diff options
Diffstat (limited to 'pfinet/loopback.c')
| -rw-r--r-- | pfinet/loopback.c | 166 |
1 files changed, 100 insertions, 66 deletions
diff --git a/pfinet/loopback.c b/pfinet/loopback.c index 0d3681fb..068cf3c8 100644 --- a/pfinet/loopback.c +++ b/pfinet/loopback.c @@ -1,6 +1,5 @@ /* Loopback "device" for pfinet - Copyright (C) 1996, 1998 Free Software Foundation, Inc. - Written by Thomas Bushnell, n/BSG. + Copyright (C) 1996,98,2000 Free Software Foundation, Inc. This file is part of the GNU Hurd. @@ -18,79 +17,114 @@ along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */ -#include <linux/netdevice.h> +#include "pfinet.h" #include <netinet/in.h> #include <arpa/inet.h> -#include "pfinet.h" - -struct device loopback_dev; - -int -loopback_xmit (struct sk_buff *skb, struct device *dev) +#include <linux/socket.h> +#include <linux/net.h> +#include <linux/inet.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#include <net/sock.h> +#include <linux/if_ether.h> /* For the statistics structure. */ +#include <linux/if_arp.h> /* For ARPHRD_ETHER */ + +#define LOOPBACK_MTU (vm_page_size - 172) + +/* + * The higher levels take care of making this non-reentrant (it's + * called with bh's disabled). + */ +static int loopback_xmit(struct sk_buff *skb, struct device *dev) { - int done; - - if (!skb || !dev) - return 0; - - if (dev->tbusy) - return 1; - - dev->tbusy; - - done = dev_rint (skb->data, skb->len, 0, dev); - dev_kfree_skb (skb, FREE_WRITE); - - while (done != 1) - done = dev_rint (0, 0, 0, dev); - - dev->tbusy = 0; - return 0; + struct net_device_stats *stats = (struct net_device_stats *)dev->priv; + + /* + * Take this out if the debug says its ok + */ + + if (skb == NULL || dev == NULL) + printk(KERN_DEBUG "loopback fed NULL data - splat\n"); + + /* + * Optimise so buffers with skb->free=1 are not copied but + * instead are lobbed from tx queue to rx queue + */ + + if(atomic_read(&skb->users) != 1) + { + struct sk_buff *skb2=skb; + skb=skb_clone(skb, GFP_ATOMIC); /* Clone the buffer */ + if(skb==NULL) { + kfree_skb(skb2); + return 0; + } + kfree_skb(skb2); + } + else + skb_orphan(skb); + + skb->protocol=eth_type_trans(skb,dev); + skb->dev=dev; +#ifndef LOOPBACK_MUST_CHECKSUM + skb->ip_summed = CHECKSUM_UNNECESSARY; +#endif + netif_rx(skb); + + stats->rx_bytes+=skb->len; + stats->tx_bytes+=skb->len; + stats->rx_packets++; + stats->tx_packets++; + + return(0); } -u_int16_t -loopback_type_trans (struct sk_buff *skb, struct device *dev) +static struct net_device_stats *get_stats(struct device *dev) { - return htons (ETH_P_IP); + return (struct net_device_stats *)dev->priv; } +static int loopback_open(struct device *dev) +{ + dev->flags|=IFF_LOOPBACK; + return 0; +} -void -setup_loopback_device (char *name) +/* Initialize the rest of the LOOPBACK device. */ +static int loopback_init(struct device *dev) { - int i; - - loopback_dev.name = name; - for (i = 0; i < DEV_NUMBUFFS; i++) - skb_queue_head_init (&loopback_dev.buffs[i]); - - loopback_dev.open = 0; - loopback_dev.stop = 0; - loopback_dev.hard_start_xmit = loopback_xmit; - loopback_dev.hard_header = 0; - loopback_dev.rebuild_header = 0; - loopback_dev.type_trans = loopback_type_trans; - loopback_dev.get_stats = 0; - loopback_dev.set_multicast_list = 0; - - loopback_dev.type = 0; - loopback_dev.addr_len = 0; - loopback_dev.flags = IFF_LOOPBACK | IFF_BROADCAST | IFF_UP; - loopback_dev.family = AF_INET; - - loopback_dev.mtu = 2000; - - /* Defaults */ - loopback_dev.pa_addr = inet_addr ("127.0.0.1"); - loopback_dev.pa_brdaddr = inet_addr ("127.255.255.255"); - loopback_dev.pa_mask = inet_addr ("255.0.0.0"); - loopback_dev.pa_alen = sizeof (unsigned long); - - loopback_dev.next = dev_base; - dev_base = &loopback_dev; - - /* Add the route */ - ip_rt_add (RTF_HOST, loopback_dev.pa_addr, 0xffffffff, 0, &loopback_dev, - loopback_dev.mtu, 0); + dev->mtu = LOOPBACK_MTU; + dev->tbusy = 0; + dev->hard_start_xmit = loopback_xmit; + dev->hard_header = eth_header; + dev->hard_header_cache = eth_header_cache; + dev->header_cache_update= eth_header_cache_update; + dev->hard_header_len = ETH_HLEN; /* 14 */ + dev->addr_len = ETH_ALEN; /* 6 */ + dev->tx_queue_len = 0; + dev->type = ARPHRD_LOOPBACK; /* 0x0001 */ + dev->rebuild_header = eth_rebuild_header; + dev->open = loopback_open; + dev->flags = IFF_LOOPBACK; + dev->priv = kmalloc(sizeof(struct net_device_stats), GFP_KERNEL); + if (dev->priv == NULL) + return -ENOMEM; + memset(dev->priv, 0, sizeof(struct net_device_stats)); + dev->get_stats = get_stats; + + /* + * Fill in the generic fields of the device structure. + */ + + dev_init_buffers(dev); + + return(0); } + + +struct device loopback_dev = { name: "lo", init: &loopback_init, }; + +/* It is important magic that this is the first thing on the list. */ +struct device *dev_base = &loopback_dev; |