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-rw-r--r--include/linux/netdevice.h4
-rw-r--r--include/linux/netfilter_netdev.h27
-rw-r--r--include/uapi/linux/netfilter.h1
-rw-r--r--net/core/dev.c23
-rw-r--r--net/netfilter/Kconfig8
-rw-r--r--net/netfilter/core.c24
-rw-r--r--net/netfilter/nft_chain_filter.c4
7 files changed, 83 insertions, 8 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 654808bfad83..15f1e32b430c 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1751,6 +1751,7 @@ enum netdev_priv_flags {
* @xps_maps: XXX: need comments on this one
* @miniq_egress: clsact qdisc specific data for
* egress processing
+ * @nf_hooks_egress: netfilter hooks executed for egress packets
* @qdisc_hash: qdisc hash table
* @watchdog_timeo: Represents the timeout that is used by
* the watchdog (see dev_watchdog())
@@ -2026,6 +2027,9 @@ struct net_device {
#ifdef CONFIG_NET_CLS_ACT
struct mini_Qdisc __rcu *miniq_egress;
#endif
+#ifdef CONFIG_NETFILTER_EGRESS
+ struct nf_hook_entries __rcu *nf_hooks_egress;
+#endif
#ifdef CONFIG_NET_SCHED
DECLARE_HASHTABLE (qdisc_hash, 4);
diff --git a/include/linux/netfilter_netdev.h b/include/linux/netfilter_netdev.h
index 49e26479642e..92d3611a782e 100644
--- a/include/linux/netfilter_netdev.h
+++ b/include/linux/netfilter_netdev.h
@@ -47,6 +47,9 @@ static inline void nf_hook_netdev_init(struct net_device *dev)
#ifdef CONFIG_NETFILTER_INGRESS
RCU_INIT_POINTER(dev->nf_hooks_ingress, NULL);
#endif
+#ifdef CONFIG_NETFILTER_EGRESS
+ RCU_INIT_POINTER(dev->nf_hooks_egress, NULL);
+#endif
}
#ifdef CONFIG_NETFILTER_INGRESS
@@ -72,4 +75,28 @@ static inline int nf_hook_ingress(struct sk_buff *skb)
return 0;
}
#endif /* CONFIG_NETFILTER_INGRESS */
+
+#ifdef CONFIG_NETFILTER_EGRESS
+static inline bool nf_hook_egress_active(const struct sk_buff *skb)
+{
+ return nf_hook_netdev_active(NF_NETDEV_EGRESS,
+ skb->dev->nf_hooks_egress);
+}
+
+static inline int nf_hook_egress(struct sk_buff *skb)
+{
+ return nf_hook_netdev(skb, NF_NETDEV_EGRESS,
+ skb->dev->nf_hooks_egress);
+}
+#else /* CONFIG_NETFILTER_EGRESS */
+static inline int nf_hook_egress_active(struct sk_buff *skb)
+{
+ return 0;
+}
+
+static inline int nf_hook_egress(struct sk_buff *skb)
+{
+ return 0;
+}
+#endif /* CONFIG_NETFILTER_EGRESS */
#endif /* _NETFILTER_INGRESS_H_ */
diff --git a/include/uapi/linux/netfilter.h b/include/uapi/linux/netfilter.h
index ca9e63d6e0e4..d1616574c54f 100644
--- a/include/uapi/linux/netfilter.h
+++ b/include/uapi/linux/netfilter.h
@@ -50,6 +50,7 @@ enum nf_inet_hooks {
enum nf_dev_hooks {
NF_NETDEV_INGRESS,
+ NF_NETDEV_EGRESS,
NF_NETDEV_NUMHOOKS
};
diff --git a/net/core/dev.c b/net/core/dev.c
index 13d562f67e9c..a2da72a77c20 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3773,6 +3773,7 @@ EXPORT_SYMBOL(dev_loopback_xmit);
static struct sk_buff *
sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev)
{
+#ifdef CONFIG_NET_CLS_ACT
struct mini_Qdisc *miniq = rcu_dereference_bh(dev->miniq_egress);
struct tcf_result cl_res;
@@ -3806,11 +3807,24 @@ sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev)
default:
break;
}
-
+#endif /* CONFIG_NET_CLS_ACT */
return skb;
}
#endif /* CONFIG_NET_EGRESS */
+static inline int nf_egress(struct sk_buff *skb)
+{
+ if (nf_hook_egress_active(skb)) {
+ int ret;
+
+ rcu_read_lock();
+ ret = nf_hook_egress(skb);
+ rcu_read_unlock();
+ return ret;
+ }
+ return 0;
+}
+
#ifdef CONFIG_XPS
static int __get_xps_queue_idx(struct net_device *dev, struct sk_buff *skb,
struct xps_dev_maps *dev_maps, unsigned int tci)
@@ -3997,13 +4011,16 @@ static int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev)
qdisc_pkt_len_init(skb);
#ifdef CONFIG_NET_CLS_ACT
skb->tc_at_ingress = 0;
-# ifdef CONFIG_NET_EGRESS
+#endif
+#ifdef CONFIG_NET_EGRESS
if (static_branch_unlikely(&egress_needed_key)) {
+ if (nf_egress(skb) < 0)
+ goto out;
+
skb = sch_handle_egress(skb, &rc, dev);
if (!skb)
goto out;
}
-# endif
#endif
/* If device/qdisc don't need skb->dst, release it right now while
* its hot in this cpu cache.
