summaryrefslogtreecommitdiff
path: root/net/sched/act_nat.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/sched/act_nat.c')
-rw-r--r--net/sched/act_nat.c159
1 files changed, 85 insertions, 74 deletions
diff --git a/net/sched/act_nat.c b/net/sched/act_nat.c
index c5c1e23add77..26241d80ebe0 100644
--- a/net/sched/act_nat.c
+++ b/net/sched/act_nat.c
@@ -1,12 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Stateless NAT actions
*
* Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
*/
#include <linux/errno.h>
@@ -21,15 +17,15 @@
#include <linux/string.h>
#include <linux/tc_act/tc_nat.h>
#include <net/act_api.h>
+#include <net/pkt_cls.h>
#include <net/icmp.h>
#include <net/ip.h>
#include <net/netlink.h>
#include <net/tc_act/tc_nat.h>
#include <net/tcp.h>
#include <net/udp.h>
+#include <net/tc_wrapper.h>
-
-static unsigned int nat_net_id;
static struct tc_action_ops act_nat_ops;
static const struct nla_policy nat_policy[TCA_NAT_MAX + 1] = {
@@ -37,66 +33,91 @@ static const struct nla_policy nat_policy[TCA_NAT_MAX + 1] = {
};
static int tcf_nat_init(struct net *net, struct nlattr *nla, struct nlattr *est,
- struct tc_action **a, int ovr, int bind,
- bool rtnl_held, struct netlink_ext_ack *extack)
+ struct tc_action **a, struct tcf_proto *tp,
+ u32 flags, struct netlink_ext_ack *extack)
{
- struct tc_action_net *tn = net_generic(net, nat_net_id);
+ struct tc_action_net *tn = net_generic(net, act_nat_ops.net_id);
+ bool bind = flags & TCA_ACT_FLAGS_BIND;
+ struct tcf_nat_parms *nparm, *oparm;
struct nlattr *tb[TCA_NAT_MAX + 1];
+ struct tcf_chain *goto_ch = NULL;
struct tc_nat *parm;
int ret = 0, err;
struct tcf_nat *p;
+ u32 index;
if (nla == NULL)
return -EINVAL;
- err = nla_parse_nested(tb, TCA_NAT_MAX, nla, nat_policy, NULL);
+ err = nla_parse_nested_deprecated(tb, TCA_NAT_MAX, nla, nat_policy,
+ NULL);
if (err < 0)
return err;
if (tb[TCA_NAT_PARMS] == NULL)
return -EINVAL;
parm = nla_data(tb[TCA_NAT_PARMS]);
-
- err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
+ index = parm->index;
+ err = tcf_idr_check_alloc(tn, &index, a, bind);
if (!err) {
- ret = tcf_idr_create(tn, parm->index, est, a,
- &act_nat_ops, bind, false);
+ ret = tcf_idr_create_from_flags(tn, index, est, a, &act_nat_ops,
+ bind, flags);
if (ret) {
- tcf_idr_cleanup(tn, parm->index);
+ tcf_idr_cleanup(tn, index);
return ret;
}
ret = ACT_P_CREATED;
} else if (err > 0) {
if (bind)
- return 0;
- if (!ovr) {
+ return ACT_P_BOUND;
+ if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
tcf_idr_release(*a, bind);
return -EEXIST;
}
} else {
return err;
}
+ err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
+ if (err < 0)
+ goto release_idr;
+
+ nparm = kzalloc(sizeof(*nparm), GFP_KERNEL);
+ if (!nparm) {
+ err = -ENOMEM;
+ goto release_idr;
+ }
+
+ nparm->old_addr = parm->old_addr;
+ nparm->new_addr = parm->new_addr;
+ nparm->mask = parm->mask;
+ nparm->flags = parm->flags;
+ nparm->action = parm->action;
+
p = to_tcf_nat(*a);
spin_lock_bh(&p->tcf_lock);
- p->old_addr = parm->old_addr;
- p->new_addr = parm->new_addr;
- p->mask = parm->mask;
- p->flags = parm->flags;
-
- p->tcf_action = parm->action;
+ goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
+ oparm = rcu_replace_pointer(p->parms, nparm, lockdep_is_held(&p->tcf_lock));
spin_unlock_bh(&p->tcf_lock);
- if (ret == ACT_P_CREATED)
- tcf_idr_insert(tn, *a);
+ if (goto_ch)
+ tcf_chain_put_by_act(goto_ch);
+
+ if (oparm)
+ kfree_rcu(oparm, rcu);
return ret;
+release_idr:
+ tcf_idr_release(*a, bind);
+ return err;
}
-static int tcf_nat_act(struct sk_buff *skb, const struct tc_action *a,
- struct tcf_result *res)
+TC_INDIRECT_SCOPE int tcf_nat_act(struct sk_buff *skb,
+ const struct tc_action *a,
+ struct tcf_result *res)
{
struct tcf_nat *p = to_tcf_nat(a);
+ struct tcf_nat_parms *parms;
struct iphdr *iph;
__be32 old_addr;
__be32 new_addr;
@@ -107,22 +128,19 @@ static int tcf_nat_act(struct sk_buff *skb, const struct tc_action *a,
int ihl;
int noff;
- spin_lock(&p->tcf_lock);
-
tcf_lastuse_update(&p->tcf_tm);
