/*
* Description: This function is called by Netfilter when packet hits
* the bridge pre routing hook. All IP packets are given
* to EMFL for its processing.
*
* Input: skb - Pointer to the packet buffer. Other parameters
* are not used.
*
* Return: Returns the value indicating packet can be forwarded
* or packet is stolen.
*/
static uint32
emf_br_pre_hook(uint32 hook, struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int32 (*okfn)(struct sk_buff *))
{
emf_info_t *emfi;
EMF_INFO("Frame at BR_PRE_HOOK received from if %p %s\n",
skb->dev, skb->dev->name);
/* Find the bridge that the receive interface corresponds to */
emfi = emf_instance_find_by_ifptr(emf, skb->dev);
if (emfi == NULL)
{
EMF_INFO("No EMF processing needed for unknown ports\n");
return (NF_ACCEPT);
}
/* Non IP packet received from LAN port is returned back to
* bridge.
*/
if (skb->protocol != __constant_htons(ETH_P_IP))
{
EMF_INFO("Ignoring non IP packets from LAN ports\n");
return (NF_ACCEPT);
}
EMF_DUMP_PKT(skb->data);
return (emfc_input(emfi->emfci, skb, skb->dev,
PKTDATA(NULL, skb), FALSE));
}
/*
* Description: This function is called by Netfilter when packet hits
* the ip post routing hook. The packet is sent to EMFL
* only when it is going on to bridge port.
*
* Input: skb - Pointer to the packet buffer. Other parameters
* are not used.
*
* Return: Returns the value indicating packet can be forwarded
* or packet is stolen.
*/
static uint32
emf_ip_post_hook(uint32 hook, struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int32 (*okfn)(struct sk_buff *))
{
emf_info_t *emfi;
ASSERT(skb->protocol == __constant_htons(ETH_P_IP));
EMF_DEBUG("Frame at IP_POST_HOOK going to if %p %s\n",
skb->dev, skb->dev->name);
/* Find the LAN that the bridge interface corresponds to */
emfi = emf_instance_find_by_brptr(emf, skb->dev);
if (emfi == NULL)
{
EMF_INFO("No EMF processing needed for unknown ports\n");
return (NF_ACCEPT);
}
EMF_DUMP_PKT(skb->data);
return (emfc_input(emfi->emfci, skb, skb->dev,
PKTDATA(NULL, skb), TRUE));
}
/*
* Description: This function is called by Netfilter when packet hits
* the ip post routing hook. The packet is sent to EMFL
* only when it is going on to bridge port.
*
* Input: pskb - Pointer to the packet buffer. Other parameters
* are not used.
*
* Return: Returns the value indicating packet can be forwarded
* or packet is stolen.
*/
static uint32
emf_ip_post_hook(
uint32 hook,
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36)
struct sk_buff *skb,
#else
struct sk_buff **pskb,
#endif
const struct net_device *in,
const struct net_device *out,
int32 (*okfn)(struct sk_buff *))
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36)
struct sk_buff **pskb = &skb;
#endif
emf_info_t *emfi;
ASSERT((*pskb)->protocol == __constant_htons(ETH_P_IP));
EMF_DEBUG("Frame at IP_POST_HOOK going to if %p %s\n",
(*pskb)->dev, (*pskb)->dev->name);
/* Find the LAN that the bridge interface corresponds to */
emfi = emf_instance_find_by_brptr(emf, (*pskb)->dev);
if (emfi == NULL)
{
EMF_INFO("No EMF processing needed for unknown ports\n");
return (NF_ACCEPT);
}
EMF_DUMP_PKT((*pskb)->data);
return (emfc_input(emfi->emfci, *pskb, (*pskb)->dev,
PKTDATA(NULL, *pskb), TRUE));
}