
if (err < 0)
goto errout;
nla_nest_end(skb, nest);
}
return 0;
nla_put_failure:
err = -EINVAL;
errout:
nla_nest_cancel(skb, nest);
return err;
}
static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
{
struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
if (!c)
return NULL;
c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
if (!c->data) {
kfree(c);
return NULL;
}
c->len = nla_len(tb[TCA_ACT_COOKIE]);
return c;
}
static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
{
struct nla_bitfield32 hw_stats_bf;
/* If the user did not pass the attr, that means he does
* not care about the type. Return "any" in that case
* which is setting on all supported types.
*/
if (!hw_stats_attr)
return TCA_ACT_HW_STATS_ANY;
hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
return hw_stats_bf.value;
}
static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
[TCA_ACT_KIND] = { .type = NLA_STRING },
[TCA_ACT_INDEX] = { .type = NLA_U32 },
[TCA_ACT_COOKIE] = { .type = NLA_BINARY,
.len = TC_COOKIE_MAX_SIZE },
[TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
[TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS |
TCA_ACT_FLAGS_SKIP_HW |
TCA_ACT_FLAGS_SKIP_SW),
[TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
};
void tcf_idr_insert_many(struct tc_action *actions[], int init_res[])
{
struct tc_action *a;
int i;
tcf_act_for_each_action(i, a, actions) {
struct tcf_idrinfo *idrinfo;
if (init_res[i] == ACT_P_BOUND)
continue;
idrinfo = a->idrinfo;
mutex_lock(&idrinfo->lock);
/* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
mutex_unlock(&idrinfo->lock);
}
}
struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags,
struct netlink_ext_ack *extack)
{
bool police = flags & TCA_ACT_FLAGS_POLICE;
struct nlattr *tb[TCA_ACT_MAX + 1];
struct tc_action_ops *a_o;
char act_name[IFNAMSIZ];
struct nlattr *kind;
int err;
if (!police) {
err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
tcf_action_policy, extack);
if (err < 0)
return ERR_PTR(err);
err = -EINVAL;
kind = tb[TCA_ACT_KIND];
if (!kind) {
NL_SET_ERR_MSG(extack, "TC action kind must be specified");
return ERR_PTR(err);
}
if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) {
NL_SET_ERR_MSG(extack, "TC action name too long");
return ERR_PTR(err);
}
} else {
if (strscpy(act_name, "police", IFNAMSIZ) < 0) {
NL_SET_ERR_MSG(extack, "TC action name too long");
return ERR_PTR(-EINVAL);
}
}
a_o = tc_lookup_action_n(act_name);
if (a_o == NULL) {
#ifdef CONFIG_MODULES
bool rtnl_held = !(flags & TCA_ACT_FLAGS_NO_RTNL);
if (rtnl_held)
rtnl_unlock();
request_module(NET_ACT_ALIAS_PREFIX "%s", act_name);
if (rtnl_held)
rtnl_lock();
a_o = tc_lookup_action_n(act_name);
/* We dropped the RTNL semaphore in order to
* perform the module load. So, even if we
* succeeded in loading the module we have to
* tell the caller to replay the request. We
* indicate this using -EAGAIN.