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 468fea1aebba..f4c68f60f241 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -10,6 +10,14 @@ config NETFILTER_INGRESS
This allows you to classify packets from ingress using the Netfilter
infrastructure.
+config NETFILTER_EGRESS
+ bool "Netfilter egress support"
+ default y
+ select NET_EGRESS
+ help
+ This allows you to classify packets before transmission using the
+ Netfilter infrastructure.
+
config NETFILTER_NETLINK
tristate
diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 78f046ec506f..85e9c959aba7 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -307,6 +307,12 @@ nf_hook_entry_head(struct net *net, int pf, unsigned int hooknum,
return &dev->nf_hooks_ingress;
}
#endif
+#ifdef CONFIG_NETFILTER_EGRESS
+ if (hooknum == NF_NETDEV_EGRESS) {
+ if (dev && dev_net(dev) == net)
+ return &dev->nf_hooks_egress;
+ }
+#endif
WARN_ON_ONCE(1);
return NULL;
}
@@ -318,11 +324,13 @@ static int __nf_register_net_hook(struct net *net, int pf,
struct nf_hook_entries __rcu **pp;
if (pf == NFPROTO_NETDEV) {
-#ifndef CONFIG_NETFILTER_INGRESS
- if (reg->hooknum == NF_NETDEV_INGRESS)
+ if ((!IS_ENABLED(CONFIG_NETFILTER_INGRESS) &&
+ reg->hooknum == NF_NETDEV_INGRESS) ||
+ (!IS_ENABLED(CONFIG_NETFILTER_EGRESS) &&
+ reg->hooknum == NF_NETDEV_EGRESS))
return -EOPNOTSUPP;
-#endif
- if (reg->hooknum != NF_NETDEV_INGRESS ||
+ if ((reg->hooknum != NF_NETDEV_INGRESS &&
+ reg->hooknum != NF_NETDEV_EGRESS) ||
!reg->dev || dev_net(reg->dev) != net)
return -EINVAL;
}
@@ -348,6 +356,10 @@ static int __nf_register_net_hook(struct net *net, int pf,
if (pf == NFPROTO_NETDEV && reg->hooknum == NF_NETDEV_INGRESS)
net_inc_ingress_queue();
#endif
+#ifdef CONFIG_NETFILTER_EGRESS
+ if (pf == NFPROTO_NETDEV && reg->hooknum == NF_NETDEV_EGRESS)
+ net_inc_egress_queue();
+#endif
#ifdef CONFIG_JUMP_LABEL
static_key_slow_inc(&nf_hooks_needed[pf][reg->hooknum]);
#endif
@@ -406,6 +418,10 @@ static void __nf_unregister_net_hook(struct net *net, int pf,
if (pf == NFPROTO_NETDEV && reg->hooknum == NF_NETDEV_INGRESS)
net_dec_ingress_queue();
#endif
+#ifdef CONFIG_NETFILTER_EGRESS
+ if (pf == NFPROTO_NETDEV && reg->hooknum == NF_NETDEV_EGRESS)
+ net_dec_egress_queue();
+#endif
#ifdef CONFIG_JUMP_LABEL
static_key_slow_dec(&nf_hooks_needed[pf][reg->hooknum]);
#endif
diff --git a/net/netfilter/nft_chain_filter.c b/net/netfilter/nft_chain_filter.c
index c78d01bc02e9..67ce6dbb5496 100644
--- a/net/netfilter/nft_chain_filter.c
+++ b/net/netfilter/nft_chain_filter.c
@@ -277,9 +277,11 @@ static const struct nft_chain_type nft_chain_filter_netdev = {
.name = "filter",
.type = NFT_CHAIN_T_DEFAULT,
.family = NFPROTO_NETDEV,
- .hook_mask = (1 << NF_NETDEV_INGRESS),
+ .hook_mask = (1 << NF_NETDEV_INGRESS) |
+ (1 << NF_NETDEV_EGRESS),
.hooks = {
[NF_NETDEV_INGRESS] = nft_do_chain_netdev,
+ [NF_NETDEV_EGRESS] = nft_do_chain_netdev,
},
};
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-06 11:48:00 +0000