patch-2.0.35 linux/drivers/net/hdlcdrv.c
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- Lines: 1038
- Date:
Mon Jul 13 13:47:31 1998
- Orig file:
v2.0.34/linux/drivers/net/hdlcdrv.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.0.34/linux/drivers/net/hdlcdrv.c linux/drivers/net/hdlcdrv.c
@@ -0,0 +1,1037 @@
+/*****************************************************************************/
+
+/*
+ * hdlcdrv.c -- HDLC packet radio network driver.
+ *
+ * Copyright (C) 1996 Thomas Sailer (sailer@ife.ee.ethz.ch)
+ *
+ * This program 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 program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Please note that the GPL allows you to use the driver, NOT the radio.
+ * In order to use the radio, you need a license from the communications
+ * authority of your country.
+ *
+ * The driver was derived from Donald Beckers skeleton.c
+ * Written 1993-94 by Donald Becker.
+ *
+ * History:
+ * 0.1 21.09.96 Started
+ * 18.10.96 Changed to new user space access routines
+ * (copy_{to,from}_user)
+ * 0.2 21.11.96 various small changes
+ * 0.3 03.03.97 fixed (hopefully) IP not working with ax.25 as a module
+ * 0.4 16.04.97 init code/data tagged
+ */
+
+/*****************************************************************************/
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/net.h>
+#include <linux/in.h>
+#include <linux/if.h>
+#include <linux/malloc.h>
+#include <linux/errno.h>
+#include <asm/bitops.h>
+
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/hdlcdrv.h>
+#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
+/* prototypes for ax25_encapsulate and ax25_rebuild_header */
+#include <net/ax25.h>
+#endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
+
+/* make genksyms happy */
+#include <linux/ip.h>
+#include <linux/udp.h>
+#include <linux/tcp.h>
+#include <linux/net_alias.h>
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * currently this module is supposed to support both module styles, i.e.
+ * the old one present up to about 2.1.9, and the new one functioning
+ * starting with 2.1.21. The reason is I have a kit allowing to compile
+ * this module also under 2.0.x which was requested by several people.
+ * This will go in 2.2
+ */
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE >= 0x20100
+#include <asm/uaccess.h>
+#else
+#include <asm/segment.h>
+#include <linux/mm.h>
+
+#undef put_user
+#undef get_user
+
+#define put_user(x,ptr) ({ __put_user((unsigned long)(x),(ptr),sizeof(*(ptr))); 0; })
+#define get_user(x,ptr) ({ x = ((__typeof__(*(ptr)))__get_user((ptr),sizeof(*(ptr)))); 0; })
+
+extern inline int copy_from_user(void *to, const void *from, unsigned long n)
+{
+ int i = verify_area(VERIFY_READ, from, n);
+ if (i)
+ return i;
+ memcpy_fromfs(to, from, n);
+ return 0;
+}
+
+extern inline int copy_to_user(void *to, const void *from, unsigned long n)
+{
+ int i = verify_area(VERIFY_WRITE, to, n);
+ if (i)
+ return i;
+ memcpy_tofs(to, from, n);
+ return 0;
+}
+#endif
+
+/* --------------------------------------------------------------------- */
+
+#if LINUX_VERSION_CODE < 0x20115
+extern __inline__ void dev_init_buffers(struct device *dev)
+{
+ int i;
+ for(i=0;i<DEV_NUMBUFFS;i++)
+ {
+ skb_queue_head_init(&dev->buffs[i]);
+ }
+}
+#endif
+
+/* --------------------------------------------------------------------- */
+
+#if LINUX_VERSION_CODE >= 0x20123
+#include <linux/init.h>
+#else
+#define __init
+#define __initdata
+#define __initfunc(x) x
+#endif
+
+/* --------------------------------------------------------------------- */
+
+#if LINUX_VERSION_CODE < 0x20125
+#define test_and_set_bit set_bit
+#define test_and_clear_bit clear_bit
+#endif
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * The name of the card. Is used for messages and in the requests for
+ * io regions, irqs and dma channels
+ */
+
+static char ax25_bcast[7] =
+{'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1};
+static char ax25_test[7] =
