/*
* 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 EMFL common code when it wants
* to forward the packet on to a specific port. It adds the
* MAC header and queues the frame to the interface.
*
* Input: emfi - EMF instance information
* skb - Pointer to the packet buffer.
* mgrp_ip - Multicast destination address.
* txif - Interface to send the frame on.
*
* Return: SUCCESS or FAILURE.
*/
int32
emf_forward(emf_info_t *emfi, struct sk_buff *skb, uint32 mgrp_ip,
struct net_device *txif, bool rt_port)
{
struct ether_header *eh;
EMF_DEBUG("Forwarding the frame %p on to %s\n", skb, txif->name);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
ASSERT(txif->br_port);
/* Send only when the port is in forwarding state */
if (EMF_BRPORT_STATE(txif) != BR_STATE_FORWARDING)
{
EMF_INFO("Dropping the frame as the port %s is not in"
" FORWARDING state\n", txif->name);
kfree_skb(skb);
return (FAILURE);
}
/* there is no access to the "bridge" struct from netif in 2.6.36 */
#endif
eh = (struct ether_header *)skb_push(skb, ETH_HLEN);
/* No need to fill the ether header fields for packets received
* from LAN ports.
*/
if (rt_port)
{
eh->ether_type = __constant_htons(ETH_P_IP);
ETHER_FILL_MCAST_ADDR_FROM_IP(eh->ether_dhost, mgrp_ip);
memcpy(eh->ether_shost, skb->dev->dev_addr, skb->dev->addr_len);
}
EMF_INFO("Group Addr: %02x:%02x:%02x:%02x:%02x:%02x\n",
eh->ether_dhost[0], eh->ether_dhost[1], eh->ether_dhost[2],
eh->ether_dhost[3], eh->ether_dhost[4], eh->ether_dhost[5]);
/* Send buffer as if it is delivered by bridge */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 22)
skb_reset_mac_header(skb);
#else
skb->mac.raw = skb->data;
#endif
skb->dev = txif;
dev_queue_xmit(skb);
return (SUCCESS);
}
/*
* 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));
}
/*
* Description: This function is called when the user application enables
* EMF on a bridge interface. It primarily allocates memory
* for instance data and calls the common code init function.
*
* Input: emf - EMF module global data pointer
* inst_id - EMF instance name
* br_ptr - Bridge device pointer
*/
static emf_info_t *
emf_instance_add(emf_struct_t *emf, int8 *inst_id, struct net_device *br_ptr)
{
emf_info_t *emfi;
osl_t *osh;
#ifdef CONFIG_PROC_FS
uint8 proc_name[64];
#endif /* CONFIG_PROC_FS */
emfc_wrapper_t emfl;
if (emf->inst_count > EMF_MAX_INST)
{
EMF_ERROR("Max instance limit %d exceeded\n", EMF_MAX_INST);
return (NULL);
}
emf->inst_count++;
EMF_INFO("Creating EMF instance for %s\n", inst_id);
osh = osl_attach(NULL, PCI_BUS, FALSE);
ASSERT(osh);
/* Allocate os specfic EMF info object */
emfi = MALLOC(osh, sizeof(emf_info_t));
if (emfi == NULL)
{
EMF_ERROR("Out of memory allocating emf_info\n");
osl_detach(osh);
return (NULL);
}
emfi->osh = osh;
/* Save the EMF instance identifier */
strncpy(emfi->inst_id, inst_id, IFNAMSIZ);
emfi->inst_id[IFNAMSIZ - 1] = 0;
/* Save the device pointer */
emfi->br_dev = br_ptr;
/* Fill the linux wrapper specific functions */
emfl.forward_fn = (forward_fn_ptr)emf_forward;
emfl.sendup_fn = (sendup_fn_ptr)emf_sendup;
emfl.hooks_register_fn = (hooks_register_fn_ptr)emf_hooks_register;
emfl.hooks_unregister_fn = (hooks_unregister_fn_ptr)emf_hooks_unregister;
/* Initialize EMFC instance */
if ((emfi->emfci = emfc_init(inst_id, (void *)emfi, osh, &emfl)) == NULL)
{
EMF_ERROR("EMFC init failed\n");
MFREE(osh, emfi, sizeof(emf_info_t));
osl_detach(osh);
return (NULL);
}
EMF_INFO("Created EMFC instance for %s\n", inst_id);
/* Initialize the iflist head */
emfi->iflist_head = NULL;
#ifdef CONFIG_PROC_FS
sprintf(proc_name, "net/emf_stats_%s", inst_id);
create_proc_read_entry(proc_name, 0, 0, emf_stats_get, emfi);
sprintf(proc_name, "net/emfdb_%s", inst_id);
create_proc_read_entry(proc_name, 0, 0, emf_mfdb_list, emfi);
#endif /* CONFIG_PROC_FS */
/* Add to the global EMF instance list */
emfi->next = emf->list_head;
emf->list_head = emfi;
return (emfi);
}