Commit 411ffb4f authored by Bernhard Thaler's avatar Bernhard Thaler Committed by Pablo Neira Ayuso

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: default avatarBernhard Thaler <bernhard.thaler@wvnet.at>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 72b31f72
......@@ -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 {
......
......@@ -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);
......
......@@ -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
......
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