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@@ -1,1476 +0,0 @@
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-/*
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- * NET3: A (fairly minimal) implementation of synchronous PPP for Linux
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- * as well as a CISCO HDLC implementation. See the copyright
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- * message below for the original source.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the license, or (at your option) any later version.
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- *
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- * Note however. This code is also used in a different form by FreeBSD.
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- * Therefore when making any non OS specific change please consider
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- * contributing it back to the original author under the terms
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- * below in addition.
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- * -- Alan
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- *
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- * Port for Linux-2.1 by Jan "Yenya" Kasprzak <kas@fi.muni.cz>
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- */
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-
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-/*
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- * Synchronous PPP/Cisco link level subroutines.
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- * Keepalive protocol implemented in both Cisco and PPP modes.
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- *
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- * Copyright (C) 1994 Cronyx Ltd.
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- * Author: Serge Vakulenko, <vak@zebub.msk.su>
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- *
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- * This software is distributed with NO WARRANTIES, not even the implied
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- * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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- *
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- * Authors grant any other persons or organisations permission to use
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- * or modify this software as long as this message is kept with the software,
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- * all derivative works or modified versions.
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- *
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- * Version 1.9, Wed Oct 4 18:58:15 MSK 1995
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- *
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- * $Id: syncppp.c,v 1.18 2000/04/11 05:25:31 asj Exp $
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- */
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-#undef DEBUG
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-
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-#include <linux/module.h>
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-#include <linux/kernel.h>
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-#include <linux/errno.h>
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-#include <linux/init.h>
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-#include <linux/if_arp.h>
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-#include <linux/skbuff.h>
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-#include <linux/route.h>
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-#include <linux/netdevice.h>
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-#include <linux/inetdevice.h>
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-#include <linux/random.h>
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-#include <linux/pkt_sched.h>
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-#include <linux/spinlock.h>
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-#include <linux/rcupdate.h>
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-
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-#include <net/net_namespace.h>
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-#include <net/syncppp.h>
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-
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-#include <asm/byteorder.h>
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-#include <asm/uaccess.h>
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-
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-#define MAXALIVECNT 6 /* max. alive packets */
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-
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-#define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
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-#define PPP_UI 0x03 /* Unnumbered Information */
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-#define PPP_IP 0x0021 /* Internet Protocol */
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-#define PPP_ISO 0x0023 /* ISO OSI Protocol */
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-#define PPP_XNS 0x0025 /* Xerox NS Protocol */
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-#define PPP_IPX 0x002b /* Novell IPX Protocol */
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-#define PPP_LCP 0xc021 /* Link Control Protocol */
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-#define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */
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-
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-#define LCP_CONF_REQ 1 /* PPP LCP configure request */
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-#define LCP_CONF_ACK 2 /* PPP LCP configure acknowledge */
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-#define LCP_CONF_NAK 3 /* PPP LCP configure negative ack */
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-#define LCP_CONF_REJ 4 /* PPP LCP configure reject */
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-#define LCP_TERM_REQ 5 /* PPP LCP terminate request */
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-#define LCP_TERM_ACK 6 /* PPP LCP terminate acknowledge */
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-#define LCP_CODE_REJ 7 /* PPP LCP code reject */
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-#define LCP_PROTO_REJ 8 /* PPP LCP protocol reject */
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-#define LCP_ECHO_REQ 9 /* PPP LCP echo request */
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-#define LCP_ECHO_REPLY 10 /* PPP LCP echo reply */
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-#define LCP_DISC_REQ 11 /* PPP LCP discard request */
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-
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-#define LCP_OPT_MRU 1 /* maximum receive unit */
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-#define LCP_OPT_ASYNC_MAP 2 /* async control character map */
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-#define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */
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-#define LCP_OPT_QUAL_PROTO 4 /* quality protocol */
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-#define LCP_OPT_MAGIC 5 /* magic number */
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-#define LCP_OPT_RESERVED 6 /* reserved */
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-#define LCP_OPT_PROTO_COMP 7 /* protocol field compression */
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-#define LCP_OPT_ADDR_COMP 8 /* address/control field compression */
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-