*/
if (a_o != NULL) {
module_put(a_o->owner);
return ERR_PTR(-EAGAIN);
}
#endif
NL_SET_ERR_MSG(extack, "Failed to load TC action module");
return ERR_PTR(-ENOENT);
}
return a_o;
}
struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
struct nlattr *nla, struct nlattr *est,
struct tc_action_ops *a_o, int *init_res,
u32 flags, struct netlink_ext_ack *extack)
{
bool police = flags & TCA_ACT_FLAGS_POLICE;
struct nla_bitfield32 userflags = { 0, 0 };
struct tc_cookie *user_cookie = NULL;
u8 hw_stats = TCA_ACT_HW_STATS_ANY;
struct nlattr *tb[TCA_ACT_MAX + 1];
struct tc_action *a;
int err;
/* backward compatibility for policer */
if (!police) {
err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
tcf_action_policy, extack);
if (err < 0)
return ERR_PTR(err);
if (tb[TCA_ACT_COOKIE]) {
user_cookie = nla_memdup_cookie(tb);
if (!user_cookie) {
NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
err = -ENOMEM;
goto err_out;
}
}
hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
if (tb[TCA_ACT_FLAGS]) {
userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
if (!tc_act_flags_valid(userflags.value)) {
err = -EINVAL;
goto err_out;
}
}
err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
userflags.value | flags, extack);
} else {
err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
extack);
}
if (err < 0)
goto err_out;
*init_res = err;
if (!police && tb[TCA_ACT_COOKIE])
tcf_set_action_cookie(&a->user_cookie, user_cookie);
if (!police)
a->hw_stats = hw_stats;
return a;
err_out:
if (user_cookie) {
kfree(user_cookie->data);
kfree(user_cookie);
}
return ERR_PTR(err);
}
static bool tc_act_bind(u32 flags)
{
return !!(flags & TCA_ACT_FLAGS_BIND);
}
/* Returns numbers of initialized actions or negative error. */
int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
struct nlattr *est, struct tc_action *actions[],
int init_res[], size_t *attr_size,
u32 flags, u32 fl_flags,
struct netlink_ext_ack *extack)
{
struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
struct tc_action *act;
size_t sz = 0;
int err;
int i;
err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
extack);
if (err < 0)
return err;
for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
struct tc_action_ops *a_o;
a_o = tc_action_load_ops(tb[i], flags, extack);
if (IS_ERR(a_o)) {
err = PTR_ERR(a_o);
goto err_mod;
}
ops[i - 1] = a_o;
}
for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
act = tcf_action_init_1(net, tp, tb[i], est, ops[i - 1],
&init_res[i - 1], flags, extack);
if (IS_ERR(act)) {
err = PTR_ERR(act);
goto err;
}
sz += tcf_action_fill_size(act);
/* Start from index 0 */
actions[i - 1] = act;
if (tc_act_bind(flags)) {
bool skip_sw = tc_skip_sw(fl_flags);
bool skip_hw = tc_skip_hw(fl_flags);
if (tc_act_bind(act->tcfa_flags))
continue;
if (skip_sw != tc_act_skip_sw(act->tcfa_flags) ||
skip_hw != tc_act_skip_hw(act->tcfa_flags)) {
NL_SET_ERR_MSG(extack,
"Mismatch between action and filter offload flags");
err = -EINVAL;
goto err;
}
} else {
err = tcf_action_offload_add(act, extack);
if (tc_act_skip_sw(act->tcfa_flags) && err)
goto err;
}
}
/* We have to commit them all together, because if any error happened in
* between, we could not handle the failure gracefully.
*/
tcf_idr_insert_many(actions, init_res);
*attr_size = tcf_action_full_attrs_size(sz);
err = i - 1;
goto err_mod;
err:
tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND);
err_mod:
for (i = 0; i < TCA_ACT_MAX_PRIO && ops[i]; i++)
module_put(ops[i]->owner);
return err;
}
void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
u64 drops, bool hw)
{
if (a->cpu_bstats) {
_bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
this_cpu_ptr(a->cpu_qstats)->drops += drops;
if (hw)
_bstats_update(this_cpu_ptr(a->cpu_bstats_hw),
bytes, packets);
return;
}
_bstats_update(&a->tcfa_bstats, bytes, packets);
a->tcfa_qstats.drops += drops;
if (hw)
_bstats_update(&a->tcfa_bstats_hw, bytes, packets);
}
EXPORT_SYMBOL(tcf_action_update_stats);
int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
int compat_mode)
{
int err = 0;
struct gnet_dump d;
if (p == NULL)
goto errout;
/* compat_mode being true specifies a call that is supposed
* to add additional backward compatibility statistic TLVs.