+{'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1};
+
+/* --------------------------------------------------------------------- */
+
+#define KISS_VERBOSE
+
+/* --------------------------------------------------------------------- */
+
+#define PARAM_TXDELAY 1
+#define PARAM_PERSIST 2
+#define PARAM_SLOTTIME 3
+#define PARAM_TXTAIL 4
+#define PARAM_FULLDUP 5
+#define PARAM_HARDWARE 6
+#define PARAM_RETURN 255
+
+/* --------------------------------------------------------------------- */
+
+#define min(a, b) (((a) < (b)) ? (a) : (b))
+#define max(a, b) (((a) > (b)) ? (a) : (b))
+
+/* --------------------------------------------------------------------- */
+/*
+ * the CRC routines are stolen from WAMPES
+ * by Dieter Deyke
+ */
+
+static const unsigned short crc_ccitt_table[] = {
+ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
+ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
+ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
+ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
+ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
+ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
+ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
+ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
+ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
+ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
+ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
+ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
+ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
+ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
+ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
+ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
+ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
+ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
+ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
+ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
+ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
+ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
+ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
+ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
+ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
+ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
+ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
+ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
+ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
+ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
+ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
+ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
+};
+
+/*---------------------------------------------------------------------------*/
+
+static inline void append_crc_ccitt(unsigned char *buffer, int len)
+{
+ unsigned int crc = 0xffff;
+
+ for (;len>0;len--)
+ crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];
+ crc ^= 0xffff;
+ *buffer++ = crc;
+ *buffer++ = crc >> 8;
+}
+
+/*---------------------------------------------------------------------------*/
+
+static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
+{
+ unsigned int crc = 0xffff;
+
+ for (; cnt > 0; cnt--)
+ crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff];
+ return (crc & 0xffff) == 0xf0b8;
+}
+
+/*---------------------------------------------------------------------------*/
+
+#if 0
+static int calc_crc_ccitt(const unsigned char *buf, int cnt)
+{
+ unsigned int crc = 0xffff;
+
+ for (; cnt > 0; cnt--)
+ crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff];
+ crc ^= 0xffff;
+ return (crc & 0xffff);
+}
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+#define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16)
+
+/* ---------------------------------------------------------------------- */
+/*
+ * The HDLC routines
+ */
+
+static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits,
+ int num)
+{
+ int added = 0;
+
+ while (s->hdlcrx.rx_state && num >= 8) {
+ if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) {
+ s->hdlcrx.rx_state = 0;
+ return 0;
+ }
