mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-05 02:19:51 +00:00
![Pedro Tammela](/assets/img/avatar_default.png)
Expose the necessary tc act functions and wire up act_api to use direct calls in retpoline kernels. Signed-off-by: Pedro Tammela <pctammela@mojatatu.com> Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com> Reviewed-by: Victor Nogueira <victor@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
465 lines
12 KiB
C
465 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/if_vlan.h>
|
|
#include <net/netlink.h>
|
|
#include <net/pkt_sched.h>
|
|
#include <net/pkt_cls.h>
|
|
#include <net/tc_wrapper.h>
|
|
|
|
#include <linux/tc_act/tc_vlan.h>
|
|
#include <net/tc_act/tc_vlan.h>
|
|
|
|
static struct tc_action_ops act_vlan_ops;
|
|
|
|
TC_INDIRECT_SCOPE int tcf_vlan_act(struct sk_buff *skb,
|
|
const struct tc_action *a,
|
|
struct tcf_result *res)
|
|
{
|
|
struct tcf_vlan *v = to_vlan(a);
|
|
struct tcf_vlan_params *p;
|
|
int action;
|
|
int err;
|
|
u16 tci;
|
|
|
|
tcf_lastuse_update(&v->tcf_tm);
|
|
tcf_action_update_bstats(&v->common, skb);
|
|
|
|
/* Ensure 'data' points at mac_header prior calling vlan manipulating
|
|
* functions.
|
|
*/
|
|
if (skb_at_tc_ingress(skb))
|
|
skb_push_rcsum(skb, skb->mac_len);
|
|
|
|
action = READ_ONCE(v->tcf_action);
|
|
|
|
p = rcu_dereference_bh(v->vlan_p);
|
|
|
|
switch (p->tcfv_action) {
|
|
case TCA_VLAN_ACT_POP:
|
|
err = skb_vlan_pop(skb);
|
|
if (err)
|
|
goto drop;
|
|
break;
|
|
case TCA_VLAN_ACT_PUSH:
|
|
err = skb_vlan_push(skb, p->tcfv_push_proto, p->tcfv_push_vid |
|
|
(p->tcfv_push_prio << VLAN_PRIO_SHIFT));
|
|
if (err)
|
|
goto drop;
|
|
break;
|
|
case TCA_VLAN_ACT_MODIFY:
|
|
/* No-op if no vlan tag (either hw-accel or in-payload) */
|
|
if (!skb_vlan_tagged(skb))
|
|
goto out;
|
|
/* extract existing tag (and guarantee no hw-accel tag) */
|
|
if (skb_vlan_tag_present(skb)) {
|
|
tci = skb_vlan_tag_get(skb);
|
|
__vlan_hwaccel_clear_tag(skb);
|
|
} else {
|
|
/* in-payload vlan tag, pop it */
|
|
err = __skb_vlan_pop(skb, &tci);
|
|
if (err)
|
|
goto drop;
|
|
}
|
|
/* replace the vid */
|
|
tci = (tci & ~VLAN_VID_MASK) | p->tcfv_push_vid;
|
|
/* replace prio bits, if tcfv_push_prio specified */
|
|
if (p->tcfv_push_prio_exists) {
|
|
tci &= ~VLAN_PRIO_MASK;
|
|
tci |= p->tcfv_push_prio << VLAN_PRIO_SHIFT;
|
|
}
|
|
/* put updated tci as hwaccel tag */
|
|
__vlan_hwaccel_put_tag(skb, p->tcfv_push_proto, tci);
|
|
break;
|
|
case TCA_VLAN_ACT_POP_ETH:
|
|
err = skb_eth_pop(skb);
|
|
if (err)
|
|
goto drop;
|
|
break;
|
|
case TCA_VLAN_ACT_PUSH_ETH:
|
|
err = skb_eth_push(skb, p->tcfv_push_dst, p->tcfv_push_src);
|
|
if (err)
|
|
goto drop;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
out:
|
|
if (skb_at_tc_ingress(skb))
|
|
skb_pull_rcsum(skb, skb->mac_len);
|
|
|
|
return action;
|
|
|
|
drop:
|
|
tcf_action_inc_drop_qstats(&v->common);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = {
|
|
[TCA_VLAN_UNSPEC] = { .strict_start_type = TCA_VLAN_PUSH_ETH_DST },
|
|
[TCA_VLAN_PARMS] = { .len = sizeof(struct tc_vlan) },
|
|
[TCA_VLAN_PUSH_VLAN_ID] = { .type = NLA_U16 },
|
|
[TCA_VLAN_PUSH_VLAN_PROTOCOL] = { .type = NLA_U16 },
|
|
[TCA_VLAN_PUSH_VLAN_PRIORITY] = { .type = NLA_U8 },
|
|
[TCA_VLAN_PUSH_ETH_DST] = NLA_POLICY_ETH_ADDR,