*/
if (compat_mode) {
if (p->type == TCA_OLD_COMPAT)
err = gnet_stats_start_copy_compat(skb, 0,
TCA_STATS,
TCA_XSTATS,
&p->tcfa_lock, &d,
TCA_PAD);
else
return 0;
} else
err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
&p->tcfa_lock, &d, TCA_ACT_PAD);
if (err < 0)
goto errout;
if (gnet_stats_copy_basic(&d, p->cpu_bstats,
&p->tcfa_bstats, false) < 0 ||
gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw,
&p->tcfa_bstats_hw, false) < 0 ||
gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
gnet_stats_copy_queue(&d, p->cpu_qstats,
&p->tcfa_qstats,
p->tcfa_qstats.qlen) < 0)
goto errout;
if (gnet_stats_finish_copy(&d) < 0)
goto errout;
return 0;
errout:
return -1;
}
static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
u32 portid, u32 seq, u16 flags, int event, int bind,
int ref, struct netlink_ext_ack *extack)
{
struct tcamsg *t;
struct nlmsghdr *nlh;
unsigned char *b = skb_tail_pointer(skb);
struct nlattr *nest;
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
if (!nlh)
goto out_nlmsg_trim;
t = nlmsg_data(nlh);
t->tca_family = AF_UNSPEC;
t->tca__pad1 = 0;
t->tca__pad2 = 0;
if (extack && extack->_msg &&
nla_put_string(skb, TCA_ROOT_EXT_WARN_MSG, extack->_msg))
goto out_nlmsg_trim;
nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
if (!nest)
goto out_nlmsg_trim;
if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
goto out_nlmsg_trim;
nla_nest_end(skb, nest);
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
return skb->len;
out_nlmsg_trim:
nlmsg_trim(skb, b);
return -1;
}
static int
tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
struct tc_action *actions[], int event,
struct netlink_ext_ack *extack)
{
struct sk_buff *skb;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOBUFS;
if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
0, 1, NULL) <= 0) {
NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
kfree_skb(skb);
return -EINVAL;
}
return rtnl_unicast(skb, net, portid);
}
static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
struct nlmsghdr *n, u32 portid,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[TCA_ACT_MAX + 1];
const struct tc_action_ops *ops;
struct tc_action *a;
int index;
int err;
err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
tcf_action_policy, extack);
if (err < 0)
goto err_out;
err = -EINVAL;
if (tb[TCA_ACT_INDEX] == NULL ||
nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
NL_SET_ERR_MSG(extack, "Invalid TC action index value");
goto err_out;
}
index = nla_get_u32(tb[TCA_ACT_INDEX]);
err = -EINVAL;
ops = tc_lookup_action(tb[TCA_ACT_KIND]);
if (!ops) { /* could happen in batch of actions */
NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
goto err_out;
}
err = -ENOENT;
if (__tcf_idr_search(net, ops, &a, index) == 0) {
NL_SET_ERR_MSG(extack, "TC action with specified index not found");
goto err_mod;
}
module_put(ops->owner);
return a;
err_mod:
module_put(ops->owner);
err_out:
return ERR_PTR(err);
}
static int tca_action_flush(struct net *net, struct nlattr *nla,
struct nlmsghdr *n, u32 portid,
struct netlink_ext_ack *extack)
{
struct sk_buff *skb;
unsigned char *b;
struct nlmsghdr *nlh;
struct tcamsg *t;
struct netlink_callback dcb;
struct nlattr *nest;
struct nlattr *tb[TCA_ACT_MAX + 1];
const struct tc_action_ops *ops;
struct nlattr *kind;
int err = -ENOMEM;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return err;
b = skb_tail_pointer(skb);
err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
tcf_action_policy, extack);
if (err < 0)
goto err_out;
err = -EINVAL;
kind = tb[TCA_ACT_KIND];
ops = tc_lookup_action(kind);
if (!ops) { /*some idjot trying to flush unknown action */
NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
