4225 lines
103 KiB
C
4225 lines
103 KiB
C
/*
|
||
* Synchronous PPP/Cisco link level subroutines.
|
||
* Keepalive protocol implemented in both Cisco and PPP modes.
|
||
*
|
||
* Copyright (C) 1994-1996 Cronyx Engineering Ltd.
|
||
* Author: Serge Vakulenko, <vak@cronyx.ru>
|
||
*
|
||
* Heavily revamped to conform to RFC 1661.
|
||
* Copyright (C) 1997, Joerg Wunsch.
|
||
*
|
||
* This software is distributed with NO WARRANTIES, not even the implied
|
||
* warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
||
*
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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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||
* From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997
|
||
*
|
||
* $Id: if_spppsubr.c,v 1.53 1999/02/19 13:45:09 phk Exp $
|
||
*/
|
||
|
||
#include <sys/param.h>
|
||
|
||
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
||
#include "opt_inet.h"
|
||
#include "opt_ipx.h"
|
||
#endif
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||
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#ifdef NetBSD1_3
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# if NetBSD1_3 > 6
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||
# include "opt_inet.h"
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# include "opt_iso.h"
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# endif
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||
#endif
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#include <sys/systm.h>
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||
#include <sys/kernel.h>
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||
#include <sys/sockio.h>
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||
#include <sys/socket.h>
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||
#include <sys/syslog.h>
|
||
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
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||
#include <machine/random.h>
|
||
#endif
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||
#include <sys/malloc.h>
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||
#include <sys/mbuf.h>
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||
|
||
#if defined (__OpenBSD__)
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||
#include <sys/md5k.h>
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||
#else
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||
#include <sys/md5.h>
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||
#endif
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||
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||
#include <net/if.h>
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||
#include <net/netisr.h>
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||
#include <net/if_types.h>
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||
#include <net/route.h>
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||
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||
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
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||
#include <machine/random.h>
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||
#endif
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||
#if defined (__NetBSD__) || defined (__OpenBSD__)
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||
#include <machine/cpu.h> /* XXX for softnet */
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||
#endif
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#include <machine/stdarg.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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||
# if defined (__FreeBSD__) || defined (__OpenBSD__)
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||
# include <netinet/if_ether.h>
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# else
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# include <net/ethertypes.h>
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# endif
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#else
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# error Huh? sppp without INET?
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#endif
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#ifdef IPX
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#include <netipx/ipx.h>
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#include <netipx/ipx_if.h>
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#endif
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#ifdef NS
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#include <netns/ns.h>
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#include <netns/ns_if.h>
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#endif
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#ifdef ISO
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#include <netiso/argo_debug.h>
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#include <netiso/iso.h>
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#include <netiso/iso_var.h>
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#include <netiso/iso_snpac.h>
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#endif
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#include <net/if_sppp.h>
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#if defined(__FreeBSD__) && __FreeBSD__ >= 3
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# define UNTIMEOUT(fun, arg, handle) untimeout(fun, arg, handle)
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# define TIMEOUT(fun, arg1, arg2, handle) handle = timeout(fun, arg1, arg2)
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# define IOCTL_CMD_T u_long
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#else
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# define UNTIMEOUT(fun, arg, handle) untimeout(fun, arg)
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# define TIMEOUT(fun, arg1, arg2, handle) timeout(fun, arg1, arg2)
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# define IOCTL_CMD_T int
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||
#endif
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#define MAXALIVECNT 3 /* max. alive packets */
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/*
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* Interface flags that can be set in an ifconfig command.
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*
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* Setting link0 will make the link passive, i.e. it will be marked
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* as being administrative openable, but won't be opened to begin
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* with. Incoming calls will be answered, or subsequent calls with
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* -link1 will cause the administrative open of the LCP layer.
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*
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* Setting link1 will cause the link to auto-dial only as packets
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* arrive to be sent.
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*
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* Setting IFF_DEBUG will syslog the option negotiation and state
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* transitions at level kern.debug. Note: all logs consistently look
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||
* like
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||
*
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* <if-name><unit>: <proto-name> <additional info...>
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*
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* with <if-name><unit> being something like "bppp0", and <proto-name>
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* being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
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*/
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#define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
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#define IFF_AUTO IFF_LINK1 /* auto-dial on output */
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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_PAP 0xc023 /* Password Authentication Protocol */
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#define PPP_CHAP 0xc223 /* Challenge-Handshake Auth Protocol */
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#define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */
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#define CONF_REQ 1 /* PPP configure request */
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#define CONF_ACK 2 /* PPP configure acknowledge */
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#define CONF_NAK 3 /* PPP configure negative ack */
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#define CONF_REJ 4 /* PPP configure reject */
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#define TERM_REQ 5 /* PPP terminate request */
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#define TERM_ACK 6 /* PPP terminate acknowledge */
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#define CODE_REJ 7 /* PPP code reject */
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#define PROTO_REJ 8 /* PPP protocol reject */
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#define ECHO_REQ 9 /* PPP echo request */
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#define ECHO_REPLY 10 /* PPP echo reply */
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#define DISC_REQ 11 /* PPP discard request */
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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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#define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */
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#define IPCP_OPT_COMPRESSION 2 /* IP compression protocol (VJ) */
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#define IPCP_OPT_ADDRESS 3 /* local IP address */
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||
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#define PAP_REQ 1 /* PAP name/password request */
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#define PAP_ACK 2 /* PAP acknowledge */
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#define PAP_NAK 3 /* PAP fail */
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||
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#define CHAP_CHALLENGE 1 /* CHAP challenge request */
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#define CHAP_RESPONSE 2 /* CHAP challenge response */
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#define CHAP_SUCCESS 3 /* CHAP response ok */
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#define CHAP_FAILURE 4 /* CHAP response failed */
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||
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#define CHAP_MD5 5 /* hash algorithm - MD5 */
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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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/* states are named and numbered according to RFC 1661 */
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#define STATE_INITIAL 0
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#define STATE_STARTING 1
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||
#define STATE_CLOSED 2
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#define STATE_STOPPED 3
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#define STATE_CLOSING 4
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#define STATE_STOPPING 5
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#define STATE_REQ_SENT 6
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#define STATE_ACK_RCVD 7
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||
#define STATE_ACK_SENT 8
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||
#define STATE_OPENED 9
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||
|
||
struct ppp_header {
|
||
u_char address;
|
||
u_char control;
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||
u_short protocol;
|
||
};
|
||
#define PPP_HEADER_LEN sizeof (struct ppp_header)
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||
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||
struct lcp_header {
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||
u_char type;
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u_char ident;
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u_short 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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u_long type;
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u_long par1;
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||
u_long par2;
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||
u_short rel;
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||
u_short time0;
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u_short time1;
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||
};
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||
#define CISCO_PACKET_LEN 18
|
||
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/*
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||
* We follow the spelling and capitalization of RFC 1661 here, to make
|
||
* it easier comparing with the standard. Please refer to this RFC in
|
||
* case you can't make sense out of these abbreviation; it will also
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||
* explain the semantics related to the various events and actions.
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||
*/
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struct cp {
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u_short proto; /* PPP control protocol number */
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u_char protoidx; /* index into state table in struct sppp */
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||
u_char flags;
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||
#define CP_LCP 0x01 /* this is the LCP */
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||
#define CP_AUTH 0x02 /* this is an authentication protocol */
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||
#define CP_NCP 0x04 /* this is a NCP */
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||
#define CP_QUAL 0x08 /* this is a quality reporting protocol */
|
||
const char *name; /* name of this control protocol */
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||
/* event handlers */
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||
void (*Up)(struct sppp *sp);
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||
void (*Down)(struct sppp *sp);
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void (*Open)(struct sppp *sp);
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void (*Close)(struct sppp *sp);
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void (*TO)(void *sp);
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int (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
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void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
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void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
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||
/* actions */
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||
void (*tlu)(struct sppp *sp);
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||
void (*tld)(struct sppp *sp);
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||
void (*tls)(struct sppp *sp);
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||
void (*tlf)(struct sppp *sp);
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||
void (*scr)(struct sppp *sp);
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||
};
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||
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static struct sppp *spppq;
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#if defined(__FreeBSD__) && __FreeBSD__ >= 3
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static struct callout_handle keepalive_ch;
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#endif
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||
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#if defined(__FreeBSD__) && __FreeBSD__ >= 3
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#define SPP_FMT "%s%d: "
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#define SPP_ARGS(ifp) (ifp)->if_name, (ifp)->if_unit
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#else
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#define SPP_FMT "%s: "
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#define SPP_ARGS(ifp) (ifp)->if_xname
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||
#endif
|
||
|
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/*
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* The following disgusting hack gets around the problem that IP TOS
|
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* can't be set yet. We want to put "interactive" traffic on a high
|
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* priority queue. To decide if traffic is interactive, we check that
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* a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
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||
*
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* XXX is this really still necessary? - joerg -
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||
*/
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static u_short interactive_ports[8] = {
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0, 513, 0, 0,
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0, 21, 0, 23,
|
||
};
|
||
#define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
|
||
|
||
/* almost every function needs these */
|
||
#define STDDCL \
|
||
struct ifnet *ifp = &sp->pp_if; \
|
||
int debug = ifp->if_flags & IFF_DEBUG
|
||
|
||
static int sppp_output(struct ifnet *ifp, struct mbuf *m,
|
||
struct sockaddr *dst, struct rtentry *rt);
|
||
|
||
static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2);
|
||
static void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
|
||
|
||
static void sppp_cp_input(const struct cp *cp, struct sppp *sp,
|
||
struct mbuf *m);
|
||
static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
|
||
u_char ident, u_short len, void *data);
|
||
/* static void sppp_cp_timeout(void *arg); */
|
||
static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
|
||
int newstate);
|
||
static void sppp_auth_send(const struct cp *cp,
|
||
struct sppp *sp, unsigned int type, unsigned int id,
|
||
...);
|
||
|
||
static void sppp_up_event(const struct cp *cp, struct sppp *sp);
|
||
static void sppp_down_event(const struct cp *cp, struct sppp *sp);
|
||
static void sppp_open_event(const struct cp *cp, struct sppp *sp);
|
||
static void sppp_close_event(const struct cp *cp, struct sppp *sp);
|
||
static void sppp_to_event(const struct cp *cp, struct sppp *sp);
|
||
|
||
static void sppp_null(struct sppp *sp);
|
||
|
||
static void sppp_lcp_init(struct sppp *sp);
|
||
static void sppp_lcp_up(struct sppp *sp);
|
||
static void sppp_lcp_down(struct sppp *sp);
|
||
static void sppp_lcp_open(struct sppp *sp);
|
||
static void sppp_lcp_close(struct sppp *sp);
|
||
static void sppp_lcp_TO(void *sp);
|
||
static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
|
||
static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
|
||
static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
|
||
static void sppp_lcp_tlu(struct sppp *sp);
|
||
static void sppp_lcp_tld(struct sppp *sp);
|
||
static void sppp_lcp_tls(struct sppp *sp);
|
||
static void sppp_lcp_tlf(struct sppp *sp);
|
||
static void sppp_lcp_scr(struct sppp *sp);
|
||
static void sppp_lcp_check_and_close(struct sppp *sp);
|
||
static int sppp_ncp_check(struct sppp *sp);
|
||
|
||
static void sppp_ipcp_init(struct sppp *sp);
|
||
static void sppp_ipcp_up(struct sppp *sp);
|
||
static void sppp_ipcp_down(struct sppp *sp);
|
||
static void sppp_ipcp_open(struct sppp *sp);
|
||
static void sppp_ipcp_close(struct sppp *sp);
|
||
static void sppp_ipcp_TO(void *sp);
|
||
static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
|
||
static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
|
||
static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
|
||
static void sppp_ipcp_tlu(struct sppp *sp);
|
||
static void sppp_ipcp_tld(struct sppp *sp);
|
||
static void sppp_ipcp_tls(struct sppp *sp);
|
||
static void sppp_ipcp_tlf(struct sppp *sp);
|
||
static void sppp_ipcp_scr(struct sppp *sp);
|
||
|
||
static void sppp_pap_input(struct sppp *sp, struct mbuf *m);
|
||
static void sppp_pap_init(struct sppp *sp);
|
||
static void sppp_pap_open(struct sppp *sp);
|
||
static void sppp_pap_close(struct sppp *sp);
|
||
static void sppp_pap_TO(void *sp);
|
||
static void sppp_pap_my_TO(void *sp);
|
||
static void sppp_pap_tlu(struct sppp *sp);
|
||
static void sppp_pap_tld(struct sppp *sp);
|
||
static void sppp_pap_scr(struct sppp *sp);
|
||
|
||
static void sppp_chap_input(struct sppp *sp, struct mbuf *m);
|
||
static void sppp_chap_init(struct sppp *sp);
|
||
static void sppp_chap_open(struct sppp *sp);
|
||
static void sppp_chap_close(struct sppp *sp);
|
||
static void sppp_chap_TO(void *sp);
|
||
static void sppp_chap_tlu(struct sppp *sp);
|
||
static void sppp_chap_tld(struct sppp *sp);
|
||
static void sppp_chap_scr(struct sppp *sp);
|
||
|
||
static const char *sppp_auth_type_name(u_short proto, u_char type);
|
||
static const char *sppp_cp_type_name(u_char type);
|
||
static const char *sppp_dotted_quad(u_long addr);
|
||
static const char *sppp_ipcp_opt_name(u_char opt);
|
||
static const char *sppp_lcp_opt_name(u_char opt);
|
||
static const char *sppp_phase_name(enum ppp_phase phase);
|
||
static const char *sppp_proto_name(u_short proto);
|
||
static const char *sppp_state_name(int state);
|
||
static int sppp_params(struct sppp *sp, u_long cmd, void *data);
|
||
static int sppp_strnlen(u_char *p, int max);
|
||
static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst,
|
||
u_long *srcmask);
|
||
static void sppp_keepalive(void *dummy);
|
||
static void sppp_phase_network(struct sppp *sp);
|
||
static void sppp_print_bytes(const u_char *p, u_short len);
|
||
static void sppp_print_string(const char *p, u_short len);
|
||
static void sppp_qflush(struct ifqueue *ifq);
|
||
static void sppp_set_ip_addr(struct sppp *sp, u_long src);
|
||
|
||
/* our control protocol descriptors */
|
||
static const struct cp lcp = {
|
||
PPP_LCP, IDX_LCP, CP_LCP, "lcp",
|
||
sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
|
||
sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
|
||
sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
|
||
sppp_lcp_scr
|
||
};
|
||
|
||
static const struct cp ipcp = {
|
||
PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp",
|
||
sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
|
||
sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
|
||
sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
|
||
sppp_ipcp_scr
|
||
};
|
||
|
||
static const struct cp pap = {
|
||
PPP_PAP, IDX_PAP, CP_AUTH, "pap",
|
||
sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
|
||
sppp_pap_TO, 0, 0, 0,
|
||
sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
|
||
sppp_pap_scr
|
||
};
|
||
|
||
static const struct cp chap = {
|
||
PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
|
||
sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
|
||
sppp_chap_TO, 0, 0, 0,
|
||
sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
|
||
sppp_chap_scr
|
||
};
|
||
|
||
static const struct cp *cps[IDX_COUNT] = {
|
||
&lcp, /* IDX_LCP */
|
||
&ipcp, /* IDX_IPCP */
|
||
&pap, /* IDX_PAP */
|
||
&chap, /* IDX_CHAP */
|
||
};
|
||
|
||
|
||
/*
|
||
* Exported functions, comprising our interface to the lower layer.
|
||
*/
|
||
|
||
/*
|
||
* Process the received packet.
