From 72b1e5e4cac72efa6b739b47e41f53e4520b4194 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Thu, 23 Jul 2015 16:21:30 +0200 Subject: netfilter: bridge: reduce nf_bridge_info to 32 bytes again We can use union for most of the temporary cruft (original ipv4/ipv6 address, source mac, physoutdev) since they're used during different stages of br netfilter traversal. Also get rid of the last two ->mask users. Shrinks struct from 48 to 32 on 64bit arch. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- include/linux/netfilter_bridge.h | 12 +++++++++--- include/linux/skbuff.h | 19 +++++++++++++------ 2 files changed, 22 insertions(+), 9 deletions(-) (limited to 'include/linux') 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 -- cgit v1.2.3