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!
diff --git a/drivers/net/wan/syncppp.c b/drivers/net/wan/syncppp.c
new file mode 100644
index 0000000..84b65c6
--- /dev/null
+++ b/drivers/net/wan/syncppp.c
@@ -0,0 +1,1488 @@
+/*
+ * NET3: A (fairly minimal) implementation of synchronous PPP for Linux
+ * as well as a CISCO HDLC implementation. See the copyright
+ * message below for the original source.
+ *
+ * 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.
+ *
+ * Note however. This code is also used in a different form by FreeBSD.
+ * Therefore when making any non OS specific change please consider
+ * contributing it back to the original author under the terms
+ * below in addition.
+ * -- Alan
+ *
+ * Port for Linux-2.1 by Jan "Yenya" Kasprzak <kas@fi.muni.cz>
+ */
+
+/*
+ * Synchronous PPP/Cisco link level subroutines.
+ * Keepalive protocol implemented in both Cisco and PPP modes.
+ *
+ * Copyright (C) 1994 Cronyx Ltd.
+ * Author: Serge Vakulenko, <vak@zebub.msk.su>
+ *
+ * This software is distributed with NO WARRANTIES, not even the implied
+ * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Authors grant any other persons or organisations permission to use
+ * or modify this software as long as this message is kept with the software,
+ * all derivative works or modified versions.
+ *
+ * Version 1.9, Wed Oct 4 18:58:15 MSK 1995
+ *
+ * $Id: syncppp.c,v 1.18 2000/04/11 05:25:31 asj Exp $
+ */
+#undef DEBUG
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/if_arp.h>
+#include <linux/skbuff.h>
+#include <linux/route.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/random.h>
+#include <linux/pkt_sched.h>
+#include <linux/spinlock.h>
+#include <linux/rcupdate.h>
+
+#include <net/syncppp.h>
+
+#include <asm/byteorder.h>
+#include <asm/uaccess.h>
+
+#define MAXALIVECNT 6 /* max. alive packets */
+
+#define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
+#define PPP_UI 0x03 /* Unnumbered Information */
+#define PPP_IP 0x0021 /* Internet Protocol */
+#define PPP_ISO 0x0023 /* ISO OSI Protocol */
+#define PPP_XNS 0x0025 /* Xerox NS Protocol */
+#define PPP_IPX 0x002b /* Novell IPX Protocol */
+#define PPP_LCP 0xc021 /* Link Control Protocol */
+#define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */
+
+#define LCP_CONF_REQ 1 /* PPP LCP configure request */
+#define LCP_CONF_ACK 2 /* PPP LCP configure acknowledge */
+#define LCP_CONF_NAK 3 /* PPP LCP configure negative ack */
+#define LCP_CONF_REJ 4 /* PPP LCP configure reject */
+#define LCP_TERM_REQ 5 /* PPP LCP terminate request */
+#define LCP_TERM_ACK 6 /* PPP LCP terminate acknowledge */
+#define LCP_CODE_REJ 7 /* PPP LCP code reject */
+#define LCP_PROTO_REJ 8 /* PPP LCP protocol reject */
+#define LCP_ECHO_REQ 9 /* PPP LCP echo request */
+#define LCP_ECHO_REPLY 10 /* PPP LCP echo reply */
+#define LCP_DISC_REQ 11 /* PPP LCP discard request */
+
+#define LCP_OPT_MRU 1 /* maximum receive unit */
+#define LCP_OPT_ASYNC_MAP 2 /* async control character map */
+#define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */
+#define LCP_OPT_QUAL_PROTO 4 /* quality protocol */
+#define LCP_OPT_MAGIC 5 /* magic number */
+#define LCP_OPT_RESERVED 6 /* reserved */
+#define LCP_OPT_PROTO_COMP 7 /* protocol field compression */
+#define LCP_OPT_ADDR_COMP 8 /* address/control field compression */
+
+#define IPCP_CONF_REQ LCP_CONF_REQ /* PPP IPCP configure request */
+#define IPCP_CONF_ACK LCP_CONF_ACK /* PPP IPCP configure acknowledge */
+#define IPCP_CONF_NAK LCP_CONF_NAK /* PPP IPCP configure negative ack */
+#define IPCP_CONF_REJ LCP_CONF_REJ /* PPP IPCP configure reject */
+#define IPCP_TERM_REQ LCP_TERM_REQ /* PPP IPCP terminate request */
+#define IPCP_TERM_ACK LCP_TERM_ACK /* PPP IPCP terminate acknowledge */
+#define IPCP_CODE_REJ LCP_CODE_REJ /* PPP IPCP code reject */
+
+#define CISCO_MULTICAST 0x8f /* Cisco multicast address */
+#define CISCO_UNICAST 0x0f /* Cisco unicast address */
+#define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
+#define CISCO_ADDR_REQ 0 /* Cisco address request */
+#define CISCO_ADDR_REPLY 1 /* Cisco address reply */
+#define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
+
+struct ppp_header {
+ u8 address;
+ u8 control;
+ u16 protocol;
+};
+#define PPP_HEADER_LEN sizeof (struct ppp_header)
+
+struct lcp_header {
+ u8 type;
+ u8 ident;
+ u16 len;
+};
+#define LCP_HEADER_LEN sizeof (struct lcp_header)
+
+struct cisco_packet {
+ u32 type;
+ u32 par1;
+ u32 par2;
+ u16 rel;
+ u16 time0;
+ u16 time1;
+};
+#define CISCO_PACKET_LEN 18
+#define CISCO_BIG_PACKET_LEN 20
+
+static struct sppp *spppq;
+static struct timer_list sppp_keepalive_timer;
+static DEFINE_SPINLOCK(spppq_lock);
+
+/* global xmit queue for sending packets while spinlock is held */
+static struct sk_buff_head tx_queue;
+
+static void sppp_keepalive (unsigned long dummy);
+static void sppp_cp_send (struct sppp *sp, u16 proto, u8 type,
+ u8 ident, u16 len, void *data);
+static void sppp_cisco_send (struct sppp *sp, int type, long par1, long par2);
+static void sppp_lcp_input (struct sppp *sp, struct sk_buff *m);
+static void sppp_cisco_input (struct sppp *sp, struct sk_buff *m);
+static void sppp_ipcp_input (struct sppp *sp, struct sk_buff *m);
+static void sppp_lcp_open (struct sppp *sp);
+static void sppp_ipcp_open (struct sppp *sp);
+static int sppp_lcp_conf_parse_options (struct sppp *sp, struct lcp_header *h,
+ int len, u32 *magic);
+static void sppp_cp_timeout (unsigned long arg);
+static char *sppp_lcp_type_name (u8 type);
+static char *sppp_ipcp_type_name (u8 type);
+static void sppp_print_bytes (u8 *p, u16 len);
+
+static int debug;
+
+/* Flush global outgoing packet queue to dev_queue_xmit().