- old_addr = p->old_addr;
- new_addr = p->new_addr;
- mask = p->mask;
- egress = p->flags & TCA_NAT_FLAG_EGRESS;
- action = p->tcf_action;
-
- bstats_update(&p->tcf_bstats, skb);
-
- spin_unlock(&p->tcf_lock);
+ tcf_action_update_bstats(&p->common, skb);
+ parms = rcu_dereference_bh(p->parms);
+ action = parms->action;
if (unlikely(action == TC_ACT_SHOT))
goto drop;
+ old_addr = parms->old_addr;
+ new_addr = parms->new_addr;
+ mask = parms->mask;
+ egress = parms->flags & TCA_NAT_FLAG_EGRESS;
+
noff = skb_network_offset(skb);
if (!pskb_may_pull(skb, sizeof(*iph) + noff))
goto drop;
@@ -197,9 +215,7 @@ static int tcf_nat_act(struct sk_buff *skb, const struct tc_action *a,
icmph = (void *)(skb_network_header(skb) + ihl);
- if ((icmph->type != ICMP_DEST_UNREACH) &&
- (icmph->type != ICMP_TIME_EXCEEDED) &&
- (icmph->type != ICMP_PARAMETERPROB))
+ if (!icmp_is_err(icmph->type))
break;
if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + sizeof(*iph) +
@@ -244,9 +260,7 @@ out:
return action;
drop:
- spin_lock(&p->tcf_lock);
- p->tcf_qstats.drops++;
- spin_unlock(&p->tcf_lock);
+ tcf_action_inc_drop_qstats(&p->common);
return TC_ACT_SHOT;
}
@@ -254,7 +268,8 @@ static int tcf_nat_dump(struct sk_buff *skb, struct tc_action *a,
int bind, int ref)
{
unsigned char *b = skb_tail_pointer(skb);
- struct tcf_nat *p = to_tcf_nat(a);
+ const struct tcf_nat *p = to_tcf_nat(a);
+ const struct tcf_nat_parms *parms;
struct tc_nat opt = {
.index = p->tcf_index,
.refcnt = refcount_read(&p->tcf_refcnt) - ref,
@@ -262,12 +277,15 @@ static int tcf_nat_dump(struct sk_buff *skb, struct tc_action *a,
};
struct tcf_t t;
- spin_lock_bh(&p->tcf_lock);
- opt.old_addr = p->old_addr;
- opt.new_addr = p->new_addr;
- opt.mask = p->mask;
- opt.flags = p->flags;
- opt.action = p->tcf_action;
+ rcu_read_lock();
+
+ parms = rcu_dereference(p->parms);
+
+ opt.action = parms->action;
+ opt.old_addr = parms->old_addr;
+ opt.new_addr = parms->new_addr;
+ opt.mask = parms->mask;
+ opt.flags = parms->flags;
if (nla_put(skb, TCA_NAT_PARMS, sizeof(opt), &opt))
goto nla_put_failure;
@@ -275,61 +293,54 @@ static int tcf_nat_dump(struct sk_buff *skb, struct tc_action *a,
tcf_tm_dump(&t, &p->tcf_tm);
if (nla_put_64bit(skb, TCA_NAT_TM, sizeof(t), &t, TCA_NAT_PAD))
goto nla_put_failure;
- spin_unlock_bh(&p->tcf_lock);
+ rcu_read_unlock();
return skb->len;
nla_put_failure:
- spin_unlock_bh(&p->tcf_lock);
+ rcu_read_unlock();
nlmsg_trim(skb, b);
return -1;
}
-static int tcf_nat_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, nat_net_id);
-
- return tcf_generic_walker(tn, skb, cb, type, ops, extack);
-}
-
-static int tcf_nat_search(struct net *net, struct tc_action **a, u32 index)
+static void tcf_nat_cleanup(struct tc_action *a)
{
- struct tc_action_net *tn = net_generic(net, nat_net_id);
+ struct tcf_nat *p = to_tcf_nat(a);
+ struct tcf_nat_parms *parms;
- return tcf_idr_search(tn, a, index);
+ parms = rcu_dereference_protected(p->parms, 1);
+ if (parms)
+ kfree_rcu(parms, rcu);
}
static struct tc_action_ops act_nat_ops = {
.kind = "nat",
- .type = TCA_ACT_NAT,
+ .id = TCA_ID_NAT,
.owner = THIS_MODULE,
.act = tcf_nat_act,
.dump = tcf_nat_dump,
.init = tcf_nat_init,
- .walk = tcf_nat_walker,
- .lookup = tcf_nat_search,
+ .cleanup = tcf_nat_cleanup,
.size = sizeof(struct tcf_nat),
};
+MODULE_ALIAS_NET_ACT("nat");
static __net_init int nat_init_net(struct net *net)
{
- struct tc_action_net *tn = net_generic(net, nat_net_id);
+ struct tc_action_net *tn = net_generic(net, act_nat_ops.net_id);
- return tc_action_net_init(tn, &act_nat_ops);
+ return tc_action_net_init(net, tn, &act_nat_ops);
}
static void __net_exit nat_exit_net(struct list_head *net_list)
{
- tc_action_net_exit(net_list, nat_net_id);
+ tc_action_net_exit(net_list, act_nat_ops.net_id);
}
static struct pernet_operations nat_net_ops = {
.init = nat_init_net,
.exit_batch = nat_exit_net,
- .id = &nat_net_id,
+ .id = &act_nat_ops.net_id,
.size = sizeof(struct tc_action_net),
};
generated by cgit (git 2.34.1) at 2025-12-25 00:47:41 +0000