+ *s->hdlcrx.bp++ = bits >> (32-num);
+ s->hdlcrx.len++;
+ num -= 8;
+ added += 8;
+ }
+ return added;
+}
+
+static void hdlc_rx_flag(struct device *dev, struct hdlcdrv_state *s)
+{
+ struct sk_buff *skb;
+ int pkt_len;
+ unsigned char *cp;
+
+ if (s->hdlcrx.len < 4)
+ return;
+ if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len))
+ return;
+ pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */
+ if (!(skb = dev_alloc_skb(pkt_len))) {
+ printk("%s: memory squeeze, dropping packet\n",
+ s->ifname);
+ s->stats.rx_dropped++;
+ return;
+ }
+ skb->dev = dev;
+ cp = skb_put(skb, pkt_len);
+ *cp++ = 0; /* KISS kludge */
+ memcpy(cp, s->hdlcrx.buffer, pkt_len - 1);
+ skb->protocol = htons(ETH_P_AX25);
+ skb->mac.raw = skb->data;
+ netif_rx(skb);
+ s->stats.rx_packets++;
+}
+
+void hdlcdrv_receiver(struct device *dev, struct hdlcdrv_state *s)
+{
+ int i;
+ unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word;
+
+ if (!s || s->magic != HDLCDRV_MAGIC)
+ return;
+ if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx))
+ return;
+
+ while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) {
+ word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf);
+
+#ifdef HDLCDRV_DEBUG
+ hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word);
+#endif /* HDLCDRV_DEBUG */
+ s->hdlcrx.bitstream >>= 16;
+ s->hdlcrx.bitstream |= word << 16;
+ s->hdlcrx.bitbuf >>= 16;
+ s->hdlcrx.bitbuf |= word << 16;
+ s->hdlcrx.numbits += 16;
+ for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00,
+ mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff;
+ i >= 0;
+ i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1,
+ mask5 <<= 1, mask6 = (mask6 << 1) | 1) {
+ if ((s->hdlcrx.bitstream & mask1) == mask1)
+ s->hdlcrx.rx_state = 0; /* abort received */
+ else if ((s->hdlcrx.bitstream & mask2) == mask3) {
+ /* flag received */
+ if (s->hdlcrx.rx_state) {
+ hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf
+ << (8+i),
+ s->hdlcrx.numbits
+ -8-i);
+ hdlc_rx_flag(dev, s);
+ }
+ s->hdlcrx.len = 0;
+ s->hdlcrx.bp = s->hdlcrx.buffer;
+ s->hdlcrx.rx_state = 1;
+ s->hdlcrx.numbits = i;
+ } else if ((s->hdlcrx.bitstream & mask4) == mask5) {
+ /* stuffed bit */
+ s->hdlcrx.numbits--;
+ s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) |
+ ((s->hdlcrx.bitbuf & mask6) << 1);
+ }
+ }
+ s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf,
+ s->hdlcrx.numbits);
+ }
+ clear_bit(0, &s->hdlcrx.in_hdlc_rx);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void inline do_kiss_params(struct hdlcdrv_state *s,
+ unsigned char *data, unsigned long len)
+{
+
+#ifdef KISS_VERBOSE
+#define PKP(a,b) printk(KERN_INFO "%s: channel params: " a "\n", s->ifname, b)
+#else /* KISS_VERBOSE */
+#define PKP(a,b)
+#endif /* KISS_VERBOSE */
+
+ if (len < 2)
+ return;
+ switch(data[0]) {
+ case PARAM_TXDELAY:
+ s->ch_params.tx_delay = data[1];
+ PKP("TX delay = %ums", 10 * s->ch_params.tx_delay);
+ break;
+ case PARAM_PERSIST:
+ s->ch_params.ppersist = data[1];
+ PKP("p persistence = %u", s->ch_params.ppersist);
+ break;
+ case PARAM_SLOTTIME:
+ s->ch_params.slottime = data[1];
+ PKP("slot time = %ums", s->ch_params.slottime);
+ break;
+ case PARAM_TXTAIL:
+ s->ch_params.tx_tail = data[1];
+ PKP("TX tail = %ums", s->ch_params.tx_tail);
+ break;
+ case PARAM_FULLDUP:
+ s->ch_params.fulldup = !!data[1];
+ PKP("%s duplex", s->ch_params.fulldup ? "full" : "half");
+ break;
+ default:
+ break;
+ }
+#undef PKP
+}
+
+/* ---------------------------------------------------------------------- */
+
+void hdlcdrv_transmitter(struct device *dev, struct hdlcdrv_state *s)
+{
+ unsigned int mask1, mask2, mask3;
+ int i;
+ struct sk_buff *skb;
+ int pkt_len;
+
+ if (!s || s->magic != HDLCDRV_MAGIC)
+ return;
+ if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx))
+ return;
+ for (;;) {
+ if (s->hdlctx.numbits >= 16) {
+ if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) {
+ clear_bit(0, &s->hdlctx.in_hdlc_tx);
+ return;
+ }
+ hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf);