+ *
+ * dev_queue_xmit() must be called with interrupts enabled
+ * which means it can't be called with spinlocks held.
+ * If a packet needs to be sent while a spinlock is held,
+ * then put the packet into tx_queue, and call sppp_flush_xmit()
+ * after spinlock is released.
+ */
+static void sppp_flush_xmit(void)
+{
+ struct sk_buff *skb;
+ while ((skb = skb_dequeue(&tx_queue)) != NULL)
+ dev_queue_xmit(skb);
+}
+
+/*
+ * Interface down stub
+ */
+
+static void if_down(struct net_device *dev)
+{
+ struct sppp *sp = (struct sppp *)sppp_of(dev);
+
+ sp->pp_link_state=SPPP_LINK_DOWN;
+}
+
+/*
+ * Timeout routine activations.
+ */
+
+static void sppp_set_timeout(struct sppp *p,int s)
+{
+ if (! (p->pp_flags & PP_TIMO))
+ {
+ init_timer(&p->pp_timer);
+ p->pp_timer.function=sppp_cp_timeout;
+ p->pp_timer.expires=jiffies+s*HZ;
+ p->pp_timer.data=(unsigned long)p;
+ p->pp_flags |= PP_TIMO;
+ add_timer(&p->pp_timer);
+ }
+}
+
+static void sppp_clear_timeout(struct sppp *p)
+{
+ if (p->pp_flags & PP_TIMO)
+ {
+ del_timer(&p->pp_timer);
+ p->pp_flags &= ~PP_TIMO;
+ }
+}
+
+/**
+ * sppp_input - receive and process a WAN PPP frame
+ * @skb: The buffer to process
+ * @dev: The device it arrived on
+ *
+ * This can be called directly by cards that do not have
+ * timing constraints but is normally called from the network layer
+ * after interrupt servicing to process frames queued via netif_rx().
+ *
+ * We process the options in the card. If the frame is destined for
+ * the protocol stacks then it requeues the frame for the upper level
+ * protocol. If it is a control from it is processed and discarded
+ * here.
+ */
+
+void sppp_input (struct net_device *dev, struct sk_buff *skb)
+{
+ struct ppp_header *h;
+ struct sppp *sp = (struct sppp *)sppp_of(dev);
+ unsigned long flags;
+
+ skb->dev=dev;
+ skb->mac.raw=skb->data;
+
+ if (dev->flags & IFF_RUNNING)
+ {
+ /* Count received bytes, add FCS and one flag */
+ sp->ibytes+= skb->len + 3;
+ sp->ipkts++;
+ }
+
+ if (!pskb_may_pull(skb, PPP_HEADER_LEN)) {
+ /* Too small packet, drop it. */
+ if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_DEBUG "%s: input packet is too small, %d bytes\n",
+ dev->name, skb->len);
+ kfree_skb(skb);
+ return;
+ }
+
+ /* Get PPP header. */
+ h = (struct ppp_header *)skb->data;
+ skb_pull(skb,sizeof(struct ppp_header));
+
+ spin_lock_irqsave(&sp->lock, flags);
+
+ switch (h->address) {
+ default: /* Invalid PPP packet. */
+ goto invalid;
+ case PPP_ALLSTATIONS:
+ if (h->control != PPP_UI)
+ goto invalid;
+ if (sp->pp_flags & PP_CISCO) {
+ if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_WARNING "%s: PPP packet in Cisco mode <0x%x 0x%x 0x%x>\n",
+ dev->name,
+ h->address, h->control, ntohs (h->protocol));
+ goto drop;
+ }
+ switch (ntohs (h->protocol)) {
+ default:
+ if (sp->lcp.state == LCP_STATE_OPENED)
+ sppp_cp_send (sp, PPP_LCP, LCP_PROTO_REJ,
+ ++sp->pp_seq, skb->len + 2,
+ &h->protocol);
+ if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_WARNING "%s: invalid input protocol <0x%x 0x%x 0x%x>\n",
+ dev->name,
+ h->address, h->control, ntohs (h->protocol));
+ goto drop;
+ case PPP_LCP:
+ sppp_lcp_input (sp, skb);
+ goto drop;
+ case PPP_IPCP:
+ if (sp->lcp.state == LCP_STATE_OPENED)
+ sppp_ipcp_input (sp, skb);
+ else
+ printk(KERN_DEBUG "IPCP when still waiting LCP finish.\n");
+ goto drop;
+ case PPP_IP:
+ if (sp->ipcp.state == IPCP_STATE_OPENED) {
+ if(sp->pp_flags&PP_DEBUG)
+ printk(KERN_DEBUG "Yow an IP frame.\n");
+ skb->protocol=htons(ETH_P_IP);
+ netif_rx(skb);
+ dev->last_rx = jiffies;
+ goto done;
+ }
+ break;
+#ifdef IPX
+ case PPP_IPX:
+ /* IPX IPXCP not implemented yet */
+ if (sp->lcp.state == LCP_STATE_OPENED) {
+ skb->protocol=htons(ETH_P_IPX);
+ netif_rx(skb);
+ dev->last_rx = jiffies;
+ goto done;
+ }
+ break;
+#endif
+ }
+ break;
+ case CISCO_MULTICAST:
+ case CISCO_UNICAST:
+ /* Don't check the control field here (RFC 1547). */
+ if (! (sp->pp_flags & PP_CISCO)) {
+ if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_WARNING "%s: Cisco packet in PPP mode <0x%x 0x%x 0x%x>\n",
+ dev->name,
+ h->address, h->control, ntohs (h->protocol));
+ goto drop;
+ }
+ switch (ntohs (h->protocol)) {
+ default:
+ goto invalid;
+ case CISCO_KEEPALIVE:
+ sppp_cisco_input (sp, skb);
+ goto drop;
+#ifdef CONFIG_INET
+ case ETH_P_IP:
+ skb->protocol=htons(ETH_P_IP);
+ netif_rx(skb);
+ dev->last_rx = jiffies;
+ goto done;
+#endif
+#ifdef CONFIG_IPX
+ case ETH_P_IPX:
+ skb->protocol=htons(ETH_P_IPX);
+ netif_rx(skb);
+ dev->last_rx = jiffies;
+ goto done;
+#endif
+ }
+ break;
+ }
+ goto drop;
+
+invalid:
+ if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_WARNING "%s: invalid input packet <0x%x 0x%x 0x%x>\n",
+ dev->name, h->address, h->control, ntohs (h->protocol));
+drop:
+ kfree_skb(skb);
+done:
+ spin_unlock_irqrestore(&sp->lock, flags);
+ sppp_flush_xmit();
+ return;
+}
+
+EXPORT_SYMBOL(sppp_input);
+
+/*
+ * Handle transmit packets.