|
|
[TCA_VLAN_PUSH_ETH_SRC] = NLA_POLICY_ETH_ADDR,
|
|
};
|
|
|
|
static int tcf_vlan_init(struct net *net, struct nlattr *nla,
|
|
struct nlattr *est, struct tc_action **a,
|
|
struct tcf_proto *tp, u32 flags,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, act_vlan_ops.net_id);
|
|
bool bind = flags & TCA_ACT_FLAGS_BIND;
|
|
struct nlattr *tb[TCA_VLAN_MAX + 1];
|
|
struct tcf_chain *goto_ch = NULL;
|
|
bool push_prio_exists = false;
|
|
struct tcf_vlan_params *p;
|
|
struct tc_vlan *parm;
|
|
struct tcf_vlan *v;
|
|
int action;
|
|
u16 push_vid = 0;
|
|
__be16 push_proto = 0;
|
|
u8 push_prio = 0;
|
|
bool exists = false;
|
|
int ret = 0, err;
|
|
u32 index;
|
|
|
|
if (!nla)
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested_deprecated(tb, TCA_VLAN_MAX, nla, vlan_policy,
|
|
NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!tb[TCA_VLAN_PARMS])
|
|
return -EINVAL;
|
|
parm = nla_data(tb[TCA_VLAN_PARMS]);
|
|
index = parm->index;
|
|
err = tcf_idr_check_alloc(tn, &index, a, bind);
|
|
if (err < 0)
|
|
return err;
|
|
exists = err;
|
|
if (exists && bind)
|
|
return 0;
|
|
|
|
switch (parm->v_action) {
|
|
case TCA_VLAN_ACT_POP:
|
|
break;
|
|
case TCA_VLAN_ACT_PUSH:
|
|
case TCA_VLAN_ACT_MODIFY:
|
|
if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
|
|
if (exists)
|
|
tcf_idr_release(*a, bind);
|
|
else
|
|
tcf_idr_cleanup(tn, index);
|
|
return -EINVAL;
|
|
}
|
|
push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
|
|
if (push_vid >= VLAN_VID_MASK) {
|
|
if (exists)
|
|
tcf_idr_release(*a, bind);
|
|
else
|
|
tcf_idr_cleanup(tn, index);
|
|
return -ERANGE;
|
|
}
|
|
|
|
if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
|
|
push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
|
|
switch (push_proto) {
|
|
case htons(ETH_P_8021Q):
|
|
case htons(ETH_P_8021AD):
|
|
break;
|
|
default:
|
|
if (exists)
|
|
tcf_idr_release(*a, bind);
|
|
else
|
|
tcf_idr_cleanup(tn, index);
|
|
return -EPROTONOSUPPORT;
|
|
}
|
|
} else {
|
|
push_proto = htons(ETH_P_8021Q);
|
|
}
|
|
|
|
push_prio_exists = !!tb[TCA_VLAN_PUSH_VLAN_PRIORITY];
|
|
if (push_prio_exists)
|
|
push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
|
|
break;
|
|
case TCA_VLAN_ACT_POP_ETH:
|
|
break;
|
|
case TCA_VLAN_ACT_PUSH_ETH:
|
|
if (!tb[TCA_VLAN_PUSH_ETH_DST] || !tb[TCA_VLAN_PUSH_ETH_SRC]) {
|
|
if (exists)
|
|
tcf_idr_release(*a, bind);
|
|
else
|
|
tcf_idr_cleanup(tn, index);
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
default:
|
|
if (exists)
|
|
tcf_idr_release(*a, bind);
|
|
else
|
|
tcf_idr_cleanup(tn, index);
|
|
return -EINVAL;
|
|
}
|
|
action = parm->v_action;
|
|
|
|
if (!exists) {
|
|
ret = tcf_idr_create_from_flags(tn, index, est, a,
|
|
&act_vlan_ops, bind, flags);
|
|
if (ret) {
|
|
tcf_idr_cleanup(tn, index);
|
|
return ret;
|
|
}
|
|
|
|
ret = ACT_P_CREATED;
|
|
} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
|
|
tcf_idr_release(*a, bind);
|
|
return -EEXIST;
|
|
}
|
|
|
|
err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
|
|
if (err < 0)
|
|
goto release_idr;
|
|
|
|
v = to_vlan(*a);
|
|
|
|
p = kzalloc(sizeof(*p), GFP_KERNEL);
|
|
if (!p) {
|
|
err = -ENOMEM;
|
|
goto put_chain;
|
|
}
|
|
|
|
p->tcfv_action = action;
|
|
p->tcfv_push_vid = push_vid;