+ s->hdlctx.bitbuf >>= 16;
+ s->hdlctx.numbits -= 16;
+ }
+ switch (s->hdlctx.tx_state) {
+ default:
+ clear_bit(0, &s->hdlctx.in_hdlc_tx);
+ return;
+ case 0:
+ case 1:
+ if (s->hdlctx.numflags) {
+ s->hdlctx.numflags--;
+ s->hdlctx.bitbuf |=
+ 0x7e7e << s->hdlctx.numbits;
+ s->hdlctx.numbits += 16;
+ break;
+ }
+ if (s->hdlctx.tx_state == 1) {
+ clear_bit(0, &s->hdlctx.in_hdlc_tx);
+ return;
+ }
+ if (!(skb = skb_dequeue(&s->send_queue))) {
+ int flgs = tenms_to_2flags
+ (s, s->ch_params.tx_tail);
+ if (flgs < 2)
+ flgs = 2;
+ s->hdlctx.tx_state = 1;
+ s->hdlctx.numflags = flgs;
+ break;
+ }
+ if (skb->data[0] != 0) {
+ do_kiss_params(s, skb->data, skb->len);
+ dev_kfree_skb(skb, FREE_WRITE);
+ break;
+ }
+ pkt_len = skb->len-1; /* strip KISS byte */
+ if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) {
+ s->hdlctx.tx_state = 0;
+ s->hdlctx.numflags = 1;
+ dev_kfree_skb(skb, FREE_WRITE);
+ break;
+ }
+ memcpy(s->hdlctx.buffer, skb->data+1, pkt_len);
+ dev_kfree_skb(skb, FREE_WRITE);
+ s->hdlctx.bp = s->hdlctx.buffer;
+ append_crc_ccitt(s->hdlctx.buffer, pkt_len);
+ s->hdlctx.len = pkt_len+2; /* the appended CRC */
+ s->hdlctx.tx_state = 2;
+ s->hdlctx.bitstream = 0;
+ s->stats.tx_packets++;
+ break;
+ case 2:
+ if (!s->hdlctx.len) {
+ s->hdlctx.tx_state = 0;
+ s->hdlctx.numflags = 1;
+ break;
+ }
+ s->hdlctx.len--;
+ s->hdlctx.bitbuf |= *s->hdlctx.bp <<
+ s->hdlctx.numbits;
+ s->hdlctx.bitstream >>= 8;
+ s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16;
+ mask1 = 0x1f000;
+ mask2 = 0x10000;
+ mask3 = 0xffffffff >> (31-s->hdlctx.numbits);
+ s->hdlctx.numbits += 8;
+ for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1,
+ mask3 = (mask3 << 1) | 1) {
+ if ((s->hdlctx.bitstream & mask1) != mask1)
+ continue;
+ s->hdlctx.bitstream &= ~mask2;
+ s->hdlctx.bitbuf =
+ (s->hdlctx.bitbuf & mask3) |
+ ((s->hdlctx.bitbuf &
+ (~mask3)) << 1);
+ s->hdlctx.numbits++;
+ mask3 = (mask3 << 1) | 1;
+ }
+ break;
+ }
+ }
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void start_tx(struct device *dev, struct hdlcdrv_state *s)
+{
+ s->hdlctx.tx_state = 0;
+ s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay);
+ s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0;
+ hdlcdrv_transmitter(dev, s);
+ s->hdlctx.ptt = 1;
+ s->ptt_keyed++;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static unsigned short random_seed;
+
+static inline unsigned short random_num(void)
+{
+ random_seed = 28629 * random_seed + 157;
+ return random_seed;
+}
+
+/* ---------------------------------------------------------------------- */
+
+void hdlcdrv_arbitrate(struct device *dev, struct hdlcdrv_state *s)
+{
+ if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt ||
+ skb_queue_empty(&s->send_queue))
+ return;
+ if (s->ch_params.fulldup) {
+ start_tx(dev, s);
+ return;
+ }
+ if (s->hdlcrx.dcd) {
+ s->hdlctx.slotcnt = s->ch_params.slottime;
+ return;
+ }
+ if ((--s->hdlctx.slotcnt) > 0)
+ return;
+ s->hdlctx.slotcnt = s->ch_params.slottime;
+ if ((random_num() % 256) > s->ch_params.ppersist)
+ return;
+ start_tx(dev, s);
+}
+
+/* --------------------------------------------------------------------- */
+/*
+ * ===================== network driver interface =========================
+ */
+
+static inline int hdlcdrv_paranoia_check(struct device *dev,
+ const char *routine)
+{
+ if (!dev || !dev->priv ||
+ ((struct hdlcdrv_state *)dev->priv)->magic != HDLCDRV_MAGIC) {
+ printk(KERN_ERR "hdlcdrv: bad magic number for hdlcdrv_state "
+ "struct in routine %s\n", routine);
+ return 1;
+ }
+ return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int hdlcdrv_send_packet(struct sk_buff *skb, struct device *dev)
+{
+ struct hdlcdrv_state *sm;
+
+ if (hdlcdrv_paranoia_check(dev, "hdlcdrv_send_packet"))
+ return 0;
+ sm = (struct hdlcdrv_state *)dev->priv;
+ /*
+ * If some higher layer thinks we've missed an tx-done interrupt
+ * we are passed NULL. Caution: dev_tint() handles the cli()/sti()
+ * itself.
