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authorFlorian Westphal <fw@strlen.de>2021-04-21 09:51:09 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2021-04-26 03:20:47 +0200
commitee177a54413a33fe474d55fabb5f8ff390bb27d7 (patch)
treedf47870ff85ff795d24629489b5ef42a64b10d75
parentf9006acc8dfe59e25aa75729728ac57a8d84fc32 (diff)
netfilter: ip6_tables: pass table pointer via nf_hook_ops
Same patch as the ip_tables one: removal of all accesses to ip6_tables xt_table pointers. After this patch the struct net xt_table anchors can be removed. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
-rw-r--r--include/linux/netfilter_ipv6/ip6_tables.h5
-rw-r--r--net/ipv6/netfilter/ip6_tables.c51
-rw-r--r--net/ipv6/netfilter/ip6table_filter.c9
-rw-r--r--net/ipv6/netfilter/ip6table_mangle.c14
-rw-r--r--net/ipv6/netfilter/ip6table_nat.c24
-rw-r--r--net/ipv6/netfilter/ip6table_raw.c9
-rw-r--r--net/ipv6/netfilter/ip6table_security.c8
7 files changed, 63 insertions, 57 deletions
diff --git a/include/linux/netfilter_ipv6/ip6_tables.h b/include/linux/netfilter_ipv6/ip6_tables.h
index 8c07426e18a8..11d0e725fe79 100644
--- a/include/linux/netfilter_ipv6/ip6_tables.h
+++ b/include/linux/netfilter_ipv6/ip6_tables.h
@@ -26,9 +26,8 @@ extern void *ip6t_alloc_initial_table(const struct xt_table *);
int ip6t_register_table(struct net *net, const struct xt_table *table,
const struct ip6t_replace *repl,
- const struct nf_hook_ops *ops, struct xt_table **res);
-void ip6t_unregister_table_pre_exit(struct net *net, const char *name,
- const struct nf_hook_ops *ops);
+ const struct nf_hook_ops *ops);
+void ip6t_unregister_table_pre_exit(struct net *net, const char *name);
void ip6t_unregister_table_exit(struct net *net, const char *name);
extern unsigned int ip6t_do_table(struct sk_buff *skb,
const struct nf_hook_state *state,
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 11c80da12ee3..e763716ffa25 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -1725,10 +1725,11 @@ static void __ip6t_unregister_table(struct net *net, struct xt_table *table)
int ip6t_register_table(struct net *net, const struct xt_table *table,
const struct ip6t_replace *repl,
- const struct nf_hook_ops *ops,
- struct xt_table **res)
+ const struct nf_hook_ops *template_ops)
{
- int ret;
+ struct nf_hook_ops *ops;
+ unsigned int num_ops;
+ int ret, i;
struct xt_table_info *newinfo;
struct xt_table_info bootstrap = {0};
void *loc_cpu_entry;
@@ -1742,40 +1743,54 @@ int ip6t_register_table(struct net *net, const struct xt_table *table,
memcpy(loc_cpu_entry, repl->entries, repl->size);
ret = translate_table(net, newinfo, loc_cpu_entry, repl);
- if (ret != 0)
- goto out_free;
+ if (ret != 0) {
+ xt_free_table_info(newinfo);
+ return ret;
+ }
new_table = xt_register_table(net, table, &bootstrap, newinfo);
if (IS_ERR(new_table)) {
- ret = PTR_ERR(new_table);
- goto out_free;
+ xt_free_table_info(newinfo);
+ return PTR_ERR(new_table);
}
- /* set res now, will see skbs right after nf_register_net_hooks */
- WRITE_ONCE(*res, new_table);
- if (!ops)
+ if (!template_ops)
return 0;
- ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks));
- if (ret != 0) {
- __ip6t_unregister_table(net, new_table);
- *res = NULL;
+ num_ops = hweight32(table->valid_hooks);
+ if (num_ops == 0) {
+ ret = -EINVAL;
+ goto out_free;
}
+ ops = kmemdup(template_ops, sizeof(*ops) * num_ops, GFP_KERNEL);
+ if (!ops) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
+
+ for (i = 0; i < num_ops; i++)
+ ops[i].priv = new_table;
+
+ new_table->ops = ops;
+
+ ret = nf_register_net_hooks(net, ops, num_ops);
+ if (ret != 0)
+ goto out_free;
+
return ret;
out_free:
- xt_free_table_info(newinfo);
+ __ip6t_unregister_table(net, new_table);
return ret;
}
-void ip6t_unregister_table_pre_exit(struct net *net, const char *name,
- const struct nf_hook_ops *ops)
+void ip6t_unregister_table_pre_exit(struct net *net, const char *name)
{
struct xt_table *table = xt_find_table(net, NFPROTO_IPV6, name);
