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Message-Id: <20190411143642.1087-3-fw@strlen.de>
Date: Thu, 11 Apr 2019 16:36:40 +0200
From: Florian Westphal <fw@...len.de>
To: <netfilter-devel@...r.kernel.org>
Cc: roopa@...ulusnetworks.com, nikolay@...ulusnetworks.com,
<netdev@...r.kernel.org>, Florian Westphal <fw@...len.de>
Subject: [PATCH nf-next 2/4] bridge: reduce size of input cb to 16 bytes
Reduce size of br_input_skb_cb from 24 to 16 bytes by
using bitfield for those values that can only be 0 or 1.
igmp is the igmp type value, so it needs to be at least u8.
Furthermore, the bridge currently relies on step-by-step initialization
of br_input_skb_cb fields as the skb passes through the stack.
Explicitly zero out the bridge input cb instead, this avoids having to
review/validate that no BR_INPUT_SKB_CB(skb)->foo test can see a
'random' value from previous protocol cb.
AFAICS all current fields are always set up before they are read again,
so this is not a bug fix.
Cc: Roopa Prabhu <roopa@...ulusnetworks.com>
Cc: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Signed-off-by: Florian Westphal <fw@...len.de>
---
net/bridge/br_arp_nd_proxy.c | 18 +++++++++---------
net/bridge/br_input.c | 2 ++
net/bridge/br_private.h | 12 +++++-------
3 files changed, 16 insertions(+), 16 deletions(-)
diff --git a/net/bridge/br_arp_nd_proxy.c b/net/bridge/br_arp_nd_proxy.c
index 724b474ade54..15116752365a 100644
--- a/net/bridge/br_arp_nd_proxy.c
+++ b/net/bridge/br_arp_nd_proxy.c
@@ -131,7 +131,7 @@ void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
u8 *arpptr, *sha;
__be32 sip, tip;
- BR_INPUT_SKB_CB(skb)->proxyarp_replied = false;
+ BR_INPUT_SKB_CB(skb)->proxyarp_replied = 0;
if ((dev->flags & IFF_NOARP) ||
!pskb_may_pull(skb, arp_hdr_len(dev)))
@@ -161,7 +161,7 @@ void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
return;
if (ipv4_is_zeronet(sip) || sip == tip) {
/* prevent flooding to neigh suppress ports */
- BR_INPUT_SKB_CB(skb)->proxyarp_replied = true;
+ BR_INPUT_SKB_CB(skb)->proxyarp_replied = 1;
return;
}
}
@@ -181,7 +181,7 @@ void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
/* its our local ip, so don't proxy reply
* and don't forward to neigh suppress ports
*/
- BR_INPUT_SKB_CB(skb)->proxyarp_replied = true;
+ BR_INPUT_SKB_CB(skb)->proxyarp_replied = 1;
return;
}
@@ -217,7 +217,7 @@ void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
*/
if (replied ||
br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED))
- BR_INPUT_SKB_CB(skb)->proxyarp_replied = true;
+ BR_INPUT_SKB_CB(skb)->proxyarp_replied = 1;
}
neigh_release(n);
@@ -393,7 +393,7 @@ void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
struct ipv6hdr *iphdr;
struct neighbour *n;
- BR_INPUT_SKB_CB(skb)->proxyarp_replied = false;
+ BR_INPUT_SKB_CB(skb)->proxyarp_replied = 0;
if (p && (p->flags & BR_NEIGH_SUPPRESS))
return;
@@ -401,7 +401,7 @@ void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
if (msg->icmph.icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT &&
!msg->icmph.icmp6_solicited) {
/* prevent flooding to neigh suppress ports */
- BR_INPUT_SKB_CB(skb)->proxyarp_replied = true;
+ BR_INPUT_SKB_CB(skb)->proxyarp_replied = 1;
return;
}
@@ -414,7 +414,7 @@ void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
if (ipv6_addr_any(saddr) || !ipv6_addr_cmp(saddr, daddr)) {
/* prevent flooding to neigh suppress ports */
- BR_INPUT_SKB_CB(skb)->proxyarp_replied = true;
+ BR_INPUT_SKB_CB(skb)->proxyarp_replied = 1;
return;
}
@@ -432,7 +432,7 @@ void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
/* its our own ip, so don't proxy reply
* and don't forward to arp suppress ports
*/
- BR_INPUT_SKB_CB(skb)->proxyarp_replied = true;
+ BR_INPUT_SKB_CB(skb)->proxyarp_replied = 1;
return;
}
@@ -465,7 +465,7 @@ void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
*/
if (replied ||
br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED))
- BR_INPUT_SKB_CB(skb)->proxyarp_replied = true;
+ BR_INPUT_SKB_CB(skb)->proxyarp_replied = 1;
}
neigh_release(n);
}
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 5ea7e56119c1..e2f93e5c72da 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -227,6 +227,8 @@ rx_handler_result_t br_handle_frame(struct sk_buff **pskb)
if (!skb)
return RX_HANDLER_CONSUMED;
+ memset(skb->cb, 0, sizeof(struct br_input_skb_cb));
+
p = br_port_get_rcu(skb->dev);
if (p->flags & BR_VLAN_TUNNEL) {
if (br_handle_ingress_vlan_tunnel(skb, p,
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 7946aa3b6e09..e7110a6e2b7e 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -425,15 +425,13 @@ struct br_input_skb_cb {
struct net_device *brdev;
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
- int igmp;
- int mrouters_only;
+ u8 igmp;
+ u8 mrouters_only:1;
#endif
-
- bool proxyarp_replied;
- bool src_port_isolated;
-
+ u8 proxyarp_replied:1;
+ u8 src_port_isolated:1;
#ifdef CONFIG_BRIDGE_VLAN_FILTERING
- bool vlan_filtered;
+ u8 vlan_filtered:1;
#endif
#ifdef CONFIG_NET_SWITCHDEV
--
2.21.0
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