+ */
+ if (skb == NULL) {
+ dev_tint(dev);
+ return 0;
+ }
+ skb_queue_tail(&sm->send_queue, skb);
+ dev->trans_start = jiffies;
+ return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int hdlcdrv_set_mac_address(struct device *dev, void *addr)
+{
+ struct sockaddr *sa = (struct sockaddr *)addr;
+
+ /* addr is an AX.25 shifted ASCII mac address */
+ memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
+ return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+#if LINUX_VERSION_CODE >= 0x20119
+static struct net_device_stats *hdlcdrv_get_stats(struct device *dev)
+#else
+static struct enet_statistics *hdlcdrv_get_stats(struct device *dev)
+#endif
+{
+ struct hdlcdrv_state *sm;
+
+ if (hdlcdrv_paranoia_check(dev, "hdlcdrv_get_stats"))
+ return NULL;
+ sm = (struct hdlcdrv_state *)dev->priv;
+ /*
+ * Get the current statistics. This may be called with the
+ * card open or closed.
+ */
+ return &sm->stats;
+}
+
+/* --------------------------------------------------------------------- */
+/*
+ * Open/initialize the board. This is called (in the current kernel)
+ * sometime after booting when the 'ifconfig' program is run.
+ *
+ * This routine should set everything up anew at each open, even
+ * registers that "should" only need to be set once at boot, so that
+ * there is non-reboot way to recover if something goes wrong.
+ */
+
+static int hdlcdrv_open(struct device *dev)
+{
+ struct hdlcdrv_state *s;
+ int i;
+
+ if (hdlcdrv_paranoia_check(dev, "hdlcdrv_open"))
+ return -EINVAL;
+ s = (struct hdlcdrv_state *)dev->priv;
+
+ if (dev->start)
+ return 0;
+ if (!s->ops || !s->ops->open)
+ return -ENODEV;
+
+ dev->start = 1;
+ /*
+ * initialise some variables
+ */
+ s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
+ s->hdlcrx.in_hdlc_rx = 0;
+ s->hdlcrx.rx_state = 0;
+
+ s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
+ s->hdlctx.in_hdlc_tx = 0;
+ s->hdlctx.tx_state = 1;
+ s->hdlctx.numflags = 0;
+ s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
+ s->hdlctx.ptt = 0;
+ s->hdlctx.slotcnt = s->ch_params.slottime;
+ s->hdlctx.calibrate = 0;
+
+ i = s->ops->open(dev);
+ if (i) {
+ dev->start = 0;
+ return i;
+ }
+
+ dev->tbusy = 0;
+ dev->interrupt = 0;
+
+ return 0;
+}
+
+/* --------------------------------------------------------------------- */
+/*
+ * The inverse routine to hdlcdrv_open().
