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-rw-r--r--include/linux/netfilter_bridge.h12
-rw-r--r--include/linux/skbuff.h19
-rw-r--r--net/bridge/br_netfilter_hooks.c14
-rw-r--r--net/bridge/br_netfilter_ipv6.c2
-rw-r--r--net/ipv4/netfilter/nf_defrag_ipv4.c7
-rw-r--r--net/ipv6/netfilter/nf_defrag_ipv6_hooks.c7
6 files changed, 33 insertions, 28 deletions
diff --git a/include/linux/netfilter_bridge.h b/include/linux/netfilter_bridge.h
index 6d80fc686323..2437b8a5d7a9 100644
--- a/include/linux/netfilter_bridge.h
+++ b/include/linux/netfilter_bridge.h
@@ -17,9 +17,6 @@ enum nf_br_hook_priorities {
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
-#define BRNF_BRIDGED_DNAT 0x02
-#define BRNF_NF_BRIDGE_PREROUTING 0x08
-
int br_handle_frame_finish(struct sock *sk, struct sk_buff *skb);
static inline void br_drop_fake_rtable(struct sk_buff *skb)
@@ -63,8 +60,17 @@ nf_bridge_get_physoutdev(const struct sk_buff *skb)
{
return skb->nf_bridge ? skb->nf_bridge->physoutdev : NULL;
}
+
+static inline bool nf_bridge_in_prerouting(const struct sk_buff *skb)
+{
+ return skb->nf_bridge && skb->nf_bridge->in_prerouting;
+}
#else
#define br_drop_fake_rtable(skb) do { } while (0)
+static inline bool nf_bridge_in_prerouting(const struct sk_buff *skb)
+{
+ return false;
+}
#endif /* CONFIG_BRIDGE_NETFILTER */
#endif
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index d6cdd6e87d53..ac732e67a6c8 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -173,17 +173,24 @@ struct nf_bridge_info {
BRNF_PROTO_8021Q,
BRNF_PROTO_PPPOE
} orig_proto:8;
- bool pkt_otherhost;
+ u8 pkt_otherhost:1;
+ u8 in_prerouting:1;
+ u8 bridged_dnat:1;
__u16 frag_max_size;
- unsigned int mask;
struct net_device *physindev;
union {
- struct net_device *physoutdev;
- char neigh_header[8];
- };
- union {
+ /* prerouting: detect dnat in orig/reply direction */
__be32 ipv4_daddr;
struct in6_addr ipv6_daddr;
+
+ /* after prerouting + nat detected: store original source
+ * mac since neigh resolution overwrites it, only used while
+ * skb is out in neigh layer.
+ */
+ char neigh_header[8];
+
+ /* always valid & non-NULL from FORWARD on, for physdev match */
+ struct net_device *physoutdev;
};
};
#endif
diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_hooks.c
index c8b9bcfe997e..ec51c2ba30e9 100644
--- a/net/bridge/br_netfilter_hooks.c
+++ b/net/bridge/br_netfilter_hooks.c
@@ -284,7 +284,7 @@ int br_nf_pre_routing_finish_bridge(struct sock *sk, struct sk_buff *skb)
nf_bridge->neigh_header,
ETH_HLEN-ETH_ALEN);
/* tell br_dev_xmit to continue with forwarding */
- nf_bridge->mask |= BRNF_BRIDGED_DNAT;
+ nf_bridge->bridged_dnat = 1;
/* FIXME Need to refragment */
ret = neigh->output(neigh, skb);
}
@@ -356,7 +356,7 @@ static int br_nf_pre_routing_finish(struct sock *sk, struct sk_buff *skb)
skb->pkt_type = PACKET_OTHERHOST;
nf_bridge->pkt_otherhost = false;
}
- nf_bridge->mask &= ~BRNF_NF_BRIDGE_PREROUTING;
+ nf_bridge->in_prerouting = 0;
if (br_nf_ipv4_daddr_was_changed(skb, nf_bridge)) {
if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) {
struct in_device *in_dev = __in_dev_get_rcu(dev);
@@ -444,7 +444,7 @@ struct net_device *setup_pre_routing(struct sk_buff *skb)
