Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 643 insertions, 0 deletions

diff --git a/drivers/net/hamradio/bpqether.c b/drivers/net/hamradio/bpqether.c
new file mode 100644
index 000000000000..ef1a359e2273
--- /dev/null
+++ b/drivers/net/hamradio/bpqether.c
@@ -0,0 +1,643 @@
+/*
+ *      G8BPQ compatible "AX.25 via ethernet" driver release 004
+ *
+ *      This code REQUIRES 2.0.0 or higher/ NET3.029
+ *
+ *      This module:
+ *              This module is free software; you can redistribute it and/or
+ *              modify it under the terms of the GNU General Public License
+ *              as published by the Free Software Foundation; either version
+ *              2 of the License, or (at your option) any later version.
+ *
+ *      This is a "pseudo" network driver to allow AX.25 over Ethernet
+ *      using G8BPQ encapsulation. It has been extracted from the protocol
+ *      implementation because
+ *
+ *              - things got unreadable within the protocol stack
+ *              - to cure the protocol stack from "feature-ism"
+ *              - a protocol implementation shouldn't need to know on
+ *                which hardware it is running
+ *              - user-level programs like the AX.25 utilities shouldn't
+ *                need to know about the hardware.
+ *              - IP over ethernet encapsulated AX.25 was impossible
+ *              - rxecho.c did not work
+ *              - to have room for extensions
+ *              - it just deserves to "live" as an own driver
+ *
+ *      This driver can use any ethernet destination address, and can be
+ *      limited to accept frames from one dedicated ethernet card only.
+ *
+ *      Note that the driver sets up the BPQ devices automagically on
+ *      startup or (if started before the "insmod" of an ethernet device)
+ *      on "ifconfig up". It hopefully will remove the BPQ on "rmmod"ing
+ *      the ethernet device (in fact: as soon as another ethernet or bpq
+ *      device gets "ifconfig"ured).
+ *
+ *      I have heard that several people are thinking of experiments
+ *      with highspeed packet radio using existing ethernet cards.
+ *      Well, this driver is prepared for this purpose, just add
+ *      your tx key control and a txdelay / tailtime algorithm,
+ *      probably some buffering, and /voila/...
+ *
+ *      History
+ *      BPQ   001       Joerg(DL1BKE)           Extracted BPQ code from AX.25
+ *                                              protocol stack and added my own
+ *                                              yet existing patches
+ *      BPQ   002       Joerg(DL1BKE)           Scan network device list on
+ *                                              startup.
+ *      BPQ   003       Joerg(DL1BKE)           Ethernet destination address
+ *                                              and accepted source address
+ *                                              can be configured by an ioctl()
+ *                                              call.
+ *                                              Fixed to match Linux networking
+ *                                              changes - 2.1.15.
+ *      BPQ   004       Joerg(DL1BKE)           Fixed to not lock up on ifconfig.