+ */
+
+static int hdlcdrv_close(struct device *dev)
+{
+ struct hdlcdrv_state *s;
+ struct sk_buff *skb;
+ int i = 0;
+
+ if (hdlcdrv_paranoia_check(dev, "hdlcdrv_close"))
+ return -EINVAL;
+ s = (struct hdlcdrv_state *)dev->priv;
+
+ if (!dev->start)
+ return 0;
+ dev->start = 0;
+ dev->tbusy = 1;
+
+ if (s->ops && s->ops->close)
+ i = s->ops->close(dev);
+ /* Free any buffers left in the hardware transmit queue */
+ while ((skb = skb_dequeue(&s->send_queue)))
+ dev_kfree_skb(skb, FREE_WRITE);
+ return i;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int hdlcdrv_ioctl(struct device *dev, struct ifreq *ifr, int cmd)
+{
+ struct hdlcdrv_state *s;
+ struct hdlcdrv_ioctl bi;
+
+ if (hdlcdrv_paranoia_check(dev, "hdlcdrv_ioctl"))
+ return -EINVAL;
+ s = (struct hdlcdrv_state *)dev->priv;
+
+ if (cmd != SIOCDEVPRIVATE) {
+ if (s->ops && s->ops->ioctl)
+ return s->ops->ioctl(dev, ifr, &bi, cmd);
+ return -ENOIOCTLCMD;
+ }
+ if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
+ return -EFAULT;
+
+ switch (bi.cmd) {
+ default:
+ if (s->ops && s->ops->ioctl)
+ return s->ops->ioctl(dev, ifr, &bi, cmd);
+ return -ENOIOCTLCMD;
+
+ case HDLCDRVCTL_GETCHANNELPAR:
+ bi.data.cp.tx_delay = s->ch_params.tx_delay;
+ bi.data.cp.tx_tail = s->ch_params.tx_tail;
+ bi.data.cp.slottime = s->ch_params.slottime;
+ bi.data.cp.ppersist = s->ch_params.ppersist;
+ bi.data.cp.fulldup = s->ch_params.fulldup;
+ break;
+
+ case HDLCDRVCTL_SETCHANNELPAR:
+ if (!suser())
+ return -EACCES;
+ s->ch_params.tx_delay = bi.data.cp.tx_delay;
+ s->ch_params.tx_tail = bi.data.cp.tx_tail;
+ s->ch_params.slottime = bi.data.cp.slottime;
+ s->ch_params.ppersist = bi.data.cp.ppersist;
+ s->ch_params.fulldup = bi.data.cp.fulldup;
+ s->hdlctx.slotcnt = 1;
+ return 0;
+
+ case HDLCDRVCTL_GETMODEMPAR:
+ bi.data.mp.iobase = dev->base_addr;
+ bi.data.mp.irq = dev->irq;
+ bi.data.mp.dma = dev->dma;
+ bi.data.mp.dma2 = s->ptt_out.dma2;
+ bi.data.mp.seriobase = s->ptt_out.seriobase;
+ bi.data.mp.pariobase = s->ptt_out.pariobase;
+ bi.data.mp.midiiobase = s->ptt_out.midiiobase;
+ break;
+
+ case HDLCDRVCTL_SETMODEMPAR:
+ if ((!suser()) || dev->start)
+ return -EACCES;
+ dev->base_addr = bi.data.mp.iobase;
+ dev->irq = bi.data.mp.irq;
+ dev->dma = bi.data.mp.dma;
+ s->ptt_out.dma2 = bi.data.mp.dma2;
+ s->ptt_out.seriobase = bi.data.mp.seriobase;
+ s->ptt_out.pariobase = bi.data.mp.pariobase;
+ s->ptt_out.midiiobase = bi.data.mp.midiiobase;
+ return 0;
+
+ case HDLCDRVCTL_GETSTAT:
+ bi.data.cs.ptt = hdlcdrv_ptt(s);
+ bi.data.cs.dcd = s->hdlcrx.dcd;
+ bi.data.cs.ptt_keyed = s->ptt_keyed;
+ bi.data.cs.tx_packets = s->stats.tx_packets;
+ bi.data.cs.tx_errors = s->stats.tx_errors;
+ bi.data.cs.rx_packets = s->stats.rx_packets;
+ bi.data.cs.rx_errors = s->stats.rx_errors;
+ break;
+
+ case HDLCDRVCTL_OLDGETSTAT:
+ bi.data.ocs.ptt = hdlcdrv_ptt(s);
+ bi.data.ocs.dcd = s->hdlcrx.dcd;
+ bi.data.ocs.ptt_keyed = s->ptt_keyed;
+#if LINUX_VERSION_CODE < 0x20100
+ bi.data.ocs.stats = s->stats;
+#endif
+ break;
+
+ case HDLCDRVCTL_CALIBRATE:
+ s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16;
+ return 0;
+
+ case HDLCDRVCTL_GETSAMPLES:
+#ifndef HDLCDRV_DEBUG
+ return -EPERM;
+#else /* HDLCDRV_DEBUG */