|
||
*/
|
||
void
|
||
sppp_input(struct ifnet *ifp, struct mbuf *m)
|
||
{
|
||
struct ppp_header *h;
|
||
struct ifqueue *inq = 0;
|
||
int s;
|
||
struct sppp *sp = (struct sppp *)ifp;
|
||
int debug = ifp->if_flags & IFF_DEBUG;
|
||
|
||
if (ifp->if_flags & IFF_UP)
|
||
/* Count received bytes, add FCS and one flag */
|
||
ifp->if_ibytes += m->m_pkthdr.len + 3;
|
||
|
||
if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
|
||
/* Too small packet, drop it. */
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "input packet is too small, %d bytes\n",
|
||
SPP_ARGS(ifp), m->m_pkthdr.len);
|
||
drop:
|
||
++ifp->if_ierrors;
|
||
++ifp->if_iqdrops;
|
||
m_freem (m);
|
||
return;
|
||
}
|
||
|
||
/* Get PPP header. */
|
||
h = mtod (m, struct ppp_header*);
|
||
m_adj (m, PPP_HEADER_LEN);
|
||
|
||
switch (h->address) {
|
||
case PPP_ALLSTATIONS:
|
||
if (h->control != PPP_UI)
|
||
goto invalid;
|
||
if (sp->pp_flags & PP_CISCO) {
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "PPP packet in Cisco mode "
|
||
"<addr=0x%x ctrl=0x%x proto=0x%x>\n",
|
||
SPP_ARGS(ifp),
|
||
h->address, h->control, ntohs(h->protocol));
|
||
goto drop;
|
||
}
|
||
switch (ntohs (h->protocol)) {
|
||
default:
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "rejecting protocol "
|
||
"<addr=0x%x ctrl=0x%x proto=0x%x>\n",
|
||
SPP_ARGS(ifp),
|
||
h->address, h->control, ntohs(h->protocol));
|
||
if (sp->state[IDX_LCP] == STATE_OPENED)
|
||
sppp_cp_send (sp, PPP_LCP, PROTO_REJ,
|
||
++sp->pp_seq, m->m_pkthdr.len + 2,
|
||
&h->protocol);
|
||
++ifp->if_noproto;
|
||
goto drop;
|
||
case PPP_LCP:
|
||
sppp_cp_input(&lcp, sp, m);
|
||
m_freem (m);
|
||
return;
|
||
case PPP_PAP:
|
||
if (sp->pp_phase >= PHASE_AUTHENTICATE)
|
||
sppp_pap_input(sp, m);
|
||
m_freem (m);
|
||
return;
|
||
case PPP_CHAP:
|
||
if (sp->pp_phase >= PHASE_AUTHENTICATE)
|
||
sppp_chap_input(sp, m);
|
||
m_freem (m);
|
||
return;
|
||
#ifdef INET
|
||
case PPP_IPCP:
|
||
if (sp->pp_phase == PHASE_NETWORK)
|
||
sppp_cp_input(&ipcp, sp, m);
|
||
m_freem (m);
|
||
return;
|
||
case PPP_IP:
|
||
if (sp->state[IDX_IPCP] == STATE_OPENED) {
|
||
schednetisr (NETISR_IP);
|
||
inq = &ipintrq;
|
||
}
|
||
break;
|
||
#endif
|
||
#ifdef IPX
|
||
case PPP_IPX:
|
||
/* IPX IPXCP not implemented yet */
|
||
if (sp->pp_phase == PHASE_NETWORK) {
|
||
schednetisr (NETISR_IPX);
|
||
inq = &ipxintrq;
|
||
}
|
||
break;
|
||
#endif
|
||
#ifdef NS
|
||
case PPP_XNS:
|
||
/* XNS IDPCP not implemented yet */
|
||
if (sp->pp_phase == PHASE_NETWORK) {
|
||
schednetisr (NETISR_NS);
|
||
inq = &nsintrq;
|
||
}
|
||
break;
|
||
#endif
|
||
#ifdef ISO
|
||
case PPP_ISO:
|
||
/* OSI NLCP not implemented yet */
|
||
if (sp->pp_phase == PHASE_NETWORK) {
|
||
schednetisr (NETISR_ISO);
|
||
inq = &clnlintrq;
|
||
}
|
||
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 (debug)
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "Cisco packet in PPP mode "
|
||
"<addr=0x%x ctrl=0x%x proto=0x%x>\n",
|
||
SPP_ARGS(ifp),
|
||
h->address, h->control, ntohs(h->protocol));
|
||
goto drop;
|
||
}
|
||
switch (ntohs (h->protocol)) {
|
||
default:
|
||
++ifp->if_noproto;
|
||
goto invalid;
|
||
case CISCO_KEEPALIVE:
|
||
sppp_cisco_input ((struct sppp*) ifp, m);
|
||
m_freem (m);
|
||
return;
|
||
#ifdef INET
|
||
case ETHERTYPE_IP:
|
||
schednetisr (NETISR_IP);
|
||
inq = &ipintrq;
|
||
break;
|
||
#endif
|
||
#ifdef IPX
|
||
case ETHERTYPE_IPX:
|
||
schednetisr (NETISR_IPX);
|
||
inq = &ipxintrq;
|
||
break;
|
||
#endif
|
||
#ifdef NS
|
||
case ETHERTYPE_NS:
|
||
schednetisr (NETISR_NS);
|
||
inq = &nsintrq;
|
||
break;
|
||
#endif
|
||
}
|
||
break;
|
||
default: /* Invalid PPP packet. */
|
||
invalid:
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "invalid input packet "
|
||
"<addr=0x%x ctrl=0x%x proto=0x%x>\n",
|
||
SPP_ARGS(ifp),
|
||
h->address, h->control, ntohs(h->protocol));
|
||
goto drop;
|
||
}
|
||
|
||
if (! (ifp->if_flags & IFF_UP) || ! inq)
|
||
goto drop;
|
||
|
||
/* Check queue. */
|
||
s = splimp();
|
||
if (IF_QFULL (inq)) {
|
||
/* Queue overflow. */
|
||
IF_DROP(inq);
|
||
splx(s);
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n",
|
||
SPP_ARGS(ifp));
|
||
goto drop;
|
||
}
|
||
IF_ENQUEUE(inq, m);
|
||
splx(s);
|
||
}
|
||
|
||
/*
|
||
* Enqueue transmit packet.
|
||
*/
|
||
static int
|
||
sppp_output(struct ifnet *ifp, struct mbuf *m,
|
||
struct sockaddr *dst, struct rtentry *rt)
|
||
{
|
||
struct sppp *sp = (struct sppp*) ifp;
|
||
struct ppp_header *h;
|
||
struct ifqueue *ifq;
|
||
int s, rv = 0;
|
||
int debug = ifp->if_flags & IFF_DEBUG;
|
||
|
||
s = splimp();
|
||
|
||
if ((ifp->if_flags & IFF_UP) == 0 ||
|
||
(ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) {
|
||
m_freem (m);
|
||
splx (s);
|
||
return (ENETDOWN);
|
||
}
|
||
|
||
if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) {
|
||
/*
|
||
* Interface is not yet running, but auto-dial. Need
|
||
* to start LCP for it.
|
||
*/
|
||
ifp->if_flags |= IFF_RUNNING;
|
||
splx(s);
|
||
lcp.Open(sp);
|
||
s = splimp();
|
||
}
|
||
|
||
ifq = &ifp->if_snd;
|
||
#ifdef INET
|
||
if (dst->sa_family == AF_INET) {
|
||
/* XXX Check mbuf length here? */
|
||
struct ip *ip = mtod (m, struct ip*);
|
||
struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
|
||
|
||
/*
|
||
* When using dynamic local IP address assignment by using
|
||
* 0.0.0.0 as a local address, the first TCP session will
|
||
* not connect because the local TCP checksum is computed
|
||
* using 0.0.0.0 which will later become our real IP address
|
||
* so the TCP checksum computed at the remote end will
|
||
* become invalid. So we
|
||
* - don't let packets with src ip addr 0 thru
|
||
* - we flag TCP packets with src ip 0 as an error
|
||
*/
|
||
|
||
if(ip->ip_src.s_addr == INADDR_ANY) /* -hm */
|
||
{
|
||
m_freem(m);
|
||
splx(s);
|
||
if(ip->ip_p == IPPROTO_TCP)
|
||
return(EADDRNOTAVAIL);
|
||
else
|
||
return(0);
|
||
}
|
||
|
||
/*
|
||
* Put low delay, telnet, rlogin and ftp control packets
|
||
* in front of the queue.
|
||
*/
|
||
if (IF_QFULL (&sp->pp_fastq))
|
||
;
|
||
else if (ip->ip_tos & IPTOS_LOWDELAY)
|
||
ifq = &sp->pp_fastq;
|
||
else if (m->m_len < sizeof *ip + sizeof *tcp)
|
||
;
|
||
else if (ip->ip_p != IPPROTO_TCP)
|
||
;
|
||
else if (INTERACTIVE (ntohs (tcp->th_sport)))
|
||
ifq = &sp->pp_fastq;
|
||
else if (INTERACTIVE (ntohs (tcp->th_dport)))
|
||
ifq = &sp->pp_fastq;
|
||
}
|
||
#endif
|
||
|
||
/*
|
||
* Prepend general data packet PPP header. For now, IP only.
|
||
*/
|
||
M_PREPEND (m, PPP_HEADER_LEN, M_DONTWAIT);
|
||
if (! m) {
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n",
|
||
SPP_ARGS(ifp));
|
||
++ifp->if_oerrors;
|
||
splx (s);
|
||
return (ENOBUFS);
|
||
}
|
||
/*
|
||
* May want to check size of packet
|
||
* (albeit due to the implementation it's always enough)
|
||
*/
|
||
h = mtod (m, struct ppp_header*);
|
||
if (sp->pp_flags & PP_CISCO) {
|
||
h->address = CISCO_UNICAST; /* unicast address */
|
||
h->control = 0;
|
||
} else {
|
||
h->address = PPP_ALLSTATIONS; /* broadcast address */
|
||
h->control = PPP_UI; /* Unnumbered Info */
|
||
}
|
||
|
||
switch (dst->sa_family) {
|
||
#ifdef INET
|
||
case AF_INET: /* Internet Protocol */
|
||
if (sp->pp_flags & PP_CISCO)
|
||
h->protocol = htons (ETHERTYPE_IP);
|
||
else {
|
||
/*
|
||
* Don't choke with an ENETDOWN early. It's
|
||
* possible that we just started dialing out,
|
||
* so don't drop the packet immediately. If
|
||
* we notice that we run out of buffer space
|
||
* below, we will however remember that we are
|
||
* not ready to carry IP packets, and return
|
||
* ENETDOWN, as opposed to ENOBUFS.
|
||
*/
|
||
h->protocol = htons(PPP_IP);
|
||
if (sp->state[IDX_IPCP] != STATE_OPENED)
|
||
rv = ENETDOWN;
|
||
}
|
||
break;
|
||
#endif
|
||
#ifdef NS
|
||
case AF_NS: /* Xerox NS Protocol */
|
||
h->protocol = htons ((sp->pp_flags & PP_CISCO) ?
|
||
ETHERTYPE_NS : PPP_XNS);
|
||
break;
|
||
#endif
|
||
#ifdef IPX
|
||
case AF_IPX: /* Novell IPX Protocol */
|
||
h->protocol = htons ((sp->pp_flags & PP_CISCO) ?
|
||
ETHERTYPE_IPX : PPP_IPX);
|
||
break;
|
||
#endif
|
||
#ifdef ISO
|
||
case AF_ISO: /* ISO OSI Protocol */
|
||
if (sp->pp_flags & PP_CISCO)
|
||
goto nosupport;
|
||
h->protocol = htons (PPP_ISO);
|
||
break;
|
||
nosupport:
|
||
#endif
|
||
default:
|
||
m_freem (m);
|
||
++ifp->if_oerrors;
|
||
splx (s);
|
||
return (EAFNOSUPPORT);
|
||
}
|
||
|
||
/*
|
||
* Queue message on interface, and start output if interface
|
||
* not yet active.
|
||
*/
|
||
if (IF_QFULL (ifq)) {
|
||
IF_DROP (&ifp->if_snd);
|
||
m_freem (m);
|
||
++ifp->if_oerrors;
|
||
splx (s);
|
||
return (rv? rv: ENOBUFS);
|
||
}
|
||
IF_ENQUEUE (ifq, m);
|
||
if (! (ifp->if_flags & IFF_OACTIVE))
|
||
(*ifp->if_start) (ifp);
|
||
|
||
/*
|
||
* Count output packets and bytes.
|
||
* The packet length includes header, FCS and 1 flag,
|
||
* according to RFC 1333.
|
||
*/
|
||
ifp->if_obytes += m->m_pkthdr.len + 3;
|
||
splx (s);
|
||
return (0);
|
||
}
|
||
|
||
void
|
||
sppp_attach(struct ifnet *ifp)
|
||
{
|
||
struct sppp *sp = (struct sppp*) ifp;
|
||
|
||
/* Initialize keepalive handler. */
|
||
if (! spppq)
|
||
TIMEOUT(sppp_keepalive, 0, hz * 10, keepalive_ch);
|
||
|
||
/* Insert new entry into the keepalive list. */
|
||
sp->pp_next = spppq;
|
||
spppq = sp;
|
||
|
||
sp->pp_if.if_mtu = PP_MTU;
|
||
sp->pp_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
|
||
sp->pp_if.if_type = IFT_PPP;
|
||
sp->pp_if.if_output = sppp_output;
|
||
#if 0
|
||
sp->pp_flags = PP_KEEPALIVE;
|
||
#endif
|
||
sp->pp_fastq.ifq_maxlen = 32;
|
||
sp->pp_cpq.ifq_maxlen = 20;
|
||
sp->pp_loopcnt = 0;
|
||
sp->pp_alivecnt = 0;
|
||
sp->pp_seq = 0;
|
||
sp->pp_rseq = 0;
|
||
sp->pp_phase = PHASE_DEAD;
|
||
sp->pp_up = lcp.Up;
|
||
sp->pp_down = lcp.Down;
|
||
|
||
sppp_lcp_init(sp);
|
||
sppp_ipcp_init(sp);
|
||
sppp_pap_init(sp);
|
||
sppp_chap_init(sp);
|
||
}
|
||
|
||
void
|
||
sppp_detach(struct ifnet *ifp)
|
||
{
|
||
struct sppp **q, *p, *sp = (struct sppp*) ifp;
|
||
int i;
|
||
|
||
/* 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)
|
||
UNTIMEOUT(sppp_keepalive, 0, keepalive_ch);
|
||
|
||
for (i = 0; i < IDX_COUNT; i++)
|
||
UNTIMEOUT((cps[i])->TO, (void *)sp, sp->ch[i]);
|
||
UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch);
|
||
}
|
||
|
||
/*
|
||
* Flush the interface output queue.
|
||
*/
|
||
void
|
||
sppp_flush(struct ifnet *ifp)
|
||
{
|
||
struct sppp *sp = (struct sppp*) ifp;
|
||
|
||
sppp_qflush (&sp->pp_if.if_snd);
|
||
sppp_qflush (&sp->pp_fastq);
|
||
sppp_qflush (&sp->pp_cpq);
|
||
}
|
||
|
||
/*
|
||
* Check if the output queue is empty.
|
||
*/
|
||
int
|
||
sppp_isempty(struct ifnet *ifp)
|
||
{
|
||
struct sppp *sp = (struct sppp*) ifp;
|
||
int empty, s;
|
||
|
||
s = splimp();
|
||
empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head &&
|
||
!sp->pp_if.if_snd.ifq_head;
|
||
splx(s);
|
||
return (empty);
|
||
}
|
||
|
||
/*
|
||
* Get next packet to send.
|
||
*/
|
||
struct mbuf *
|
||
sppp_dequeue(struct ifnet *ifp)
|
||
{
|
||
struct sppp *sp = (struct sppp*) ifp;
|
||
struct mbuf *m;
|
||
int s;
|
||
|
||
s = splimp();
|
||
/*
|
||
* Process only the control protocol queue until we have at
|
||
* least one NCP open.
|
||
*
|
||
* Do always serve all three queues in Cisco mode.
|
||
*/
|
||
IF_DEQUEUE(&sp->pp_cpq, m);
|
||
if (m == NULL &&
|
||
(sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) {
|
||
IF_DEQUEUE(&sp->pp_fastq, m);
|
||
if (m == NULL)
|
||
IF_DEQUEUE (&sp->pp_if.if_snd, m);
|
||
}
|
||
splx(s);
|
||
return m;
|
||
}
|
||
|
||
/*
|
||
* Pick the next packet, do not remove it from the queue.
|
||
*/
|
||
struct mbuf *
|
||
sppp_pick(struct ifnet *ifp)
|
||
{
|
||
struct sppp *sp = (struct sppp*)ifp;
|
||
struct mbuf *m;
|
||
int s;
|
||
|
||
s= splimp ();
|
||
|
||
m = sp->pp_cpq.ifq_head;
|
||
if (m == NULL &&
|
||
(sp->pp_phase == PHASE_NETWORK ||
|
||
(sp->pp_flags & PP_CISCO) != 0))
|
||
if ((m = sp->pp_fastq.ifq_head) == NULL)
|
||
m = sp->pp_if.if_snd.ifq_head;
|
||
splx (s);
|
||
return (m);
|
||
}
|
||
|
||
/*
|
||
* Process an ioctl request. Called on low priority level.
|
||
*/
|
||
int
|
||
sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
|
||
{
|
||
struct ifreq *ifr = (struct ifreq*) data;
|
||
struct sppp *sp = (struct sppp*) ifp;
|
||
int s, rv, going_up, going_down, newmode;
|
||
|
||
s = splimp();
|
||
rv = 0;
|
||
switch (cmd) {
|
||
case SIOCAIFADDR:
|
||
case SIOCSIFDSTADDR:
|
||
break;
|
||
|
||
case SIOCSIFADDR:
|
||
if_up(ifp);
|
||
/* fall through... */
|
||
|
||
case SIOCSIFFLAGS:
|
||
going_up = ifp->if_flags & IFF_UP &&
|
||
(ifp->if_flags & IFF_RUNNING) == 0;
|
||
going_down = (ifp->if_flags & IFF_UP) == 0 &&
|
||
ifp->if_flags & IFF_RUNNING;
|
||
newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE);
|
||
if (newmode == (IFF_AUTO | IFF_PASSIVE)) {
|
||
/* sanity */
|
||
newmode = IFF_PASSIVE;
|
||
ifp->if_flags &= ~IFF_AUTO;
|
||
}
|
||
|
||
if (going_up || going_down)
|
||
lcp.Close(sp);
|
||
if (going_up && newmode == 0) {
|
||
/* neither auto-dial nor passive */
|
||
ifp->if_flags |= IFF_RUNNING;
|
||
if (!(sp->pp_flags & PP_CISCO))
|
||
lcp.Open(sp);
|
||
} else if (going_down) {
|
||
sppp_flush(ifp);
|
||
ifp->if_flags &= ~IFF_RUNNING;
|
||
}
|
||
|
||
break;
|
||
|
||
#ifdef SIOCSIFMTU
|
||
#ifndef ifr_mtu
|
||
#define ifr_mtu ifr_metric
|
||
#endif
|
||
case SIOCSIFMTU:
|
||
if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru)
|
||
return (EINVAL);
|
||
ifp->if_mtu = ifr->ifr_mtu;
|
||
break;
|
||
#endif
|
||
#ifdef SLIOCSETMTU
|
||
case SLIOCSETMTU:
|
||
if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru)
|
||
return (EINVAL);
|
||
ifp->if_mtu = *(short*)data;
|
||
break;
|
||
#endif
|
||
#ifdef SIOCGIFMTU
|
||
case SIOCGIFMTU:
|
||
ifr->ifr_mtu = ifp->if_mtu;
|
||
break;
|
||
#endif
|
||
#ifdef SLIOCGETMTU
|
||
case SLIOCGETMTU:
|
||
*(short*)data = ifp->if_mtu;
|
||
break;
|
||
#endif
|
||
case SIOCADDMULTI:
|
||
case SIOCDELMULTI:
|
||
break;
|
||
|
||
case SIOCGIFGENERIC:
|
||
case SIOCSIFGENERIC:
|
||
rv = sppp_params(sp, cmd, data);
|
||
break;
|
||
|
||
default:
|
||
rv = ENOTTY;
|
||
}
|
||
splx(s);
|
||
return rv;
|
||
}
|
||
|
||
|
||
/*
|
||
* Cisco framing implementation.
