mirror of
https://github.com/torvalds/linux.git
synced 2024-12-10 13:12:04 +00:00
241a94abcf
No functional change intended, aliases will be used in followup commits. Note for backporters: you may need to add aliases also for modules that are already removed in mainline kernel but still in your version. Patches were generated with the help of Coccinelle scripts like: cat >scripts/coccinelle/misc/tcf_alias.cocci <<EOD virtual patch virtual report @ haskernel @ @@ @ tcf_has_kind depends on report && haskernel @ identifier ops; constant K; @@ static struct tcf_proto_ops ops = { .kind = K, ... }; +char module_alias = K; EOD /usr/bin/spatch -D report --cocci-file scripts/coccinelle/misc/tcf_alias.cocci \ --dir . \ -I ./arch/x86/include -I ./arch/x86/include/generated -I ./include \ -I ./arch/x86/include/uapi -I ./arch/x86/include/generated/uapi \ -I ./include/uapi -I ./include/generated/uapi \ --include ./include/linux/compiler-version.h --include ./include/linux/kconfig.h \ --jobs 8 --chunksize 1 2>/dev/null | \ sed 's/char module_alias = "\([^"]*\)";/MODULE_ALIAS_NET_CLS("\1");/' And analogously for: static struct tc_action_ops ops = { .kind = K, static struct Qdisc_ops ops = { .id = K, (Someone familiar would be able to fit those into one .cocci file without sed post processing.) Signed-off-by: Michal Koutný <mkoutny@suse.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Reviewed-by: Jiri Pirko <jiri@nvidia.com> Link: https://lore.kernel.org/r/20240201130943.19536-3-mkoutny@suse.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
363 lines
7.9 KiB
C
363 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Stateless NAT actions
|
|
*
|
|
* Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/netfilter.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#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 struct tc_action_ops act_nat_ops;
|
|
|
|
static const struct nla_policy nat_policy[TCA_NAT_MAX + 1] = {
|
|
[TCA_NAT_PARMS] = { .len = sizeof(struct tc_nat) },
|
|
};
|
|
|
|
static int tcf_nat_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_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_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]);
|
|
index = parm->index;
|
|
err = tcf_idr_check_alloc(tn, &index, a, bind);
|
|
if (!err) {
|
|
ret = tcf_idr_create_from_flags(tn, index, est, a, &act_nat_ops,
|
|
bind, flags);
|
|
if (ret) {
|
|
tcf_idr_cleanup(tn, index);
|
|
return ret;
|
|
}
|
|
ret = ACT_P_CREATED;
|
|
} else if (err > 0) {
|
|
if (bind)
|
|
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;
|
|
|
|
p = to_tcf_nat(*a);
|
|
|
|
spin_lock_bh(&p->tcf_lock);
|
|
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 (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;
|
|
}
|
|
|
|
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;
|
|
__be32 mask;
|
|
__be32 addr;
|
|
int egress;
|
|
int action;
|
|
int ihl;
|
|
int noff;
|
|
|
|
tcf_lastuse_update(&p->tcf_tm);
|
|
tcf_action_update_bstats(&p->common, skb);
|
|
|
|
action = READ_ONCE(p->tcf_action);
|
|
|
|
parms = rcu_dereference_bh(p->parms);
|
|
old_addr = parms->old_addr;
|
|
new_addr = parms->new_addr;
|
|
mask = parms->mask;
|
|
egress = parms->flags & TCA_NAT_FLAG_EGRESS;
|
|
|
|
if (unlikely(action == TC_ACT_SHOT))
|
|
goto drop;
|
|
|
|
noff = skb_network_offset(skb);
|
|
if (!pskb_may_pull(skb, sizeof(*iph) + noff))
|
|
goto drop;
|
|
|
|
iph = ip_hdr(skb);
|
|
|
|
if (egress)
|
|
addr = iph->saddr;
|
|
else
|
|
addr = iph->daddr;
|
|
|
|
if (!((old_addr ^ addr) & mask)) {
|
|
if (skb_try_make_writable(skb, sizeof(*iph) + noff))
|
|
goto drop;
|
|
|
|
new_addr &= mask;
|
|
new_addr |= addr & ~mask;
|
|
|
|
/* Rewrite IP header */
|
|
iph = ip_hdr(skb);
|
|
if (egress)
|
|
iph->saddr = new_addr;
|
|
else
|
|
iph->daddr = new_addr;
|
|
|
|
csum_replace4(&iph->check, addr, new_addr);
|
|
} else if ((iph->frag_off & htons(IP_OFFSET)) ||
|
|
iph->protocol != IPPROTO_ICMP) {
|
|
goto out;
|
|
}
|
|
|
|
ihl = iph->ihl * 4;
|
|
|
|
/* It would be nice to share code with stateful NAT. */
|
|
switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) {
|
|
case IPPROTO_TCP:
|
|
{
|
|
struct tcphdr *tcph;
|
|
|
|
if (!pskb_may_pull(skb, ihl + sizeof(*tcph) + noff) ||
|
|
skb_try_make_writable(skb, ihl + sizeof(*tcph) + noff))
|
|
goto drop;
|
|
|
|
tcph = (void *)(skb_network_header(skb) + ihl);
|
|
inet_proto_csum_replace4(&tcph->check, skb, addr, new_addr,
|
|
true);
|
|
break;
|
|
}
|
|
case IPPROTO_UDP:
|
|
{
|
|
struct udphdr *udph;
|
|
|
|
if (!pskb_may_pull(skb, ihl + sizeof(*udph) + noff) ||
|
|
skb_try_make_writable(skb, ihl + sizeof(*udph) + noff))
|
|
goto drop;
|
|
|
|
udph = (void *)(skb_network_header(skb) + ihl);
|
|
if (udph->check || skb->ip_summed == CHECKSUM_PARTIAL) {
|
|
inet_proto_csum_replace4(&udph->check, skb, addr,
|
|
new_addr, true);
|
|
if (!udph->check)
|
|
udph->check = CSUM_MANGLED_0;
|
|
}
|
|
break;
|
|
}
|
|
case IPPROTO_ICMP:
|
|
{
|
|
struct icmphdr *icmph;
|
|
|
|
if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + noff))
|
|
goto drop;
|
|
|
|
icmph = (void *)(skb_network_header(skb) + ihl);
|
|
|
|
if (!icmp_is_err(icmph->type))
|
|
break;
|
|
|
|
if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + sizeof(*iph) +
|
|
noff))
|
|
goto drop;
|
|
|
|
icmph = (void *)(skb_network_header(skb) + ihl);
|
|
iph = (void *)(icmph + 1);
|
|
if (egress)
|
|
addr = iph->daddr;
|
|
else
|
|
addr = iph->saddr;
|
|
|
|
if ((old_addr ^ addr) & mask)
|
|
break;
|
|
|
|
if (skb_try_make_writable(skb, ihl + sizeof(*icmph) +
|
|
sizeof(*iph) + noff))
|
|
goto drop;
|
|
|
|
icmph = (void *)(skb_network_header(skb) + ihl);
|
|
iph = (void *)(icmph + 1);
|
|
|
|
new_addr &= mask;
|
|
new_addr |= addr & ~mask;
|
|
|
|
/* XXX Fix up the inner checksums. */
|
|
if (egress)
|
|
iph->daddr = new_addr;
|
|
else
|
|
iph->saddr = new_addr;
|
|
|
|
inet_proto_csum_replace4(&icmph->checksum, skb, addr, new_addr,
|
|
false);
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
out:
|
|
return action;
|
|
|
|
drop:
|
|
tcf_action_inc_drop_qstats(&p->common);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
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);
|
|
struct tc_nat opt = {
|
|
.index = p->tcf_index,
|
|
.refcnt = refcount_read(&p->tcf_refcnt) - ref,
|
|
.bindcnt = atomic_read(&p->tcf_bindcnt) - bind,
|
|
};
|
|
struct tcf_nat_parms *parms;
|
|
struct tcf_t t;
|
|
|
|
spin_lock_bh(&p->tcf_lock);
|
|
|
|
opt.action = p->tcf_action;
|
|
|
|
parms = rcu_dereference_protected(p->parms, lockdep_is_held(&p->tcf_lock));
|
|
|
|
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;
|
|
|
|
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);
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
spin_unlock_bh(&p->tcf_lock);
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
static void tcf_nat_cleanup(struct tc_action *a)
|
|
{
|
|
struct tcf_nat *p = to_tcf_nat(a);
|
|
struct tcf_nat_parms *parms;
|
|
|
|
parms = rcu_dereference_protected(p->parms, 1);
|
|
if (parms)
|
|
kfree_rcu(parms, rcu);
|
|
}
|
|
|
|
static struct tc_action_ops act_nat_ops = {
|
|
.kind = "nat",
|
|
.id = TCA_ID_NAT,
|
|
.owner = THIS_MODULE,
|
|
.act = tcf_nat_act,
|
|
.dump = tcf_nat_dump,
|
|
.init = tcf_nat_init,
|
|
.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, act_nat_ops.net_id);
|
|
|
|
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, act_nat_ops.net_id);
|
|
}
|
|
|
|
static struct pernet_operations nat_net_ops = {
|
|
.init = nat_init_net,
|
|
.exit_batch = nat_exit_net,
|
|
.id = &act_nat_ops.net_id,
|
|
.size = sizeof(struct tc_action_net),
|
|
};
|
|
|
|
MODULE_DESCRIPTION("Stateless NAT actions");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int __init nat_init_module(void)
|
|
{
|
|
return tcf_register_action(&act_nat_ops, &nat_net_ops);
|
|
}
|
|
|
|
static void __exit nat_cleanup_module(void)
|
|
{
|
|
tcf_unregister_action(&act_nat_ops, &nat_net_ops);
|
|
}
|
|
|
|
module_init(nat_init_module);
|
|
module_exit(nat_cleanup_module);
|