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-#define IPCP_CONF_REQ LCP_CONF_REQ /* PPP IPCP configure request */
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-#define IPCP_CONF_ACK LCP_CONF_ACK /* PPP IPCP configure acknowledge */
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-#define IPCP_CONF_NAK LCP_CONF_NAK /* PPP IPCP configure negative ack */
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-#define IPCP_CONF_REJ LCP_CONF_REJ /* PPP IPCP configure reject */
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-#define IPCP_TERM_REQ LCP_TERM_REQ /* PPP IPCP terminate request */
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-#define IPCP_TERM_ACK LCP_TERM_ACK /* PPP IPCP terminate acknowledge */
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-#define IPCP_CODE_REJ LCP_CODE_REJ /* PPP IPCP code reject */
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-
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-#define CISCO_MULTICAST 0x8f /* Cisco multicast address */
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-#define CISCO_UNICAST 0x0f /* Cisco unicast address */
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-#define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
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-#define CISCO_ADDR_REQ 0 /* Cisco address request */
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-#define CISCO_ADDR_REPLY 1 /* Cisco address reply */
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-#define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
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-
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-struct ppp_header {
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- u8 address;
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- u8 control;
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- __be16 protocol;
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-};
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-#define PPP_HEADER_LEN sizeof (struct ppp_header)
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-
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-struct lcp_header {
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- u8 type;
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- u8 ident;
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- __be16 len;
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-};
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-#define LCP_HEADER_LEN sizeof (struct lcp_header)
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-
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-struct cisco_packet {
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- __be32 type;
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- __be32 par1;
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- __be32 par2;
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- __be16 rel;
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- __be16 time0;
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- __be16 time1;
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-};
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-#define CISCO_PACKET_LEN 18
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-#define CISCO_BIG_PACKET_LEN 20
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-
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-static struct sppp *spppq;
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-static struct timer_list sppp_keepalive_timer;
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-static DEFINE_SPINLOCK(spppq_lock);
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-
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-/* global xmit queue for sending packets while spinlock is held */
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-static struct sk_buff_head tx_queue;
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-
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-static void sppp_keepalive (unsigned long dummy);
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-static void sppp_cp_send (struct sppp *sp, u16 proto, u8 type,
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- u8 ident, u16 len, void *data);
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-static void sppp_cisco_send (struct sppp *sp, int type, u32 par1, u32 par2);
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-static void sppp_lcp_input (struct sppp *sp, struct sk_buff *m);
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-static void sppp_cisco_input (struct sppp *sp, struct sk_buff *m);
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-static void sppp_ipcp_input (struct sppp *sp, struct sk_buff *m);
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-static void sppp_lcp_open (struct sppp *sp);
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-static void sppp_ipcp_open (struct sppp *sp);
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-static int sppp_lcp_conf_parse_options (struct sppp *sp, struct lcp_header *h,
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- int len, u32 *magic);
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-static void sppp_cp_timeout (unsigned long arg);
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-static char *sppp_lcp_type_name (u8 type);
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-static char *sppp_ipcp_type_name (u8 type);
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-static void sppp_print_bytes (u8 *p, u16 len);
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-
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-static int debug;
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-
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-/* Flush global outgoing packet queue to dev_queue_xmit().
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- *
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- * dev_queue_xmit() must be called with interrupts enabled
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- * which means it can't be called with spinlocks held.
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- * If a packet needs to be sent while a spinlock is held,
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- * then put the packet into tx_queue, and call sppp_flush_xmit()
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- * after spinlock is released.
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- */
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-static void sppp_flush_xmit(void)
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-{
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- struct sk_buff *skb;
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- while ((skb = skb_dequeue(&tx_queue)) != NULL)
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- dev_queue_xmit(skb);
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-}
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-
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-/*
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- * Interface down stub
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- */
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-
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-static void if_down(struct net_device *dev)
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-{
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- struct sppp *sp = (struct sppp *)sppp_of(dev);
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-
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- sp->pp_link_state=SPPP_LINK_DOWN;
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-}
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-
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-/*
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- * Timeout routine activations.