+ */
+
+static int sppp_hard_header(struct sk_buff *skb, struct net_device *dev, __u16 type,
+ void *daddr, void *saddr, unsigned int len)
+{
+ struct sppp *sp = (struct sppp *)sppp_of(dev);
+ struct ppp_header *h;
+ skb_push(skb,sizeof(struct ppp_header));
+ h=(struct ppp_header *)skb->data;
+ if(sp->pp_flags&PP_CISCO)
+ {
+ h->address = CISCO_UNICAST;
+ h->control = 0;
+ }
+ else
+ {
+ h->address = PPP_ALLSTATIONS;
+ h->control = PPP_UI;
+ }
+ if(sp->pp_flags & PP_CISCO)
+ {
+ h->protocol = htons(type);
+ }
+ else switch(type)
+ {
+ case ETH_P_IP:
+ h->protocol = htons(PPP_IP);
+ break;
+ case ETH_P_IPX:
+ h->protocol = htons(PPP_IPX);
+ break;
+ }
+ return sizeof(struct ppp_header);
+}
+
+static int sppp_rebuild_header(struct sk_buff *skb)
+{
+ return 0;
+}
+
+/*
+ * Send keepalive packets, every 10 seconds.
+ */
+
+static void sppp_keepalive (unsigned long dummy)
+{
+ struct sppp *sp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&spppq_lock, flags);
+
+ for (sp=spppq; sp; sp=sp->pp_next)
+ {
+ struct net_device *dev = sp->pp_if;
+
+ /* Keepalive mode disabled or channel down? */
+ if (! (sp->pp_flags & PP_KEEPALIVE) ||
+ ! (dev->flags & IFF_UP))
+ continue;
+
+ spin_lock(&sp->lock);
+
+ /* No keepalive in PPP mode if LCP not opened yet. */
+ if (! (sp->pp_flags & PP_CISCO) &&
+ sp->lcp.state != LCP_STATE_OPENED) {
+ spin_unlock(&sp->lock);
+ continue;
+ }
+
+ if (sp->pp_alivecnt == MAXALIVECNT) {
+ /* No keepalive packets got. Stop the interface. */
+ printk (KERN_WARNING "%s: protocol down\n", dev->name);
+ if_down (dev);
+ if (! (sp->pp_flags & PP_CISCO)) {
+ /* Shut down the PPP link. */
+ sp->lcp.magic = jiffies;
+ sp->lcp.state = LCP_STATE_CLOSED;
+ sp->ipcp.state = IPCP_STATE_CLOSED;
+ sppp_clear_timeout (sp);
+ /* Initiate negotiation. */
+ sppp_lcp_open (sp);
+ }
+ }
+ if (sp->pp_alivecnt <= MAXALIVECNT)
+ ++sp->pp_alivecnt;
+ if (sp->pp_flags & PP_CISCO)
+ sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, ++sp->pp_seq,
+ sp->pp_rseq);
+ else if (sp->lcp.state == LCP_STATE_OPENED) {
+ long nmagic = htonl (sp->lcp.magic);
+ sp->lcp.echoid = ++sp->pp_seq;
+ sppp_cp_send (sp, PPP_LCP, LCP_ECHO_REQ,
+ sp->lcp.echoid, 4, &nmagic);
+ }
+
+ spin_unlock(&sp->lock);
+ }
+ spin_unlock_irqrestore(&spppq_lock, flags);
+ sppp_flush_xmit();
+ sppp_keepalive_timer.expires=jiffies+10*HZ;
+ add_timer(&sppp_keepalive_timer);
+}
+
+/*
+ * Handle incoming PPP Link Control Protocol packets.
+ */
+
+static void sppp_lcp_input (struct sppp *sp, struct sk_buff *skb)
+{
+ struct lcp_header *h;
+ struct net_device *dev = sp->pp_if;
+ int len = skb->len;
+ u8 *p, opt[6];
+ u32 rmagic;
+
+ if (!pskb_may_pull(skb, sizeof(struct lcp_header))) {
+ if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_WARNING "%s: invalid lcp packet length: %d bytes\n",
+ dev->name, len);
+ return;
+ }
+ h = (struct lcp_header *)skb->data;
+ skb_pull(skb,sizeof(struct lcp_header *));
+
+ if (sp->pp_flags & PP_DEBUG)
+ {
+ char state = '?';
+ switch (sp->lcp.state) {
+ case LCP_STATE_CLOSED: state = 'C'; break;
+ case LCP_STATE_ACK_RCVD: state = 'R'; break;
+ case LCP_STATE_ACK_SENT: state = 'S'; break;
+ case LCP_STATE_OPENED: state = 'O'; break;
+ }
+ printk (KERN_WARNING "%s: lcp input(%c): %d bytes <%s id=%xh len=%xh",
+ dev->name, state, len,
+ sppp_lcp_type_name (h->type), h->ident, ntohs (h->len));
+ if (len > 4)
+ sppp_print_bytes ((u8*) (h+1), len-4);
+ printk (">\n");
+ }
+ if (len > ntohs (h->len))
+ len = ntohs (h->len);
+ switch (h->type) {
+ default:
+ /* Unknown packet type -- send Code-Reject packet. */
+ sppp_cp_send (sp, PPP_LCP, LCP_CODE_REJ, ++sp->pp_seq,
+ skb->len, h);
+ break;
+ case LCP_CONF_REQ:
+ if (len < 4) {
+ if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_DEBUG"%s: invalid lcp configure request packet length: %d bytes\n",
+ dev->name, len);
+ break;
+ }
+ if (len>4 && !sppp_lcp_conf_parse_options (sp, h, len, &rmagic))
+ goto badreq;
+ if (rmagic == sp->lcp.magic) {
+ /* Local and remote magics equal -- loopback? */
+ if (sp->pp_loopcnt >= MAXALIVECNT*5) {
+ printk (KERN_WARNING "%s: loopback\n",
+ dev->name);
+ sp->pp_loopcnt = 0;
+ if (dev->flags & IFF_UP) {
+ if_down (dev);
+ }
+ } else if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_DEBUG "%s: conf req: magic glitch\n",
+ dev->name);
+ ++sp->pp_loopcnt;
+
+ /* MUST send Conf-Nack packet. */
+ rmagic = ~sp->lcp.magic;
+ opt[0] = LCP_OPT_MAGIC;
+ opt[1] = sizeof (opt);
+ opt[2] = rmagic >> 24;
+ opt[3] = rmagic >> 16;
+ opt[4] = rmagic >> 8;
+ opt[5] = rmagic;
+ sppp_cp_send (sp, PPP_LCP, LCP_CONF_NAK,
+ h->ident, sizeof (opt), &opt);
+badreq:
+ switch (sp->lcp.state) {
+ case LCP_STATE_OPENED:
+ /* Initiate renegotiation. */
+ sppp_lcp_open (sp);
+ /* fall through... */
+ case LCP_STATE_ACK_SENT:
+ /* Go to closed state. */
+ sp->lcp.state = LCP_STATE_CLOSED;
+ sp->ipcp.state = IPCP_STATE_CLOSED;
+ }
+ break;
+ }
+ /* Send Configure-Ack packet. */
+ sp->pp_loopcnt = 0;
+ if (sp->lcp.state != LCP_STATE_OPENED) {
