2756 lines
66 KiB
C
2756 lines
66 KiB
C
/*
|
||
* Synchronous PPP/Cisco link level subroutines.
|
||
* Keepalive protocol implemented in both Cisco and PPP modes.
|
||
*
|
||
* Copyright (C) 1994 Cronyx 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.
|
||
*
|
||
* Authors grant any other persons or organisations permission to use
|
||
* or modify this software as long as this message is kept with the software,
|
||
* all derivative works or modified versions.
|
||
*
|
||
* From: Version 1.9, Wed Oct 4 18:58:15 MSK 1995
|
||
*
|
||
* $Id: if_spppsubr.c,v 1.25 1997/08/12 05:22:54 kjc Exp $
|
||
*/
|
||
|
||
#include <sys/param.h>
|
||
#include <sys/systm.h>
|
||
#include <sys/kernel.h>
|
||
#include <sys/sockio.h>
|
||
#include <sys/socket.h>
|
||
#include <sys/syslog.h>
|
||
#include <sys/malloc.h>
|
||
#include <sys/mbuf.h>
|
||
|
||
#include <net/if.h>
|
||
#include <net/netisr.h>
|
||
#include <net/if_types.h>
|
||
|
||
#ifdef INET
|
||
#include <netinet/in.h>
|
||
#include <netinet/in_systm.h>
|
||
#include <netinet/in_var.h>
|
||
#include <netinet/ip.h>
|
||
#include <netinet/tcp.h>
|
||
#include <netinet/if_ether.h>
|
||
#endif
|
||
|
||
#ifdef IPX
|
||
#include <netipx/ipx.h>
|
||
#include <netipx/ipx_if.h>
|
||
#endif
|
||
|
||
#ifdef NS
|
||
#include <netns/ns.h>
|
||
#include <netns/ns_if.h>
|
||
#endif
|
||
|
||
#ifdef ISO
|
||
#include <netiso/argo_debug.h>
|
||
#include <netiso/iso.h>
|
||
#include <netiso/iso_var.h>
|
||
#include <netiso/iso_snpac.h>
|
||
#endif
|
||
|
||
#include <net/if_sppp.h>
|
||
|
||
#define MAXALIVECNT 3 /* max. alive packets */
|
||
|
||
/*
|
||
* Interface flags that can be set in an ifconfig command.
|
||
*
|
||
* Setting link0 will make the link passive, i.e. it will be marked
|
||
* as being administrative openable, but won't be opened to begin
|
||
* with. Incoming calls will be answered, or subsequent calls with
|
||
* -link1 will cause the administrative open of the LCP layer.
|
||
*
|
||
* Setting link1 will cause the link to auto-dial only as packets
|
||
* arrive to be sent.
|
||
*/
|
||
|
||
#define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
|
||
#define IFF_AUTO IFF_LINK1 /* auto-dial on output */
|
||
|
||
#define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
|
||
#define PPP_UI 0x03 /* Unnumbered Information */
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||
#define PPP_IP 0x0021 /* Internet Protocol */
|
||
#define PPP_ISO 0x0023 /* ISO OSI Protocol */
|
||
#define PPP_XNS 0x0025 /* Xerox NS Protocol */
|
||
#define PPP_IPX 0x002b /* Novell IPX Protocol */
|
||
#define PPP_LCP 0xc021 /* Link Control Protocol */
|
||
