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net: convert bridge_nf to use skb extension infrastructure 

This converts the bridge netfilter (calling iptables hooks from bridge)
facility to use the extension infrastructure.

The bridge_nf specific hooks in skb clone and free paths are removed, they
have been replaced by the skb_ext hooks that do the same as the bridge nf
allocations hooks did.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2018-12-18 17:15:17 +01:00 committed by David S. Miller
parent df5042f4c5
commit de8bda1d22
7 changed files with 13 additions and 55 deletions
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4
include/linux/netfilter_bridge.h
View File

@ -20,12 +20,12 @@ static inline void br_drop_fake_rtable(struct sk_buff *skb)
static inline struct nf_bridge_info *
nf_bridge_info_get(const struct sk_buff *skb)
{
return skb->nf_bridge;
return skb_ext_find(skb, SKB_EXT_BRIDGE_NF);
}
static inline bool nf_bridge_info_exists(const struct sk_buff *skb)
{
return skb->nf_bridge != NULL;
return skb_ext_exist(skb, SKB_EXT_BRIDGE_NF);
}
static inline int nf_bridge_get_physinif(const struct sk_buff *skb)

28
include/linux/skbuff.h
View File

@ -255,7 +255,6 @@ struct nf_conntrack {
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
struct nf_bridge_info {
refcount_t use;
enum {
BRNF_PROTO_UNCHANGED,
BRNF_PROTO_8021Q,
@ -720,9 +719,6 @@ struct sk_buff {
#endif
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
unsigned long _nfct;
#endif
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
struct nf_bridge_info *nf_bridge;
#endif
unsigned int len,
data_len;
@ -4005,18 +4001,6 @@ static inline void __skb_ext_copy(struct sk_buff *d, const struct sk_buff *s) {}
static inline void skb_ext_copy(struct sk_buff *dst, const struct sk_buff *s) {}
#endif /* CONFIG_SKB_EXTENSIONS */
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
static inline void nf_bridge_put(struct nf_bridge_info *nf_bridge)
{
if (nf_bridge && refcount_dec_and_test(&nf_bridge->use))
kfree(nf_bridge);
}
static inline void nf_bridge_get(struct nf_bridge_info *nf_bridge)
{
if (nf_bridge)
refcount_inc(&nf_bridge->use);
}
#endif /* CONFIG_BRIDGE_NETFILTER */
static inline void nf_reset(struct sk_buff *skb)
{
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
@ -4024,8 +4008,7 @@ static inline void nf_reset(struct sk_buff *skb)
skb->_nfct = 0;
#endif
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
nf_bridge_put(skb->nf_bridge);
skb->nf_bridge = NULL;
skb_ext_del(skb, SKB_EXT_BRIDGE_NF);
#endif
}
@ -4043,7 +4026,7 @@ static inline void ipvs_reset(struct sk_buff *skb)
#endif
}
/* Note: This doesn't put any conntrack and bridge info in dst. */
/* Note: This doesn't put any conntrack info in dst. */
static inline void __nf_copy(struct sk_buff *dst, const struct sk_buff *src,
bool copy)
{
@ -4051,10 +4034,6 @@ static inline void __nf_copy(struct sk_buff *dst, const struct sk_buff *src,
dst->_nfct = src->_nfct;
nf_conntrack_get(skb_nfct(src));
#endif
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
dst->nf_bridge = src->nf_bridge;
nf_bridge_get(src->nf_bridge);
#endif
#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) || defined(CONFIG_NF_TABLES)
if (copy)
dst->nf_trace = src->nf_trace;
@ -4065,9 +4044,6 @@ static inline void nf_copy(struct sk_buff *dst, const struct sk_buff *src)
{
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
nf_conntrack_put(skb_nfct(dst));
#endif
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
nf_bridge_put(dst->nf_bridge);
#endif
__nf_copy(dst, src, true);
}

8
include/net/netfilter/br_netfilter.h
View File

@ -6,12 +6,12 @@
static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)
{
skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC);
struct nf_bridge_info *b = skb_ext_add(skb, SKB_EXT_BRIDGE_NF);
if (likely(skb->nf_bridge))
refcount_set(&(skb->nf_bridge->use), 1);
if (b)
memset(b, 0, sizeof(*b));
return skb->nf_bridge;
return b;
}
void nf_bridge_update_protocol(struct sk_buff *skb);

1
net/Kconfig
View File

@ -187,6 +187,7 @@ config BRIDGE_NETFILTER
depends on NETFILTER && INET
depends on NETFILTER_ADVANCED
select NETFILTER_FAMILY_BRIDGE
select SKB_EXTENSIONS
default m
---help---
Enabling this option will let arptables resp. iptables see bridged

20
net/bridge/br_netfilter_hooks.c
View File

@ -132,10 +132,7 @@ static DEFINE_PER_CPU(struct brnf_frag_data, brnf_frag_data_storage);
static void nf_bridge_info_free(struct sk_buff *skb)
{
if (skb->nf_bridge) {
nf_bridge_put(skb->nf_bridge);
skb->nf_bridge = NULL;
}
skb_ext_del(skb, SKB_EXT_BRIDGE_NF);
}
static inline struct net_device *bridge_parent(const struct net_device *dev)
@ -148,19 +145,7 @@ static inline struct net_device *bridge_parent(const struct net_device *dev)
static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb)
{
struct nf_bridge_info *nf_bridge = skb->nf_bridge;
if (refcount_read(&nf_bridge->use) > 1) {
struct nf_bridge_info *tmp = nf_bridge_alloc(skb);
if (tmp) {
memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info));
refcount_set(&tmp->use, 1);
}
nf_bridge_put(nf_bridge);
nf_bridge = tmp;
}
return nf_bridge;
return skb_ext_add(skb, SKB_EXT_BRIDGE_NF);
}
unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
@ -508,7 +493,6 @@ static unsigned int br_nf_pre_routing(void *priv,
if (br_validate_ipv4(state->net, skb))
return NF_DROP;
nf_bridge_put(skb->nf_bridge);
if (!nf_bridge_alloc(skb))
return NF_DROP;
if (!setup_pre_routing(skb))

4
net/bridge/br_netfilter_ipv6.c
View File

@ -224,8 +224,8 @@ unsigned int br_nf_pre_routing_ipv6(void *priv,
if (br_validate_ipv6(state->net, skb))
return NF_DROP;
nf_bridge_put(skb->nf_bridge);
if (!nf_bridge_alloc(skb))
nf_bridge = nf_bridge_alloc(skb);
if (!nf_bridge)
return NF_DROP;
if (!setup_pre_routing(skb))
return NF_DROP;

3
net/core/skbuff.c
View File

@ -616,9 +616,6 @@ void skb_release_head_state(struct sk_buff *skb)
}
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
nf_conntrack_put(skb_nfct(skb));
#endif
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
nf_bridge_put(skb->nf_bridge);
#endif
skb_ext_put(skb);
}