if (table)
- nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks));
+ nf_unregister_net_hooks(net, table->ops, hweight32(table->valid_hooks));
}
void ip6t_unregister_table_exit(struct net *net, const char *name)
diff --git a/net/ipv6/netfilter/ip6table_filter.c b/net/ipv6/netfilter/ip6table_filter.c
index 2bcafa3e2d35..bb784ea7bbd3 100644
--- a/net/ipv6/netfilter/ip6table_filter.c
+++ b/net/ipv6/netfilter/ip6table_filter.c
@@ -35,7 +35,7 @@ static unsigned int
ip6table_filter_hook(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{
- return ip6t_do_table(skb, state, state->net->ipv6.ip6table_filter);
+ return ip6t_do_table(skb, state, priv);
}
static struct nf_hook_ops *filter_ops __read_mostly;
@@ -56,8 +56,7 @@ static int __net_init ip6table_filter_table_init(struct net *net)
((struct ip6t_standard *)repl->entries)[1].target.verdict =
forward ? -NF_ACCEPT - 1 : -NF_DROP - 1;
- err = ip6t_register_table(net, &packet_filter, repl, filter_ops,
- &net->ipv6.ip6table_filter);
+ err = ip6t_register_table(net, &packet_filter, repl, filter_ops);
kfree(repl);
return err;
}
@@ -72,14 +71,12 @@ static int __net_init ip6table_filter_net_init(struct net *net)
static void __net_exit ip6table_filter_net_pre_exit(struct net *net)
{
- ip6t_unregister_table_pre_exit(net, "filter",
- filter_ops);
+ ip6t_unregister_table_pre_exit(net, "filter");
}
static void __net_exit ip6table_filter_net_exit(struct net *net)
{
ip6t_unregister_table_exit(net, "filter");
- net->ipv6.ip6table_filter = NULL;
}
static struct pernet_operations ip6table_filter_net_ops = {
diff --git a/net/ipv6/netfilter/ip6table_mangle.c b/net/ipv6/netfilter/ip6table_mangle.c
index 14e22022bf41..c76cffd63041 100644
--- a/net/ipv6/netfilter/ip6table_mangle.c
+++ b/net/ipv6/netfilter/ip6table_mangle.c
@@ -32,7 +32,7 @@ static const struct xt_table packet_mangler = {
};
static unsigned int
-ip6t_mangle_out(struct sk_buff *skb, const struct nf_hook_state *state)
+ip6t_mangle_out(struct sk_buff *skb, const struct nf_hook_state *state, void *priv)
{
unsigned int ret;
struct in6_addr saddr, daddr;
@@ -49,7 +49,7 @@ ip6t_mangle_out(struct sk_buff *skb, const struct nf_hook_state *state)
/* flowlabel and prio (includes version, which shouldn't change either */
flowlabel = *((u_int32_t *)ipv6_hdr(skb));
- ret = ip6t_do_table(skb, state, state->net->ipv6.ip6table_mangle);
+ ret = ip6t_do_table(skb, state, priv);
if (ret != NF_DROP && ret != NF_STOLEN &&
(!ipv6_addr_equal(&ipv6_hdr(skb)->saddr, &saddr) ||
@@ -71,8 +71,8 @@ ip6table_mangle_hook(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{
if (state->hook == NF_INET_LOCAL_OUT)
- return ip6t_mangle_out(skb, state);
- return ip6t_do_table(skb, state, state->net->ipv6.ip6table_mangle);
+ return ip6t_mangle_out(skb, state, priv);
+ return ip6t_do_table(skb, state, priv);
}
static struct nf_hook_ops *mangle_ops __read_mostly;
@@ -84,21 +84,19 @@ static int __net_init ip6table_mangle_table_init(struct net *net)
repl = ip6t_alloc_initial_table(&packet_mangler);
if (repl == NULL)
return -ENOMEM;
- ret = ip6t_register_table(net, &packet_mangler, repl, mangle_ops,
- &net->ipv6.ip6table_mangle);
+ ret = ip6t_register_table(net, &packet_mangler, repl, mangle_ops);
kfree(repl);
return ret;
}
static void __net_exit ip6table_mangle_net_pre_exit(struct net *net)
{
- ip6t_unregister_table_pre_exit(net, "mangle", mangle_ops);
+ ip6t_unregister_table_pre_exit(net, "mangle");
}
static void __net_exit ip6table_mangle_net_exit(struct net *net)
{
ip6t_unregister_table_exit(net, "mangle");
- net->ipv6.ip6table_mangle = NULL;
}
static struct pernet_operations ip6table_mangle_net_ops = {
diff --git a/net/ipv6/netfilter/ip6table_nat.c b/net/ipv6/netfilter/ip6table_nat.c
index 69b7f9601d03..b0292251e655 100644
--- a/net/ipv6/netfilter/ip6table_nat.c
+++ b/net/ipv6/netfilter/ip6table_nat.c
@@ -68,12 +68,19 @@ static const struct nf_hook_ops nf_nat_ipv6_ops[] = {
},
};
-static int ip6t_nat_register_lookups(struct net *net, struct xt_table *table)