|
|
p->tcfv_push_prio = push_prio;
|
|
p->tcfv_push_prio_exists = push_prio_exists || action == TCA_VLAN_ACT_PUSH;
|
|
p->tcfv_push_proto = push_proto;
|
|
|
|
if (action == TCA_VLAN_ACT_PUSH_ETH) {
|
|
nla_memcpy(&p->tcfv_push_dst, tb[TCA_VLAN_PUSH_ETH_DST],
|
|
ETH_ALEN);
|
|
nla_memcpy(&p->tcfv_push_src, tb[TCA_VLAN_PUSH_ETH_SRC],
|
|
ETH_ALEN);
|
|
}
|
|
|
|
spin_lock_bh(&v->tcf_lock);
|
|
goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
|
|
p = rcu_replace_pointer(v->vlan_p, p, lockdep_is_held(&v->tcf_lock));
|
|
spin_unlock_bh(&v->tcf_lock);
|
|
|
|
if (goto_ch)
|
|
tcf_chain_put_by_act(goto_ch);
|
|
if (p)
|
|
kfree_rcu(p, rcu);
|
|
|
|
return ret;
|
|
put_chain:
|
|
if (goto_ch)
|
|
tcf_chain_put_by_act(goto_ch);
|
|
release_idr:
|
|
tcf_idr_release(*a, bind);
|
|
return err;
|
|
}
|
|
|
|
static void tcf_vlan_cleanup(struct tc_action *a)
|
|
{
|
|
struct tcf_vlan *v = to_vlan(a);
|
|
struct tcf_vlan_params *p;
|
|
|
|
p = rcu_dereference_protected(v->vlan_p, 1);
|
|
if (p)
|
|
kfree_rcu(p, rcu);
|
|
}
|
|
|
|
static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
|
|
int bind, int ref)
|
|
{
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct tcf_vlan *v = to_vlan(a);
|
|
struct tcf_vlan_params *p;
|
|
struct tc_vlan opt = {
|
|
.index = v->tcf_index,
|
|
.refcnt = refcount_read(&v->tcf_refcnt) - ref,
|
|
.bindcnt = atomic_read(&v->tcf_bindcnt) - bind,
|
|
};
|
|
struct tcf_t t;
|
|
|
|
spin_lock_bh(&v->tcf_lock);
|
|
opt.action = v->tcf_action;
|
|
p = rcu_dereference_protected(v->vlan_p, lockdep_is_held(&v->tcf_lock));
|
|
opt.v_action = p->tcfv_action;
|
|
if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
|
|
goto nla_put_failure;
|
|
|
|
if ((p->tcfv_action == TCA_VLAN_ACT_PUSH ||
|
|
p->tcfv_action == TCA_VLAN_ACT_MODIFY) &&
|
|
(nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, p->tcfv_push_vid) ||
|
|
nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL,
|
|
p->tcfv_push_proto) ||
|
|
(p->tcfv_push_prio_exists &&
|
|
nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY, p->tcfv_push_prio))))
|
|
goto nla_put_failure;
|
|
|
|
if (p->tcfv_action == TCA_VLAN_ACT_PUSH_ETH) {
|
|
if (nla_put(skb, TCA_VLAN_PUSH_ETH_DST, ETH_ALEN,
|
|
p->tcfv_push_dst))
|
|
goto nla_put_failure;
|
|
if (nla_put(skb, TCA_VLAN_PUSH_ETH_SRC, ETH_ALEN,
|
|
p->tcfv_push_src))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
tcf_tm_dump(&t, &v->tcf_tm);
|
|
if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD))
|
|
goto nla_put_failure;
|
|
spin_unlock_bh(&v->tcf_lock);
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
spin_unlock_bh(&v->tcf_lock);
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
static void tcf_vlan_stats_update(struct tc_action *a, u64 bytes, u64 packets,
|
|
u64 drops, u64 lastuse, bool hw)
|
|
{
|
|
struct tcf_vlan *v = to_vlan(a);
|
|
struct tcf_t *tm = &v->tcf_tm;
|
|
|
|
tcf_action_update_stats(a, bytes, packets, drops, hw);
|
|
tm->lastuse = max_t(u64, tm->lastuse, lastuse);
|
|
}
|
|
|
|
static size_t tcf_vlan_get_fill_size(const struct tc_action *act)
|
|
{
|
|
return nla_total_size(sizeof(struct tc_vlan))
|
|
+ nla_total_size(sizeof(u16)) /* TCA_VLAN_PUSH_VLAN_ID */
|
|
+ nla_total_size(sizeof(u16)) /* TCA_VLAN_PUSH_VLAN_PROTOCOL */