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/net.h>
+#include <net/ax25.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/if_ether.h>
+#include <linux/if_arp.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/notifier.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/stat.h>
+#include <linux/netfilter.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/rtnetlink.h>
+
+#include <net/ip.h>
+#include <net/arp.h>
+
+#include <linux/bpqether.h>
+
+static char banner[] __initdata = KERN_INFO "AX.25: bpqether driver version 004\n";
+
+static unsigned char ax25_bcast[AX25_ADDR_LEN] =
+        {'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1};
+static unsigned char ax25_defaddr[AX25_ADDR_LEN] =
+        {'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1};
+
+static char bcast_addr[6]={0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};
+
+static char bpq_eth_addr[6];
+
+static int bpq_rcv(struct sk_buff *, struct net_device *, struct packet_type *);
+static int bpq_device_event(struct notifier_block *, unsigned long, void *);
+static const char *bpq_print_ethaddr(const unsigned char *);
+
+static struct packet_type bpq_packet_type = {
+        .type   = __constant_htons(ETH_P_BPQ),
+        .func   = bpq_rcv,
+};
+
+static struct notifier_block bpq_dev_notifier = {
+        .notifier_call =bpq_device_event,
+};
+
+
+struct bpqdev {
+        struct list_head bpq_list;      /* list of bpq devices chain */
+        struct net_device *ethdev;      /* link to ethernet device */
+        struct net_device *axdev;       /* bpq device (bpq#) */
+        struct net_device_stats stats;  /* some statistics */
+        char   dest_addr[6];            /* ether destination address */
+        char   acpt_addr[6];            /* accept ether frames from this address only */
+};
+
+static LIST_HEAD(bpq_devices);
+
+
+/* ------------------------------------------------------------------------ */
+
+
+/*
+ *      Get the ethernet device for a BPQ device
+ */
+static inline struct net_device *bpq_get_ether_dev(struct net_device *dev)
+{
+        struct bpqdev *bpq = netdev_priv(dev);
+
+        return bpq ? bpq->ethdev : NULL;
+}
+
+/*
+ *      Get the BPQ device for the ethernet device
+ */
+static inline struct net_device *bpq_get_ax25_dev(struct net_device *dev)
+{
+        struct bpqdev *bpq;
+
+        list_for_each_entry(bpq, &bpq_devices, bpq_list) {
+                if (bpq->ethdev == dev)
+                        return bpq->axdev;
+        }
+        return NULL;
+}
+
+static inline int dev_is_ethdev(struct net_device *dev)
+{
+        return (
+                        dev->type == ARPHRD_ETHER
+                        && strncmp(dev->name, "dummy", 5)
+        );
+}
+
+/* ------------------------------------------------------------------------ */
+
+
+/*
+ *      Receive an AX.25 frame via an ethernet interface.
+ */
+static int bpq_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *ptype)
+{
+        int len;
+        char * ptr;
+        struct ethhdr *eth;
+        struct bpqdev *bpq;
+
+        if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
+                return NET_RX_DROP;
+
+        if (!pskb_may_pull(skb, sizeof(struct ethhdr)))
+                goto drop;
+
+        rcu_read_lock();
+        dev = bpq_get_ax25_dev(dev);
+
+        if (dev == NULL || !netif_running(dev)) 
+                goto drop_unlock;
+
+        /*
+         * if we want to accept frames from just one ethernet device
+         * we check the source address of the sender.
+         */
+
+        bpq = netdev_priv(dev);
+
+        eth = eth_hdr(skb);
+
+        if (!(bpq->acpt_addr[0] & 0x01) &&
+            memcmp(eth->h_source, bpq->acpt_addr, ETH_ALEN))
+                goto drop_unlock;
+
+        if (skb_cow(skb, sizeof(struct ethhdr)))
+                goto drop_unlock;
+
+        len = skb->data[0] + skb->data[1] * 256 - 5;
+
+        skb_pull(skb, 2);       /* Remove the length bytes */
+        skb_trim(skb, len);     /* Set the length of the data */
+
+        bpq->stats.rx_packets++;
+        bpq->stats.rx_bytes += len;
+
+        ptr = skb_push(skb, 1);
+        *ptr = 0;
+
+        skb->dev = dev;
+        skb->protocol = htons(ETH_P_AX25);
+        skb->mac.raw = skb->data;
+        skb->pkt_type = PACKET_HOST;
+
+        netif_rx(skb);
+        dev->last_rx = jiffies;
+unlock:
+
+        rcu_read_unlock();
+
+        return 0;
+drop_unlock:
+        kfree_skb(skb);
+        goto unlock;
+
+drop:
+        kfree_skb(skb);
+        return 0;
+}
+
+/*
+ *      Send an AX.25 frame via an ethernet interface
+ */
+static int bpq_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+        struct sk_buff *newskb;
+        unsigned char *ptr;
+        struct bpqdev *bpq;
+        int size;
+
+        /*
+         * Just to be *really* sure not to send anything if the interface
+         * is down, the ethernet device may have gone.