|
||
*/
|
||
|
||
/*
|
||
* Handle incoming Cisco keepalive protocol packets.
|
||
*/
|
||
static void
|
||
sppp_cisco_input(struct sppp *sp, struct mbuf *m)
|
||
{
|
||
STDDCL;
|
||
struct cisco_packet *h;
|
||
u_long me, mymask;
|
||
|
||
if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "cisco invalid packet length: %d bytes\n",
|
||
SPP_ARGS(ifp), m->m_pkthdr.len);
|
||
return;
|
||
}
|
||
h = mtod (m, struct cisco_packet*);
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "cisco input: %d bytes "
|
||
"<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
|
||
SPP_ARGS(ifp), m->m_pkthdr.len,
|
||
(u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel,
|
||
(u_int)h->time0, (u_int)h->time1);
|
||
switch (ntohl (h->type)) {
|
||
default:
|
||
if (debug)
|
||
addlog(SPP_FMT "cisco unknown packet type: 0x%lx\n",
|
||
SPP_ARGS(ifp), (u_long)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. */
|
||
if (sp->pp_loopcnt >= MAXALIVECNT) {
|
||
printf (SPP_FMT "loopback\n",
|
||
SPP_ARGS(ifp));
|
||
sp->pp_loopcnt = 0;
|
||
if (ifp->if_flags & IFF_UP) {
|
||
if_down (ifp);
|
||
sppp_qflush (&sp->pp_cpq);
|
||
}
|
||
}
|
||
++sp->pp_loopcnt;
|
||
|
||
/* Generate new local sequence number */
|
||
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
||
sp->pp_seq = random();
|
||
#else
|
||
sp->pp_seq ^= time.tv_sec ^ time.tv_usec;
|
||
#endif
|
||
break;
|
||
}
|
||
sp->pp_loopcnt = 0;
|
||
if (! (ifp->if_flags & IFF_UP) &&
|
||
(ifp->if_flags & IFF_RUNNING)) {
|
||
if_up(ifp);
|
||
printf (SPP_FMT "up\n", SPP_ARGS(ifp));
|
||
}
|
||
break;
|
||
case CISCO_ADDR_REQ:
|
||
sppp_get_ip_addrs(sp, &me, 0, &mymask);
|
||
if (me != 0L)
|
||
sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
|
||
break;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Send Cisco keepalive packet.
|
||
*/
|
||
static void
|
||
sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
|
||
{
|
||
STDDCL;
|
||
struct ppp_header *h;
|
||
struct cisco_packet *ch;
|
||
struct mbuf *m;
|
||
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
||
struct timeval tv;
|
||
#else
|
||
u_long t = (time.tv_sec - boottime.tv_sec) * 1000;
|
||
#endif
|
||
|
||
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
||
getmicrouptime(&tv);
|
||
#endif
|
||
|
||
MGETHDR (m, M_DONTWAIT, MT_DATA);
|
||
if (! m)
|
||
return;
|
||
m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
|
||
m->m_pkthdr.rcvif = 0;
|
||
|
||
h = mtod (m, struct ppp_header*);
|
||
h->address = CISCO_MULTICAST;
|
||
h->control = 0;
|
||
h->protocol = htons (CISCO_KEEPALIVE);
|
||
|
||
ch = (struct cisco_packet*) (h + 1);
|
||
ch->type = htonl (type);
|
||
ch->par1 = htonl (par1);
|
||
ch->par2 = htonl (par2);
|
||
ch->rel = -1;
|
||
|
||
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
||
ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
|
||
ch->time1 = htons ((u_short) tv.tv_sec);
|
||
#else
|
||
ch->time0 = htons ((u_short) (t >> 16));
|
||
ch->time1 = htons ((u_short) t);
|
||
#endif
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
|
||
SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1,
|
||
(u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
|
||
|
||
if (IF_QFULL (&sp->pp_cpq)) {
|
||
IF_DROP (&sp->pp_fastq);
|
||
IF_DROP (&ifp->if_snd);
|
||
m_freem (m);
|
||
} else
|
||
IF_ENQUEUE (&sp->pp_cpq, m);
|
||
if (! (ifp->if_flags & IFF_OACTIVE))
|
||
(*ifp->if_start) (ifp);
|
||
ifp->if_obytes += m->m_pkthdr.len + 3;
|
||
}
|
||
|
||
/*
|
||
* PPP protocol implementation.
|
||
*/
|
||
|
||
/*
|
||
* Send PPP control protocol packet.
|
||
*/
|
||
static void
|
||
sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
|
||
u_char ident, u_short len, void *data)
|
||
{
|
||
STDDCL;
|
||
struct ppp_header *h;
|
||
struct lcp_header *lh;
|
||
struct mbuf *m;
|
||
|
||
if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
|
||
len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
|
||
MGETHDR (m, M_DONTWAIT, MT_DATA);
|
||
if (! m)
|
||
return;
|
||
m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
|
||
m->m_pkthdr.rcvif = 0;
|
||
|
||
h = mtod (m, 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*) (h + 1);
|
||
lh->type = type;
|
||
lh->ident = ident;
|
||
lh->len = htons (LCP_HEADER_LEN + len);
|
||
if (len)
|
||
bcopy (data, lh+1, len);
|
||
|
||
if (debug) {
|
||
log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
|
||
SPP_ARGS(ifp),
|
||
sppp_proto_name(proto),
|
||
sppp_cp_type_name (lh->type), lh->ident,
|
||
ntohs (lh->len));
|
||
sppp_print_bytes ((u_char*) (lh+1), len);
|
||
addlog(">\n");
|
||
}
|
||
if (IF_QFULL (&sp->pp_cpq)) {
|
||
IF_DROP (&sp->pp_fastq);
|
||
IF_DROP (&ifp->if_snd);
|
||
m_freem (m);
|
||
++ifp->if_oerrors;
|
||
} else
|
||
IF_ENQUEUE (&sp->pp_cpq, m);
|
||
if (! (ifp->if_flags & IFF_OACTIVE))
|
||
(*ifp->if_start) (ifp);
|
||
ifp->if_obytes += m->m_pkthdr.len + 3;
|
||
}
|
||
|
||
/*
|
||
* Handle incoming PPP control protocol packets.
|
||
*/
|
||
static void
|
||
sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
|
||
{
|
||
STDDCL;
|
||
struct lcp_header *h;
|
||
int len = m->m_pkthdr.len;
|
||
int rv;
|
||
u_char *p;
|
||
|
||
if (len < 4) {
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "%s invalid packet length: %d bytes\n",
|
||
SPP_ARGS(ifp), cp->name, len);
|
||
return;
|
||
}
|
||
h = mtod (m, struct lcp_header*);
|
||
if (debug) {
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
|
||
SPP_ARGS(ifp), cp->name,
|
||
sppp_state_name(sp->state[cp->protoidx]),
|
||
sppp_cp_type_name (h->type), h->ident, ntohs (h->len));
|
||
sppp_print_bytes ((u_char*) (h+1), len-4);
|
||
addlog(">\n");
|
||
}
|
||
if (len > ntohs (h->len))
|
||
len = ntohs (h->len);
|
||
p = (u_char *)(h + 1);
|
||
switch (h->type) {
|
||
case CONF_REQ:
|
||
if (len < 4) {
|
||
if (debug)
|
||
addlog(SPP_FMT "%s invalid conf-req length %d\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
len);
|
||
++ifp->if_ierrors;
|
||
break;
|
||
}
|
||
/* handle states where RCR doesn't get a SCA/SCN */
|
||
switch (sp->state[cp->protoidx]) {
|
||
case STATE_CLOSING:
|
||
case STATE_STOPPING:
|
||
return;
|
||
case STATE_CLOSED:
|
||
sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
|
||
0, 0);
|
||
return;
|
||
}
|
||
rv = (cp->RCR)(sp, h, len);
|
||
switch (sp->state[cp->protoidx]) {
|
||
case STATE_OPENED:
|
||
(cp->tld)(sp);
|
||
(cp->scr)(sp);
|
||
/* fall through... */
|
||
case STATE_ACK_SENT:
|
||
case STATE_REQ_SENT:
|
||
sppp_cp_change_state(cp, sp, rv?
|
||
STATE_ACK_SENT: STATE_REQ_SENT);
|
||
break;
|
||
case STATE_STOPPED:
|
||
sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
|
||
(cp->scr)(sp);
|
||
sppp_cp_change_state(cp, sp, rv?
|
||
STATE_ACK_SENT: STATE_REQ_SENT);
|
||
break;
|
||
case STATE_ACK_RCVD:
|
||
if (rv) {
|
||
sppp_cp_change_state(cp, sp, STATE_OPENED);
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "%s tlu\n",
|
||
SPP_ARGS(ifp),
|
||
cp->name);
|
||
(cp->tlu)(sp);
|
||
} else
|
||
sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
|
||
break;
|
||
default:
|
||
printf(SPP_FMT "%s illegal %s in state %s\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
sppp_cp_type_name(h->type),
|
||
sppp_state_name(sp->state[cp->protoidx]));
|
||
++ifp->if_ierrors;
|
||
}
|
||
break;
|
||
case CONF_ACK:
|
||
if (h->ident != sp->confid[cp->protoidx]) {
|
||
if (debug)
|
||
addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
h->ident, sp->confid[cp->protoidx]);
|
||
++ifp->if_ierrors;
|
||
break;
|
||
}
|
||
switch (sp->state[cp->protoidx]) {
|
||
case STATE_CLOSED:
|
||
case STATE_STOPPED:
|
||
sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
|
||
break;
|
||
case STATE_CLOSING:
|
||
case STATE_STOPPING:
|
||
break;
|
||
case STATE_REQ_SENT:
|
||
sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
|
||
sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
|
||
break;
|
||
case STATE_OPENED:
|
||
(cp->tld)(sp);
|
||
/* fall through */
|
||
case STATE_ACK_RCVD:
|
||
(cp->scr)(sp);
|
||
sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
|
||
break;
|
||
case STATE_ACK_SENT:
|
||
sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
|
||
sppp_cp_change_state(cp, sp, STATE_OPENED);
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "%s tlu\n",
|
||
SPP_ARGS(ifp), cp->name);
|
||
(cp->tlu)(sp);
|
||
break;
|
||
default:
|
||
printf(SPP_FMT "%s illegal %s in state %s\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
sppp_cp_type_name(h->type),
|
||
sppp_state_name(sp->state[cp->protoidx]));
|
||
++ifp->if_ierrors;
|
||
}
|
||
break;
|
||
case CONF_NAK:
|
||
case CONF_REJ:
|
||
if (h->ident != sp->confid[cp->protoidx]) {
|
||
if (debug)
|
||
addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
h->ident, sp->confid[cp->protoidx]);
|
||
++ifp->if_ierrors;
|
||
break;
|
||
}
|
||
if (h->type == CONF_NAK)
|
||
(cp->RCN_nak)(sp, h, len);
|
||
else /* CONF_REJ */
|
||
(cp->RCN_rej)(sp, h, len);
|
||
|
||
switch (sp->state[cp->protoidx]) {
|
||
case STATE_CLOSED:
|
||
case STATE_STOPPED:
|
||
sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
|
||
break;
|
||
case STATE_REQ_SENT:
|
||
case STATE_ACK_SENT:
|
||
sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
|
||
(cp->scr)(sp);
|
||
break;
|
||
case STATE_OPENED:
|
||
(cp->tld)(sp);
|
||
/* fall through */
|
||
case STATE_ACK_RCVD:
|
||
sppp_cp_change_state(cp, sp, STATE_ACK_SENT);
|
||
(cp->scr)(sp);
|
||
break;
|
||
case STATE_CLOSING:
|
||
case STATE_STOPPING:
|
||
break;
|
||
default:
|
||
printf(SPP_FMT "%s illegal %s in state %s\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
sppp_cp_type_name(h->type),
|
||
sppp_state_name(sp->state[cp->protoidx]));
|
||
++ifp->if_ierrors;
|
||
}
|
||
break;
|
||
|
||
case TERM_REQ:
|
||
switch (sp->state[cp->protoidx]) {
|
||
case STATE_ACK_RCVD:
|
||
case STATE_ACK_SENT:
|
||
sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
|
||
/* fall through */
|
||
case STATE_CLOSED:
|
||
case STATE_STOPPED:
|
||
case STATE_CLOSING:
|
||
case STATE_STOPPING:
|
||
case STATE_REQ_SENT:
|
||
sta:
|
||
/* Send Terminate-Ack packet. */
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
|
||
SPP_ARGS(ifp), cp->name);
|
||
sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
|
||
break;
|
||
case STATE_OPENED:
|
||
(cp->tld)(sp);
|
||
sp->rst_counter[cp->protoidx] = 0;
|
||
sppp_cp_change_state(cp, sp, STATE_STOPPING);
|
||
goto sta;
|
||
break;
|
||
default:
|
||
printf(SPP_FMT "%s illegal %s in state %s\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
sppp_cp_type_name(h->type),
|
||
sppp_state_name(sp->state[cp->protoidx]));
|
||
++ifp->if_ierrors;
|
||
}
|
||
break;
|
||
case TERM_ACK:
|
||
switch (sp->state[cp->protoidx]) {
|
||
case STATE_CLOSED:
|
||
case STATE_STOPPED:
|
||
case STATE_REQ_SENT:
|
||
case STATE_ACK_SENT:
|
||
break;
|
||
case STATE_CLOSING:
|
||
sppp_cp_change_state(cp, sp, STATE_CLOSED);
|
||
(cp->tlf)(sp);
|
||
break;
|
||
case STATE_STOPPING:
|
||
sppp_cp_change_state(cp, sp, STATE_STOPPED);
|
||
(cp->tlf)(sp);
|
||
break;
|
||
case STATE_ACK_RCVD:
|
||
sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
|
||
break;
|
||
case STATE_OPENED:
|
||
(cp->tld)(sp);
|
||
(cp->scr)(sp);
|
||
sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
|
||
break;
|
||
default:
|
||
printf(SPP_FMT "%s illegal %s in state %s\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
sppp_cp_type_name(h->type),
|
||
sppp_state_name(sp->state[cp->protoidx]));
|
||
++ifp->if_ierrors;
|
||
}
|
||
break;
|
||
case CODE_REJ:
|
||
case PROTO_REJ:
|
||
/* XXX catastrophic rejects (RXJ-) aren't handled yet. */
|
||
log(LOG_INFO,
|
||
SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
|
||
"danger will robinson\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
|
||
switch (sp->state[cp->protoidx]) {
|
||
case STATE_CLOSED:
|
||
case STATE_STOPPED:
|
||
case STATE_REQ_SENT:
|
||
case STATE_ACK_SENT:
|
||
case STATE_CLOSING:
|
||
case STATE_STOPPING:
|
||
case STATE_OPENED:
|
||
break;
|
||
case STATE_ACK_RCVD:
|
||
sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
|
||
break;
|
||
default:
|
||
printf(SPP_FMT "%s illegal %s in state %s\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
sppp_cp_type_name(h->type),
|
||
sppp_state_name(sp->state[cp->protoidx]));
|
||
++ifp->if_ierrors;
|
||
}
|
||
break;
|
||
case DISC_REQ:
|
||
if (cp->proto != PPP_LCP)
|
||
goto illegal;
|
||
/* Discard the packet. */
|
||
break;
|
||
case ECHO_REQ:
|
||
if (cp->proto != PPP_LCP)
|
||
goto illegal;
|
||
if (sp->state[cp->protoidx] != STATE_OPENED) {
|
||
if (debug)
|
||
addlog(SPP_FMT "lcp echo req but lcp closed\n",
|
||
SPP_ARGS(ifp));
|
||
++ifp->if_ierrors;
|
||
break;
|
||
}
|
||
if (len < 8) {
|
||
if (debug)
|
||
addlog(SPP_FMT "invalid lcp echo request "
|
||
"packet length: %d bytes\n",
|
||
SPP_ARGS(ifp), len);
|
||
break;
|
||
}
|
||
if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
|
||
ntohl (*(long*)(h+1)) == sp->lcp.magic) {
|
||
/* Line loopback mode detected. */
|
||
printf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
|
||
if_down (ifp);
|
||
sppp_qflush (&sp->pp_cpq);
|
||
|
||
/* Shut down the PPP link. */
|
||
/* XXX */
|
||
lcp.Down(sp);
|
||
lcp.Up(sp);
|
||
break;
|
||
}
|
||
*(long*)(h+1) = htonl (sp->lcp.magic);
|
||
if (debug)
|
||
addlog(SPP_FMT "got lcp echo req, sending echo rep\n",
|
||
SPP_ARGS(ifp));
|
||
sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
|
||
break;
|
||
case ECHO_REPLY:
|
||
if (cp->proto != PPP_LCP)
|
||
goto illegal;
|
||
if (h->ident != sp->lcp.echoid) {
|
||
++ifp->if_ierrors;
|
||
break;
|
||
}
|
||
if (len < 8) {
|
||
if (debug)
|
||
addlog(SPP_FMT "lcp invalid echo reply "
|
||
"packet length: %d bytes\n",
|
||
SPP_ARGS(ifp), len);
|
||
break;
|
||
}
|
||
if (debug)
|
||
addlog(SPP_FMT "lcp got echo rep\n",
|
||
SPP_ARGS(ifp));
|
||
if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) ||
|
||
ntohl (*(long*)(h+1)) != sp->lcp.magic)
|
||
sp->pp_alivecnt = 0;
|
||
break;
|
||
default:
|
||
/* Unknown packet type -- send Code-Reject packet. */
|
||
illegal:
|
||
if (debug)
|
||
addlog(SPP_FMT "%s send code-rej for 0x%x\n",
|
||
SPP_ARGS(ifp), cp->name, h->type);
|
||
sppp_cp_send(sp, cp->proto, CODE_REJ, ++sp->pp_seq,
|
||
m->m_pkthdr.len, h);
|
||
++ifp->if_ierrors;
|
||
}
|
||
}
|
||
|
||
|
||
/*
|
||
* The generic part of all Up/Down/Open/Close/TO event handlers.
|
||
* Basically, the state transition handling in the automaton.