#define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */
|
||
|
||
#define CONF_REQ 1 /* PPP configure request */
|
||
#define CONF_ACK 2 /* PPP configure acknowledge */
|
||
#define CONF_NAK 3 /* PPP configure negative ack */
|
||
#define CONF_REJ 4 /* PPP configure reject */
|
||
#define TERM_REQ 5 /* PPP terminate request */
|
||
#define TERM_ACK 6 /* PPP terminate acknowledge */
|
||
#define CODE_REJ 7 /* PPP code reject */
|
||
#define PROTO_REJ 8 /* PPP protocol reject */
|
||
#define ECHO_REQ 9 /* PPP echo request */
|
||
#define ECHO_REPLY 10 /* PPP echo reply */
|
||
#define DISC_REQ 11 /* PPP discard request */
|
||
|
||
#define LCP_OPT_MRU 1 /* maximum receive unit */
|
||
#define LCP_OPT_ASYNC_MAP 2 /* async control character map */
|
||
#define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */
|
||
#define LCP_OPT_QUAL_PROTO 4 /* quality protocol */
|
||
#define LCP_OPT_MAGIC 5 /* magic number */
|
||
#define LCP_OPT_RESERVED 6 /* reserved */
|
||
#define LCP_OPT_PROTO_COMP 7 /* protocol field compression */
|
||
#define LCP_OPT_ADDR_COMP 8 /* address/control field compression */
|
||
|
||
#define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */
|
||
#define IPCP_OPT_COMPRESSION 2 /* IP compression protocol (VJ) */
|
||
#define IPCP_OPT_ADDRESS 3 /* local IP address */
|
||
|
||
#define CISCO_MULTICAST 0x8f /* Cisco multicast address */
|
||
#define CISCO_UNICAST 0x0f /* Cisco unicast address */
|
||
#define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
|
||
#define CISCO_ADDR_REQ 0 /* Cisco address request */
|
||
#define CISCO_ADDR_REPLY 1 /* Cisco address reply */
|
||
#define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
|
||
|
||
/* states are named and numbered according to RFC 1661 */
|
||
#define STATE_INITIAL 0
|
||
#define STATE_STARTING 1
|
||
#define STATE_CLOSED 2
|
||
#define STATE_STOPPED 3
|
||
#define STATE_CLOSING 4
|
||
#define STATE_STOPPING 5
|
||
#define STATE_REQ_SENT 6
|
||
#define STATE_ACK_RCVD 7
|
||
#define STATE_ACK_SENT 8
|
||
#define STATE_OPENED 9
|
||
|
||
struct ppp_header {
|
||
u_char address;
|
||
u_char control;
|
||
u_short protocol;
|
||
};
|
||
#define PPP_HEADER_LEN sizeof (struct ppp_header)
|
||
|
||
struct lcp_header {
|
||
u_char type;
|
||
u_char ident;
|
||
u_short len;
|
||
};
|
||
#define LCP_HEADER_LEN sizeof (struct lcp_header)
|
||
|
||
struct cisco_packet {
|
||
u_long type;
|
||
u_long par1;
|
||
u_long par2;
|
||
u_short rel;
|
||
u_short time0;
|
||
u_short time1;
|
||
};
|
||
#define CISCO_PACKET_LEN 18
|
||
|
||
/*
|
||
* 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
|
||
* explain the semantics related to the various events and actions.