goto err_out;
}
nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
sizeof(*t), 0);
if (!nlh) {
NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
goto out_module_put;
}
t = nlmsg_data(nlh);
t->tca_family = AF_UNSPEC;
t->tca__pad1 = 0;
t->tca__pad2 = 0;
nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
if (!nest) {
NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
goto out_module_put;
}
err = __tcf_generic_walker(net, skb, &dcb, RTM_DELACTION, ops, extack);
if (err <= 0) {
nla_nest_cancel(skb, nest);
goto out_module_put;
}
nla_nest_end(skb, nest);
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
nlh->nlmsg_flags |= NLM_F_ROOT;
module_put(ops->owner);
err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
n->nlmsg_flags & NLM_F_ECHO);
if (err < 0)
NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
return err;
out_module_put:
module_put(ops->owner);
err_out:
kfree_skb(skb);
return err;
}
static int tcf_action_delete(struct net *net, struct tc_action *actions[])
{
struct tc_action *a;
int i;
tcf_act_for_each_action(i, a, actions) {
const struct tc_action_ops *ops = a->ops;
/* Actions can be deleted concurrently so we must save their
* type and id to search again after reference is released.
*/
struct tcf_idrinfo *idrinfo = a->idrinfo;
u32 act_index = a->tcfa_index;
actions[i] = NULL;
if (tcf_action_put(a)) {
/* last reference, action was deleted concurrently */
module_put(ops->owner);
} else {
int ret;
/* now do the delete */
ret = tcf_idr_delete_index(idrinfo, act_index);
if (ret < 0)
return ret;
}
}
return 0;
}
static struct sk_buff *tcf_reoffload_del_notify_msg(struct net *net,
struct tc_action *action)
{
size_t attr_size = tcf_action_fill_size(action);
struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
[0] = action,
};
struct sk_buff *skb;
skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
if (!skb)
return ERR_PTR(-ENOBUFS);
if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1, NULL) <= 0) {
kfree_skb(skb);
return ERR_PTR(-EINVAL);
}
return skb;
}
static int tcf_reoffload_del_notify(struct net *net, struct tc_action *action)
{
const struct tc_action_ops *ops = action->ops;
struct sk_buff *skb;
int ret;
if (!rtnl_notify_needed(net, 0, RTNLGRP_TC)) {
skb = NULL;
} else {
skb = tcf_reoffload_del_notify_msg(net, action);
if (IS_ERR(skb))
return PTR_ERR(skb);
}
ret = tcf_idr_release_unsafe(action);
if (ret == ACT_P_DELETED) {
module_put(ops->owner);
ret = rtnetlink_maybe_send(skb, net, 0, RTNLGRP_TC, 0);
} else {
kfree_skb(skb);
}
return ret;
}
int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
void *cb_priv, bool add)
{
struct tc_act_pernet_id *id_ptr;
struct tcf_idrinfo *idrinfo;
struct tc_action_net *tn;
struct tc_action *p;
unsigned int act_id;
unsigned long tmp;
unsigned long id;
struct idr *idr;
struct net *net;
int ret;
if (!cb)
return -EINVAL;
down_read(&net_rwsem);
mutex_lock(&act_id_mutex);
for_each_net(net) {
list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
act_id = id_ptr->id;
tn = net_generic(net, act_id);
if (!tn)
continue;
idrinfo = tn->idrinfo;
if (!idrinfo)
continue;
mutex_lock(&idrinfo->lock);
idr = &idrinfo->action_idr;
idr_for_each_entry_ul(idr, p, tmp, id) {
if (IS_ERR(p) || tc_act_bind(p->tcfa_flags))
continue;
if (add) {
tcf_action_offload_add_ex(p, NULL, cb,
cb_priv);
continue;
}
/* cb unregister to update hw count */
ret = tcf_action_offload_del_ex(p, cb, cb_priv);
if (ret < 0)
continue;
if (tc_act_skip_sw(p->tcfa_flags) &&
!tc_act_in_hw(p))
tcf_reoffload_del_notify(net, p);
}
mutex_unlock(&idrinfo->lock);
}
}
mutex_unlock(&act_id_mutex);
up_read(&net_rwsem);
return 0;
}
static struct sk_buff *tcf_del_notify_msg(struct net *net, struct nlmsghdr *n,