|
||
*/
|
||
static void
|
||
sppp_up_event(const struct cp *cp, struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
sppp_state_name(sp->state[cp->protoidx]));
|
||
|
||
switch (sp->state[cp->protoidx]) {
|
||
case STATE_INITIAL:
|
||
sppp_cp_change_state(cp, sp, STATE_CLOSED);
|
||
break;
|
||
case STATE_STARTING:
|
||
sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
|
||
(cp->scr)(sp);
|
||
sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
|
||
break;
|
||
default:
|
||
printf(SPP_FMT "%s illegal up in state %s\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
sppp_state_name(sp->state[cp->protoidx]));
|
||
}
|
||
}
|
||
|
||
static void
|
||
sppp_down_event(const struct cp *cp, struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
sppp_state_name(sp->state[cp->protoidx]));
|
||
|
||
switch (sp->state[cp->protoidx]) {
|
||
case STATE_CLOSED:
|
||
case STATE_CLOSING:
|
||
sppp_cp_change_state(cp, sp, STATE_INITIAL);
|
||
break;
|
||
case STATE_STOPPED:
|
||
sppp_cp_change_state(cp, sp, STATE_STARTING);
|
||
(cp->tls)(sp);
|
||
break;
|
||
case STATE_STOPPING:
|
||
case STATE_REQ_SENT:
|
||
case STATE_ACK_RCVD:
|
||
case STATE_ACK_SENT:
|
||
sppp_cp_change_state(cp, sp, STATE_STARTING);
|
||
break;
|
||
case STATE_OPENED:
|
||
(cp->tld)(sp);
|
||
sppp_cp_change_state(cp, sp, STATE_STARTING);
|
||
break;
|
||
default:
|
||
printf(SPP_FMT "%s illegal down in state %s\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
sppp_state_name(sp->state[cp->protoidx]));
|
||
}
|
||
}
|
||
|
||
|
||
static void
|
||
sppp_open_event(const struct cp *cp, struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
sppp_state_name(sp->state[cp->protoidx]));
|
||
|
||
switch (sp->state[cp->protoidx]) {
|
||
case STATE_INITIAL:
|
||
sppp_cp_change_state(cp, sp, STATE_STARTING);
|
||
(cp->tls)(sp);
|
||
break;
|
||
case STATE_STARTING:
|
||
break;
|
||
case STATE_CLOSED:
|
||
sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
|
||
(cp->scr)(sp);
|
||
sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
|
||
break;
|
||
case STATE_STOPPED:
|
||
case STATE_STOPPING:
|
||
case STATE_REQ_SENT:
|
||
case STATE_ACK_RCVD:
|
||
case STATE_ACK_SENT:
|
||
case STATE_OPENED:
|
||
break;
|
||
case STATE_CLOSING:
|
||
sppp_cp_change_state(cp, sp, STATE_STOPPING);
|
||
break;
|
||
}
|
||
}
|
||
|
||
|
||
static void
|
||
sppp_close_event(const struct cp *cp, struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
sppp_state_name(sp->state[cp->protoidx]));
|
||
|
||
switch (sp->state[cp->protoidx]) {
|
||
case STATE_INITIAL:
|
||
case STATE_CLOSED:
|
||
case STATE_CLOSING:
|
||
break;
|
||
case STATE_STARTING:
|
||
sppp_cp_change_state(cp, sp, STATE_INITIAL);
|
||
(cp->tlf)(sp);
|
||
break;
|
||
case STATE_STOPPED:
|
||
sppp_cp_change_state(cp, sp, STATE_CLOSED);
|
||
break;
|
||
case STATE_STOPPING:
|
||
sppp_cp_change_state(cp, sp, STATE_CLOSING);
|
||
break;
|
||
case STATE_OPENED:
|
||
(cp->tld)(sp);
|
||
/* fall through */
|
||
case STATE_REQ_SENT:
|
||
case STATE_ACK_RCVD:
|
||
case STATE_ACK_SENT:
|
||
sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
|
||
sppp_cp_send(sp, cp->proto, TERM_REQ, ++sp->pp_seq, 0, 0);
|
||
sppp_cp_change_state(cp, sp, STATE_CLOSING);
|
||
break;
|
||
}
|
||
}
|
||
|
||
static void
|
||
sppp_to_event(const struct cp *cp, struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
int s;
|
||
|
||
s = splimp();
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
|
||
SPP_ARGS(ifp), cp->name,
|
||
sppp_state_name(sp->state[cp->protoidx]),
|
||
sp->rst_counter[cp->protoidx]);
|
||
|
||
if (--sp->rst_counter[cp->protoidx] < 0)
|
||
/* TO- event */
|
||
switch (sp->state[cp->protoidx]) {
|
||
case STATE_CLOSING:
|
||
sppp_cp_change_state(cp, sp, STATE_CLOSED);
|
||
(cp->tlf)(sp);
|
||
break;
|
||
case STATE_STOPPING:
|
||
sppp_cp_change_state(cp, sp, STATE_STOPPED);
|
||
(cp->tlf)(sp);
|
||
break;
|
||
case STATE_REQ_SENT:
|
||
case STATE_ACK_RCVD:
|
||
case STATE_ACK_SENT:
|
||
sppp_cp_change_state(cp, sp, STATE_STOPPED);
|
||
(cp->tlf)(sp);
|
||
break;
|
||
}
|
||
else
|
||
/* TO+ event */
|
||
switch (sp->state[cp->protoidx]) {
|
||
case STATE_CLOSING:
|
||
case STATE_STOPPING:
|
||
sppp_cp_send(sp, cp->proto, TERM_REQ, ++sp->pp_seq,
|
||
0, 0);
|
||
TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout,
|
||
sp->ch[cp->protoidx]);
|
||
break;
|
||
case STATE_REQ_SENT:
|
||
case STATE_ACK_RCVD:
|
||
(cp->scr)(sp);
|
||
/* sppp_cp_change_state() will restart the timer */
|
||
sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
|
||
break;
|
||
case STATE_ACK_SENT:
|
||
(cp->scr)(sp);
|
||
TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout,
|
||
sp->ch[cp->protoidx]);
|
||
break;
|
||
}
|
||
|
||
splx(s);
|
||
}
|
||
|
||
/*
|
||
* Change the state of a control protocol in the state automaton.
|
||
* Takes care of starting/stopping the restart timer.
|
||
*/
|
||
void
|
||
sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
|
||
{
|
||
sp->state[cp->protoidx] = newstate;
|
||
|
||
UNTIMEOUT(cp->TO, (void *)sp, sp->ch[cp->protoidx]);
|
||
switch (newstate) {
|
||
case STATE_INITIAL:
|
||
case STATE_STARTING:
|
||
case STATE_CLOSED:
|
||
case STATE_STOPPED:
|
||
case STATE_OPENED:
|
||
break;
|
||
case STATE_CLOSING:
|
||
case STATE_STOPPING:
|
||
case STATE_REQ_SENT:
|
||
case STATE_ACK_RCVD:
|
||
case STATE_ACK_SENT:
|
||
TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout,
|
||
sp->ch[cp->protoidx]);
|
||
break;
|
||
}
|
||
}
|
||
/*
|
||
*--------------------------------------------------------------------------*
|
||
* *
|
||
* The LCP implementation. *
|
||
* *
|
||
*--------------------------------------------------------------------------*
|
||
*/
|
||
static void
|
||
sppp_lcp_init(struct sppp *sp)
|
||
{
|
||
sp->lcp.opts = (1 << LCP_OPT_MAGIC);
|
||
sp->lcp.magic = 0;
|
||
sp->state[IDX_LCP] = STATE_INITIAL;
|
||
sp->fail_counter[IDX_LCP] = 0;
|
||
sp->lcp.protos = 0;
|
||
sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
|
||
|
||
/* Note that these values are relevant for all control protocols */
|
||
sp->lcp.timeout = 3 * hz;
|
||
sp->lcp.max_terminate = 2;
|
||
sp->lcp.max_configure = 10;
|
||
sp->lcp.max_failure = 10;
|
||
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
||
callout_handle_init(&sp->ch[IDX_LCP]);
|
||
#endif
|
||
}
|
||
|
||
static void
|
||
sppp_lcp_up(struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
|
||
/*
|
||
* If this interface is passive or dial-on-demand, and we are
|
||
* still in Initial state, it means we've got an incoming
|
||
* call. Activate the interface.
|
||
*/
|
||
if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "Up event", SPP_ARGS(ifp));
|
||
ifp->if_flags |= IFF_RUNNING;
|
||
if (sp->state[IDX_LCP] == STATE_INITIAL) {
|
||
if (debug)
|
||
addlog("(incoming call)\n");
|
||
sp->pp_flags |= PP_CALLIN;
|
||
lcp.Open(sp);
|
||
} else if (debug)
|
||
addlog("\n");
|
||
}
|
||
|
||
sppp_up_event(&lcp, sp);
|
||
}
|
||
|
||
static void
|
||
sppp_lcp_down(struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
|
||
sppp_down_event(&lcp, sp);
|
||
|
||
/*
|
||
* If this is neither a dial-on-demand nor a passive
|
||
* interface, simulate an ``ifconfig down'' action, so the
|
||
* administrator can force a redial by another ``ifconfig
|
||
* up''. XXX For leased line operation, should we immediately
|
||
* try to reopen the connection here?
|
||
*/
|
||
if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
|
||
log(LOG_INFO,
|
||
SPP_FMT "Down event, taking interface down.\n",
|
||
SPP_ARGS(ifp));
|
||
if_down(ifp);
|
||
} else {
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "Down event (carrier loss)\n",
|
||
SPP_ARGS(ifp));
|
||
}
|
||
sp->pp_flags &= ~PP_CALLIN;
|
||
if (sp->state[IDX_LCP] != STATE_INITIAL)
|
||
lcp.Close(sp);
|
||
ifp->if_flags &= ~IFF_RUNNING;
|
||
}
|
||
|
||
static void
|
||
sppp_lcp_open(struct sppp *sp)
|
||
{
|
||
/*
|
||
* If we are authenticator, negotiate LCP_AUTH
|
||
*/
|
||
if (sp->hisauth.proto != 0)
|
||
sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
|
||
else
|
||
sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
|
||
sp->pp_flags &= ~PP_NEEDAUTH;
|
||
sppp_open_event(&lcp, sp);
|
||
}
|
||
|
||
static void
|
||
sppp_lcp_close(struct sppp *sp)
|
||
{
|
||
sppp_close_event(&lcp, sp);
|
||
}
|
||
|
||
static void
|
||
sppp_lcp_TO(void *cookie)
|
||
{
|
||
sppp_to_event(&lcp, (struct sppp *)cookie);
|
||
}
|
||
|
||
/*
|
||
* Analyze a configure request. Return true if it was agreeable, and
|
||
* caused action sca, false if it has been rejected or nak'ed, and
|
||
* caused action scn. (The return value is used to make the state
|
||
* transition decision in the state automaton.)
|
||
*/
|
||
static int
|
||
sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
|
||
{
|
||
STDDCL;
|
||
u_char *buf, *r, *p;
|
||
int origlen, rlen;
|
||
u_long nmagic;
|
||
u_short authproto;
|
||
|
||
len -= 4;
|
||
origlen = len;
|
||
buf = r = malloc (len, M_TEMP, M_NOWAIT);
|
||
if (! buf)
|
||
return (0);
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
|
||
SPP_ARGS(ifp));
|
||
|
||
/* pass 1: check for things that need to be rejected */
|
||
p = (void*) (h+1);
|
||
for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
|
||
if (debug)
|
||
addlog(" %s ", sppp_lcp_opt_name(*p));
|
||
switch (*p) {
|
||
case LCP_OPT_MAGIC:
|
||
/* Magic number. */
|
||
/* fall through, both are same length */
|
||
case LCP_OPT_ASYNC_MAP:
|
||
/* Async control character map. */
|
||
if (len >= 6 || p[1] == 6)
|
||
continue;
|
||
if (debug)
|
||
addlog("[invalid] ");
|
||
break;
|
||
case LCP_OPT_MRU:
|
||
/* Maximum receive unit. */
|
||
if (len >= 4 && p[1] == 4)
|
||
continue;
|
||
if (debug)
|
||
addlog("[invalid] ");
|
||
break;
|
||
case LCP_OPT_AUTH_PROTO:
|
||
if (len < 4) {
|
||
if (debug)
|
||
addlog("[invalid] ");
|
||
break;
|
||
}
|
||
authproto = (p[2] << 8) + p[3];
|
||
if (authproto == PPP_CHAP && p[1] != 5) {
|
||
if (debug)
|
||
addlog("[invalid chap len] ");
|
||
break;
|
||
}
|
||
if (sp->myauth.proto == 0) {
|
||
/* we are not configured to do auth */
|
||
if (debug)
|
||
addlog("[not configured] ");
|
||
break;
|
||
}
|
||
/*
|
||
* Remote want us to authenticate, remember this,
|
||
* so we stay in PHASE_AUTHENTICATE after LCP got
|
||
* up.
|
||
*/
|
||
sp->pp_flags |= PP_NEEDAUTH;
|
||
continue;
|
||
default:
|
||
/* Others not supported. */
|
||
if (debug)
|
||
addlog("[rej] ");
|
||
break;
|
||
}
|
||
/* Add the option to rejected list. */
|
||
bcopy (p, r, p[1]);
|
||
r += p[1];
|
||
rlen += p[1];
|
||
}
|
||
if (rlen) {
|
||
if (debug)
|
||
addlog(" send conf-rej\n");
|
||
sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
|
||
return 0;
|
||
} else if (debug)
|
||
addlog("\n");
|
||
|
||
/*
|
||
* pass 2: check for option values that are unacceptable and
|
||
* thus require to be nak'ed.
|
||
*/
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
|
||
SPP_ARGS(ifp));
|
||
|
||
p = (void*) (h+1);
|
||
len = origlen;
|
||
for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
|
||
if (debug)
|
||
addlog(" %s ", sppp_lcp_opt_name(*p));
|
||
switch (*p) {
|
||
case LCP_OPT_MAGIC:
|
||
/* Magic number -- extract. */
|
||
nmagic = (u_long)p[2] << 24 |
|
||
(u_long)p[3] << 16 | p[4] << 8 | p[5];
|
||
if (nmagic != sp->lcp.magic) {
|
||
if (debug)
|
||
addlog("0x%lx ", nmagic);
|
||
continue;
|
||
}
|
||
/*
|
||
* Local and remote magics equal -- loopback?
|
||
*/
|
||
if (sp->pp_loopcnt >= MAXALIVECNT*5) {
|
||
printf (SPP_FMT "loopback\n",
|
||
SPP_ARGS(ifp));
|
||
sp->pp_loopcnt = 0;
|
||
if (ifp->if_flags & IFF_UP) {
|
||
if_down(ifp);
|
||
sppp_qflush(&sp->pp_cpq);
|
||
/* XXX ? */
|
||
lcp.Down(sp);
|
||
lcp.Up(sp);
|
||
}
|
||
} else if (debug)
|
||
addlog("[glitch] ");
|
||
++sp->pp_loopcnt;
|
||
/*
|
||
* We negate our magic here, and NAK it. If
|
||
* we see it later in an NAK packet, we
|
||
* suggest a new one.
|
||
*/
|
||
nmagic = ~sp->lcp.magic;
|
||
/* Gonna NAK it. */
|
||
p[2] = nmagic >> 24;
|
||
p[3] = nmagic >> 16;
|
||
p[4] = nmagic >> 8;
|
||
p[5] = nmagic;
|
||
break;
|
||
|
||
case LCP_OPT_ASYNC_MAP:
|
||
/* Async control character map -- check to be zero. */
|
||
if (! p[2] && ! p[3] && ! p[4] && ! p[5]) {
|
||
if (debug)
|
||
addlog("[empty] ");
|
||
continue;
|
||
}
|
||
if (debug)
|
||
addlog("[non-empty] ");
|
||
/* suggest a zero one */
|
||
p[2] = p[3] = p[4] = p[5] = 0;
|
||
break;
|
||
|
||
case LCP_OPT_MRU:
|
||
/*
|
||
* Maximum receive unit. Always agreeable,
|
||
* but ignored by now.
|
||
*/
|
||
sp->lcp.their_mru = p[2] * 256 + p[3];
|
||
if (debug)
|
||
addlog("%lu ", sp->lcp.their_mru);
|
||
continue;
|
||
|
||
case LCP_OPT_AUTH_PROTO:
|
||
authproto = (p[2] << 8) + p[3];
|
||
if (sp->myauth.proto != authproto) {
|
||
/* not agreed, nak */
|
||
if (debug)
|
||
addlog("[mine %s != his %s] ",
|
||
sppp_proto_name(sp->hisauth.proto),
|
||
sppp_proto_name(authproto));
|
||
p[2] = sp->myauth.proto >> 8;
|
||
p[3] = sp->myauth.proto;
|
||
break;
|
||
}
|
||
if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
|
||
if (debug)
|
||
addlog("[chap not MD5] ");
|
||
p[4] = CHAP_MD5;
|
||
break;
|
||
}
|
||
continue;
|
||
}
|
||
/* Add the option to nak'ed list. */
|
||
bcopy (p, r, p[1]);
|
||
r += p[1];
|
||
rlen += p[1];
|
||
}
|
||
if (rlen) {
|
||
if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
|
||
if (debug)
|
||
addlog(" max_failure (%d) exceeded, "
|
||
"send conf-rej\n",
|
||
sp->lcp.max_failure);
|
||
sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
|
||
} else {
|
||
if (debug)
|
||
addlog(" send conf-nak\n");
|
||
sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
|
||
}
|
||
return 0;
|
||
} else {
|
||
if (debug)
|
||
addlog(" send conf-ack\n");
|
||
sp->fail_counter[IDX_LCP] = 0;
|
||
sp->pp_loopcnt = 0;
|
||
sppp_cp_send (sp, PPP_LCP, CONF_ACK,
|
||
h->ident, origlen, h+1);
|
||
}
|
||
|
||
free (buf, M_TEMP);
|
||
return (rlen == 0);
|
||
}
|
||
|
||
/*
|
||
* Analyze the LCP Configure-Reject option list, and adjust our
|
||
* negotiation.