|
||
*/
|
||
struct cp {
|
||
u_short proto; /* PPP control protocol number */
|
||
u_char protoidx; /* index into state table in struct sppp */
|
||
u_char flags;
|
||
#define CP_LCP 0x01 /* this is the LCP */
|
||
#define CP_AUTH 0x02 /* this is an authentication protocol */
|
||
#define CP_NCP 0x04 /* this is a NCP */
|
||
#define CP_QUAL 0x08 /* this is a quality reporting protocol */
|
||
const char *name; /* name of this control protocol */
|
||
/* event handlers */
|
||
void (*Up)(struct sppp *sp);
|
||
void (*Down)(struct sppp *sp);
|
||
void (*Open)(struct sppp *sp);
|
||
void (*Close)(struct sppp *sp);
|
||
void (*TO)(void *sp);
|
||
int (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
|
||
void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
|
||
void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
|
||
/* actions */
|
||
void (*tlu)(struct sppp *sp);
|
||
void (*tld)(struct sppp *sp);
|
||
void (*tls)(struct sppp *sp);
|
||
void (*tlf)(struct sppp *sp);
|
||
void (*scr)(struct sppp *sp);
|
||
};
|
||
|
||
static struct sppp *spppq;
|
||
|
||
/*
|
||
* The following disgusting hack gets around the problem that IP TOS
|
||
* can't be set yet. We want to put "interactive" traffic on a high
|
||
* priority queue. To decide if traffic is interactive, we check that
|
||
* a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
|
||
*/
|
||
static u_short interactive_ports[8] = {
|
||
0, 513, 0, 0,
|
||
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_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_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(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 const char *sppp_cp_type_name(u_char type);
|
||
static const char *sppp_lcp_opt_name(u_char opt);
|
||
static const char *sppp_ipcp_opt_name(u_char opt);
|
||
static const char *sppp_state_name(int state);
|
||
static const char *sppp_phase_name(enum ppp_phase phase);
|
||
static const char *sppp_proto_name(u_short proto);
|
||
|
||
static void sppp_keepalive(void *dummy);
|
||
static void sppp_qflush(struct ifqueue *ifq);
|
||
|
||
static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst);
|
||
static void sppp_set_ip_addr(struct sppp *sp, u_long src);
|
||
|
||
static void sppp_print_bytes(u_char *p, u_short len);
|
||
|
||
/* our control protocol descriptors */
|
||
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
|
||
};
|
||
|
||
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
|
||
};
|
||
|
||
const struct cp *cps[IDX_COUNT] = {
|
||
&lcp, /* IDX_LCP */
|
||
&ipcp, /* IDX_IPCP */
|
||
};
|
||
|
||
|
||
/*
|
||
* 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,
|
||
"%s%d: input packet is too small, %d bytes\n",
|
||
ifp->if_name, ifp->if_unit, 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,
|
||
"%s%d: PPP packet in Cisco mode "
|
||
"<addr=0x%x ctrl=0x%x proto=0x%x>\n",
|
||
ifp->if_name, ifp->if_unit,
|
||
h->address, h->control, ntohs(h->protocol));
|
||
goto drop;
|
||
}
|
||
switch (ntohs (h->protocol)) {
|
||
default:
|
||
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);
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
"%s%d: invalid input protocol "
|
||
"<addr=0x%x ctrl=0x%x proto=0x%x>\n",
|
||
ifp->if_name, ifp->if_unit,
|
||
h->address, h->control, ntohs(h->protocol));
|
||
++ifp->if_noproto;
|
||
goto drop;
|
||
case PPP_LCP:
|
||
sppp_cp_input(&lcp, (struct sppp*)ifp, m);
|
||
m_freem (m);
|
||
return;
|
||
#ifdef INET
|
||
case PPP_IPCP:
|
||
if (sp->pp_phase == PHASE_NETWORK)
|
||
sppp_cp_input(&ipcp, (struct sppp*) ifp, 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,
|
||
"%s%d: Cisco packet in PPP mode "
|
||
"<addr=0x%x ctrl=0x%x proto=0x%x>\n",
|
||
ifp->if_name, ifp->if_unit,
|
||
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,
|
||
"%s%d: invalid input packet "
|
||
"<addr=0x%x ctrl=0x%x proto=0x%x>\n",
|
||
ifp->if_name, ifp->if_unit,
|
||
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, "%s%d: protocol queue overflow\n",
|
||
ifp->if_name, ifp->if_unit);
|
||
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;
|
||
|
||
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
|
||
/*
|
||
* Put low delay, telnet, rlogin and ftp control packets
|
||
* in front of the queue.
