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netfilter: bridge: make BRNF_PKT_TYPE flag a bool

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nf_bridge_info->mask is used for several things, for example to
remember if skb->pkt_type was set to OTHER_HOST.

For a bridge, OTHER_HOST is expected case. For ip forward its a non-starter
though -- routing expects PACKET_HOST.

Bridge netfilter thus changes OTHER_HOST to PACKET_HOST before hook
invocation and then un-does it after hook traversal.

This information is irrelevant outside of br_netfilter.

After this change, ->mask now only contains flags that need to be
known outside of br_netfilter in fast-path.

Future patch changes mask into a 2bit state field in sk_buff, so that
we can remove skb->nf_bridge pointer for good and consider all remaining
places that access nf_bridge info content a not-so fastpath.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2015-04-02 14:31:45 +02:00 committed by Pablo Neira Ayuso
parent 3eaf402502
commit a1e67951e6
3 changed files with 10 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/netfilter_bridge.h
View File

@ -17,7 +17,6 @@ enum nf_br_hook_priorities {
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
#define BRNF_PKT_TYPE 0x01
#define BRNF_BRIDGED_DNAT 0x02
#define BRNF_NF_BRIDGE_PREROUTING 0x08

1
include/linux/skbuff.h
View File

@ -171,6 +171,7 @@ struct nf_bridge_info {
BRNF_PROTO_8021Q,
BRNF_PROTO_PPPOE
} orig_proto;
bool pkt_otherhost;
unsigned int mask;
struct net_device *physindev;
struct net_device *physoutdev;

18
net/bridge/br_netfilter.c
View File

@ -282,9 +282,9 @@ static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb)
struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
struct rtable *rt;
if (nf_bridge->mask & BRNF_PKT_TYPE) {
if (nf_bridge->pkt_otherhost) {
skb->pkt_type = PACKET_OTHERHOST;
nf_bridge->mask ^= BRNF_PKT_TYPE;
nf_bridge->pkt_otherhost = false;
}
nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
@ -415,9 +415,9 @@ static int br_nf_pre_routing_finish(struct sk_buff *skb)
frag_max_size = IPCB(skb)->frag_max_size;
BR_INPUT_SKB_CB(skb)->frag_max_size = frag_max_size;
if (nf_bridge->mask & BRNF_PKT_TYPE) {
if (nf_bridge->pkt_otherhost) {
skb->pkt_type = PACKET_OTHERHOST;
nf_bridge->mask ^= BRNF_PKT_TYPE;
nf_bridge->pkt_otherhost = false;
}
nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
if (dnat_took_place(skb)) {
@ -503,7 +503,7 @@ static struct net_device *setup_pre_routing(struct sk_buff *skb)
if (skb->pkt_type == PACKET_OTHERHOST) {
skb->pkt_type = PACKET_HOST;
nf_bridge->mask |= BRNF_PKT_TYPE;
nf_bridge->pkt_otherhost = true;
}
nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING;
@ -711,9 +711,9 @@ static int br_nf_forward_finish(struct sk_buff *skb)
}
in = nf_bridge->physindev;
if (nf_bridge->mask & BRNF_PKT_TYPE) {
if (nf_bridge->pkt_otherhost) {
skb->pkt_type = PACKET_OTHERHOST;
nf_bridge->mask ^= BRNF_PKT_TYPE;
nf_bridge->pkt_otherhost = false;
}
nf_bridge_update_protocol(skb);
} else {
@ -769,7 +769,7 @@ static unsigned int br_nf_forward_ip(const struct nf_hook_ops *ops,
if (skb->pkt_type == PACKET_OTHERHOST) {
skb->pkt_type = PACKET_HOST;
nf_bridge->mask |= BRNF_PKT_TYPE;
nf_bridge->pkt_otherhost = true;
}
if (pf == NFPROTO_IPV4) {
@ -927,7 +927,7 @@ static unsigned int br_nf_post_routing(const struct nf_hook_ops *ops,
* about the value of skb->pkt_type. */
if (skb->pkt_type == PACKET_OTHERHOST) {
skb->pkt_type = PACKET_HOST;
nf_bridge->mask |= BRNF_PKT_TYPE;
nf_bridge->pkt_otherhost = true;
}
nf_bridge_pull_encap_header(skb);