|
||
*/
|
||
static void
|
||
sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
|
||
{
|
||
STDDCL;
|
||
u_char *buf, *p;
|
||
|
||
len -= 4;
|
||
buf = malloc (len, M_TEMP, M_NOWAIT);
|
||
if (!buf)
|
||
return;
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
|
||
SPP_ARGS(ifp));
|
||
|
||
p = (void*) (h+1);
|
||
for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
|
||
if (debug)
|
||
addlog(" %s ", sppp_lcp_opt_name(*p));
|
||
switch (*p) {
|
||
case LCP_OPT_MAGIC:
|
||
/* Magic number -- can't use it, use 0 */
|
||
sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
|
||
sp->lcp.magic = 0;
|
||
break;
|
||
case LCP_OPT_MRU:
|
||
/*
|
||
* Should not be rejected anyway, since we only
|
||
* negotiate a MRU if explicitly requested by
|
||
* peer.
|
||
*/
|
||
sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
|
||
break;
|
||
case LCP_OPT_AUTH_PROTO:
|
||
/*
|
||
* Peer doesn't want to authenticate himself,
|
||
* deny unless this is a dialout call, and
|
||
* AUTHFLAG_NOCALLOUT is set.
|
||
*/
|
||
if ((sp->pp_flags & PP_CALLIN) == 0 &&
|
||
(sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
|
||
if (debug)
|
||
addlog("[don't insist on auth "
|
||
"for callout]");
|
||
sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
|
||
break;
|
||
}
|
||
if (debug)
|
||
addlog("[access denied]\n");
|
||
lcp.Close(sp);
|
||
break;
|
||
}
|
||
}
|
||
if (debug)
|
||
addlog("\n");
|
||
free (buf, M_TEMP);
|
||
return;
|
||
}
|
||
|
||
/*
|
||
* Analyze the LCP Configure-NAK option list, and adjust our
|
||
* negotiation.
|
||
*/
|
||
static void
|
||
sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
|
||
{
|
||
STDDCL;
|
||
u_char *buf, *p;
|
||
u_long magic;
|
||
|
||
len -= 4;
|
||
buf = malloc (len, M_TEMP, M_NOWAIT);
|
||
if (!buf)
|
||
return;
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
|
||
SPP_ARGS(ifp));
|
||
|
||
p = (void*) (h+1);
|
||
for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
|
||
if (debug)
|
||
addlog(" %s ", sppp_lcp_opt_name(*p));
|
||
switch (*p) {
|
||
case LCP_OPT_MAGIC:
|
||
/* Magic number -- renegotiate */
|
||
if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
|
||
len >= 6 && p[1] == 6) {
|
||
magic = (u_long)p[2] << 24 |
|
||
(u_long)p[3] << 16 | p[4] << 8 | p[5];
|
||
/*
|
||
* If the remote magic is our negated one,
|
||
* this looks like a loopback problem.
|
||
* Suggest a new magic to make sure.
|
||
*/
|
||
if (magic == ~sp->lcp.magic) {
|
||
if (debug)
|
||
addlog("magic glitch ");
|
||
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
||
sp->lcp.magic = random();
|
||
#else
|
||
sp->lcp.magic = time.tv_sec + time.tv_usec;
|
||
#endif
|
||
} else {
|
||
sp->lcp.magic = magic;
|
||
if (debug)
|
||
addlog("%lu ", magic);
|
||
}
|
||
}
|
||
break;
|
||
case LCP_OPT_MRU:
|
||
/*
|
||
* Peer wants to advise us to negotiate an MRU.
|
||
* Agree on it if it's reasonable, or use
|
||
* default otherwise.
|
||
*/
|
||
if (len >= 4 && p[1] == 4) {
|
||
u_int mru = p[2] * 256 + p[3];
|
||
if (debug)
|
||
addlog("%d ", mru);
|
||
if (mru < PP_MTU || mru > PP_MAX_MRU)
|
||
mru = PP_MTU;
|
||
sp->lcp.mru = mru;
|
||
sp->lcp.opts |= (1 << LCP_OPT_MRU);
|
||
}
|
||
break;
|
||
case LCP_OPT_AUTH_PROTO:
|
||
/*
|
||
* Peer doesn't like our authentication method,
|
||
* deny.
|
||
*/
|
||
if (debug)
|
||
addlog("[access denied]\n");
|
||
lcp.Close(sp);
|
||
break;
|
||
}
|
||
}
|
||
if (debug)
|
||
addlog("\n");
|
||
free (buf, M_TEMP);
|
||
return;
|
||
}
|
||
|
||
static void
|
||
sppp_lcp_tlu(struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
int i;
|
||
u_long mask;
|
||
|
||
/* XXX ? */
|
||
if (! (ifp->if_flags & IFF_UP) &&
|
||
(ifp->if_flags & IFF_RUNNING)) {
|
||
/* Coming out of loopback mode. */
|
||
if_up(ifp);
|
||
printf (SPP_FMT "up\n", SPP_ARGS(ifp));
|
||
}
|
||
|
||
for (i = 0; i < IDX_COUNT; i++)
|
||
if ((cps[i])->flags & CP_QUAL)
|
||
(cps[i])->Open(sp);
|
||
|
||
if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
|
||
(sp->pp_flags & PP_NEEDAUTH) != 0)
|
||
sp->pp_phase = PHASE_AUTHENTICATE;
|
||
else
|
||
sp->pp_phase = PHASE_NETWORK;
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
|
||
sppp_phase_name(sp->pp_phase));
|
||
|
||
/*
|
||
* Open all authentication protocols. This is even required
|
||
* if we already proceeded to network phase, since it might be
|
||
* that remote wants us to authenticate, so we might have to
|
||
* send a PAP request. Undesired authentication protocols
|
||
* don't do anything when they get an Open event.
|
||
*/
|
||
for (i = 0; i < IDX_COUNT; i++)
|
||
if ((cps[i])->flags & CP_AUTH)
|
||
(cps[i])->Open(sp);
|
||
|
||
if (sp->pp_phase == PHASE_NETWORK) {
|
||
/* Notify all NCPs. */
|
||
for (i = 0; i < IDX_COUNT; i++)
|
||
if ((cps[i])->flags & CP_NCP)
|
||
(cps[i])->Open(sp);
|
||
}
|
||
|
||
/* Send Up events to all started protos. */
|
||
for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
|
||
if (sp->lcp.protos & mask && ((cps[i])->flags & CP_LCP) == 0)
|
||
(cps[i])->Up(sp);
|
||
|
||
/* notify low-level driver of state change */
|
||
if (sp->pp_chg)
|
||
sp->pp_chg(sp, (int)sp->pp_phase);
|
||
|
||
if (sp->pp_phase == PHASE_NETWORK)
|
||
/* if no NCP is starting, close down */
|
||
sppp_lcp_check_and_close(sp);
|
||
}
|
||
|
||
static void
|
||
sppp_lcp_tld(struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
int i;
|
||
u_long mask;
|
||
|
||
sp->pp_phase = PHASE_TERMINATE;
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
|
||
sppp_phase_name(sp->pp_phase));
|
||
|
||
/*
|
||
* Take upper layers down. We send the Down event first and
|
||
* the Close second to prevent the upper layers from sending
|
||
* ``a flurry of terminate-request packets'', as the RFC
|
||
* describes it.
|
||
*/
|
||
for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
|
||
if (sp->lcp.protos & mask && ((cps[i])->flags & CP_LCP) == 0) {
|
||
(cps[i])->Down(sp);
|
||
(cps[i])->Close(sp);
|
||
}
|
||
}
|
||
|
||
static void
|
||
sppp_lcp_tls(struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
|
||
sp->pp_phase = PHASE_ESTABLISH;
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
|
||
sppp_phase_name(sp->pp_phase));
|
||
|
||
/* Notify lower layer if desired. */
|
||
if (sp->pp_tls)
|
||
(sp->pp_tls)(sp);
|
||
else
|
||
(sp->pp_up)(sp);
|
||
}
|
||
|
||
static void
|
||
sppp_lcp_tlf(struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
|
||
sp->pp_phase = PHASE_DEAD;
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
|
||
sppp_phase_name(sp->pp_phase));
|
||
|
||
/* Notify lower layer if desired. */
|
||
if (sp->pp_tlf)
|
||
(sp->pp_tlf)(sp);
|
||
else
|
||
(sp->pp_down)(sp);
|
||
}
|
||
|
||
static void
|
||
sppp_lcp_scr(struct sppp *sp)
|
||
{
|
||
char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
|
||
int i = 0;
|
||
u_short authproto;
|
||
|
||
if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
|
||
if (! sp->lcp.magic)
|
||
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
||
sp->lcp.magic = random();
|
||
#else
|
||
sp->lcp.magic = time.tv_sec + time.tv_usec;
|
||
#endif
|
||
opt[i++] = LCP_OPT_MAGIC;
|
||
opt[i++] = 6;
|
||
opt[i++] = sp->lcp.magic >> 24;
|
||
opt[i++] = sp->lcp.magic >> 16;
|
||
opt[i++] = sp->lcp.magic >> 8;
|
||
opt[i++] = sp->lcp.magic;
|
||
}
|
||
|
||
if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
|
||
opt[i++] = LCP_OPT_MRU;
|
||
opt[i++] = 4;
|
||
opt[i++] = sp->lcp.mru >> 8;
|
||
opt[i++] = sp->lcp.mru;
|
||
}
|
||
|
||
if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
|
||
authproto = sp->hisauth.proto;
|
||
opt[i++] = LCP_OPT_AUTH_PROTO;
|
||
opt[i++] = authproto == PPP_CHAP? 5: 4;
|
||
opt[i++] = authproto >> 8;
|
||
opt[i++] = authproto;
|
||
if (authproto == PPP_CHAP)
|
||
opt[i++] = CHAP_MD5;
|
||
}
|
||
|
||
sp->confid[IDX_LCP] = ++sp->pp_seq;
|
||
sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
|
||
}
|
||
|
||
/*
|
||
* Check the open NCPs, return true if at least one NCP is open.
|
||
*/
|
||
static int
|
||
sppp_ncp_check(struct sppp *sp)
|
||
{
|
||
int i, mask;
|
||
|
||
for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
|
||
if (sp->lcp.protos & mask && (cps[i])->flags & CP_NCP)
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Re-check the open NCPs and see if we should terminate the link.
|
||
* Called by the NCPs during their tlf action handling.
|
||
*/
|
||
static void
|
||
sppp_lcp_check_and_close(struct sppp *sp)
|
||
{
|
||
|
||
if (sp->pp_phase < PHASE_NETWORK)
|
||
/* don't bother, we are already going down */
|
||
return;
|
||
|
||
if (sppp_ncp_check(sp))
|
||
return;
|
||
|
||
lcp.Close(sp);
|
||
}
|
||
/*
|
||
*--------------------------------------------------------------------------*
|
||
* *
|
||
* The IPCP implementation. *
|
||
* *
|
||
*--------------------------------------------------------------------------*
|
||
*/
|
||
|
||
static void
|
||
sppp_ipcp_init(struct sppp *sp)
|
||
{
|
||
sp->ipcp.opts = 0;
|
||
sp->ipcp.flags = 0;
|
||
sp->state[IDX_IPCP] = STATE_INITIAL;
|
||
sp->fail_counter[IDX_IPCP] = 0;
|
||
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
||
callout_handle_init(&sp->ch[IDX_IPCP]);
|
||
#endif
|
||
}
|
||
|
||
static void
|
||
sppp_ipcp_up(struct sppp *sp)
|
||
{
|
||
sppp_up_event(&ipcp, sp);
|
||
}
|
||
|
||
static void
|
||
sppp_ipcp_down(struct sppp *sp)
|
||
{
|
||
sppp_down_event(&ipcp, sp);
|
||
}
|
||
|
||
static void
|
||
sppp_ipcp_open(struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
u_long myaddr, hisaddr;
|
||
|
||
sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN);
|
||
|
||
sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
|
||
/*
|
||
* If we don't have his address, this probably means our
|
||
* interface doesn't want to talk IP at all. (This could
|
||
* be the case if somebody wants to speak only IPX, for
|
||
* example.) Don't open IPCP in this case.
|
||
*/
|
||
if (hisaddr == 0L) {
|
||
/* XXX this message should go away */
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
|
||
SPP_ARGS(ifp));
|
||
return;
|
||
}
|
||
|
||
if (myaddr == 0L) {
|
||
/*
|
||
* I don't have an assigned address, so i need to
|
||
* negotiate my address.
|
||
*/
|
||
sp->ipcp.flags |= IPCP_MYADDR_DYN;
|
||
sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
|
||
} else
|
||
sp->ipcp.flags |= IPCP_MYADDR_SEEN;
|
||
sppp_open_event(&ipcp, sp);
|
||
}
|
||
|
||
static void
|
||
sppp_ipcp_close(struct sppp *sp)
|
||
{
|
||
sppp_close_event(&ipcp, sp);
|
||
if (sp->ipcp.flags & IPCP_MYADDR_DYN)
|
||
/*
|
||
* My address was dynamic, clear it again.
|
||
*/
|
||
sppp_set_ip_addr(sp, 0L);
|
||
}
|
||
|
||
static void
|
||
sppp_ipcp_TO(void *cookie)
|
||
{
|
||
sppp_to_event(&ipcp, (struct sppp *)cookie);
|
||
}
|
||
|
||
/*
|
||
* Analyze a configure request. Return true if it was agreeable, and
|
||
* caused action sca, false if it has been rejected or nak'ed, and
|
||
* caused action scn. (The return value is used to make the state
|
||
* transition decision in the state automaton.)
|
||
*/
|
||
static int
|
||
sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
|
||
{
|
||
u_char *buf, *r, *p;
|
||
struct ifnet *ifp = &sp->pp_if;
|
||
int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
|
||
u_long hisaddr, desiredaddr;
|
||
int gotmyaddr = 0;
|
||
|
||
len -= 4;
|
||
origlen = len;
|
||
/*
|
||
* Make sure to allocate a buf that can at least hold a
|
||
* conf-nak with an `address' option. We might need it below.
|
||
*/
|
||
buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
|
||
if (! buf)
|
||
return (0);
|
||
|
||
/* pass 1: see if we can recognize them */
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
|
||
SPP_ARGS(ifp));
|
||
p = (void*) (h+1);
|
||
for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
|
||
if (debug)
|
||
addlog(" %s ", sppp_ipcp_opt_name(*p));
|
||
switch (*p) {
|
||
case IPCP_OPT_ADDRESS:
|
||
if (len >= 6 && p[1] == 6) {
|
||
/* correctly formed address option */
|
||
continue;
|
||
}
|
||
if (debug)
|
||
addlog("[invalid] ");
|
||
break;
|
||
default:
|
||
/* Others not supported. */
|
||
if (debug)
|
||
addlog("[rej] ");
|
||
break;
|
||
}
|
||
/* Add the option to rejected list. */
|
||
bcopy (p, r, p[1]);
|
||
r += p[1];
|
||
rlen += p[1];
|
||
}
|
||
if (rlen) {
|
||
if (debug)
|
||
addlog(" send conf-rej\n");
|
||
sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
|
||
return 0;
|
||
} else if (debug)
|
||
addlog("\n");
|
||
|
||
/* pass 2: parse option values */
|
||
sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
|
||
SPP_ARGS(ifp));
|
||
p = (void*) (h+1);
|
||
len = origlen;
|
||
for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
|
||
if (debug)
|
||
addlog(" %s ", sppp_ipcp_opt_name(*p));
|
||
switch (*p) {
|
||
case IPCP_OPT_ADDRESS:
|
||
/* This is the address he wants in his end */
|
||
desiredaddr = p[2] << 24 | p[3] << 16 |
|
||
p[4] << 8 | p[5];
|
||
if (desiredaddr == hisaddr ||
|
||
(hisaddr == 1 && desiredaddr != 0)) {
|
||
/*
|
||
* Peer's address is same as our value,
|
||
* or we have set it to 0.0.0.1 to
|
||
* indicate that we do not really care,
|
||
* this is agreeable. Gonna conf-ack
|
||
* it.
|
||
*/
|
||
if (debug)
|
||
addlog("%s [ack] ",
|
||
sppp_dotted_quad(hisaddr));
|
||
/* record that we've seen it already */
|
||
sp->ipcp.flags |= IPCP_HISADDR_SEEN;
|
||
continue;
|
||
}
|
||
/*
|
||
* The address wasn't agreeable. This is either
|
||
* he sent us 0.0.0.0, asking to assign him an
|
||
* address, or he send us another address not
|
||
* matching our value. Either case, we gonna
|
||
* conf-nak it with our value.
|
||
* XXX: we should "rej" if hisaddr == 0
|
||
*/
|
||
if (debug) {
|
||
if (desiredaddr == 0)
|
||
addlog("[addr requested] ");
|
||
else
|
||
addlog("%s [not agreed] ",
|
||
sppp_dotted_quad(desiredaddr));
|
||
|
||
}
|
||
p[2] = hisaddr >> 24;
|
||
p[3] = hisaddr >> 16;
|
||
p[4] = hisaddr >> 8;
|
||
p[5] = hisaddr;
|
||
break;
|
||
}
|
||
/* Add the option to nak'ed list. */
|
||
bcopy (p, r, p[1]);
|
||
r += p[1];
|
||
rlen += p[1];
|
||
}
|
||
|
||
/*
|
||
* If we are about to conf-ack the request, but haven't seen
|
||
* his address so far, gonna conf-nak it instead, with the
|
||
* `address' option present and our idea of his address being
|
||
* filled in there, to request negotiation of both addresses.
|
||
*
|
||
* XXX This can result in an endless req - nak loop if peer
|
||
* doesn't want to send us his address. Q: What should we do
|
||
* about it? XXX A: implement the max-failure counter.
|
||
*/
|
||
if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
|
||
buf[0] = IPCP_OPT_ADDRESS;
|
||
buf[1] = 6;
|
||
buf[2] = hisaddr >> 24;
|
||
buf[3] = hisaddr >> 16;
|
||
buf[4] = hisaddr >> 8;
|
||
buf[5] = hisaddr;
|
||
rlen = 6;
|
||
if (debug)
|
||
addlog("still need hisaddr ");
|
||
}
|
||
|
||
if (rlen) {
|
||
if (debug)
|
||
addlog(" send conf-nak\n");
|
||
sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
|
||
} else {
|
||
if (debug)
|
||
addlog(" send conf-ack\n");
|
||
sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
|
||
h->ident, origlen, h+1);
|
||
}
|
||
|
||
free (buf, M_TEMP);
|
||
return (rlen == 0);
|
||
}
|
||
|
||
/*
|
||
* Analyze the IPCP Configure-Reject option list, and adjust our
|
||
* negotiation.
|
||
*/
|
||
static void
|
||
sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
|
||
{
|
||
u_char *buf, *p;
|
||
struct ifnet *ifp = &sp->pp_if;
|
||
int debug = ifp->if_flags & IFF_DEBUG;
|
||
|
||
len -= 4;
|
||
buf = malloc (len, M_TEMP, M_NOWAIT);
|
||
if (!buf)
|
||
return;
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
|
||
SPP_ARGS(ifp));
|
||
|
||
p = (void*) (h+1);
|
||
for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
|
||
if (debug)
|
||
addlog(" %s ", sppp_ipcp_opt_name(*p));
|
||
switch (*p) {
|
||
case IPCP_OPT_ADDRESS:
|
||
/*
|
||
* Peer doesn't grok address option. This is
|
||
* bad. XXX Should we better give up here?
|
||
* XXX We could try old "addresses" option...
|
||
*/
|
||
sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
|
||
break;
|
||
}
|
||
}
|
||
if (debug)
|
||
addlog("\n");
|
||
free (buf, M_TEMP);
|
||
return;
|
||
}
|
||
|
||
/*
|
||
* Analyze the IPCP Configure-NAK option list, and adjust our
|
||
* negotiation.
|
||
*/
|
||
static void
|
||
sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
|
||
{
|
||
u_char *buf, *p;
|
||
struct ifnet *ifp = &sp->pp_if;
|
||
int debug = ifp->if_flags & IFF_DEBUG;
|
||
u_long wantaddr;
|
||
|
||
len -= 4;
|
||
buf = malloc (len, M_TEMP, M_NOWAIT);
|
||
if (!buf)
|
||
return;
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
|
||
SPP_ARGS(ifp));
|
||
|
||
p = (void*) (h+1);
|
||
for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
|
||
if (debug)
|
||
addlog(" %s ", sppp_ipcp_opt_name(*p));
|
||
switch (*p) {
|
||
case IPCP_OPT_ADDRESS:
|
||
/*
|
||
* Peer doesn't like our local IP address. See
|
||
* if we can do something for him. We'll drop
|
||
* him our address then.
|
||
*/
|
||
if (len >= 6 && p[1] == 6) {
|
||
wantaddr = p[2] << 24 | p[3] << 16 |
|
||
p[4] << 8 | p[5];
|
||
sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
|
||
if (debug)
|
||
addlog("[wantaddr %s] ",
|
||
sppp_dotted_quad(wantaddr));
|
||
/*
|
||
* When doing dynamic address assignment,
|
||
* we accept his offer. Otherwise, we
|
||
* ignore it and thus continue to negotiate
|
||
* our already existing value.
|
||
* XXX: Bogus, if he said no once, he'll
|
||
* just say no again, might as well die.
|
||
*/
|
||
if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
|
||
sppp_set_ip_addr(sp, wantaddr);
|
||
if (debug)
|
||
addlog("[agree] ");
|
||
sp->ipcp.flags |= IPCP_MYADDR_SEEN;
|
||
}
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
if (debug)
|
||
addlog("\n");
|
||
free (buf, M_TEMP);
|
||
return;
|
||
}
|
||
|
||
static void
|
||
sppp_ipcp_tlu(struct sppp *sp)
|
||
{
|
||
/* we are up - notify isdn daemon */
|
||
if (sp->pp_con)
|
||
sp->pp_con(sp);
|
||
}
|
||
|
||
static void
|
||
sppp_ipcp_tld(struct sppp *sp)
|
||
{
|
||
}
|
||
|
||
static void
|
||
sppp_ipcp_tls(struct sppp *sp)
|
||
{
|
||
/* indicate to LCP that it must stay alive */
|
||
sp->lcp.protos |= (1 << IDX_IPCP);
|
||
}
|
||
|
||
static void
|
||
sppp_ipcp_tlf(struct sppp *sp)
|
||
{
|
||
/* we no longer need LCP */
|
||
sp->lcp.protos &= ~(1 << IDX_IPCP);
|
||
sppp_lcp_check_and_close(sp);
|
||
}
|
||
|
||
static void
|
||
sppp_ipcp_scr(struct sppp *sp)
|
||
{
|
||
char opt[6 /* compression */ + 6 /* address */];
|
||
u_long ouraddr;
|
||
int i = 0;
|
||
|
||
if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
|
||
sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
|
||
opt[i++] = IPCP_OPT_ADDRESS;
|
||
opt[i++] = 6;
|
||
opt[i++] = ouraddr >> 24;
|
||
opt[i++] = ouraddr >> 16;
|
||
opt[i++] = ouraddr >> 8;
|
||
opt[i++] = ouraddr;
|
||
}
|
||
|
||
sp->confid[IDX_IPCP] = ++sp->pp_seq;
|
||
sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
|
||
}
|
||
|
||
|
||
/*
|
||
*--------------------------------------------------------------------------*
|
||
* *
|
||
* The CHAP implementation. *
|
||
* *
|
||
*--------------------------------------------------------------------------*
|
||
*/
|
||
|
||
/*
|
||
* The authentication protocols don't employ a full-fledged state machine as
|
||
* the control protocols do, since they do have Open and Close events, but
|
||
* not Up and Down, nor are they explicitly terminated. Also, use of the
|
||
* authentication protocols may be different in both directions (this makes
|
||
* sense, think of a machine that never accepts incoming calls but only
|
||
* calls out, it doesn't require the called party to authenticate itself).
|
||
*
|
||
* Our state machine for the local authentication protocol (we are requesting
|
||
* the peer to authenticate) looks like:
|
||
*
|
||
* RCA-
|
||
* +--------------------------------------------+
|
||
* V scn,tld|
|
||
* +--------+ Close +---------+ RCA+
|
||
* | |<----------------------------------| |------+
|
||
* +--->| Closed | TO* | Opened | sca |
|
||
* | | |-----+ +-------| |<-----+
|
||
* | +--------+ irc | | +---------+
|
||
* | ^ | | ^
|
||
* | | | | |
|
||
* | | | | |
|
||
* | TO-| | | |
|
||
* | |tld TO+ V | |
|
||
* | | +------->+ | |
|
||
* | | | | | |
|
||
* | +--------+ V | |
|
||
* | | |<----+<--------------------+ |
|
||
* | | Req- | scr |
|
||
* | | Sent | |
|
||
* | | | |
|
||
* | +--------+ |
|
||
* | RCA- | | RCA+ |
|
||
* +------+ +------------------------------------------+
|
||
* scn,tld sca,irc,ict,tlu
|
||
*
|
||
*
|
||
* with:
|
||
*
|
||
* Open: LCP reached authentication phase
|
||
* Close: LCP reached terminate phase
|
||
*
|
||
* RCA+: received reply (pap-req, chap-response), acceptable
|
||
* RCN: received reply (pap-req, chap-response), not acceptable
|
||
* TO+: timeout with restart counter >= 0
|
||
* TO-: timeout with restart counter < 0
|
||
* TO*: reschedule timeout for CHAP
|
||
*
|
||
* scr: send request packet (none for PAP, chap-challenge)
|
||
* sca: send ack packet (pap-ack, chap-success)
|
||
* scn: send nak packet (pap-nak, chap-failure)
|
||
* ict: initialize re-challenge timer (CHAP only)
|
||
*
|
||
* tlu: this-layer-up, LCP reaches network phase
|
||
* tld: this-layer-down, LCP enters terminate phase
|
||
*
|
||
* Note that in CHAP mode, after sending a new challenge, while the state
|
||
* automaton falls back into Req-Sent state, it doesn't signal a tld
|
||
* event to LCP, so LCP remains in network phase. Only after not getting
|
||
* any response (or after getting an unacceptable response), CHAP closes,
|
||
* causing LCP to enter terminate phase.
|
||
*
|
||
* With PAP, there is no initial request that can be sent. The peer is
|
||
* expected to send one based on the successful negotiation of PAP as
|
||
* the authentication protocol during the LCP option negotiation.
|
||
*
|
||
* Incoming authentication protocol requests (remote requests
|
||
* authentication, we are peer) don't employ a state machine at all,
|
||
* they are simply answered. Some peers [Ascend P50 firmware rev
|
||
* 4.50] react allergically when sending IPCP requests while they are
|
||
* still in authentication phase (thereby violating the standard that
|
||
* demands that these NCP packets are to be discarded), so we keep
|
||
* track of the peer demanding us to authenticate, and only proceed to
|
||
* phase network once we've seen a positive acknowledge for the
|
||
* authentication.
|
||
*/
|
||
|
||
/*
|
||
* Handle incoming CHAP packets.
|
||
*/
|
||
void
|
||
sppp_chap_input(struct sppp *sp, struct mbuf *m)
|
||
{
|
||
STDDCL;
|
||
struct lcp_header *h;
|
||
int len, x;
|
||
u_char *value, *name, digest[AUTHKEYLEN], dsize;
|
||
int value_len, name_len;
|
||
MD5_CTX ctx;
|
||
|
||
len = m->m_pkthdr.len;
|
||
if (len < 4) {
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "chap invalid packet length: %d bytes\n",
|
||
SPP_ARGS(ifp), len);
|
||
return;
|
||
}
|
||
h = mtod (m, struct lcp_header*);
|
||
if (len > ntohs (h->len))
|
||
len = ntohs (h->len);
|
||
|
||
switch (h->type) {
|
||
/* challenge, failure and success are his authproto */
|
||
case CHAP_CHALLENGE:
|
||
value = 1 + (u_char*)(h+1);
|
||
value_len = value[-1];
|
||
name = value + value_len;
|
||
name_len = len - value_len - 5;
|
||
if (name_len < 0) {
|
||
if (debug) {
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "chap corrupted challenge "
|
||
"<%s id=0x%x len=%d",
|
||
SPP_ARGS(ifp),
|
||
sppp_auth_type_name(PPP_CHAP, h->type),
|
||
h->ident, ntohs(h->len));
|
||
sppp_print_bytes((u_char*) (h+1), len-4);
|
||
addlog(">\n");
|
||
}
|
||
break;
|
||
}
|
||
|
||
if (debug) {
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "chap input <%s id=0x%x len=%d name=",
|
||
SPP_ARGS(ifp),
|
||
sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
|
||
ntohs(h->len));
|
||
sppp_print_string((char*) name, name_len);
|
||
addlog(" value-size=%d value=", value_len);
|
||
sppp_print_bytes(value, value_len);
|
||
addlog(">\n");
|
||
}
|
||
|
||
/* Compute reply value. */
|
||
MD5Init(&ctx);
|
||
MD5Update(&ctx, &h->ident, 1);
|
||
MD5Update(&ctx, sp->myauth.secret,
|
||
sppp_strnlen(sp->myauth.secret, AUTHKEYLEN));
|
||
MD5Update(&ctx, value, value_len);
|
||
MD5Final(digest, &ctx);
|
||
dsize = sizeof digest;
|
||
|
||
sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
|
||
sizeof dsize, (const char *)&dsize,
|
||
sizeof digest, digest,
|
||
(size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
|
||
sp->myauth.name,
|
||
0);
|
||
break;
|
||
|
||
case CHAP_SUCCESS:
|
||
if (debug) {
|
||
log(LOG_DEBUG, SPP_FMT "chap success",
|
||
SPP_ARGS(ifp));
|
||
if (len > 4) {
|
||
addlog(": ");
|
||
sppp_print_string((char*)(h + 1), len - 4);
|
||
}
|
||
addlog("\n");
|
||
}
|
||
x = splimp();
|
||
sp->pp_flags &= ~PP_NEEDAUTH;
|
||
if (sp->myauth.proto == PPP_CHAP &&
|
||
(sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
|
||
(sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
|
||
/*
|
||
* We are authenticator for CHAP but didn't
|
||
* complete yet. Leave it to tlu to proceed
|
||
* to network phase.
|
||
*/
|
||
splx(x);
|
||
break;
|
||
}
|
||
splx(x);
|
||
sppp_phase_network(sp);
|
||
break;
|
||
|
||
case CHAP_FAILURE:
|
||
if (debug) {
|
||
log(LOG_INFO, SPP_FMT "chap failure",
|
||
SPP_ARGS(ifp));
|
||
if (len > 4) {
|
||
addlog(": ");
|
||
sppp_print_string((char*)(h + 1), len - 4);
|
||
}
|
||
addlog("\n");
|
||
} else
|
||
log(LOG_INFO, SPP_FMT "chap failure\n",
|
||
SPP_ARGS(ifp));
|
||
/* await LCP shutdown by authenticator */
|
||
break;
|
||
|
||
/* response is my authproto */
|
||
case CHAP_RESPONSE:
|
||
value = 1 + (u_char*)(h+1);
|
||
value_len = value[-1];
|
||
name = value + value_len;
|
||
name_len = len - value_len - 5;
|
||
if (name_len < 0) {
|
||
if (debug) {
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "chap corrupted response "
|
||
"<%s id=0x%x len=%d",
|
||
SPP_ARGS(ifp),
|
||
sppp_auth_type_name(PPP_CHAP, h->type),
|
||
h->ident, ntohs(h->len));
|
||
sppp_print_bytes((u_char*)(h+1), len-4);
|
||
addlog(">\n");
|
||
}
|
||
break;
|
||
}
|
||
if (h->ident != sp->confid[IDX_CHAP]) {
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "chap dropping response for old ID "
|
||
"(got %d, expected %d)\n",
|
||
SPP_ARGS(ifp),
|
||
h->ident, sp->confid[IDX_CHAP]);
|
||
break;
|
||
}
|
||
if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)
|
||
|| bcmp(name, sp->hisauth.name, name_len) != 0) {
|
||
log(LOG_INFO, SPP_FMT "chap response, his name ",
|
||
SPP_ARGS(ifp));
|
||
sppp_print_string(name, name_len);
|
||
addlog(" != expected ");
|
||
sppp_print_string(sp->hisauth.name,
|
||
sppp_strnlen(sp->hisauth.name, AUTHNAMELEN));
|
||
addlog("\n");
|
||
}
|
||
if (debug) {
|
||
log(LOG_DEBUG, SPP_FMT "chap input(%s) "
|
||
"<%s id=0x%x len=%d name=",
|
||
SPP_ARGS(ifp),
|
||
sppp_state_name(sp->state[IDX_CHAP]),
|
||
sppp_auth_type_name(PPP_CHAP, h->type),
|
||
h->ident, ntohs (h->len));
|
||
sppp_print_string((char*)name, name_len);
|
||
addlog(" value-size=%d value=", value_len);
|
||
sppp_print_bytes(value, value_len);
|
||
addlog(">\n");
|
||
}
|
||
if (value_len != AUTHKEYLEN) {
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "chap bad hash value length: "
|
||
"%d bytes, should be %d\n",
|
||
SPP_ARGS(ifp), value_len,
|
||
AUTHKEYLEN);
|
||
break;
|
||
}
|
||
|
||
MD5Init(&ctx);
|
||
MD5Update(&ctx, &h->ident, 1);
|
||
MD5Update(&ctx, sp->hisauth.secret,
|
||
sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN));
|
||
MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN);
|
||
MD5Final(digest, &ctx);
|
||
|
||
#define FAILMSG "Failed..."
|
||
#define SUCCMSG "Welcome!"
|
||
|
||
if (value_len != sizeof digest ||
|
||
bcmp(digest, value, value_len) != 0) {
|
||
/* action scn, tld */
|
||
sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
|
||
sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
|
||
0);
|
||
chap.tld(sp);
|
||
break;
|
||
}
|
||
/* action sca, perhaps tlu */
|
||
if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
|
||
sp->state[IDX_CHAP] == STATE_OPENED)
|
||
sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
|
||
sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
|
||
0);
|
||
if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
|
||
sppp_cp_change_state(&chap, sp, STATE_OPENED);
|
||
chap.tlu(sp);
|
||
}
|
||
break;
|
||
|
||
default:
|
||
/* Unknown CHAP packet type -- ignore. */
|
||
if (debug) {
|
||
log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) "
|
||
"<0x%x id=0x%xh len=%d",
|
||
SPP_ARGS(ifp),
|
||
sppp_state_name(sp->state[IDX_CHAP]),
|
||
h->type, h->ident, ntohs(h->len));
|
||
sppp_print_bytes((u_char*)(h+1), len-4);
|
||
addlog(">\n");
|
||
}
|
||
break;
|
||
|
||
}
|
||
}
|
||
|
||
static void
|
||
sppp_chap_init(struct sppp *sp)
|
||
{
|
||
/* Chap doesn't have STATE_INITIAL at all. */
|
||
sp->state[IDX_CHAP] = STATE_CLOSED;
|
||
sp->fail_counter[IDX_CHAP] = 0;
|
||
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
||
callout_handle_init(&sp->ch[IDX_CHAP]);
|
||
#endif
|
||
}
|
||
|
||
static void
|
||
sppp_chap_open(struct sppp *sp)
|
||
{
|
||
if (sp->myauth.proto == PPP_CHAP &&
|
||
(sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
|
||
/* we are authenticator for CHAP, start it */
|
||
chap.scr(sp);
|
||
sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
|
||
sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
|
||
}
|
||
/* nothing to be done if we are peer, await a challenge */
|
||
}
|
||
|
||
static void
|
||
sppp_chap_close(struct sppp *sp)
|
||
{
|
||
if (sp->state[IDX_CHAP] != STATE_CLOSED)
|
||
sppp_cp_change_state(&chap, sp, STATE_CLOSED);
|
||
}
|
||
|
||
static void
|
||
sppp_chap_TO(void *cookie)
|
||
{
|
||
struct sppp *sp = (struct sppp *)cookie;
|
||
STDDCL;
|
||
int s;
|
||
|
||
s = splimp();
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n",
|
||
SPP_ARGS(ifp),
|
||
sppp_state_name(sp->state[IDX_CHAP]),
|
||
sp->rst_counter[IDX_CHAP]);
|
||
|
||
if (--sp->rst_counter[IDX_CHAP] < 0)
|
||
/* TO- event */
|
||
switch (sp->state[IDX_CHAP]) {
|
||
case STATE_REQ_SENT:
|
||
chap.tld(sp);
|
||
sppp_cp_change_state(&chap, sp, STATE_CLOSED);
|
||
break;
|
||
}
|
||
else
|
||
/* TO+ (or TO*) event */
|
||
switch (sp->state[IDX_CHAP]) {
|
||
case STATE_OPENED:
|
||
/* TO* event */
|
||
sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
|
||
/* fall through */
|
||
case STATE_REQ_SENT:
|
||
chap.scr(sp);
|
||
/* sppp_cp_change_state() will restart the timer */
|
||
sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
|
||
break;
|
||
}
|
||
|
||
splx(s);
|
||
}
|
||
|
||
static void
|
||
sppp_chap_tlu(struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
int i, x;
|
||
|
||
i = 0;
|
||
sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
|
||
|
||
/*
|
||
* Some broken CHAP implementations (Conware CoNet, firmware
|
||
* 4.0.?) don't want to re-authenticate their CHAP once the
|
||
* initial challenge-response exchange has taken place.