+ if (s->bitbuf_channel.rd == s->bitbuf_channel.wr)
+ return -EAGAIN;
+ bi.data.bits =
+ s->bitbuf_channel.buffer[s->bitbuf_channel.rd];
+ s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) %
+ sizeof(s->bitbuf_channel.buffer);
+ break;
+#endif /* HDLCDRV_DEBUG */
+
+ case HDLCDRVCTL_GETBITS:
+#ifndef HDLCDRV_DEBUG
+ return -EPERM;
+#else /* HDLCDRV_DEBUG */
+ if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr)
+ return -EAGAIN;
+ bi.data.bits =
+ s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd];
+ s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) %
+ sizeof(s->bitbuf_hdlc.buffer);
+ break;
+#endif /* HDLCDRV_DEBUG */
+
+ case HDLCDRVCTL_DRIVERNAME:
+ if (s->ops && s->ops->drvname) {
+ strncpy(bi.data.drivername, s->ops->drvname,
+ sizeof(bi.data.drivername));
+ break;
+ }
+ bi.data.drivername[0] = '\0';
+ break;
+
+ }
+ if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
+ return -EFAULT;
+ return 0;
+
+}
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * Check for a network adaptor of this type, and return '0' if one exists.
+ * If dev->base_addr == 0, probe all likely locations.
+ * If dev->base_addr == 1, always return failure.
+ * If dev->base_addr == 2, allocate space for the device and return success
+ * (detachable devices only).
+ */
+static int hdlcdrv_probe(struct device *dev)
+{
+ const struct hdlcdrv_channel_params dflt_ch_params = {
+ 20, 2, 10, 40, 0
+ };
+ struct hdlcdrv_state *s;
+
+ if (!dev)
+ return -ENXIO;
+ /*
+ * not a real probe! only initialize data structures
+ */
+ s = (struct hdlcdrv_state *)dev->priv;
+ /*
+ * initialize the hdlcdrv_state struct
+ */
+ s->ch_params = dflt_ch_params;
+ s->ptt_keyed = 0;
+
+ s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
+ s->hdlcrx.in_hdlc_rx = 0;
+ s->hdlcrx.rx_state = 0;
+
+ s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
+ s->hdlctx.in_hdlc_tx = 0;
+ s->hdlctx.tx_state = 1;
+ s->hdlctx.numflags = 0;
+ s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
+ s->hdlctx.ptt = 0;
+ s->hdlctx.slotcnt = s->ch_params.slottime;
+ s->hdlctx.calibrate = 0;
+
+#ifdef HDLCDRV_DEBUG
+ s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0;
+ s->bitbuf_channel.shreg = 0x80;
+
+ s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0;
+ s->bitbuf_hdlc.shreg = 0x80;
+#endif /* HDLCDRV_DEBUG */
+
+ /*
+ * initialize the device struct
+ */
+ dev->open = hdlcdrv_open;
+ dev->stop = hdlcdrv_close;
+ dev->do_ioctl = hdlcdrv_ioctl;
+ dev->hard_start_xmit = hdlcdrv_send_packet;
+ dev->get_stats = hdlcdrv_get_stats;
+
+ /* Fill in the fields of the device structure */
+
+ dev_init_buffers(dev);
+
+ skb_queue_head_init(&s->send_queue);
+
+#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
+ dev->hard_header = ax25_encapsulate;
+ dev->rebuild_header = ax25_rebuild_header;
+#else /* CONFIG_AX25 || CONFIG_AX25_MODULE */
+ dev->hard_header = NULL;
+ dev->rebuild_header = NULL;
+#endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
+ dev->set_mac_address = hdlcdrv_set_mac_address;
+
+ dev->type = ARPHRD_AX25; /* AF_AX25 device */
+ dev->hard_header_len = 73; /* We do digipeaters now */
+ dev->mtu = 1500; /* eth_mtu is the default */
+ dev->addr_len = 7; /* sizeof an ax.25 address */