+ sppp_cp_send (sp, PPP_LCP, LCP_CONF_ACK,
+ h->ident, len-4, h+1);
+ }
+ /* Change the state. */
+ switch (sp->lcp.state) {
+ case LCP_STATE_CLOSED:
+ sp->lcp.state = LCP_STATE_ACK_SENT;
+ break;
+ case LCP_STATE_ACK_RCVD:
+ sp->lcp.state = LCP_STATE_OPENED;
+ sppp_ipcp_open (sp);
+ break;
+ case LCP_STATE_OPENED:
+ /* Remote magic changed -- close session. */
+ sp->lcp.state = LCP_STATE_CLOSED;
+ sp->ipcp.state = IPCP_STATE_CLOSED;
+ /* Initiate renegotiation. */
+ sppp_lcp_open (sp);
+ /* Send ACK after our REQ in attempt to break loop */
+ sppp_cp_send (sp, PPP_LCP, LCP_CONF_ACK,
+ h->ident, len-4, h+1);
+ sp->lcp.state = LCP_STATE_ACK_SENT;
+ break;
+ }
+ break;
+ case LCP_CONF_ACK:
+ if (h->ident != sp->lcp.confid)
+ break;
+ sppp_clear_timeout (sp);
+ if ((sp->pp_link_state != SPPP_LINK_UP) &&
+ (dev->flags & IFF_UP)) {
+ /* Coming out of loopback mode. */
+ sp->pp_link_state=SPPP_LINK_UP;
+ printk (KERN_INFO "%s: protocol up\n", dev->name);
+ }
+ switch (sp->lcp.state) {
+ case LCP_STATE_CLOSED:
+ sp->lcp.state = LCP_STATE_ACK_RCVD;
+ sppp_set_timeout (sp, 5);
+ break;
+ case LCP_STATE_ACK_SENT:
+ sp->lcp.state = LCP_STATE_OPENED;
+ sppp_ipcp_open (sp);
+ break;
+ }
+ break;
+ case LCP_CONF_NAK:
+ if (h->ident != sp->lcp.confid)
+ break;
+ p = (u8*) (h+1);
+ if (len>=10 && p[0] == LCP_OPT_MAGIC && p[1] >= 4) {
+ rmagic = (u32)p[2] << 24 |
+ (u32)p[3] << 16 | p[4] << 8 | p[5];
+ if (rmagic == ~sp->lcp.magic) {
+ int newmagic;
+ if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_DEBUG "%s: conf nak: magic glitch\n",
+ dev->name);
+ get_random_bytes(&newmagic, sizeof(newmagic));
+ sp->lcp.magic += newmagic;
+ } else
+ sp->lcp.magic = rmagic;
+ }
+ if (sp->lcp.state != LCP_STATE_ACK_SENT) {
+ /* Go to closed state. */
+ sp->lcp.state = LCP_STATE_CLOSED;
+ sp->ipcp.state = IPCP_STATE_CLOSED;
+ }
+ /* The link will be renegotiated after timeout,
+ * to avoid endless req-nack loop. */
+ sppp_clear_timeout (sp);
+ sppp_set_timeout (sp, 2);
+ break;
+ case LCP_CONF_REJ:
+ if (h->ident != sp->lcp.confid)
+ break;
+ sppp_clear_timeout (sp);
+ /* Initiate renegotiation. */
+ sppp_lcp_open (sp);
+ if (sp->lcp.state != LCP_STATE_ACK_SENT) {
+ /* Go to closed state. */
+ sp->lcp.state = LCP_STATE_CLOSED;
+ sp->ipcp.state = IPCP_STATE_CLOSED;
+ }
+ break;
+ case LCP_TERM_REQ:
+ sppp_clear_timeout (sp);
+ /* Send Terminate-Ack packet. */
+ sppp_cp_send (sp, PPP_LCP, LCP_TERM_ACK, h->ident, 0, NULL);
+ /* Go to closed state. */
+ sp->lcp.state = LCP_STATE_CLOSED;
+ sp->ipcp.state = IPCP_STATE_CLOSED;
+ /* Initiate renegotiation. */
+ sppp_lcp_open (sp);
+ break;
+ case LCP_TERM_ACK:
+ case LCP_CODE_REJ:
+ case LCP_PROTO_REJ:
+ /* Ignore for now. */
+ break;
+ case LCP_DISC_REQ:
+ /* Discard the packet. */
+ break;
+ case LCP_ECHO_REQ:
+ if (sp->lcp.state != LCP_STATE_OPENED)
+ break;
+ if (len < 8) {
+ if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_WARNING "%s: invalid lcp echo request packet length: %d bytes\n",
+ dev->name, len);
+ break;
+ }
+ if (ntohl (*(long*)(h+1)) == sp->lcp.magic) {
+ /* Line loopback mode detected. */
+ printk (KERN_WARNING "%s: loopback\n", dev->name);
+ if_down (dev);
+
+ /* Shut down the PPP link. */
+ sp->lcp.state = LCP_STATE_CLOSED;
+ sp->ipcp.state = IPCP_STATE_CLOSED;
+ sppp_clear_timeout (sp);
+ /* Initiate negotiation. */
+ sppp_lcp_open (sp);
+ break;
+ }
+ *(long*)(h+1) = htonl (sp->lcp.magic);
+ sppp_cp_send (sp, PPP_LCP, LCP_ECHO_REPLY, h->ident, len-4, h+1);
+ break;
+ case LCP_ECHO_REPLY:
+ if (h->ident != sp->lcp.echoid)
+ break;
+ if (len < 8) {
+ if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_WARNING "%s: invalid lcp echo reply packet length: %d bytes\n",
+ dev->name, len);
+ break;
+ }
+ if (ntohl (*(long*)(h+1)) != sp->lcp.magic)
+ sp->pp_alivecnt = 0;
+ break;
+ }
+}
+
+/*
+ * Handle incoming Cisco keepalive protocol packets.
+ */
+
+static void sppp_cisco_input (struct sppp *sp, struct sk_buff *skb)
+{
+ struct cisco_packet *h;
+ struct net_device *dev = sp->pp_if;
+
+ if (!pskb_may_pull(skb, sizeof(struct cisco_packet))
+ || (skb->len != CISCO_PACKET_LEN
+ && skb->len != CISCO_BIG_PACKET_LEN)) {
+ if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_WARNING "%s: invalid cisco packet length: %d bytes\n",
+ dev->name, skb->len);
+ return;
+ }
+ h = (struct cisco_packet *)skb->data;
+ skb_pull(skb, sizeof(struct cisco_packet*));
+ if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_WARNING "%s: cisco input: %d bytes <%xh %xh %xh %xh %xh-%xh>\n",
+ dev->name, skb->len,
+ ntohl (h->type), h->par1, h->par2, h->rel,
+ h->time0, h->time1);
+ switch (ntohl (h->type)) {
+ default:
+ if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_WARNING "%s: unknown cisco packet type: 0x%x\n",
+ dev->name, ntohl (h->type));
+ break;
+ case CISCO_ADDR_REPLY:
+ /* Reply on address request, ignore */
+ break;
+ case CISCO_KEEPALIVE_REQ:
+ sp->pp_alivecnt = 0;
+ sp->pp_rseq = ntohl (h->par1);
+ if (sp->pp_seq == sp->pp_rseq) {
+ /* Local and remote sequence numbers are equal.