+         */
+        if (!netif_running(dev)) {
+                kfree_skb(skb);
+                return -ENODEV;
+        }
+
+        skb_pull(skb, 1);
+        size = skb->len;
+
+        /*
+         * The AX.25 code leaves enough room for the ethernet header, but
+         * sendto() does not.
+         */
+        if (skb_headroom(skb) < AX25_BPQ_HEADER_LEN) {  /* Ough! */
+                if ((newskb = skb_realloc_headroom(skb, AX25_BPQ_HEADER_LEN)) == NULL) {
+                        printk(KERN_WARNING "bpqether: out of memory\n");
+                        kfree_skb(skb);
+                        return -ENOMEM;
+                }
+
+                if (skb->sk != NULL)
+                        skb_set_owner_w(newskb, skb->sk);
+
+                kfree_skb(skb);
+                skb = newskb;
+        }
+
+        skb->protocol = htons(ETH_P_AX25);
+
+        ptr = skb_push(skb, 2);
+
+        *ptr++ = (size + 5) % 256;
+        *ptr++ = (size + 5) / 256;
+
+        bpq = netdev_priv(dev);
+
+        if ((dev = bpq_get_ether_dev(dev)) == NULL) {
+                bpq->stats.tx_dropped++;
+                kfree_skb(skb);
+                return -ENODEV;
+        }
+
+        skb->dev = dev;
+        skb->nh.raw = skb->data;
+        dev->hard_header(skb, dev, ETH_P_BPQ, bpq->dest_addr, NULL, 0);
+        bpq->stats.tx_packets++;
+        bpq->stats.tx_bytes+=skb->len;
+  
+        dev_queue_xmit(skb);
+        netif_wake_queue(dev);
+        return 0;
+}
+
+/*
+ *      Statistics
+ */
+static struct net_device_stats *bpq_get_stats(struct net_device *dev)
+{
+        struct bpqdev *bpq = netdev_priv(dev);
+
+        return &bpq->stats;
+}
+
+/*
+ *      Set AX.25 callsign
+ */
+static int bpq_set_mac_address(struct net_device *dev, void *addr)
+{
+    struct sockaddr *sa = (struct sockaddr *)addr;
+
+    memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
+
+    return 0;
+}
+
+/*      Ioctl commands
+ *
+ *              SIOCSBPQETHOPT          reserved for enhancements
+ *              SIOCSBPQETHADDR         set the destination and accepted
+ *                                      source ethernet address (broadcast
+ *                                      or multicast: accept all)
+ */
+static int bpq_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+        struct bpq_ethaddr __user *ethaddr = ifr->ifr_data;
+        struct bpqdev *bpq = netdev_priv(dev);
+        struct bpq_req req;
+
+        if (!capable(CAP_NET_ADMIN))
+                return -EPERM;
+
+        switch (cmd) {
+                case SIOCSBPQETHOPT:
+                        if (copy_from_user(&req, ifr->ifr_data, sizeof(struct bpq_req)))
+                                return -EFAULT;
+                        switch (req.cmd) {
+                                case SIOCGBPQETHPARAM:
+                                case SIOCSBPQETHPARAM:
+                                default:
+                                        return -EINVAL;
+                        }
+
+                        break;
+
+                case SIOCSBPQETHADDR:
+                        if (copy_from_user(bpq->dest_addr, ethaddr->destination, ETH_ALEN))
+                                return -EFAULT;
+                        if (copy_from_user(bpq->acpt_addr, ethaddr->accept, ETH_ALEN))
+                                return -EFAULT;
+                        break;
+
+                default:
+                        return -EINVAL;
+        }
+
+        return 0;
+}
+
+/*
+ * open/close a device
+ */
+static int bpq_open(struct net_device *dev)
+{