|
|
+ nla_total_size(sizeof(u8)); /* TCA_VLAN_PUSH_VLAN_PRIORITY */
|
|
}
|
|
|
|
static int tcf_vlan_offload_act_setup(struct tc_action *act, void *entry_data,
|
|
u32 *index_inc, bool bind,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (bind) {
|
|
struct flow_action_entry *entry = entry_data;
|
|
|
|
switch (tcf_vlan_action(act)) {
|
|
case TCA_VLAN_ACT_PUSH:
|
|
entry->id = FLOW_ACTION_VLAN_PUSH;
|
|
entry->vlan.vid = tcf_vlan_push_vid(act);
|
|
entry->vlan.proto = tcf_vlan_push_proto(act);
|
|
entry->vlan.prio = tcf_vlan_push_prio(act);
|
|
break;
|
|
case TCA_VLAN_ACT_POP:
|
|
entry->id = FLOW_ACTION_VLAN_POP;
|
|
break;
|
|
case TCA_VLAN_ACT_MODIFY:
|
|
entry->id = FLOW_ACTION_VLAN_MANGLE;
|
|
entry->vlan.vid = tcf_vlan_push_vid(act);
|
|
entry->vlan.proto = tcf_vlan_push_proto(act);
|
|
entry->vlan.prio = tcf_vlan_push_prio(act);
|
|
break;
|
|
case TCA_VLAN_ACT_POP_ETH:
|
|
entry->id = FLOW_ACTION_VLAN_POP_ETH;
|
|
break;
|
|
case TCA_VLAN_ACT_PUSH_ETH:
|
|
entry->id = FLOW_ACTION_VLAN_PUSH_ETH;
|
|
tcf_vlan_push_eth(entry->vlan_push_eth.src, entry->vlan_push_eth.dst, act);
|
|
break;
|
|
default:
|
|
NL_SET_ERR_MSG_MOD(extack, "Unsupported vlan action mode offload");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
*index_inc = 1;
|
|
} else {
|
|
struct flow_offload_action *fl_action = entry_data;
|
|
|
|
switch (tcf_vlan_action(act)) {
|
|
case TCA_VLAN_ACT_PUSH:
|
|
fl_action->id = FLOW_ACTION_VLAN_PUSH;
|
|
break;
|
|
case TCA_VLAN_ACT_POP:
|
|
fl_action->id = FLOW_ACTION_VLAN_POP;
|
|
break;
|
|
case TCA_VLAN_ACT_MODIFY:
|
|
fl_action->id = FLOW_ACTION_VLAN_MANGLE;
|
|
break;
|
|
case TCA_VLAN_ACT_POP_ETH:
|
|
fl_action->id = FLOW_ACTION_VLAN_POP_ETH;
|
|
break;
|
|
case TCA_VLAN_ACT_PUSH_ETH:
|
|
fl_action->id = FLOW_ACTION_VLAN_PUSH_ETH;
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct tc_action_ops act_vlan_ops = {
|
|
.kind = "vlan",
|
|
.id = TCA_ID_VLAN,
|
|
.owner = THIS_MODULE,
|
|
.act = tcf_vlan_act,
|
|
.dump = tcf_vlan_dump,
|
|
.init = tcf_vlan_init,
|
|
.cleanup = tcf_vlan_cleanup,
|
|
.stats_update = tcf_vlan_stats_update,
|
|
.get_fill_size = tcf_vlan_get_fill_size,
|
|
.offload_act_setup = tcf_vlan_offload_act_setup,
|
|
.size = sizeof(struct tcf_vlan),
|
|
};
|
|
|
|
static __net_init int vlan_init_net(struct net *net)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, act_vlan_ops.net_id);
|
|
|
|
return tc_action_net_init(net, tn, &act_vlan_ops);
|
|
}
|
|
|
|
static void __net_exit vlan_exit_net(struct list_head *net_list)
|
|
{
|
|
tc_action_net_exit(net_list, act_vlan_ops.net_id);
|
|
}
|
|
|
|
static struct pernet_operations vlan_net_ops = {
|
|
.init = vlan_init_net,
|
|
.exit_batch = vlan_exit_net,
|
|
.id = &act_vlan_ops.net_id,
|
|
.size = sizeof(struct tc_action_net),
|
|
};
|
|
|
|
static int __init vlan_init_module(void)
|
|
{
|
|
return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
|
|
}
|
|
|
|
static void __exit vlan_cleanup_module(void)
|
|
{
|
|
tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
|
|
}
|
|
|
|
module_init(vlan_init_module);
|
|
module_exit(vlan_cleanup_module);
|
|
|
|
MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
|
|
MODULE_DESCRIPTION("vlan manipulation actions");
|
|
MODULE_LICENSE("GPL v2");
|