nf_bridge->pkt_otherhost = true;
}
- nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING;
+ nf_bridge->in_prerouting = 1;
nf_bridge->physindev = skb->dev;
skb->dev = brnf_get_logical_dev(skb, skb->dev);
@@ -850,10 +850,8 @@ static unsigned int ip_sabotage_in(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
- if (skb->nf_bridge &&
- !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) {
+ if (skb->nf_bridge && !skb->nf_bridge->in_prerouting)
return NF_STOP;
- }
return NF_ACCEPT;
}
@@ -872,7 +870,7 @@ static void br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb)
struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
skb_pull(skb, ETH_HLEN);
- nf_bridge->mask &= ~BRNF_BRIDGED_DNAT;
+ nf_bridge->bridged_dnat = 0;
BUILD_BUG_ON(sizeof(nf_bridge->neigh_header) != (ETH_HLEN - ETH_ALEN));
@@ -887,7 +885,7 @@ static void br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb)
static int br_nf_dev_xmit(struct sk_buff *skb)
{
- if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
+ if (skb->nf_bridge && skb->nf_bridge->bridged_dnat) {
br_nf_pre_routing_finish_bridge_slow(skb);
return 1;
}
diff --git a/net/bridge/br_netfilter_ipv6.c b/net/bridge/br_netfilter_ipv6.c
index 13b7d1e3d185..77383bfe7ea3 100644
--- a/net/bridge/br_netfilter_ipv6.c
+++ b/net/bridge/br_netfilter_ipv6.c
@@ -174,7 +174,7 @@ static int br_nf_pre_routing_finish_ipv6(struct sock *sk, struct sk_buff *skb)
skb->pkt_type = PACKET_OTHERHOST;
nf_bridge->pkt_otherhost = false;
}
- nf_bridge->mask &= ~BRNF_NF_BRIDGE_PREROUTING;
+ nf_bridge->in_prerouting = 0;
if (br_nf_ipv6_daddr_was_changed(skb, nf_bridge)) {
skb_dst_drop(skb);
v6ops->route_input(skb);
diff --git a/net/ipv4/netfilter/nf_defrag_ipv4.c b/net/ipv4/netfilter/nf_defrag_ipv4.c
index c88b7d434718..b69e82bda215 100644
--- a/net/ipv4/netfilter/nf_defrag_ipv4.c
+++ b/net/ipv4/netfilter/nf_defrag_ipv4.c
@@ -49,12 +49,9 @@ static enum ip_defrag_users nf_ct_defrag_user(unsigned int hooknum,
if (skb->nfct)
zone = nf_ct_zone((struct nf_conn *)skb->nfct);
#endif
-
-#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
- if (skb->nf_bridge &&
- skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)
+ if (nf_bridge_in_prerouting(skb))
return IP_DEFRAG_CONNTRACK_BRIDGE_IN + zone;
-#endif
+
if (hooknum == NF_INET_PRE_ROUTING)
return IP_DEFRAG_CONNTRACK_IN + zone;
else
diff --git a/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c b/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c
index a45db0b4785c..267fb8d5876e 100644
--- a/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c
+++ b/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c
@@ -39,12 +39,9 @@ static enum ip6_defrag_users nf_ct6_defrag_user(unsigned int hooknum,
if (skb->nfct)
zone = nf_ct_zone((struct nf_conn *)skb->nfct);
#endif
-
-#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
- if (skb->nf_bridge &&
- skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)
+ if (nf_bridge_in_prerouting(skb))
return IP6_DEFRAG_CONNTRACK_BRIDGE_IN + zone;
-#endif
+
if (hooknum == NF_INET_PRE_ROUTING)
return IP6_DEFRAG_CONNTRACK_IN + zone;
else
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.