+        netif_start_queue(dev);
+        return 0;
+}
+
+static int bpq_close(struct net_device *dev)
+{
+        netif_stop_queue(dev);
+        return 0;
+}
+
+
+/* ------------------------------------------------------------------------ */
+
+
+/*
+ *      Proc filesystem
+ */
+static const char * bpq_print_ethaddr(const unsigned char *e)
+{
+        static char buf[18];
+
+        sprintf(buf, "%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X",
+                e[0], e[1], e[2], e[3], e[4], e[5]);
+
+        return buf;
+}
+
+static void *bpq_seq_start(struct seq_file *seq, loff_t *pos)
+{
+        int i = 1;
+        struct bpqdev *bpqdev;
+
+        rcu_read_lock();
+
+        if (*pos == 0)
+                return SEQ_START_TOKEN;
+        
+        list_for_each_entry(bpqdev, &bpq_devices, bpq_list) {
+                if (i == *pos)
+                        return bpqdev;
+        }
+        return NULL;
+}
+
+static void *bpq_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+        struct list_head *p;
+
+        ++*pos;
+
+        if (v == SEQ_START_TOKEN)
+                p = bpq_devices.next;
+        else
+                p = ((struct bpqdev *)v)->bpq_list.next;
+
+        return (p == &bpq_devices) ? NULL 
+                : list_entry(p, struct bpqdev, bpq_list);
+}
+
+static void bpq_seq_stop(struct seq_file *seq, void *v)
+{
+        rcu_read_unlock();
+}
+
+
+static int bpq_seq_show(struct seq_file *seq, void *v)
+{
+        if (v == SEQ_START_TOKEN)
+                seq_puts(seq, 
+                         "dev   ether      destination        accept from\n");
+        else {
+                const struct bpqdev *bpqdev = v;
+
+                seq_printf(seq, "%-5s %-10s %s  ",
+                        bpqdev->axdev->name, bpqdev->ethdev->name,
+                        bpq_print_ethaddr(bpqdev->dest_addr));
+
+                seq_printf(seq, "%s\n",
+                        (bpqdev->acpt_addr[0] & 0x01) ? "*" 
+                           : bpq_print_ethaddr(bpqdev->acpt_addr));
+
+        }
+        return 0;
+}
+
+static struct seq_operations bpq_seqops = {
+        .start = bpq_seq_start,
+        .next = bpq_seq_next,
+        .stop = bpq_seq_stop,
+        .show = bpq_seq_show,
+};
+
+static int bpq_info_open(struct inode *inode, struct file *file)
+{
+        return seq_open(file, &bpq_seqops);
+}
+
+static struct file_operations bpq_info_fops = {
+        .owner = THIS_MODULE,
+        .open = bpq_info_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = seq_release,
+};
+
+
+/* ------------------------------------------------------------------------ */
+
+
+static void bpq_setup(struct net_device *dev)
+{
+
+        dev->hard_start_xmit = bpq_xmit;
+        dev->open            = bpq_open;
+        dev->stop            = bpq_close;
+        dev->set_mac_address = bpq_set_mac_address;
+        dev->get_stats       = bpq_get_stats;
+        dev->do_ioctl        = bpq_ioctl;
+        dev->destructor      = free_netdev;
+
+        memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
+        memcpy(dev->dev_addr,  ax25_defaddr, AX25_ADDR_LEN);
+
+        dev->flags      = 0;
+
+#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
+        dev->hard_header     = ax25_encapsulate;
+        dev->rebuild_header  = ax25_rebuild_header;
+#endif
+
+        dev->type            = ARPHRD_AX25;
+        dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
+        dev->mtu             = AX25_DEF_PACLEN;
+        dev->addr_len        = AX25_ADDR_LEN;
+
+}
+
+/*
+ *      Setup a new device.