struct tc_action *actions[],
u32 portid, size_t attr_size,
struct netlink_ext_ack *extack)
{
struct sk_buff *skb;
skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
if (!skb)
return ERR_PTR(-ENOBUFS);
if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
0, 2, extack) <= 0) {
NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
kfree_skb(skb);
return ERR_PTR(-EINVAL);
}
return skb;
}
static int tcf_del_notify(struct net *net, struct nlmsghdr *n,
struct tc_action *actions[], u32 portid,
size_t attr_size, struct netlink_ext_ack *extack)
{
struct sk_buff *skb;
int ret;
if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
skb = NULL;
} else {
skb = tcf_del_notify_msg(net, n, actions, portid, attr_size,
extack);
if (IS_ERR(skb))
return PTR_ERR(skb);
}
/* now do the delete */
ret = tcf_action_delete(net, actions);
if (ret < 0) {
NL_SET_ERR_MSG(extack, "Failed to delete TC action");
kfree_skb(skb);
return ret;
}
return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
n->nlmsg_flags & NLM_F_ECHO);
}
static int
tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
u32 portid, int event, struct netlink_ext_ack *extack)
{
int i, ret;
struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
struct tc_action *act;
size_t attr_size = 0;
struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
extack);
if (ret < 0)
return ret;
if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
if (tb[1])
return tca_action_flush(net, tb[1], n, portid, extack);
NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
return -EINVAL;
}
for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
act = tcf_action_get_1(net, tb[i], n, portid, extack);
if (IS_ERR(act)) {
ret = PTR_ERR(act);
goto err;
}
attr_size += tcf_action_fill_size(act);
actions[i - 1] = act;
}
attr_size = tcf_action_full_attrs_size(attr_size);
if (event == RTM_GETACTION)
ret = tcf_get_notify(net, portid, n, actions, event, extack);
else { /* delete */
ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
if (ret)
goto err;
return 0;
}
err:
tcf_action_put_many(actions);
return ret;
}
static struct sk_buff *tcf_add_notify_msg(struct net *net, struct nlmsghdr *n,
struct tc_action *actions[],
u32 portid, size_t attr_size,
struct netlink_ext_ack *extack)
{
struct sk_buff *skb;
skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
if (!skb)
return ERR_PTR(-ENOBUFS);
if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
RTM_NEWACTION, 0, 0, extack) <= 0) {
NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
kfree_skb(skb);
return ERR_PTR(-EINVAL);
}
return skb;
}
static int tcf_add_notify(struct net *net, struct nlmsghdr *n,
struct tc_action *actions[], u32 portid,
size_t attr_size, struct netlink_ext_ack *extack)
{
struct sk_buff *skb;
if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
skb = NULL;
} else {
skb = tcf_add_notify_msg(net, n, actions, portid, attr_size,
extack);
if (IS_ERR(skb))
return PTR_ERR(skb);
}
return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
n->nlmsg_flags & NLM_F_ECHO);
}
static int tcf_action_add(struct net *net, struct nlattr *nla,
struct nlmsghdr *n, u32 portid, u32 flags,
struct netlink_ext_ack *extack)
{
size_t attr_size = 0;
int loop, ret;
struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
int init_res[TCA_ACT_MAX_PRIO] = {};
for (loop = 0; loop < 10; loop++) {
ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res,
&attr_size, flags, 0, extack);
if (ret != -EAGAIN)
break;
}
if (ret < 0)
return ret;
ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
/* only put bound actions */
tca_put_bound_many(actions, init_res);
return ret;
}
static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
[TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