|
||
* Provide for an option to avoid rechallenges.
|
||
*/
|
||
if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) {
|
||
/*
|
||
* Compute the re-challenge timeout. This will yield
|
||
* a number between 300 and 810 seconds.
|
||
*/
|
||
i = 300 + ((unsigned)(random() & 0xff00) >> 7);
|
||
TIMEOUT(chap.TO, (void *)sp, i * hz, sp->ch[IDX_CHAP]);
|
||
}
|
||
|
||
if (debug) {
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "chap %s, ",
|
||
SPP_ARGS(ifp),
|
||
sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu");
|
||
if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0)
|
||
addlog("next re-challenge in %d seconds\n", i);
|
||
else
|
||
addlog("re-challenging supressed\n");
|
||
}
|
||
|
||
x = splimp();
|
||
/* indicate to LCP that we need to be closed down */
|
||
sp->lcp.protos |= (1 << IDX_CHAP);
|
||
|
||
if (sp->pp_flags & PP_NEEDAUTH) {
|
||
/*
|
||
* Remote is authenticator, but his auth proto didn't
|
||
* complete yet. Defer the transition to network
|
||
* phase.
|
||
*/
|
||
splx(x);
|
||
return;
|
||
}
|
||
splx(x);
|
||
|
||
/*
|
||
* If we are already in phase network, we are done here. This
|
||
* is the case if this is a dummy tlu event after a re-challenge.
|
||
*/
|
||
if (sp->pp_phase != PHASE_NETWORK)
|
||
sppp_phase_network(sp);
|
||
}
|
||
|
||
static void
|
||
sppp_chap_tld(struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp));
|
||
UNTIMEOUT(chap.TO, (void *)sp, sp->ch[IDX_CHAP]);
|
||
sp->lcp.protos &= ~(1 << IDX_CHAP);
|
||
|
||
lcp.Close(sp);
|
||
}
|
||
|
||
static void
|
||
sppp_chap_scr(struct sppp *sp)
|
||
{
|
||
u_long *ch, seed;
|
||
u_char clen;
|
||
|
||
/* Compute random challenge. */
|
||
ch = (u_long *)sp->myauth.challenge;
|
||
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
||
read_random(&seed, sizeof seed);
|
||
#else
|
||
{
|
||
struct timeval tv;
|
||
microtime(&tv);
|
||
seed = tv.tv_sec ^ tv.tv_usec;
|
||
}
|
||
#endif
|
||
ch[0] = seed ^ random();
|
||
ch[1] = seed ^ random();
|
||
ch[2] = seed ^ random();
|
||
ch[3] = seed ^ random();
|
||
clen = AUTHKEYLEN;
|
||
|
||
sp->confid[IDX_CHAP] = ++sp->pp_seq;
|
||
|
||
sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
|
||
sizeof clen, (const char *)&clen,
|
||
(size_t)AUTHKEYLEN, sp->myauth.challenge,
|
||
(size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
|
||
sp->myauth.name,
|
||
0);
|
||
}
|
||
/*
|
||
*--------------------------------------------------------------------------*
|
||
* *
|
||
* The PAP implementation. *
|
||
* *
|
||
*--------------------------------------------------------------------------*
|
||
*/
|
||
/*
|
||
* For PAP, we need to keep a little state also if we are the peer, not the
|
||
* authenticator. This is since we don't get a request to authenticate, but
|
||
* have to repeatedly authenticate ourself until we got a response (or the
|
||
* retry counter is expired).
|
||
*/
|
||
|
||
/*
|
||
* Handle incoming PAP packets. */
|
||
static void
|
||
sppp_pap_input(struct sppp *sp, struct mbuf *m)
|
||
{
|
||
STDDCL;
|
||
struct lcp_header *h;
|
||
int len, x;
|
||
u_char *name, *passwd, mlen;
|
||
int name_len, passwd_len;
|
||
|
||
len = m->m_pkthdr.len;
|
||
if (len < 5) {
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
SPP_FMT "pap invalid packet length: %d bytes\n",
|
||
SPP_ARGS(ifp), len);
|
||
return;
|
||
}
|
||
h = mtod (m, struct lcp_header*);
|
||
if (len > ntohs (h->len))
|
||
len = ntohs (h->len);
|
||
switch (h->type) {
|
||
/* PAP request is my authproto */
|
||
case PAP_REQ:
|
||
name = 1 + (u_char*)(h+1);
|
||
name_len = name[-1];
|
||
passwd = name + name_len + 1;
|
||
if (name_len > len - 6 ||
|
||
(passwd_len = passwd[-1]) > len - 6 - name_len) {
|
||
if (debug) {
|
||
log(LOG_DEBUG, SPP_FMT "pap corrupted input "
|
||
"<%s id=0x%x len=%d",
|
||
SPP_ARGS(ifp),
|
||
sppp_auth_type_name(PPP_PAP, h->type),
|
||
h->ident, ntohs(h->len));
|
||
sppp_print_bytes((u_char*)(h+1), len-4);
|
||
addlog(">\n");
|
||
}
|
||
break;
|
||
}
|
||
if (debug) {
|
||
log(LOG_DEBUG, SPP_FMT "pap input(%s) "
|
||
"<%s id=0x%x len=%d name=",
|
||
SPP_ARGS(ifp),
|
||
sppp_state_name(sp->state[IDX_PAP]),
|
||
sppp_auth_type_name(PPP_PAP, h->type),
|
||
h->ident, ntohs(h->len));
|
||
sppp_print_string((char*)name, name_len);
|
||
addlog(" passwd=");
|
||
sppp_print_string((char*)passwd, passwd_len);
|
||
addlog(">\n");
|
||
}
|
||
if (name_len > AUTHNAMELEN ||
|
||
passwd_len > AUTHKEYLEN ||
|
||
bcmp(name, sp->hisauth.name, name_len) != 0 ||
|
||
bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) {
|
||
/* action scn, tld */
|
||
mlen = sizeof(FAILMSG) - 1;
|
||
sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
|
||
sizeof mlen, (const char *)&mlen,
|
||
sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
|
||
0);
|
||
pap.tld(sp);
|
||
break;
|
||
}
|
||
/* action sca, perhaps tlu */
|
||
if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
|
||
sp->state[IDX_PAP] == STATE_OPENED) {
|
||
mlen = sizeof(SUCCMSG) - 1;
|
||
sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
|
||
sizeof mlen, (const char *)&mlen,
|
||
sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
|
||
0);
|
||
}
|
||
if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
|
||
sppp_cp_change_state(&pap, sp, STATE_OPENED);
|
||
pap.tlu(sp);
|
||
}
|
||
break;
|
||
|
||
/* ack and nak are his authproto */
|
||
case PAP_ACK:
|
||
UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch);
|
||
if (debug) {
|
||
log(LOG_DEBUG, SPP_FMT "pap success",
|
||
SPP_ARGS(ifp));
|
||
name_len = *((char *)h);
|
||
if (len > 5 && name_len) {
|
||
addlog(": ");
|
||
sppp_print_string((char*)(h+1), name_len);
|
||
}
|
||
addlog("\n");
|
||
}
|
||
x = splimp();
|
||
sp->pp_flags &= ~PP_NEEDAUTH;
|
||
if (sp->myauth.proto == PPP_PAP &&
|
||
(sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
|
||
(sp->lcp.protos & (1 << IDX_PAP)) == 0) {
|
||
/*
|
||
* We are authenticator for PAP but didn't
|
||
* complete yet. Leave it to tlu to proceed
|
||
* to network phase.
|
||
*/
|
||
splx(x);
|
||
break;
|
||
}
|
||
splx(x);
|
||
sppp_phase_network(sp);
|
||
break;
|
||
|
||
case PAP_NAK:
|
||
UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch);
|
||
if (debug) {
|
||
log(LOG_INFO, SPP_FMT "pap failure",
|
||
SPP_ARGS(ifp));
|
||
name_len = *((char *)h);
|
||
if (len > 5 && name_len) {
|
||
addlog(": ");
|
||
sppp_print_string((char*)(h+1), name_len);
|
||
}
|
||
addlog("\n");
|
||
} else
|
||
log(LOG_INFO, SPP_FMT "pap failure\n",
|
||
SPP_ARGS(ifp));
|
||
/* await LCP shutdown by authenticator */
|
||
break;
|
||
|
||
default:
|
||
/* Unknown PAP packet type -- ignore. */
|
||
if (debug) {
|
||
log(LOG_DEBUG, SPP_FMT "pap corrupted input "
|
||
"<0x%x id=0x%x len=%d",
|
||
SPP_ARGS(ifp),
|
||
h->type, h->ident, ntohs(h->len));
|
||
sppp_print_bytes((u_char*)(h+1), len-4);
|
||
addlog(">\n");
|
||
}
|
||
break;
|
||
|
||
}
|
||
}
|
||
|
||
static void
|
||
sppp_pap_init(struct sppp *sp)
|
||
{
|
||
/* PAP doesn't have STATE_INITIAL at all. */
|
||
sp->state[IDX_PAP] = STATE_CLOSED;
|
||
sp->fail_counter[IDX_PAP] = 0;
|
||
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
||
callout_handle_init(&sp->ch[IDX_PAP]);
|
||
callout_handle_init(&sp->pap_my_to_ch);
|
||
#endif
|
||
}
|
||
|
||
static void
|
||
sppp_pap_open(struct sppp *sp)
|
||
{
|
||
if (sp->hisauth.proto == PPP_PAP &&
|
||
(sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
|
||
/* we are authenticator for PAP, start our timer */
|
||
sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
|
||
sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
|
||
}
|
||
if (sp->myauth.proto == PPP_PAP) {
|
||
/* we are peer, send a request, and start a timer */
|
||
pap.scr(sp);
|
||
TIMEOUT(sppp_pap_my_TO, (void *)sp, sp->lcp.timeout,
|
||
sp->pap_my_to_ch);
|
||
}
|
||
}
|
||
|
||
static void
|
||
sppp_pap_close(struct sppp *sp)
|
||
{
|
||
if (sp->state[IDX_PAP] != STATE_CLOSED)
|
||
sppp_cp_change_state(&pap, sp, STATE_CLOSED);
|
||
}
|
||
|
||
/*
|
||
* That's the timeout routine if we are authenticator. Since the
|
||
* authenticator is basically passive in PAP, we can't do much here.
|
||
*/
|
||
static void
|
||
sppp_pap_TO(void *cookie)
|
||
{
|
||
struct sppp *sp = (struct sppp *)cookie;
|
||
STDDCL;
|
||
int s;
|
||
|
||
s = splimp();
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n",
|
||
SPP_ARGS(ifp),
|
||
sppp_state_name(sp->state[IDX_PAP]),
|
||
sp->rst_counter[IDX_PAP]);
|
||
|
||
if (--sp->rst_counter[IDX_PAP] < 0)
|
||
/* TO- event */
|
||
switch (sp->state[IDX_PAP]) {
|
||
case STATE_REQ_SENT:
|
||
pap.tld(sp);
|
||
sppp_cp_change_state(&pap, sp, STATE_CLOSED);
|
||
break;
|
||
}
|
||
else
|
||
/* TO+ event, not very much we could do */
|
||
switch (sp->state[IDX_PAP]) {
|
||
case STATE_REQ_SENT:
|
||
/* sppp_cp_change_state() will restart the timer */
|
||
sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
|
||
break;
|
||
}
|
||
|
||
splx(s);
|
||
}
|
||
|
||
/*
|
||
* That's the timeout handler if we are peer. Since the peer is active,
|
||
* we need to retransmit our PAP request since it is apparently lost.
|
||
* XXX We should impose a max counter.
|
||
*/
|
||
static void
|
||
sppp_pap_my_TO(void *cookie)
|
||
{
|
||
struct sppp *sp = (struct sppp *)cookie;
|
||
STDDCL;
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "pap peer TO\n",
|
||
SPP_ARGS(ifp));
|
||
|
||
pap.scr(sp);
|
||
}
|
||
|
||
static void
|
||
sppp_pap_tlu(struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
int x;
|
||
|
||
sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "%s tlu\n",
|
||
SPP_ARGS(ifp), pap.name);
|
||
|
||
x = splimp();
|
||
/* indicate to LCP that we need to be closed down */
|
||
sp->lcp.protos |= (1 << IDX_PAP);
|
||
|
||
if (sp->pp_flags & PP_NEEDAUTH) {
|
||
/*
|
||
* Remote is authenticator, but his auth proto didn't
|
||
* complete yet. Defer the transition to network
|
||
* phase.
|
||
*/
|
||
splx(x);
|
||
return;
|
||
}
|
||
splx(x);
|
||
sppp_phase_network(sp);
|
||
}
|
||
|
||
static void
|
||
sppp_pap_tld(struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp));
|
||
UNTIMEOUT(pap.TO, (void *)sp, sp->ch[IDX_PAP]);
|
||
UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch);
|
||
sp->lcp.protos &= ~(1 << IDX_PAP);
|
||
|
||
lcp.Close(sp);
|
||
}
|
||
|
||
static void
|
||
sppp_pap_scr(struct sppp *sp)
|
||
{
|
||
u_char idlen, pwdlen;
|
||
|
||
sp->confid[IDX_PAP] = ++sp->pp_seq;
|
||
pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN);
|
||
idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN);
|
||
|
||
sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
|
||
sizeof idlen, (const char *)&idlen,
|
||
(size_t)idlen, sp->myauth.name,
|
||
sizeof pwdlen, (const char *)&pwdlen,
|
||
(size_t)pwdlen, sp->myauth.secret,
|
||
0);
|
||
}
|
||
/*
|
||
* Random miscellaneous functions.
|
||
*/
|
||
|
||
/*
|
||
* Send a PAP or CHAP proto packet.
|
||
*
|
||
* Varadic function, each of the elements for the ellipsis is of type
|
||
* ``size_t mlen, const u_char *msg''. Processing will stop iff
|
||
* mlen == 0.
|
||
* NOTE: never declare variadic functions with types subject to type
|
||
* promotion (i.e. u_char). This is asking for big trouble depending
|
||
* on the architecture you are on...
|
||
*/
|
||
|
||
static void
|
||
sppp_auth_send(const struct cp *cp, struct sppp *sp,
|
||
unsigned int type, unsigned int id,
|
||
...)
|
||
{
|
||
STDDCL;
|
||
struct ppp_header *h;
|
||
struct lcp_header *lh;
|
||
struct mbuf *m;
|
||
u_char *p;
|
||
int len;
|
||
unsigned int mlen;
|
||
const char *msg;
|
||
va_list ap;
|
||
|
||
MGETHDR (m, M_DONTWAIT, MT_DATA);
|
||
if (! m)
|
||
return;
|
||
m->m_pkthdr.rcvif = 0;
|
||
|
||
h = mtod (m, struct ppp_header*);
|
||
h->address = PPP_ALLSTATIONS; /* broadcast address */
|
||
h->control = PPP_UI; /* Unnumbered Info */
|
||
h->protocol = htons(cp->proto);
|
||
|
||
lh = (struct lcp_header*)(h + 1);
|
||
lh->type = type;
|
||
lh->ident = id;
|
||
p = (u_char*) (lh+1);
|
||
|
||
va_start(ap, id);
|
||
len = 0;
|
||
|
||
while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) {
|
||
msg = va_arg(ap, const char *);
|
||
len += mlen;
|
||
if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) {
|
||
va_end(ap);
|
||
m_freem(m);
|
||
return;
|
||
}
|
||
|
||
bcopy(msg, p, mlen);
|
||
p += mlen;
|
||
}
|
||
va_end(ap);
|
||
|
||
m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
|
||
lh->len = htons (LCP_HEADER_LEN + len);
|
||
|
||
if (debug) {
|
||
log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
|
||
SPP_ARGS(ifp), cp->name,
|
||
sppp_auth_type_name(cp->proto, lh->type),
|
||
lh->ident, ntohs(lh->len));
|
||
sppp_print_bytes((u_char*) (lh+1), len);
|
||
addlog(">\n");
|
||
}
|
||
if (IF_QFULL (&sp->pp_cpq)) {
|
||
IF_DROP (&sp->pp_fastq);
|
||
IF_DROP (&ifp->if_snd);
|
||
m_freem (m);
|
||
++ifp->if_oerrors;
|
||
} else
|
||
IF_ENQUEUE (&sp->pp_cpq, m);
|
||
if (! (ifp->if_flags & IFF_OACTIVE))
|
||
(*ifp->if_start) (ifp);
|
||
ifp->if_obytes += m->m_pkthdr.len + 3;
|
||
}
|
||
|
||
/*
|
||
* Flush interface queue.