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- */
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-
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-static void sppp_set_timeout(struct sppp *p,int s)
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-{
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- if (! (p->pp_flags & PP_TIMO))
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- {
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- init_timer(&p->pp_timer);
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- p->pp_timer.function=sppp_cp_timeout;
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- p->pp_timer.expires=jiffies+s*HZ;
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- p->pp_timer.data=(unsigned long)p;
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- p->pp_flags |= PP_TIMO;
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- add_timer(&p->pp_timer);
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- }
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-}
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-
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-static void sppp_clear_timeout(struct sppp *p)
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-{
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- if (p->pp_flags & PP_TIMO)
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- {
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- del_timer(&p->pp_timer);
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- p->pp_flags &= ~PP_TIMO;
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- }
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-}
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-
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-/**
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- * sppp_input - receive and process a WAN PPP frame
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- * @skb: The buffer to process
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- * @dev: The device it arrived on
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- *
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- * This can be called directly by cards that do not have
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- * timing constraints but is normally called from the network layer
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- * after interrupt servicing to process frames queued via netif_rx().
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- *
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- * We process the options in the card. If the frame is destined for
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- * the protocol stacks then it requeues the frame for the upper level
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- * protocol. If it is a control from it is processed and discarded
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- * here.
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- */
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-
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-static void sppp_input (struct net_device *dev, struct sk_buff *skb)
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-{
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- struct ppp_header *h;
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- struct sppp *sp = (struct sppp *)sppp_of(dev);
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- unsigned long flags;
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-
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- skb->dev=dev;
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- skb_reset_mac_header(skb);
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-
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- if (!pskb_may_pull(skb, PPP_HEADER_LEN)) {
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- /* Too small packet, drop it. */
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- if (sp->pp_flags & PP_DEBUG)
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- printk (KERN_DEBUG "%s: input packet is too small, %d bytes\n",
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- dev->name, skb->len);
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- kfree_skb(skb);
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- return;
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- }
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-
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- /* Get PPP header. */
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- h = (struct ppp_header *)skb->data;
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- skb_pull(skb,sizeof(struct ppp_header));
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-
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- spin_lock_irqsave(&sp->lock, flags);
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-
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- switch (h->address) {
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- default: /* Invalid PPP packet. */
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- goto invalid;
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- case PPP_ALLSTATIONS:
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- if (h->control != PPP_UI)
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- goto invalid;
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- if (sp->pp_flags & PP_CISCO) {
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- if (sp->pp_flags & PP_DEBUG)
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- printk (KERN_WARNING "%s: PPP packet in Cisco mode <0x%x 0x%x 0x%x>\n",
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- dev->name,
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- h->address, h->control, ntohs (h->protocol));
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- goto drop;
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- }
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- switch (ntohs (h->protocol)) {
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- default:
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- if (sp->lcp.state == LCP_STATE_OPENED)
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- sppp_cp_send (sp, PPP_LCP, LCP_PROTO_REJ,
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- ++sp->pp_seq, skb->len + 2,
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- &h->protocol);
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- if (sp->pp_flags & PP_DEBUG)
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- printk (KERN_WARNING "%s: invalid input protocol <0x%x 0x%x 0x%x>\n",
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- dev->name,
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- h->address, h->control, ntohs (h->protocol));
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- goto drop;
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- case PPP_LCP:
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- sppp_lcp_input (sp, skb);
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- goto drop;
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- case PPP_IPCP:
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- if (sp->lcp.state == LCP_STATE_OPENED)
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- sppp_ipcp_input (sp, skb);
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- else
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- printk(KERN_DEBUG "IPCP when still waiting LCP finish.\n");
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- goto drop;
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- case PPP_IP:
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- if (sp->ipcp.state == IPCP_STATE_OPENED) {
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- if(sp->pp_flags&PP_DEBUG)
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- printk(KERN_DEBUG "Yow an IP frame.\n");
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- skb->protocol=htons(ETH_P_IP);
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- netif_rx(skb);
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- goto done;
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- }
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- break;
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-#ifdef IPX
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- case PPP_IPX:
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- /* IPX IPXCP not implemented yet */
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- if (sp->lcp.state == LCP_STATE_OPENED) {
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- skb->protocol=htons(ETH_P_IPX);