+ * Probably, the line is in loopback mode. */
+ int newseq;
+ if (sp->pp_loopcnt >= MAXALIVECNT) {
+ printk (KERN_WARNING "%s: loopback\n",
+ dev->name);
+ sp->pp_loopcnt = 0;
+ if (dev->flags & IFF_UP) {
+ if_down (dev);
+ }
+ }
+ ++sp->pp_loopcnt;
+
+ /* Generate new local sequence number */
+ get_random_bytes(&newseq, sizeof(newseq));
+ sp->pp_seq ^= newseq;
+ break;
+ }
+ sp->pp_loopcnt = 0;
+ if (sp->pp_link_state==SPPP_LINK_DOWN &&
+ (dev->flags & IFF_UP)) {
+ sp->pp_link_state=SPPP_LINK_UP;
+ printk (KERN_INFO "%s: protocol up\n", dev->name);
+ }
+ break;
+ case CISCO_ADDR_REQ:
+ /* Stolen from net/ipv4/devinet.c -- SIOCGIFADDR ioctl */
+ {
+ struct in_device *in_dev;
+ struct in_ifaddr *ifa;
+ u32 addr = 0, mask = ~0; /* FIXME: is the mask correct? */
+#ifdef CONFIG_INET
+ rcu_read_lock();
+ if ((in_dev = __in_dev_get(dev)) != NULL)
+ {
+ for (ifa=in_dev->ifa_list; ifa != NULL;
+ ifa=ifa->ifa_next) {
+ if (strcmp(dev->name, ifa->ifa_label) == 0)
+ {
+ addr = ifa->ifa_local;
+ mask = ifa->ifa_mask;
+ break;
+ }
+ }
+ }
+ rcu_read_unlock();
+#endif
+ /* I hope both addr and mask are in the net order */
+ sppp_cisco_send (sp, CISCO_ADDR_REPLY, addr, mask);
+ break;
+ }
+ }
+}
+
+
+/*
+ * Send PPP LCP packet.
+ */
+
+static void sppp_cp_send (struct sppp *sp, u16 proto, u8 type,
+ u8 ident, u16 len, void *data)
+{
+ struct ppp_header *h;
+ struct lcp_header *lh;
+ struct sk_buff *skb;
+ struct net_device *dev = sp->pp_if;
+
+ skb=alloc_skb(dev->hard_header_len+PPP_HEADER_LEN+LCP_HEADER_LEN+len,
+ GFP_ATOMIC);
+ if (skb==NULL)
+ return;
+
+ skb_reserve(skb,dev->hard_header_len);
+
+ h = (struct ppp_header *)skb_put(skb, sizeof(struct ppp_header));
+ h->address = PPP_ALLSTATIONS; /* broadcast address */
+ h->control = PPP_UI; /* Unnumbered Info */
+ h->protocol = htons (proto); /* Link Control Protocol */
+
+ lh = (struct lcp_header *)skb_put(skb, sizeof(struct lcp_header));
+ lh->type = type;
+ lh->ident = ident;
+ lh->len = htons (LCP_HEADER_LEN + len);
+
+ if (len)
+ memcpy(skb_put(skb,len),data, len);
+
+ if (sp->pp_flags & PP_DEBUG) {
+ printk (KERN_WARNING "%s: %s output <%s id=%xh len=%xh",
+ dev->name,
+ proto==PPP_LCP ? "lcp" : "ipcp",
+ proto==PPP_LCP ? sppp_lcp_type_name (lh->type) :
+ sppp_ipcp_type_name (lh->type), lh->ident,
+ ntohs (lh->len));
+ if (len)
+ sppp_print_bytes ((u8*) (lh+1), len);
+ printk (">\n");
+ }
+ sp->obytes += skb->len;
+ /* Control is high priority so it doesn't get queued behind data */
+ skb->priority=TC_PRIO_CONTROL;
+ skb->dev = dev;
+ skb_queue_tail(&tx_queue, skb);
+}
+
+/*
+ * Send Cisco keepalive packet.
+ */
+
+static void sppp_cisco_send (struct sppp *sp, int type, long par1, long par2)
+{
+ struct ppp_header *h;
+ struct cisco_packet *ch;
+ struct sk_buff *skb;
+ struct net_device *dev = sp->pp_if;
+ u32 t = jiffies * 1000/HZ;
+
+ skb=alloc_skb(dev->hard_header_len+PPP_HEADER_LEN+CISCO_PACKET_LEN,
+ GFP_ATOMIC);
+
+ if(skb==NULL)
+ return;
+
+ skb_reserve(skb, dev->hard_header_len);
+ h = (struct ppp_header *)skb_put (skb, sizeof(struct ppp_header));
+ h->address = CISCO_MULTICAST;
+ h->control = 0;
+ h->protocol = htons (CISCO_KEEPALIVE);
+
+ ch = (struct cisco_packet*)skb_put(skb, CISCO_PACKET_LEN);
+ ch->type = htonl (type);
+ ch->par1 = htonl (par1);
+ ch->par2 = htonl (par2);
+ ch->rel = -1;
+ ch->time0 = htons ((u16) (t >> 16));
+ ch->time1 = htons ((u16) t);
+
+ if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_WARNING "%s: cisco output: <%xh %xh %xh %xh %xh-%xh>\n",
+ dev->name, ntohl (ch->type), ch->par1,
+ ch->par2, ch->rel, ch->time0, ch->time1);
+ sp->obytes += skb->len;
+ skb->priority=TC_PRIO_CONTROL;
+ skb->dev = dev;
+ skb_queue_tail(&tx_queue, skb);
+}
+
+/**
+ * sppp_close - close down a synchronous PPP or Cisco HDLC link
+ * @dev: The network device to drop the link of
+ *
+ * This drops the logical interface to the channel. It is not
+ * done politely as we assume we will also be dropping DTR. Any
+ * timeouts are killed.
+ */
+
+int sppp_close (struct net_device *dev)
+{
+ struct sppp *sp = (struct sppp *)sppp_of(dev);
+ unsigned long flags;
+
+ spin_lock_irqsave(&sp->lock, flags);
+ sp->pp_link_state = SPPP_LINK_DOWN;
+ sp->lcp.state = LCP_STATE_CLOSED;
+ sp->ipcp.state = IPCP_STATE_CLOSED;
+ sppp_clear_timeout (sp);
+ spin_unlock_irqrestore(&sp->lock, flags);
+
+ return 0;
+}
+
+EXPORT_SYMBOL(sppp_close);
+
+/**
+ * sppp_open - open a synchronous PPP or Cisco HDLC link
+ * @dev: Network device to activate
+ *
+ * Close down any existing synchronous session and commence
+ * from scratch. In the PPP case this means negotiating LCP/IPCP
+ * and friends, while for Cisco HDLC we simply need to start sending
+ * keepalives
+ */
+
+int sppp_open (struct net_device *dev)
+{
+ struct sppp *sp = (struct sppp *)sppp_of(dev);
+ unsigned long flags;
+
+ sppp_close(dev);
+
+ spin_lock_irqsave(&sp->lock, flags);
+ if (!(sp->pp_flags & PP_CISCO)) {
+ sppp_lcp_open (sp);
+ }
+ sp->pp_link_state = SPPP_LINK_DOWN;
+ spin_unlock_irqrestore(&sp->lock, flags);
+ sppp_flush_xmit();
+
+ return 0;
+}
+
+EXPORT_SYMBOL(sppp_open);
+
+/**
+ * sppp_reopen - notify of physical link loss
+ * @dev: Device that lost the link
+ *
+ * This function informs the synchronous protocol code that
+ * the underlying link died (for example a carrier drop on X.21)
+ *
+ * We increment the magic numbers to ensure that if the other end
+ * failed to notice we will correctly start a new session. It happens
+ * do to the nature of telco circuits is that you can lose carrier on
+ * one endonly.
+ *
+ * Having done this we go back to negotiating. This function may
+ * be called from an interrupt context.
+ */
+
+int sppp_reopen (struct net_device *dev)
+{
+ struct sppp *sp = (struct sppp *)sppp_of(dev);
+ unsigned long flags;
+
+ sppp_close(dev);
+
+ spin_lock_irqsave(&sp->lock, flags);
+ if (!(sp->pp_flags & PP_CISCO))
+ {
+ sp->lcp.magic = jiffies;
+ ++sp->pp_seq;
+ sp->lcp.state = LCP_STATE_CLOSED;
+ sp->ipcp.state = IPCP_STATE_CLOSED;
+ /* Give it a moment for the line to settle then go */
+ sppp_set_timeout (sp, 1);
+ }
+ sp->pp_link_state=SPPP_LINK_DOWN;
+ spin_unlock_irqrestore(&sp->lock, flags);
+
+ return 0;
+}
+
+EXPORT_SYMBOL(sppp_reopen);
+
+/**
+ * sppp_change_mtu - Change the link MTU
+ * @dev: Device to change MTU on
+ * @new_mtu: New MTU
+ *
+ * Change the MTU on the link. This can only be called with
+ * the link down. It returns an error if the link is up or
+ * the mtu is out of range.
+ */
+
+int sppp_change_mtu(struct net_device *dev, int new_mtu)
+{
+ if(new_mtu<128||new_mtu>PPP_MTU||(dev->flags&IFF_UP))
+ return -EINVAL;
+ dev->mtu=new_mtu;
+ return 0;
+}
+
+EXPORT_SYMBOL(sppp_change_mtu);
+
+/**
+ * sppp_do_ioctl - Ioctl handler for ppp/hdlc
+ * @dev: Device subject to ioctl
+ * @ifr: Interface request block from the user
+ * @cmd: Command that is being issued
+ *
+ * This function handles the ioctls that may be issued by the user
+ * to control the settings of a PPP/HDLC link. It does both busy
+ * and security checks. This function is intended to be wrapped by
+ * callers who wish to add additional ioctl calls of their own.
+ */
+
+int sppp_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+ struct sppp *sp = (struct sppp *)sppp_of(dev);
+
+ if(dev->flags&IFF_UP)
+ return -EBUSY;
+
+ if(!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ switch(cmd)
+ {
+ case SPPPIOCCISCO:
+ sp->pp_flags|=PP_CISCO;
+ dev->type = ARPHRD_HDLC;
+ break;
+ case SPPPIOCPPP:
+ sp->pp_flags&=~PP_CISCO;
+ dev->type = ARPHRD_PPP;
+ break;
+ case SPPPIOCDEBUG:
+ sp->pp_flags&=~PP_DEBUG;
+ if(ifr->ifr_flags)
+ sp->pp_flags|=PP_DEBUG;
+ break;
+ case SPPPIOCGFLAGS:
+ if(copy_to_user(ifr->ifr_data, &sp->pp_flags, sizeof(sp->pp_flags)))
+ return -EFAULT;
+ break;
+ case SPPPIOCSFLAGS:
+ if(copy_from_user(&sp->pp_flags, ifr->ifr_data, sizeof(sp->pp_flags)))
+ return -EFAULT;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+EXPORT_SYMBOL(sppp_do_ioctl);
+
+/**
+ * sppp_attach - attach synchronous PPP/HDLC to a device
+ * @pd: PPP device to initialise
+ *
+ * This initialises the PPP/HDLC support on an interface. At the
+ * time of calling the dev element must point to the network device
+ * that this interface is attached to. The interface should not yet
+ * be registered.
+ */
+
+void sppp_attach(struct ppp_device *pd)
+{
+ struct net_device *dev = pd->dev;
+ struct sppp *sp = &pd->sppp;
+ unsigned long flags;
+
+ /* Make sure embedding is safe for sppp_of */
+ BUG_ON(sppp_of(dev) != sp);
+
+ spin_lock_irqsave(&spppq_lock, flags);
+ /* Initialize keepalive handler. */
+ if (! spppq)
+ {
+ init_timer(&sppp_keepalive_timer);
+ sppp_keepalive_timer.expires=jiffies+10*HZ;
+ sppp_keepalive_timer.function=sppp_keepalive;
+ add_timer(&sppp_keepalive_timer);
+ }
+ /* Insert new entry into the keepalive list. */
+ sp->pp_next = spppq;
+ spppq = sp;
+ spin_unlock_irqrestore(&spppq_lock, flags);
+
+ sp->pp_loopcnt = 0;
+ sp->pp_alivecnt = 0;
+ sp->pp_seq = 0;
+ sp->pp_rseq = 0;
+ sp->pp_flags = PP_KEEPALIVE|PP_CISCO|debug;/*PP_DEBUG;*/
+ sp->lcp.magic = 0;
+ sp->lcp.state = LCP_STATE_CLOSED;
+ sp->ipcp.state = IPCP_STATE_CLOSED;
+ sp->pp_if = dev;
+ spin_lock_init(&sp->lock);
+
+ /*
+ * Device specific setup. All but interrupt handler and
+ * hard_start_xmit.
+ */
+
+ dev->hard_header = sppp_hard_header;
+ dev->rebuild_header = sppp_rebuild_header;
+ dev->tx_queue_len = 10;
+ dev->type = ARPHRD_HDLC;
+ dev->addr_len = 0;
+ dev->hard_header_len = sizeof(struct ppp_header);
+ dev->mtu = PPP_MTU;
+ /*
+ * These 4 are callers but MUST also call sppp_ functions
+ */
+ dev->do_ioctl = sppp_do_ioctl;
+#if 0
+ dev->get_stats = NULL; /* Let the driver override these */
+ dev->open = sppp_open;
+ dev->stop = sppp_close;
+#endif
+ dev->change_mtu = sppp_change_mtu;
+ dev->hard_header_cache = NULL;
+ dev->header_cache_update = NULL;
+ dev->flags = IFF_MULTICAST|IFF_POINTOPOINT|IFF_NOARP;
+}
+
+EXPORT_SYMBOL(sppp_attach);
+
+/**
+ * sppp_detach - release PPP resources from a device
+ * @dev: Network device to release
+ *
+ * Stop and free up any PPP/HDLC resources used by this
+ * interface. This must be called before the device is
+ * freed.
+ */
+
+void sppp_detach (struct net_device *dev)
+{
+ struct sppp **q, *p, *sp = (struct sppp *)sppp_of(dev);
+ unsigned long flags;
+
+ spin_lock_irqsave(&spppq_lock, flags);
+ /* Remove the entry from the keepalive list. */
+ for (q = &spppq; (p = *q); q = &p->pp_next)
+ if (p == sp) {
+ *q = p->pp_next;
+ break;
+ }
+
+ /* Stop keepalive handler. */
+ if (! spppq)
+ del_timer(&sppp_keepalive_timer);
+ sppp_clear_timeout (sp);
+ spin_unlock_irqrestore(&spppq_lock, flags);
+}
+
+EXPORT_SYMBOL(sppp_detach);
+
+/*
+ * Analyze the LCP Configure-Request options list
+ * for the presence of unknown options.
+ * If the request contains unknown options, build and
+ * send Configure-reject packet, containing only unknown options.
+ */
+static int
+sppp_lcp_conf_parse_options (struct sppp *sp, struct lcp_header *h,
+ int len, u32 *magic)
+{
+ u8 *buf, *r, *p;
+ int rlen;
+
+ len -= 4;
+ buf = r = kmalloc (len, GFP_ATOMIC);
+ if (! buf)
+ return (0);
+
+ p = (void*) (h+1);
+ for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
+ switch (*p) {
+ case LCP_OPT_MAGIC:
+ /* Magic number -- extract. */
+ if (len >= 6 && p[1] == 6) {
+ *magic = (u32)p[2] << 24 |
+ (u32)p[3] << 16 | p[4] << 8 | p[5];
+ continue;
+ }
+ break;
+ case LCP_OPT_ASYNC_MAP:
+ /* Async control character map -- check to be zero. */
+ if (len >= 6 && p[1] == 6 && ! p[2] && ! p[3] &&
+ ! p[4] && ! p[5])
+ continue;
+ break;
+ case LCP_OPT_MRU:
+ /* Maximum receive unit -- always OK. */
+ continue;
+ default:
+ /* Others not supported. */
+ break;
+ }
+ /* Add the option to rejected list. */
+ memcpy(r, p, p[1]);
+ r += p[1];
+ rlen += p[1];
+ }
+ if (rlen)
+ sppp_cp_send (sp, PPP_LCP, LCP_CONF_REJ, h->ident, rlen, buf);
+ kfree(buf);
+ return (rlen == 0);
+}
+
+static void sppp_ipcp_input (struct sppp *sp, struct sk_buff *skb)
+{
+ struct lcp_header *h;
+ struct net_device *dev = sp->pp_if;
+ int len = skb->len;
+
+ if (!pskb_may_pull(skb, sizeof(struct lcp_header))) {
+ if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_WARNING "%s: invalid ipcp packet length: %d bytes\n",
+ dev->name, len);
+ return;
+ }
+ h = (struct lcp_header *)skb->data;
+ skb_pull(skb,sizeof(struct lcp_header));
+ if (sp->pp_flags & PP_DEBUG) {
+ printk (KERN_WARNING "%s: ipcp input: %d bytes <%s id=%xh len=%xh",
+ dev->name, len,
+ sppp_ipcp_type_name (h->type), h->ident, ntohs (h->len));
+ if (len > 4)
+ sppp_print_bytes ((u8*) (h+1), len-4);
+ printk (">\n");
+ }
+ if (len > ntohs (h->len))
+ len = ntohs (h->len);
+ switch (h->type) {
+ default:
+ /* Unknown packet type -- send Code-Reject packet. */
+ sppp_cp_send (sp, PPP_IPCP, IPCP_CODE_REJ, ++sp->pp_seq, len, h);
+ break;
+ case IPCP_CONF_REQ:
+ if (len < 4) {
+ if (sp->pp_flags & PP_DEBUG)
+ printk (KERN_WARNING "%s: invalid ipcp configure request packet length: %d bytes\n",
+ dev->name, len);
+ return;
+ }
+ if (len > 4) {
+ sppp_cp_send (sp, PPP_IPCP, LCP_CONF_REJ, h->ident,
+ len-4, h+1);
+
+ switch (sp->ipcp.state) {
+ case IPCP_STATE_OPENED:
+ /* Initiate renegotiation. */
+ sppp_ipcp_open (sp);
+ /* fall through... */
+ case IPCP_STATE_ACK_SENT:
+ /* Go to closed state. */
+ sp->ipcp.state = IPCP_STATE_CLOSED;
+ }
+ } else {
+ /* Send Configure-Ack packet. */
+ sppp_cp_send (sp, PPP_IPCP, IPCP_CONF_ACK, h->ident,
+ 0, NULL);
+ /* Change the state. */
+ if (sp->ipcp.state == IPCP_STATE_ACK_RCVD)
+ sp->ipcp.state = IPCP_STATE_OPENED;
+ else
+ sp->ipcp.state = IPCP_STATE_ACK_SENT;
+ }
+ break;
+ case IPCP_CONF_ACK:
+ if (h->ident != sp->ipcp.confid)
+ break;
+ sppp_clear_timeout (sp);
+ switch (sp->ipcp.state) {
+ case IPCP_STATE_CLOSED:
+ sp->ipcp.state = IPCP_STATE_ACK_RCVD;
+ sppp_set_timeout (sp, 5);
+ break;
+ case IPCP_STATE_ACK_SENT:
+ sp->ipcp.state = IPCP_STATE_OPENED;
+ break;
+ }
+ break;
+ case IPCP_CONF_NAK:
+ case IPCP_CONF_REJ:
+ if (h->ident != sp->ipcp.confid)
+ break;
+ sppp_clear_timeout (sp);
+ /* Initiate renegotiation. */
+ sppp_ipcp_open (sp);
+ if (sp->ipcp.state != IPCP_STATE_ACK_SENT)
+ /* Go to closed state. */
+ sp->ipcp.state = IPCP_STATE_CLOSED;
+ break;
+ case IPCP_TERM_REQ:
+ /* Send Terminate-Ack packet. */
+ sppp_cp_send (sp, PPP_IPCP, IPCP_TERM_ACK, h->ident, 0, NULL);
+ /* Go to closed state. */
+ sp->ipcp.state = IPCP_STATE_CLOSED;
+ /* Initiate renegotiation. */
+ sppp_ipcp_open (sp);
+ break;
+ case IPCP_TERM_ACK:
+ /* Ignore for now. */
+ case IPCP_CODE_REJ:
+ /* Ignore for now. */
+ break;
+ }
+}
+
+static void sppp_lcp_open (struct sppp *sp)
+{
+ char opt[6];
+
+ if (! sp->lcp.magic)
+ sp->lcp.magic = jiffies;
+ opt[0] = LCP_OPT_MAGIC;
+ opt[1] = sizeof (opt);
+ opt[2] = sp->lcp.magic >> 24;
+ opt[3] = sp->lcp.magic >> 16;
+ opt[4] = sp->lcp.magic >> 8;
+ opt[5] = sp->lcp.magic;
+ sp->lcp.confid = ++sp->pp_seq;
+ sppp_cp_send (sp, PPP_LCP, LCP_CONF_REQ, sp->lcp.confid,
+ sizeof (opt), &opt);
+ sppp_set_timeout (sp, 2);
+}
+
+static void sppp_ipcp_open (struct sppp *sp)
+{
+ sp->ipcp.confid = ++sp->pp_seq;
+ sppp_cp_send (sp, PPP_IPCP, IPCP_CONF_REQ, sp->ipcp.confid, 0, NULL);
+ sppp_set_timeout (sp, 2);
+}
+
+/*
+ * Process PPP control protocol timeouts.
+ */
+
+static void sppp_cp_timeout (unsigned long arg)
+{
+ struct sppp *sp = (struct sppp*) arg;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sp->lock, flags);
+
+ sp->pp_flags &= ~PP_TIMO;
+ if (! (sp->pp_if->flags & IFF_UP) || (sp->pp_flags & PP_CISCO)) {
+ spin_unlock_irqrestore(&sp->lock, flags);
+ return;
+ }
+ switch (sp->lcp.state) {
+ case LCP_STATE_CLOSED:
+ /* No ACK for Configure-Request, retry. */
+ sppp_lcp_open (sp);
+ break;
+ case LCP_STATE_ACK_RCVD:
+ /* ACK got, but no Configure-Request for peer, retry. */
+ sppp_lcp_open (sp);
+ sp->lcp.state = LCP_STATE_CLOSED;
+ break;
+ case LCP_STATE_ACK_SENT:
+ /* ACK sent but no ACK for Configure-Request, retry. */
+ sppp_lcp_open (sp);
+ break;
+ case LCP_STATE_OPENED:
+ /* LCP is already OK, try IPCP. */
+ switch (sp->ipcp.state) {
+ case IPCP_STATE_CLOSED:
+ /* No ACK for Configure-Request, retry. */
+ sppp_ipcp_open (sp);
+ break;
+ case IPCP_STATE_ACK_RCVD:
+ /* ACK got, but no Configure-Request for peer, retry. */
+ sppp_ipcp_open (sp);
+ sp->ipcp.state = IPCP_STATE_CLOSED;
+ break;
+ case IPCP_STATE_ACK_SENT:
+ /* ACK sent but no ACK for Configure-Request, retry. */
+ sppp_ipcp_open (sp);
+ break;
+ case IPCP_STATE_OPENED:
+ /* IPCP is OK. */
+ break;
+ }
+ break;
+ }
+ spin_unlock_irqrestore(&sp->lock, flags);
+ sppp_flush_xmit();
+}
+
+static char *sppp_lcp_type_name (u8 type)
+{
+ static char buf [8];
+ switch (type) {
+ case LCP_CONF_REQ: return ("conf-req");
+ case LCP_CONF_ACK: return ("conf-ack");
+ case LCP_CONF_NAK: return ("conf-nack");
+ case LCP_CONF_REJ: return ("conf-rej");
+ case LCP_TERM_REQ: return ("term-req");
+ case LCP_TERM_ACK: return ("term-ack");
+ case LCP_CODE_REJ: return ("code-rej");
+ case LCP_PROTO_REJ: return ("proto-rej");
+ case LCP_ECHO_REQ: return ("echo-req");
+ case LCP_ECHO_REPLY: return ("echo-reply");
+ case LCP_DISC_REQ: return ("discard-req");
+ }
+ sprintf (buf, "%xh", type);
+ return (buf);
+}
+
+static char *sppp_ipcp_type_name (u8 type)
+{
+ static char buf [8];
+ switch (type) {
+ case IPCP_CONF_REQ: return ("conf-req");
+ case IPCP_CONF_ACK: return ("conf-ack");
+ case IPCP_CONF_NAK: return ("conf-nack");
+ case IPCP_CONF_REJ: return ("conf-rej");
+ case IPCP_TERM_REQ: return ("term-req");
+ case IPCP_TERM_ACK: return ("term-ack");
+ case IPCP_CODE_REJ: return ("code-rej");
+ }
+ sprintf (buf, "%xh", type);
+ return (buf);
+}
+
+static void sppp_print_bytes (u_char *p, u16 len)
+{
+ printk (" %x", *p++);
+ while (--len > 0)
+ printk ("-%x", *p++);
+}
+
+/**
+ * sppp_rcv - receive and process a WAN PPP frame
+ * @skb: The buffer to process
+ * @dev: The device it arrived on
+ * @p: Unused
+ *
+ * Protocol glue. This drives the deferred processing mode the poorer
+ * cards use. This can be called directly by cards that do not have
+ * timing constraints but is normally called from the network layer
+ * after interrupt servicing to process frames queued via netif_rx.
+ */
+
+static int sppp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *p)
+{
+ if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
+ return NET_RX_DROP;
+ sppp_input(dev,skb);
+ return 0;
+}
+
+struct packet_type sppp_packet_type = {
+ .type = __constant_htons(ETH_P_WAN_PPP),
+ .func = sppp_rcv,
+};
+
+static char banner[] __initdata =
+ KERN_INFO "Cronyx Ltd, Synchronous PPP and CISCO HDLC (c) 1994\n"
+ KERN_INFO "Linux port (c) 1998 Building Number Three Ltd & "
+ "Jan \"Yenya\" Kasprzak.\n";
+
+static int __init sync_ppp_init(void)
+{
+ if(debug)
+ debug=PP_DEBUG;
+ printk(banner);
+ skb_queue_head_init(&tx_queue);
+ dev_add_pack(&sppp_packet_type);
+ return 0;
+}
+
+
+static void __exit sync_ppp_cleanup(void)
+{
+ dev_remove_pack(&sppp_packet_type);
+}
+
+module_init(sync_ppp_init);
+module_exit(sync_ppp_cleanup);
+module_param(debug, int, 0);
+MODULE_LICENSE("GPL");
+