|
||
*/
|
||
if (dst->sa_family == AF_INET) {
|
||
struct ip *ip = mtod (m, struct ip*);
|
||
struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
|
||
|
||
if (! IF_QFULL (&sp->pp_fastq) &&
|
||
((ip->ip_tos & IPTOS_LOWDELAY) ||
|
||
ip->ip_p == IPPROTO_TCP &&
|
||
m->m_len >= sizeof (struct ip) + sizeof (struct tcphdr) &&
|
||
(INTERACTIVE (ntohs (tcp->th_sport)) ||
|
||
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 (ifp->if_flags & IFF_DEBUG)
|
||
log(LOG_DEBUG, "%s%d: no memory for transmit header\n",
|
||
ifp->if_name, ifp->if_unit);
|
||
++ifp->if_oerrors;
|
||
splx (s);
|
||
return (ENOBUFS);
|
||
}
|
||
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);
|
||
|
||
/* Insert new entry into the keepalive list. */
|
||
sp->pp_next = spppq;
|
||
spppq = sp;
|
||
|
||
sp->pp_if.if_type = IFT_PPP;
|
||
sp->pp_if.if_output = sppp_output;
|
||
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);
|
||
}
|
||
|
||
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);
|
||
|
||
for (i = 0; i < IDX_COUNT; i++)
|
||
untimeout((cps[i])->TO, (void *)sp);
|
||
}
|
||
|
||
/*
|
||
* 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 are in
|
||
* network phase.
|
||
*
|
||
* XXX Network phase itself is still not a sufficient test, we
|
||
* normally should keep a separate queue for each supported
|
||
* protocol family, and only serve these queues as the
|
||
* respective NCPs were opened. The simplistic logic used
|
||
* here might cause some loss of network traffic while the
|
||
* NCPs are being negotiated, in particular if the NCPs take a
|
||
* long time to negotiate.
|
||
*
|
||
* Do always serve all three queues in Cisco mode.
|
||
*/
|
||
IF_DEQUEUE(&sp->pp_cpq, m);
|
||
if (m == NULL &&
|
||
(sp->pp_phase == PHASE_NETWORK ||
|
||
(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;
|
||
}
|
||
|
||
/*
|
||
* Process an ioctl request. Called on low priority level.
|
||
*/
|
||
int
|
||
sppp_ioctl(struct ifnet *ifp, int cmd, void *data)
|
||
{
|
||
struct ifreq *ifr = (struct ifreq*) data;
|
||
struct sppp *sp = (struct sppp*) ifp;
|
||
int s, going_up, going_down, newmode;
|
||
|
||
s = splimp();
|
||
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;
|
||
|
||
default:
|
||
splx(s);
|
||
return (ENOTTY);
|
||
}
|
||
splx(s);
|
||
return (0);
|
||
}
|
||
|
||
|
||
/*
|
||
* 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;
|
||
struct ifaddr *ifa;
|
||
|
||
if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
"%s%d: invalid cisco packet length: %d bytes\n",
|
||
ifp->if_name, ifp->if_unit, m->m_pkthdr.len);
|
||
return;
|
||
}
|
||
h = mtod (m, struct cisco_packet*);
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
"%s%d: cisco input: %d bytes "
|
||
"<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
|
||
ifp->if_name, ifp->if_unit, m->m_pkthdr.len,
|
||
ntohl (h->type), h->par1, h->par2, h->rel,
|
||
h->time0, h->time1);
|
||
switch (ntohl (h->type)) {
|
||
default:
|
||
if (debug)
|
||
addlog("%s%d: unknown cisco packet type: 0x%lx\n",
|
||
ifp->if_name, ifp->if_unit, 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 ("%s%d: loopback\n",
|
||
ifp->if_name, ifp->if_unit);
|
||
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 */
|
||
sp->pp_seq ^= time.tv_sec ^ time.tv_usec;
|
||
break;
|
||
}
|
||
sp->pp_loopcnt = 0;
|
||