+static int ip6t_nat_register_lookups(struct net *net)
{
- struct nf_hook_ops *ops = kmemdup(nf_nat_ipv6_ops, sizeof(nf_nat_ipv6_ops), GFP_KERNEL);
- struct ip6table_nat_pernet *xt_nat_net = net_generic(net, ip6table_nat_net_id);
+ struct ip6table_nat_pernet *xt_nat_net;
+ struct nf_hook_ops *ops;
+ struct xt_table *table;
int i, ret;
+ table = xt_find_table(net, NFPROTO_IPV6, "nat");
+ if (WARN_ON_ONCE(!table))
+ return -ENOENT;
+
+ xt_nat_net = net_generic(net, ip6table_nat_net_id);
+ ops = kmemdup(nf_nat_ipv6_ops, sizeof(nf_nat_ipv6_ops), GFP_KERNEL);
if (!ops)
return -ENOMEM;
@@ -111,25 +118,21 @@ static void ip6t_nat_unregister_lookups(struct net *net)
static int __net_init ip6table_nat_table_init(struct net *net)
{
struct ip6t_replace *repl;
- struct xt_table *table;
int ret;
repl = ip6t_alloc_initial_table(&nf_nat_ipv6_table);
if (repl == NULL)
return -ENOMEM;
ret = ip6t_register_table(net, &nf_nat_ipv6_table, repl,
- NULL, &table);
+ NULL);
if (ret < 0) {
kfree(repl);
return ret;
}
- ret = ip6t_nat_register_lookups(net, table);
- if (ret < 0) {
+ ret = ip6t_nat_register_lookups(net);
+ if (ret < 0)
ip6t_unregister_table_exit(net, "nat");
- } else {
- net->ipv6.ip6table_nat = table;
- }
kfree(repl);
return ret;
@@ -143,7 +146,6 @@ static void __net_exit ip6table_nat_net_pre_exit(struct net *net)
static void __net_exit ip6table_nat_net_exit(struct net *net)
{
ip6t_unregister_table_exit(net, "nat");
- net->ipv6.ip6table_nat = NULL;
}
static struct pernet_operations ip6table_nat_net_ops = {
diff --git a/net/ipv6/netfilter/ip6table_raw.c b/net/ipv6/netfilter/ip6table_raw.c
index ae3df59f0350..f63c106c521e 100644
--- a/net/ipv6/netfilter/ip6table_raw.c
+++ b/net/ipv6/netfilter/ip6table_raw.c
@@ -40,7 +40,7 @@ static unsigned int
ip6table_raw_hook(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{
- return ip6t_do_table(skb, state, state->net->ipv6.ip6table_raw);
+ return ip6t_do_table(skb, state, priv);
}
static struct nf_hook_ops *rawtable_ops __read_mostly;
@@ -57,22 +57,19 @@ static int __net_init ip6table_raw_table_init(struct net *net)
repl = ip6t_alloc_initial_table(table);
if (repl == NULL)
return -ENOMEM;
- ret = ip6t_register_table(net, table, repl, rawtable_ops,
- &net->ipv6.ip6table_raw);
+ ret = ip6t_register_table(net, table, repl, rawtable_ops);
kfree(repl);
return ret;
}
static void __net_exit ip6table_raw_net_pre_exit(struct net *net)
{
- ip6t_unregister_table_pre_exit(net, "raw",
- rawtable_ops);
+ ip6t_unregister_table_pre_exit(net, "raw");
}
static void __net_exit ip6table_raw_net_exit(struct net *net)
{
ip6t_unregister_table_exit(net, "raw");
- net->ipv6.ip6table_raw = NULL;
}
static struct pernet_operations ip6table_raw_net_ops = {
diff --git a/net/ipv6/netfilter/ip6table_security.c b/net/ipv6/netfilter/ip6table_security.c
index 83ca632cbf88..8dc335cf450b 100644
--- a/net/ipv6/netfilter/ip6table_security.c
+++ b/net/ipv6/netfilter/ip6table_security.c
@@ -39,7 +39,7 @@ static unsigned int
ip6table_security_hook(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{
- return ip6t_do_table(skb, state, state->net->ipv6.ip6table_security);
+ return ip6t_do_table(skb, state, priv);
}
static struct nf_hook_ops *sectbl_ops __read_mostly;
@@ -52,21 +52,19 @@ static int __net_init ip6table_security_table_init(struct net *net)
repl = ip6t_alloc_initial_table(&security_table);
if (repl == NULL)
return -ENOMEM;
- ret = ip6t_register_table(net, &security_table, repl, sectbl_ops,
- &net->ipv6.ip6table_security);
+ ret = ip6t_register_table(net, &security_table, repl, sectbl_ops);
kfree(repl);
return ret;
}
static void __net_exit ip6table_security_net_pre_exit(struct net *net)
{
- ip6t_unregister_table_pre_exit(net, "security", sectbl_ops);
+ ip6t_unregister_table_pre_exit(net, "security");
}
static void __net_exit ip6table_security_net_exit(struct net *net)
{
ip6t_unregister_table_exit(net, "security");
- net->ipv6.ip6table_security = NULL;
}
static struct pernet_operations ip6table_security_net_ops = {