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- netif_rx(skb);
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- goto done;
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- }
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- break;
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-#endif
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- }
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- break;
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- case CISCO_MULTICAST:
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- case CISCO_UNICAST:
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- /* Don't check the control field here (RFC 1547). */
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- if (! (sp->pp_flags & PP_CISCO)) {
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- if (sp->pp_flags & PP_DEBUG)
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- printk (KERN_WARNING "%s: Cisco packet in PPP mode <0x%x 0x%x 0x%x>\n",
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- dev->name,
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- h->address, h->control, ntohs (h->protocol));
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- goto drop;
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- }
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- switch (ntohs (h->protocol)) {
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- default:
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- goto invalid;
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- case CISCO_KEEPALIVE:
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- sppp_cisco_input (sp, skb);
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- goto drop;
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-#ifdef CONFIG_INET
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- case ETH_P_IP:
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- skb->protocol=htons(ETH_P_IP);
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- netif_rx(skb);
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- goto done;
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-#endif
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-#ifdef CONFIG_IPX
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- case ETH_P_IPX:
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- skb->protocol=htons(ETH_P_IPX);
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- netif_rx(skb);
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- goto done;
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-#endif
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- }
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- break;
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- }
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- goto drop;
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-
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-invalid:
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- if (sp->pp_flags & PP_DEBUG)
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- printk (KERN_WARNING "%s: invalid input packet <0x%x 0x%x 0x%x>\n",
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- dev->name, h->address, h->control, ntohs (h->protocol));
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-drop:
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- kfree_skb(skb);
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-done:
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- spin_unlock_irqrestore(&sp->lock, flags);
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- sppp_flush_xmit();
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- return;
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-}
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-
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-/*
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- * Handle transmit packets.
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- */
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-
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-static int sppp_hard_header(struct sk_buff *skb,
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- struct net_device *dev, __u16 type,
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- const void *daddr, const void *saddr,
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- unsigned int len)
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-{
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- struct sppp *sp = (struct sppp *)sppp_of(dev);
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- struct ppp_header *h;
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- skb_push(skb,sizeof(struct ppp_header));
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- h=(struct ppp_header *)skb->data;
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- if(sp->pp_flags&PP_CISCO)
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- {
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- h->address = CISCO_UNICAST;
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- h->control = 0;
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- }
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- else
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- {
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- h->address = PPP_ALLSTATIONS;
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- h->control = PPP_UI;
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- }
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- if(sp->pp_flags & PP_CISCO)
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- {
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- h->protocol = htons(type);
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- }
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- else switch(type)
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- {
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- case ETH_P_IP:
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- h->protocol = htons(PPP_IP);
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- break;
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- case ETH_P_IPX:
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- h->protocol = htons(PPP_IPX);
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- break;
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- }
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- return sizeof(struct ppp_header);
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-}
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-
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|
|
-static const struct header_ops sppp_header_ops = {
|
|
|
- .create = sppp_hard_header,
|
|
|
-};
|
|
|
-
|
|
|
-/*
|
|
|
- * 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) {
|
|
|
- __be32 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 = 0;
|
|
|
-
|
|
|
- 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 (*(__be32*)(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;
|
|
|
- }
|
|
|
- *(__be32 *)(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(*(__be32 *)(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 */
|
|
|
- {
|
|
|
- __be32 addr = 0, mask = htonl(~0U); /* FIXME: is the mask correct? */
|
|
|
-#ifdef CONFIG_INET
|
|
|
- struct in_device *in_dev;
|
|
|
- struct in_ifaddr *ifa;
|
|
|
-
|
|
|
- rcu_read_lock();
|
|
|
- if ((in_dev = __in_dev_get_rcu(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
|
|
|
- sppp_cisco_send (sp, CISCO_ADDR_REPLY, ntohl(addr), ntohl(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");
|
|
|
- }
|
|
|
- /* 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, u32 par1, u32 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 = htons(0xffff);
|
|
|
- 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);
|
|
|
- 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.
|
|
|
- */
|
|
|
-
|
|
|
-static 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;
|
|
|
-}
|
|
|
-
|
|
|
-/**
|
|
|
- * 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->header_ops = &sppp_header_ops;
|
|
|
-
|
|
|
- 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->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
|
|
|
- * @orig_dev: 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, struct net_device *orig_dev)
|
|
|
-{
|
|
|
- if (dev_net(dev) != &init_net) {
|
|
|
- kfree_skb(skb);
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
- if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
|
|
|
- return NET_RX_DROP;
|
|
|
- sppp_input(dev,skb);
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static 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");
|
|
|
-
|
David S. Miller