if (! (ifp->if_flags & IFF_UP) &&
|
||
(ifp->if_flags & IFF_RUNNING)) {
|
||
ifp->if_flags |= IFF_UP;
|
||
printf ("%s%d: up\n", ifp->if_name, ifp->if_unit);
|
||
}
|
||
break;
|
||
case CISCO_ADDR_REQ:
|
||
for (ifa=ifp->if_addrhead.tqh_first; ifa;
|
||
ifa=ifa->ifa_link.tqe_next)
|
||
if (ifa->ifa_addr->sa_family == AF_INET)
|
||
break;
|
||
if (! ifa) {
|
||
if (debug)
|
||
addlog("%s%d: unknown address for cisco request\n",
|
||
ifp->if_name, ifp->if_unit);
|
||
return;
|
||
}
|
||
sppp_cisco_send (sp, CISCO_ADDR_REPLY,
|
||
ntohl (((struct sockaddr_in*)ifa->ifa_addr)->sin_addr.s_addr),
|
||
ntohl (((struct sockaddr_in*)ifa->ifa_netmask)->sin_addr.s_addr));
|
||
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;
|
||
u_long t = (time.tv_sec - boottime.tv_sec) * 1000;
|
||
|
||
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;
|
||
ch->time0 = htons ((u_short) (t >> 16));
|
||
ch->time1 = htons ((u_short) t);
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
"%s%d: cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
|
||
ifp->if_name, ifp->if_unit, ntohl (ch->type), ch->par1,
|
||
ch->par2, ch->rel, ch->time0, 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, "%s%d: %s output <%s id=0x%x len=%d",
|
||
ifp->if_name, ifp->if_unit,
|
||
sppp_proto_name(proto),
|
||
sppp_cp_type_name (lh->type), lh->ident,
|
||
ntohs (lh->len));
|
||
if (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,
|
||
"%s%d: %s invalid packet length: %d bytes\n",
|
||
ifp->if_name, ifp->if_unit, cp->name, len);
|
||
return;
|
||
}
|
||
h = mtod (m, struct lcp_header*);
|
||
if (debug) {
|
||
log(LOG_DEBUG,
|
||
"%s%d: %s input(%s): <%s id=0x%x len=%d",
|
||
ifp->if_name, ifp->if_unit, cp->name,
|
||
sppp_state_name(sp->state[cp->protoidx]),
|
||
sppp_cp_type_name (h->type), h->ident, ntohs (h->len));
|
||
if (len > 4)
|
||
sppp_print_bytes ((u_char*) (h+1), len-4);
|
||
addlog(">\n");
|
||
}
|
||
if (len > ntohs (h->len))
|
||
len = ntohs (h->len);
|
||
switch (h->type) {
|
||
case CONF_REQ:
|
||
if (len < 4) {
|
||
if (debug)
|
||
addlog("%s%d: %s invalid conf-req length %d\n",
|
||
ifp->if_name, ifp->if_unit, cp->name,
|
||
len);
|
||
++ifp->if_ierrors;
|
||
break;
|
||
}
|
||
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_CLOSING:
|
||
case STATE_STOPPING:
|
||
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_CLOSED:
|
||
sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
|
||
0, 0);
|
||
break;
|
||
case STATE_ACK_RCVD:
|
||
if (rv) {
|
||
sppp_cp_change_state(cp, sp, STATE_OPENED);
|
||
if (debug)
|
||
log(LOG_DEBUG, "%s%d: %s tlu\n",
|
||
ifp->if_name, ifp->if_unit,
|
||
cp->name);
|
||
(cp->tlu)(sp);
|
||
} else
|
||
sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
|
||
break;
|
||
default:
|
||
printf("%s%d: %s illegal %s in state %s\n",
|
||
ifp->if_name, ifp->if_unit, 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("%s%d: %s id mismatch 0x%x != 0x%x\n",
|
||
ifp->if_name, ifp->if_unit, 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)
|
||
addlog("%s%d: %s tlu\n",
|
||
ifp->if_name, ifp->if_unit, cp->name);
|
||
(cp->tlu)(sp);
|
||
break;
|
||
default:
|
||
printf("%s%d: %s illegal %s in state %s\n",
|
||
ifp->if_name, ifp->if_unit, 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("%s%d: %s id mismatch 0x%x != 0x%x\n",
|
||