TCA_ACT_FLAG_TERSE_DUMP),
[TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
};
static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct nlattr *tca[TCA_ROOT_MAX + 1];
u32 portid = NETLINK_CB(skb).portid;
u32 flags = 0;
int ret = 0;
if ((n->nlmsg_type != RTM_GETACTION) &&
!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
TCA_ROOT_MAX, NULL, extack);
if (ret < 0)
return ret;
if (tca[TCA_ACT_TAB] == NULL) {
NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
return -EINVAL;
}
/* n->nlmsg_flags & NLM_F_CREATE */
switch (n->nlmsg_type) {
case RTM_NEWACTION:
/* we are going to assume all other flags
* imply create only if it doesn't exist
* Note that CREATE | EXCL implies that
* but since we want avoid ambiguity (eg when flags
* is zero) then just set this
*/
if (n->nlmsg_flags & NLM_F_REPLACE)
flags = TCA_ACT_FLAGS_REPLACE;
ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags,
extack);
break;
case RTM_DELACTION:
ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
portid, RTM_DELACTION, extack);
break;
case RTM_GETACTION:
ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
portid, RTM_GETACTION, extack);
break;
default:
BUG();
}
return ret;
}
static struct nlattr *find_dump_kind(struct nlattr **nla)
{
struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
struct nlattr *kind;
tb1 = nla[TCA_ACT_TAB];
if (tb1 == NULL)
return NULL;
if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
return NULL;
if (tb[1] == NULL)
return NULL;
if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
return NULL;
kind = tb2[TCA_ACT_KIND];
return kind;
}
static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
struct nlmsghdr *nlh;
unsigned char *b = skb_tail_pointer(skb);
struct nlattr *nest;
struct tc_action_ops *a_o;
int ret = 0;
struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
struct nlattr *tb[TCA_ROOT_MAX + 1];
struct nlattr *count_attr = NULL;
unsigned long jiffy_since = 0;
struct nlattr *kind = NULL;
struct nla_bitfield32 bf;
u32 msecs_since = 0;
u32 act_count = 0;
ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
TCA_ROOT_MAX, tcaa_policy, cb->extack);
if (ret < 0)
return ret;
kind = find_dump_kind(tb);
if (kind == NULL) {
pr_info("tc_dump_action: action bad kind\n");
return 0;
}
a_o = tc_lookup_action(kind);
if (a_o == NULL)
return 0;
cb->args[2] = 0;
if (tb[TCA_ROOT_FLAGS]) {
bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
cb->args[2] = bf.value;
}
if (tb[TCA_ROOT_TIME_DELTA]) {
msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
}
nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
cb->nlh->nlmsg_type, sizeof(*t), 0);
if (!nlh)
goto out_module_put;
if (msecs_since)
jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
t = nlmsg_data(nlh);
t->tca_family = AF_UNSPEC;
t->tca__pad1 = 0;
t->tca__pad2 = 0;
cb->args[3] = jiffy_since;
count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
if (!count_attr)
goto out_module_put;
nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
if (nest == NULL)
goto out_module_put;
ret = __tcf_generic_walker(net, skb, cb, RTM_GETACTION, a_o, NULL);
if (ret < 0)
goto out_module_put;
if (ret > 0) {
nla_nest_end(skb, nest);
ret = skb->len;
act_count = cb->args[1];
memcpy(nla_data(count_attr), &act_count, sizeof(u32));
cb->args[1] = 0;
} else
nlmsg_trim(skb, b);
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
if (NETLINK_CB(cb->skb).portid && ret)
nlh->nlmsg_flags |= NLM_F_MULTI;
module_put(a_o->owner);
return skb->len;
out_module_put:
module_put(a_o->owner);
nlmsg_trim(skb, b);
return skb->len;
}
static int __init tc_action_init(void)
{
rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
0);
return 0;
}
subsys_initcall(tc_action_init);