#include "core.h"
#include "bearer.h"
-#define MAX_ETH_MEDIA MAX_BEARERS
-
#define ETH_ADDR_OFFSET 4 /* message header offset of MAC address */
-/**
- * struct eth_media - Ethernet bearer data structure
- * @bearer: ptr to associated "generic" bearer structure
- * @dev: ptr to associated Ethernet network device
- * @tipc_packet_type: used in binding TIPC to Ethernet driver
- * @setup: work item used when enabling bearer
- * @cleanup: work item used when disabling bearer
- */
-struct eth_media {
- struct tipc_bearer *bearer;
- struct net_device *dev;
- struct packet_type tipc_packet_type;
- struct work_struct setup;
- struct work_struct cleanup;
-};
-
-
-static struct eth_media eth_media_array[MAX_ETH_MEDIA];
-static int eth_started;
-
-static int recv_notification(struct notifier_block *nb, unsigned long evt,
- void *dv);
-static int recv_msg(struct sk_buff *buf, struct net_device *dev,
- struct packet_type *pt, struct net_device *orig_dev);
-
-/*
- * Network device notifier info
- */
-static struct notifier_block notifier = {
- .notifier_call = recv_notification,
- .priority = 0
-};
-
-static struct packet_type tipc_packet_type __read_mostly = {
- .type = __constant_htons(ETH_P_TIPC),
- .func = recv_msg,
-};
-
/**
* eth_media_addr_set - initialize Ethernet media address structure
*
struct tipc_media_addr *dest)
{
struct sk_buff *clone;
- struct net_device *dev;
int delta;
+ struct net_device *dev = tb_ptr->dev;
clone = skb_clone(buf, GFP_ATOMIC);
if (!clone)
return 0;
- dev = ((struct eth_media *)(tb_ptr->usr_handle))->dev;
delta = dev->hard_header_len - skb_headroom(buf);
-
if ((delta > 0) &&
pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
kfree_skb(clone);
return 0;
}
-/**
- * recv_msg - handle incoming TIPC message from an Ethernet interface
- *
- * Accept only packets explicitly sent to this node, or broadcast packets;
- * ignores packets sent using Ethernet multicast, and traffic sent to other
- * nodes (which can happen if interface is running in promiscuous mode).
- */
-static int recv_msg(struct sk_buff *buf, struct net_device *dev,
- struct packet_type *pt, struct net_device *orig_dev)
-{
- struct tipc_bearer *b_ptr;
-
- if (!net_eq(dev_net(dev), &init_net)) {
- kfree_skb(buf);
- return NET_RX_DROP;
- }
-
- rcu_read_lock();
- b_ptr = rcu_dereference(dev->tipc_ptr);
- if (likely(b_ptr)) {
- if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
- buf->next = NULL;
- tipc_recv_msg(buf, b_ptr);
- rcu_read_unlock();
- return NET_RX_SUCCESS;
- }
- }
- rcu_read_unlock();
-
- kfree_skb(buf);
- return NET_RX_DROP;
-}
-
-/**
- * setup_media - setup association between Ethernet bearer and interface
- */
-static void setup_media(struct work_struct *work)
-{
- dev_add_pack(&tipc_packet_type);
-}
-
/**
* enable_media - attach TIPC bearer to an Ethernet interface
*/
static int enable_media(struct tipc_bearer *tb_ptr)
{
struct net_device *dev;
- struct eth_media *eb_ptr = ð_media_array[0];
- struct eth_media *stop = ð_media_array[MAX_ETH_MEDIA];
char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1;
- int pending_dev = 0;
-
- /* Find unused Ethernet bearer structure */
- while (eb_ptr->dev) {
- if (!eb_ptr->bearer)
- pending_dev++;
- if (++eb_ptr == stop)
- return pending_dev ? -EAGAIN : -EDQUOT;
- }
/* Find device with specified name */
dev = dev_get_by_name(&init_net, driver_name);
if (!dev)
return -ENODEV;
- /* Create Ethernet bearer for device */
- eb_ptr->dev = dev;
- INIT_WORK(&eb_ptr->setup, setup_media);
- schedule_work(&eb_ptr->setup);
-
/* Associate TIPC bearer with Ethernet bearer */
tb_ptr->dev = dev;
- eb_ptr->bearer = tb_ptr;
- tb_ptr->usr_handle = (void *)eb_ptr;
+ tb_ptr->usr_handle = NULL;
memset(tb_ptr->bcast_addr.value, 0, sizeof(tb_ptr->bcast_addr.value));
memcpy(tb_ptr->bcast_addr.value, dev->broadcast, ETH_ALEN);
tb_ptr->bcast_addr.media_id = TIPC_MEDIA_TYPE_ETH;
return 0;
}
-/**
- * cleanup_media - break association between Ethernet bearer and interface
- *
- * This routine must be invoked from a work queue because it can sleep.