+ memcpy(dev->broadcast, ax25_bcast, 7);
+ memcpy(dev->dev_addr, ax25_test, 7);
+
+ /* New style flags */
+ dev->flags = 0;
+ dev->family = AF_INET;
+ dev->pa_addr = 0;
+ dev->pa_brdaddr = 0;
+ dev->pa_mask = 0;
+ dev->pa_alen = sizeof(unsigned long);
+
+ return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+int hdlcdrv_register_hdlcdrv(struct device *dev, const struct hdlcdrv_ops *ops,
+ unsigned int privsize, char *ifname,
+ unsigned int baseaddr, unsigned int irq,
+ unsigned int dma)
+{
+ struct hdlcdrv_state *s;
+
+ if (!dev || !ops)
+ return -EACCES;
+ if (privsize < sizeof(struct hdlcdrv_state))
+ privsize = sizeof(struct hdlcdrv_state);
+ memset(dev, 0, sizeof(struct device));
+ if (!(s = dev->priv = kmalloc(privsize, GFP_KERNEL)))
+ return -ENOMEM;
+ /*
+ * initialize part of the hdlcdrv_state struct
+ */
+ memset(s, 0, privsize);
+ s->magic = HDLCDRV_MAGIC;
+ strncpy(s->ifname, ifname, sizeof(s->ifname));
+ s->ops = ops;
+ /*
+ * initialize part of the device struct
+ */
+ dev->name = s->ifname;
+ dev->if_port = 0;
+ dev->init = hdlcdrv_probe;
+ dev->start = 0;
+ dev->tbusy = 1;
+ dev->base_addr = baseaddr;
+ dev->irq = irq;
+ dev->dma = dma;
+ if (register_netdev(dev)) {
+ printk(KERN_WARNING "hdlcdrv: cannot register net "
+ "device %s\n", s->ifname);
+ kfree(dev->priv);
+ return -ENXIO;
+ }
+ MOD_INC_USE_COUNT;
+ return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+int hdlcdrv_unregister_hdlcdrv(struct device *dev)
+{
+ struct hdlcdrv_state *s;
+
+ if (!dev)
+ return -EINVAL;
+ if (!(s = (struct hdlcdrv_state *)dev->priv))
+ return -EINVAL;
+ if (s->magic != HDLCDRV_MAGIC)
+ return -EINVAL;
+ if (dev->start && s->ops->close)
+ s->ops->close(dev);
+ unregister_netdev(dev);
+ kfree(s);
+ MOD_DEC_USE_COUNT;
+ return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+#if LINUX_VERSION_CODE >= 0x20115
+
+EXPORT_SYMBOL(hdlcdrv_receiver);
+EXPORT_SYMBOL(hdlcdrv_transmitter);
+EXPORT_SYMBOL(hdlcdrv_arbitrate);
+EXPORT_SYMBOL(hdlcdrv_register_hdlcdrv);
+EXPORT_SYMBOL(hdlcdrv_unregister_hdlcdrv);
+
+#else
+
+static struct symbol_table hdlcdrv_syms = {
+#include <linux/symtab_begin.h>
+ X(hdlcdrv_receiver),
+ X(hdlcdrv_transmitter),
+ X(hdlcdrv_arbitrate),
+ X(hdlcdrv_register_hdlcdrv),
+ X(hdlcdrv_unregister_hdlcdrv),
+#include <linux/symtab_end.h>
+};
+
+#endif
+
+/* --------------------------------------------------------------------- */
+
+#ifdef MODULE
+
+#if LINUX_VERSION_CODE >= 0x20115
+
+MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
+MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder");
+
+#endif
+
+/* --------------------------------------------------------------------- */
+
+__initfunc(int init_module(void))
+{
+ printk(KERN_INFO "hdlcdrv: (C) 1996 Thomas Sailer HB9JNX/AE4WA\n");
+ printk(KERN_INFO "hdlcdrv: version 0.4 compiled " __TIME__ " " __DATE__ "\n");
+#if LINUX_VERSION_CODE < 0x20115
+ register_symtab(&hdlcdrv_syms);
+#endif
+ return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+void cleanup_module(void)
+{
+ printk(KERN_INFO "hdlcdrv: cleanup\n");
+}
+
+#endif /* MODULE */
+/* --------------------------------------------------------------------- */
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov