Currently frag_max_size is member of br_input_skb_cb and copied back and
forth using IPCB(skb) and BR_INPUT_SKB_CB(skb) each time it is changed or
used.
Attach frag_max_size to nf_bridge_info and set value in pre_routing and
forward functions. Use its value in forward and xmit functions.
Signed-off-by: Bernhard Thaler <bernhard.thaler@xxxxxxxx>
---
Patch revision history:
v2
* put this patch in front of patch series about IPv6 fragmentation
include/linux/skbuff.h | 1 +
net/bridge/br_netfilter.c | 20 +++++++-------------
net/bridge/br_private.h | 1 -
3 files changed, 8 insertions(+), 14 deletions(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 5b57cee..90b62a2 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -174,6 +174,7 @@ struct nf_bridge_info {
BRNF_PROTO_PPPOE
} orig_proto:8;
bool pkt_otherhost;
+ __u16 frag_max_size;
unsigned int mask;
struct net_device *physindev;
union {
diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index 9ac0c64..1f30b28 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -440,10 +440,8 @@ static int br_nf_pre_routing_finish(struct sock *sk, struct sk_buff *skb)
struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
struct rtable *rt;
int err;
- int frag_max_size;
- frag_max_size = IPCB(skb)->frag_max_size;
- BR_INPUT_SKB_CB(skb)->frag_max_size = frag_max_size;
+ nf_bridge->frag_max_size = IPCB(skb)->frag_max_size;
if (nf_bridge->pkt_otherhost) {
skb->pkt_type = PACKET_OTHERHOST;
@@ -738,11 +736,9 @@ static int br_nf_forward_finish(struct sock *sk, struct sk_buff *skb)
struct net_device *in;
if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) {
- int frag_max_size;
if (skb->protocol == htons(ETH_P_IP)) {
- frag_max_size = IPCB(skb)->frag_max_size;
- BR_INPUT_SKB_CB(skb)->frag_max_size = frag_max_size;
+ nf_bridge->frag_max_size = IPCB(skb)->frag_max_size;
}
in = nf_bridge->physindev;
@@ -806,12 +802,9 @@ static unsigned int br_nf_forward_ip(const struct nf_hook_ops *ops,
}
if (pf == NFPROTO_IPV4) {
- int frag_max = BR_INPUT_SKB_CB(skb)->frag_max_size;
-
if (br_parse_ip_options(skb))
return NF_DROP;
-
- IPCB(skb)->frag_max_size = frag_max;
+ IPCB(skb)->frag_max_size = nf_bridge->frag_max_size;
}
nf_bridge->physoutdev = skb->dev;
@@ -904,7 +897,7 @@ static int br_nf_ip_fragment(struct sock *sk, struct sk_buff *skb,
static int br_nf_dev_queue_xmit(struct sock *sk, struct sk_buff *skb)
{
int ret;
- int frag_max_size;
+ struct nf_bridge_info *nf_bridge;
unsigned int mtu_reserved;
if (skb_is_gso(skb) || skb->protocol != htons(ETH_P_IP)) {
@@ -913,17 +906,18 @@ static int br_nf_dev_queue_xmit(struct sock *sk, struct sk_buff *skb)
}
mtu_reserved = nf_bridge_mtu_reduction(skb);
+ nf_bridge = nf_bridge_info_get(skb);
/* This is wrong! We should preserve the original fragment
* boundaries by preserving frag_list rather than refragmenting.
*/
if (skb->len + mtu_reserved > skb->dev->mtu) {
struct brnf_frag_data *data;
- frag_max_size = BR_INPUT_SKB_CB(skb)->frag_max_size;
if (br_parse_ip_options(skb))
/* Drop invalid packet */
return NF_DROP;
- IPCB(skb)->frag_max_size = frag_max_size;
+
+ IPCB(skb)->frag_max_size = nf_bridge->frag_max_size;
nf_bridge_update_protocol(skb);
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 1f36fa7..8cde96e 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -304,7 +304,6 @@ struct br_input_skb_cb {
int mrouters_only;
#endif
- u16 frag_max_size;
bool proxyarp_replied;
#ifdef CONFIG_BRIDGE_VLAN_FILTERING
--
1.7.10.4
--
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