+ */
+static int bpq_new_device(struct net_device *edev)
+{
+        int err;
+        struct net_device *ndev;
+        struct bpqdev *bpq;
+
+        ndev = alloc_netdev(sizeof(struct bpqdev), "bpq%d",
+                           bpq_setup);
+        if (!ndev)
+                return -ENOMEM;
+
+                
+        bpq = netdev_priv(ndev);
+        dev_hold(edev);
+        bpq->ethdev = edev;
+        bpq->axdev = ndev;
+
+        memcpy(bpq->dest_addr, bcast_addr, sizeof(bpq_eth_addr));
+        memcpy(bpq->acpt_addr, bcast_addr, sizeof(bpq_eth_addr));
+
+        err = dev_alloc_name(ndev, ndev->name);
+        if (err < 0) 
+                goto error;
+
+        err = register_netdevice(ndev);
+        if (err)
+                goto error;
+
+        /* List protected by RTNL */
+        list_add_rcu(&bpq->bpq_list, &bpq_devices);
+        return 0;
+
+ error:
+        dev_put(edev);
+        free_netdev(ndev);
+        return err;
+        
+}
+
+static void bpq_free_device(struct net_device *ndev)
+{
+        struct bpqdev *bpq = netdev_priv(ndev);
+
+        dev_put(bpq->ethdev);
+        list_del_rcu(&bpq->bpq_list);
+
+        unregister_netdevice(ndev);
+}
+
+/*
+ *      Handle device status changes.
+ */
+static int bpq_device_event(struct notifier_block *this,unsigned long event, void *ptr)
+{
+        struct net_device *dev = (struct net_device *)ptr;
+
+        if (!dev_is_ethdev(dev))
+                return NOTIFY_DONE;
+
+        rcu_read_lock();
+
+        switch (event) {
+        case NETDEV_UP:         /* new ethernet device -> new BPQ interface */
+                if (bpq_get_ax25_dev(dev) == NULL)
+                        bpq_new_device(dev);
+                break;
+
+        case NETDEV_DOWN:       /* ethernet device closed -> close BPQ interface */
+                if ((dev = bpq_get_ax25_dev(dev)) != NULL)
+                        dev_close(dev);
+                break;
+
+        case NETDEV_UNREGISTER: /* ethernet device removed -> free BPQ interface */
+                if ((dev = bpq_get_ax25_dev(dev)) != NULL)
+                        bpq_free_device(dev);
+                break;
+        default:
+                break;
+        }
+        rcu_read_unlock();
+
+        return NOTIFY_DONE;
+}
+
+
+/* ------------------------------------------------------------------------ */
+
+/*
+ * Initialize driver. To be called from af_ax25 if not compiled as a
+ * module
+ */
+static int __init bpq_init_driver(void)
+{
+#ifdef CONFIG_PROC_FS
+        if (!proc_net_fops_create("bpqether", S_IRUGO, &bpq_info_fops)) {
+                printk(KERN_ERR
+                        "bpq: cannot create /proc/net/bpqether entry.\n");
+                return -ENOENT;
+        }
+#endif  /* CONFIG_PROC_FS */
+
+        dev_add_pack(&bpq_packet_type);
+
+        register_netdevice_notifier(&bpq_dev_notifier);
+
+        printk(banner);
+
+        return 0;
+}
+
+static void __exit bpq_cleanup_driver(void)
+{
+        struct bpqdev *bpq;
+
+        dev_remove_pack(&bpq_packet_type);
+
+        unregister_netdevice_notifier(&bpq_dev_notifier);
+
+        proc_net_remove("bpqether");
+
+        rtnl_lock();
+        while (!list_empty(&bpq_devices)) {
+                bpq = list_entry(bpq_devices.next, struct bpqdev, bpq_list);
+                bpq_free_device(bpq->axdev);
+        }
+        rtnl_unlock();
+}
+
+MODULE_AUTHOR("Joerg Reuter DL1BKE <jreuter@yaina.de>");
+MODULE_DESCRIPTION("Transmit and receive AX.25 packets over Ethernet");
+MODULE_LICENSE("GPL");
+module_init(bpq_init_driver);
+module_exit(bpq_cleanup_driver);