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netfilter: bridge: refactor frag_max_size 

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@wvnet.at>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Bernhard Thaler 2015-05-30 15:28:28 +02:00 коммит произвёл Pablo Neira Ayuso
Родитель 72b31f7271
Коммит 411ffb4fde
3 изменённых файлов: 8 добавлений и 14 удалений
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1
include/linux/skbuff.h
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@ -174,6 +174,7 @@ struct nf_bridge_info {
BRNF_PROTO_PPPOE BRNF_PROTO_PPPOE
} orig_proto:8; } orig_proto:8;
bool pkt_otherhost; bool pkt_otherhost;
__u16 frag_max_size;
unsigned int mask; unsigned int mask;
struct net_device *physindev; struct net_device *physindev;
union { union {

20
net/bridge/br_netfilter.c
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@ -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 nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
struct rtable *rt; struct rtable *rt;
int err; int err;
int frag_max_size;
frag_max_size = IPCB(skb)->frag_max_size; nf_bridge->frag_max_size = IPCB(skb)->frag_max_size;
BR_INPUT_SKB_CB(skb)->frag_max_size = frag_max_size;
if (nf_bridge->pkt_otherhost) { if (nf_bridge->pkt_otherhost) {
skb->pkt_type = PACKET_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; struct net_device *in;
if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) { if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) {
int frag_max_size;
if (skb->protocol == htons(ETH_P_IP)) { if (skb->protocol == htons(ETH_P_IP)) {
frag_max_size = IPCB(skb)->frag_max_size; nf_bridge->frag_max_size = IPCB(skb)->frag_max_size;
BR_INPUT_SKB_CB(skb)->frag_max_size = frag_max_size;
} }
in = nf_bridge->physindev; 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) { if (pf == NFPROTO_IPV4) {
int frag_max = BR_INPUT_SKB_CB(skb)->frag_max_size;
if (br_parse_ip_options(skb)) if (br_parse_ip_options(skb))
return NF_DROP; return NF_DROP;
IPCB(skb)->frag_max_size = nf_bridge->frag_max_size;
IPCB(skb)->frag_max_size = frag_max;
} }
nf_bridge->physoutdev = skb->dev; 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) static int br_nf_dev_queue_xmit(struct sock *sk, struct sk_buff *skb)
{ {
int ret; int ret;
int frag_max_size; struct nf_bridge_info *nf_bridge;
unsigned int mtu_reserved; unsigned int mtu_reserved;
if (skb_is_gso(skb) || skb->protocol != htons(ETH_P_IP)) { 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); mtu_reserved = nf_bridge_mtu_reduction(skb);
nf_bridge = nf_bridge_info_get(skb);
/* This is wrong! We should preserve the original fragment /* This is wrong! We should preserve the original fragment
* boundaries by preserving frag_list rather than refragmenting. * boundaries by preserving frag_list rather than refragmenting.
*/ */
if (skb->len + mtu_reserved > skb->dev->mtu) { if (skb->len + mtu_reserved > skb->dev->mtu) {
struct brnf_frag_data *data; struct brnf_frag_data *data;
frag_max_size = BR_INPUT_SKB_CB(skb)->frag_max_size;
if (br_parse_ip_options(skb)) if (br_parse_ip_options(skb))
/* Drop invalid packet */ /* Drop invalid packet */
return NF_DROP; 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); nf_bridge_update_protocol(skb);

1
net/bridge/br_private.h
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@ -304,7 +304,6 @@ struct br_input_skb_cb {
int mrouters_only; int mrouters_only;
#endif #endif
u16 frag_max_size;
bool proxyarp_replied; bool proxyarp_replied;
#ifdef CONFIG_BRIDGE_VLAN_FILTERING #ifdef CONFIG_BRIDGE_VLAN_FILTERING