- */
-static void cleanup_media(struct work_struct *work)
-{
- struct eth_media *eb_ptr =
- container_of(work, struct eth_media, cleanup);
-
- dev_remove_pack(&tipc_packet_type);
- dev_put(eb_ptr->dev);
- eb_ptr->dev = NULL;
-}
-
/**
* disable_media - detach TIPC bearer from an Ethernet interface
*
*/
static void disable_media(struct tipc_bearer *tb_ptr)
{
- struct eth_media *eb_ptr = (struct eth_media *)tb_ptr->usr_handle;
-
- eb_ptr->bearer = NULL;
- INIT_WORK(&eb_ptr->cleanup, cleanup_media);
- schedule_work(&eb_ptr->cleanup);
RCU_INIT_POINTER(tb_ptr->dev->tipc_ptr, NULL);
-}
-
-/**
- * recv_notification - handle device updates from OS
- *
- * Change the state of the Ethernet bearer (if any) associated with the
- * specified device.
- */
-static int recv_notification(struct notifier_block *nb, unsigned long evt,
- void *ptr)
-{
- struct tipc_bearer *b_ptr;
- struct net_device *dev = netdev_notifier_info_to_dev(ptr);
-
- if (!net_eq(dev_net(dev), &init_net))
- return NOTIFY_DONE;
-
- rcu_read_lock();
- b_ptr = rcu_dereference(dev->tipc_ptr);
- if (!b_ptr) {
- rcu_read_unlock();
- return NOTIFY_DONE; /* bearer had been disabled */
- }
-
- b_ptr->mtu = dev->mtu;
-
- switch (evt) {
- case NETDEV_CHANGE:
- if (netif_carrier_ok(dev))
- break;
- case NETDEV_DOWN:
- case NETDEV_CHANGEMTU:
- case NETDEV_CHANGEADDR:
- tipc_reset_bearer(b_ptr);
- break;
- case NETDEV_UNREGISTER:
- case NETDEV_CHANGENAME:
- tipc_disable_bearer(b_ptr->name);
- break;
- }
- rcu_read_unlock();
-
- return NOTIFY_OK;
+ dev_put(tb_ptr->dev);
}
/**
.name = "eth"
};
-/**
- * tipc_eth_media_start - activate Ethernet bearer support
- *
- * Register Ethernet media type with TIPC bearer code. Also register
- * with OS for notifications about device state changes.
- */
-int tipc_eth_media_start(void)
-{
- int res;
-
- if (eth_started)
- return -EINVAL;
-
- res = register_netdevice_notifier(¬ifier);
- if (!res)
- eth_started = 1;
- return res;
-}
-
-/**
- * tipc_eth_media_stop - deactivate Ethernet bearer support
- */
-void tipc_eth_media_stop(void)
-{
- if (!eth_started)
- return;
-
- flush_scheduled_work();
- unregister_netdevice_notifier(¬ifier);
- eth_started = 0;
-}
projects / cascardo / linux.git / blobdiff