|
||
*/
|
||
static void
|
||
sppp_qflush(struct ifqueue *ifq)
|
||
{
|
||
struct mbuf *m, *n;
|
||
|
||
n = ifq->ifq_head;
|
||
while ((m = n)) {
|
||
n = m->m_act;
|
||
m_freem (m);
|
||
}
|
||
ifq->ifq_head = 0;
|
||
ifq->ifq_tail = 0;
|
||
ifq->ifq_len = 0;
|
||
}
|
||
|
||
/*
|
||
* Send keepalive packets, every 10 seconds.
|
||
*/
|
||
static void
|
||
sppp_keepalive(void *dummy)
|
||
{
|
||
struct sppp *sp;
|
||
int s;
|
||
|
||
s = splimp();
|
||
for (sp=spppq; sp; sp=sp->pp_next) {
|
||
struct ifnet *ifp = &sp->pp_if;
|
||
|
||
/* Keepalive mode disabled or channel down? */
|
||
if (! (sp->pp_flags & PP_KEEPALIVE) ||
|
||
! (ifp->if_flags & IFF_RUNNING))
|
||
continue;
|
||
|
||
/* No keepalive in PPP mode if LCP not opened yet. */
|
||
if (! (sp->pp_flags & PP_CISCO) &&
|
||
sp->pp_phase < PHASE_AUTHENTICATE)
|
||
continue;
|
||
|
||
if (sp->pp_alivecnt == MAXALIVECNT) {
|
||
/* No keepalive packets got. Stop the interface. */
|
||
printf (SPP_FMT "down\n", SPP_ARGS(ifp));
|
||
if_down (ifp);
|
||
sppp_qflush (&sp->pp_cpq);
|
||
if (! (sp->pp_flags & PP_CISCO)) {
|
||
/* XXX */
|
||
/* Shut down the PPP link. */
|
||
lcp.Down(sp);
|
||
/* Initiate negotiation. XXX */
|
||
lcp.Up(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->pp_phase >= PHASE_AUTHENTICATE) {
|
||
long nmagic = htonl (sp->lcp.magic);
|
||
sp->lcp.echoid = ++sp->pp_seq;
|
||
sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
|
||
sp->lcp.echoid, 4, &nmagic);
|
||
}
|
||
}
|
||
splx(s);
|
||
TIMEOUT(sppp_keepalive, 0, hz * 10, keepalive_ch);
|
||
}
|
||
|
||
/*
|
||
* Get both IP addresses.
|
||
*/
|
||
static void
|
||
sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask)
|
||
{
|
||
struct ifnet *ifp = &sp->pp_if;
|
||
struct ifaddr *ifa;
|
||
struct sockaddr_in *si, *sm;
|
||
u_long ssrc, ddst;
|
||
|
||
sm = NULL;
|
||
ssrc = ddst = 0L;
|
||
/*
|
||
* Pick the first AF_INET address from the list,
|
||
* aliases don't make any sense on a p2p link anyway.
|
||
*/
|
||
si = 0;
|
||
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
||
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
|
||
#elif defined(__NetBSD__) || defined (__OpenBSD__)
|
||
for (ifa = ifp->if_addrlist.tqh_first;
|
||
ifa;
|
||
ifa = ifa->ifa_list.tqe_next)
|
||
#else
|
||
for (ifa = ifp->if_addrlist;
|
||
ifa;
|
||
ifa = ifa->ifa_next)
|
||
#endif
|
||
if (ifa->ifa_addr->sa_family == AF_INET) {
|
||
si = (struct sockaddr_in *)ifa->ifa_addr;
|
||
sm = (struct sockaddr_in *)ifa->ifa_netmask;
|
||
if (si)
|
||
break;
|
||
}
|
||
if (ifa) {
|
||
if (si && si->sin_addr.s_addr) {
|
||
ssrc = si->sin_addr.s_addr;
|
||
if (srcmask)
|
||
*srcmask = ntohl(sm->sin_addr.s_addr);
|
||
}
|
||
|
||
si = (struct sockaddr_in *)ifa->ifa_dstaddr;
|
||
if (si && si->sin_addr.s_addr)
|
||
ddst = si->sin_addr.s_addr;
|
||
}
|
||
|
||
if (dst) *dst = ntohl(ddst);
|
||
if (src) *src = ntohl(ssrc);
|
||
}
|
||
|
||
/*
|
||
* Set my IP address. Must be called at splimp.
|
||
*/
|
||
static void
|
||
sppp_set_ip_addr(struct sppp *sp, u_long src)
|
||
{
|
||
STDDCL;
|
||
struct ifaddr *ifa;
|
||
struct sockaddr_in *si;
|
||
|
||
/*
|
||
* Pick the first AF_INET address from the list,
|
||
* aliases don't make any sense on a p2p link anyway.
|
||
*/
|
||
si = 0;
|
||
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
||
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
|
||
#elif defined(__NetBSD__) || defined (__OpenBSD__)
|
||
for (ifa = ifp->if_addrlist.tqh_first;
|
||
ifa;
|
||
ifa = ifa->ifa_list.tqe_next)
|
||
#else
|
||
for (ifa = ifp->if_addrlist;
|
||
ifa;
|
||
ifa = ifa->ifa_next)
|
||
#endif
|
||
{
|
||
if (ifa->ifa_addr->sa_family == AF_INET)
|
||
{
|
||
si = (struct sockaddr_in *)ifa->ifa_addr;
|
||
if (si)
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (ifa && si)
|
||
{
|
||
int error;
|
||
#if __NetBSD_Version__ >= 103080000
|
||
struct sockaddr_in new_sin = *si;
|
||
|
||
new_sin.sin_addr.s_addr = htonl(src);
|
||
error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 1);
|
||
if(debug && error)
|
||
{
|
||
log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: in_ifinit "
|
||
" failed, error=%d\n", SPP_ARGS(ifp), error);
|
||
}
|
||
#else
|
||
/* delete old route */
|
||
error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST);
|
||
if(debug && error)
|
||
{
|
||
log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n",
|
||
SPP_ARGS(ifp), error);
|
||
}
|
||
|
||
/* set new address */
|
||
si->sin_addr.s_addr = htonl(src);
|
||
|
||
/* add new route */
|
||
error = rtinit(ifa, (int)RTM_ADD, RTF_HOST);
|
||
if (debug && error)
|
||
{
|
||
log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d",
|
||
SPP_ARGS(ifp), error);
|
||
}
|
||
#endif
|
||
}
|
||
}
|
||
|
||
static int
|
||
sppp_params(struct sppp *sp, u_long cmd, void *data)
|
||
{
|
||
u_long subcmd;
|
||
struct ifreq *ifr = (struct ifreq *)data;
|
||
struct spppreq spr;
|
||
|
||
/*
|
||
* ifr->ifr_data is supposed to point to a struct spppreq.
|
||
* Check the cmd word first before attempting to fetch all the
|
||
* data.
|
||
*/
|
||
if ((subcmd = fuword(ifr->ifr_data)) == -1)
|
||
return EFAULT;
|
||
|
||
if (copyin((caddr_t)ifr->ifr_data, &spr, sizeof spr) != 0)
|
||
return EFAULT;
|
||
|
||
switch (subcmd) {
|
||
case SPPPIOGDEFS:
|
||
if (cmd != SIOCGIFGENERIC)
|
||
return EINVAL;
|
||
/*
|
||
* We copy over the entire current state, but clean
|
||
* out some of the stuff we don't wanna pass up.
|
||
* Remember, SIOCGIFGENERIC is unprotected, and can be
|
||
* called by any user. No need to ever get PAP or
|
||
* CHAP secrets back to userland anyway.
|
||
*/
|
||
bcopy(sp, &spr.defs, sizeof(struct sppp));
|
||
bzero(spr.defs.myauth.secret, AUTHKEYLEN);
|
||
bzero(spr.defs.myauth.challenge, AUTHKEYLEN);
|
||
bzero(spr.defs.hisauth.secret, AUTHKEYLEN);
|
||
bzero(spr.defs.hisauth.challenge, AUTHKEYLEN);
|
||
return copyout(&spr, (caddr_t)ifr->ifr_data, sizeof spr);
|
||
|
||
case SPPPIOSDEFS:
|
||
if (cmd != SIOCSIFGENERIC)
|
||
return EINVAL;
|
||
/*
|
||
* We have a very specific idea of which fields we allow
|
||
* being passed back from userland, so to not clobber our
|
||
* current state. For one, we only allow setting
|
||
* anything if LCP is in dead phase. Once the LCP
|
||
* negotiations started, the authentication settings must
|
||
* not be changed again. (The administrator can force an
|
||
* ifconfig down in order to get LCP back into dead
|
||
* phase.)
|
||
*
|
||
* Also, we only allow for authentication parameters to be
|
||
* specified.
|
||
*
|
||
* XXX Should allow to set or clear pp_flags.
|
||
*
|
||
* Finally, if the respective authentication protocol to
|
||
* be used is set differently than 0, but the secret is
|
||
* passed as all zeros, we don't trash the existing secret.
|
||
* This allows an administrator to change the system name
|
||
* only without clobbering the secret (which he didn't get
|
||
* back in a previous SPPPIOGDEFS call). However, the
|
||
* secrets are cleared if the authentication protocol is
|
||
* reset to 0.
|
||
*/
|
||
if (sp->pp_phase != PHASE_DEAD)
|
||
return EBUSY;
|
||
|
||
if ((spr.defs.myauth.proto != 0 && spr.defs.myauth.proto != PPP_PAP &&
|
||
spr.defs.myauth.proto != PPP_CHAP) ||
|
||
(spr.defs.hisauth.proto != 0 && spr.defs.hisauth.proto != PPP_PAP &&
|
||
spr.defs.hisauth.proto != PPP_CHAP))
|
||
return EINVAL;
|
||
|
||
if (spr.defs.myauth.proto == 0)
|
||
/* resetting myauth */
|
||
bzero(&sp->myauth, sizeof sp->myauth);
|
||
else {
|
||
/* setting/changing myauth */
|
||
sp->myauth.proto = spr.defs.myauth.proto;
|
||
bcopy(spr.defs.myauth.name, sp->myauth.name, AUTHNAMELEN);
|
||
if (spr.defs.myauth.secret[0] != '\0')
|
||
bcopy(spr.defs.myauth.secret, sp->myauth.secret,
|
||
AUTHKEYLEN);
|
||
}
|
||
if (spr.defs.hisauth.proto == 0)
|
||
/* resetting hisauth */
|
||
bzero(&sp->hisauth, sizeof sp->hisauth);
|
||
else {
|
||
/* setting/changing hisauth */
|
||
sp->hisauth.proto = spr.defs.hisauth.proto;
|
||
sp->hisauth.flags = spr.defs.hisauth.flags;
|
||
bcopy(spr.defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN);
|
||
if (spr.defs.hisauth.secret[0] != '\0')
|
||
bcopy(spr.defs.hisauth.secret, sp->hisauth.secret,
|
||
AUTHKEYLEN);
|
||
}
|
||
break;
|
||
|
||
default:
|
||
return EINVAL;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
sppp_phase_network(struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
int i;
|
||
u_long mask;
|
||
|
||
sp->pp_phase = PHASE_NETWORK;
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
|
||
sppp_phase_name(sp->pp_phase));
|
||
|
||
/* Notify NCPs now. */
|
||
for (i = 0; i < IDX_COUNT; i++)
|
||
if ((cps[i])->flags & CP_NCP)
|
||
(cps[i])->Open(sp);
|
||
|
||
/* Send Up events to all NCPs. */
|
||
for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
|
||
if (sp->lcp.protos & mask && ((cps[i])->flags & CP_NCP))
|
||
(cps[i])->Up(sp);
|
||
|
||
/* if no NCP is starting, all this was in vain, close down */
|
||
sppp_lcp_check_and_close(sp);
|
||
}
|
||
|
||
|
||
static const char *
|
||
sppp_cp_type_name(u_char type)
|
||
{
|
||
static char buf[12];
|
||
switch (type) {
|
||
case CONF_REQ: return "conf-req";
|
||
case CONF_ACK: return "conf-ack";
|
||
case CONF_NAK: return "conf-nak";
|
||
case CONF_REJ: return "conf-rej";
|
||
case TERM_REQ: return "term-req";
|
||
case TERM_ACK: return "term-ack";
|
||
case CODE_REJ: return "code-rej";
|
||
case PROTO_REJ: return "proto-rej";
|
||
case ECHO_REQ: return "echo-req";
|
||
case ECHO_REPLY: return "echo-reply";
|
||
case DISC_REQ: return "discard-req";
|
||
}
|
||
snprintf (buf, sizeof(buf), "cp/0x%x", type);
|
||
return buf;
|
||
}
|
||
|
||
static const char *
|
||
sppp_auth_type_name(u_short proto, u_char type)
|
||
{
|
||
static char buf[12];
|
||
switch (proto) {
|
||
case PPP_CHAP:
|
||
switch (type) {
|
||
case CHAP_CHALLENGE: return "challenge";
|
||
case CHAP_RESPONSE: return "response";
|
||
case CHAP_SUCCESS: return "success";
|
||
case CHAP_FAILURE: return "failure";
|
||
}
|
||
case PPP_PAP:
|
||
switch (type) {
|
||
case PAP_REQ: return "req";
|
||
case PAP_ACK: return "ack";
|
||
case PAP_NAK: return "nak";
|
||
}
|
||
}
|
||
snprintf (buf, sizeof(buf), "auth/0x%x", type);
|
||
return buf;
|
||
}
|
||
|
||
static const char *
|
||
sppp_lcp_opt_name(u_char opt)
|
||
{
|
||
static char buf[12];
|
||
switch (opt) {
|
||
case LCP_OPT_MRU: return "mru";
|
||
case LCP_OPT_ASYNC_MAP: return "async-map";
|
||
case LCP_OPT_AUTH_PROTO: return "auth-proto";
|
||
case LCP_OPT_QUAL_PROTO: return "qual-proto";
|
||
case LCP_OPT_MAGIC: return "magic";
|
||
case LCP_OPT_PROTO_COMP: return "proto-comp";
|
||
case LCP_OPT_ADDR_COMP: return "addr-comp";
|
||
}
|
||
snprintf (buf, sizeof(buf), "lcp/0x%x", opt);
|
||
return buf;
|
||
}
|
||
|
||
static const char *
|
||
sppp_ipcp_opt_name(u_char opt)
|
||
{
|
||
static char buf[12];
|
||
switch (opt) {
|
||
case IPCP_OPT_ADDRESSES: return "addresses";
|
||
case IPCP_OPT_COMPRESSION: return "compression";
|
||
case IPCP_OPT_ADDRESS: return "address";
|
||
}
|
||
snprintf (buf, sizeof(buf), "ipcp/0x%x", opt);
|
||
return buf;
|
||
}
|
||
|
||
static const char *
|
||
sppp_state_name(int state)
|
||
{
|
||
switch (state) {
|
||
case STATE_INITIAL: return "initial";
|
||
case STATE_STARTING: return "starting";
|
||
case STATE_CLOSED: return "closed";
|
||
case STATE_STOPPED: return "stopped";
|
||
case STATE_CLOSING: return "closing";
|
||
case STATE_STOPPING: return "stopping";
|
||
case STATE_REQ_SENT: return "req-sent";
|
||
case STATE_ACK_RCVD: return "ack-rcvd";
|
||
case STATE_ACK_SENT: return "ack-sent";
|
||
case STATE_OPENED: return "opened";
|
||
}
|
||
return "illegal";
|
||
}
|
||
|
||
static const char *
|
||
sppp_phase_name(enum ppp_phase phase)
|
||
{
|
||
switch (phase) {
|
||
case PHASE_DEAD: return "dead";
|
||
case PHASE_ESTABLISH: return "establish";
|
||
case PHASE_TERMINATE: return "terminate";
|
||
case PHASE_AUTHENTICATE: return "authenticate";
|
||
case PHASE_NETWORK: return "network";
|
||
}
|
||
return "illegal";
|
||
}
|
||
|
||
static const char *
|
||
sppp_proto_name(u_short proto)
|
||
{
|
||
static char buf[12];
|
||
switch (proto) {
|
||
case PPP_LCP: return "lcp";
|
||
case PPP_IPCP: return "ipcp";
|
||
case PPP_PAP: return "pap";
|
||
case PPP_CHAP: return "chap";
|
||
}
|
||
snprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto);
|
||
return buf;
|
||
}
|
||
|
||
static void
|
||
sppp_print_bytes(const u_char *p, u_short len)
|
||
{
|
||
if (len)
|
||
addlog(" %*D", len, p, "-");
|
||
}
|
||
|
||
static void
|
||
sppp_print_string(const char *p, u_short len)
|
||
{
|
||
u_char c;
|
||
|
||
while (len-- > 0) {
|
||
c = *p++;
|
||
/*
|
||
* Print only ASCII chars directly. RFC 1994 recommends
|
||
* using only them, but we don't rely on it. */
|
||
if (c < ' ' || c > '~')
|
||
addlog("\\x%x", c);
|
||
else
|
||
addlog("%c", c);
|
||
}
|
||
}
|
||
|
||
static const char *
|
||
sppp_dotted_quad(u_long addr)
|
||
{
|
||
static char s[16];
|
||
sprintf(s, "%d.%d.%d.%d",
|
||
(int)((addr >> 24) & 0xff),
|
||
(int)((addr >> 16) & 0xff),
|
||
(int)((addr >> 8) & 0xff),
|
||
(int)(addr & 0xff));
|
||
return s;
|
||
}
|
||
|
||
static int
|
||
sppp_strnlen(u_char *p, int max)
|
||
{
|
||
int len;
|
||
|
||
for (len = 0; len < max && *p; ++p)
|
||
++len;
|
||
return len;
|
||
}
|
||
|
||
/* a dummy, used to drop uninteresting events */
|
||
static void
|
||
sppp_null(struct sppp *unused)
|
||
{
|
||
/* do just nothing */
|
||
}
|