ifp->if_name, ifp->if_unit, 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("%s%d: %s illegal %s in state %s\n",
|
||
ifp->if_name, ifp->if_unit, 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, "%s%d: %s send terminate-ack\n",
|
||
ifp->if_name, ifp->if_unit, 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("%s%d: %s illegal %s in state %s\n",
|
||
ifp->if_name, ifp->if_unit, 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:
|
||
(cp->tlf)(sp);
|
||
sppp_cp_change_state(cp, sp, STATE_CLOSED);
|
||
break;
|
||
case STATE_STOPPING:
|
||
(cp->tlf)(sp);
|
||
sppp_cp_change_state(cp, sp, STATE_STOPPED);
|
||
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("%s%d: %s illegal %s in state %s\n",
|
||
ifp->if_name, ifp->if_unit, 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. */
|
||
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("%s%d: %s illegal %s in state %s\n",
|
||
ifp->if_name, ifp->if_unit, 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("%s%d: lcp echo req but lcp closed\n",
|
||
ifp->if_name, ifp->if_unit);
|
||
++ifp->if_ierrors;
|
||
break;
|
||
}
|
||
if (len < 8) {
|
||
if (debug)
|
||
addlog("%s%d: invalid lcp echo request "
|
||
"packet length: %d bytes\n",
|
||
ifp->if_name, ifp->if_unit, len);
|
||
break;
|
||
}
|
||
if (ntohl (*(long*)(h+1)) == sp->lcp.magic) {
|
||
/* Line loopback mode detected. */
|
||
printf("%s%d: loopback\n", ifp->if_name, ifp->if_unit);
|
||
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("%s%d: got lcp echo req, sending echo rep\n",
|
||
ifp->if_name, ifp->if_unit);
|
||
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("%s%d: lcp invalid echo reply "
|
||
"packet length: %d bytes\n",
|
||
ifp->if_name, ifp->if_unit, len);
|
||
break;
|
||
}
|
||
if (debug)
|
||
addlog("%s%d: lcp got echo rep\n",
|
||
ifp->if_name, ifp->if_unit);
|
||
if (ntohl (*(long*)(h+1)) != sp->lcp.magic)
|
||
sp->pp_alivecnt = 0;
|
||
break;
|
||
default:
|
||
/* Unknown packet type -- send Code-Reject packet. */
|
||
illegal:
|
||
if (debug)
|
||
addlog("%s%d: %c send code-rej for 0x%x\n",
|
||
ifp->if_name, ifp->if_unit, 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, "%s%d: %s up(%s)\n",
|
||
ifp->if_name, ifp->if_unit, 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("%s%d: %s illegal up in state %s\n",
|
||
ifp->if_name, ifp->if_unit, 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, "%s%d: %s down(%s)\n",
|
||
ifp->if_name, ifp->if_unit, 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:
|
||
(cp->tls)(sp);
|
||
/* fall through */
|
||
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("%s%d: %s illegal down in state %s\n",
|
||
ifp->if_name, ifp->if_unit, 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, "%s%d: %s open(%s)\n",
|
||
ifp->if_name, ifp->if_unit, cp->name,
|
||
sppp_state_name(sp->state[cp->protoidx]));
|
||
|
||
switch (sp->state[cp->protoidx]) {
|
||
case STATE_INITIAL:
|
||
(cp->tls)(sp);
|
||
sppp_cp_change_state(cp, sp, STATE_STARTING);
|
||
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, "%s%d: %s close(%s)\n",
|
||
ifp->if_name, ifp->if_unit, 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:
|
||
(cp->tlf)(sp);
|
||
sppp_cp_change_state(cp, sp, STATE_INITIAL);
|
||
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, "%s%d: %s TO(%s) rst_counter = %d\n",
|
||
ifp->if_name, ifp->if_unit, 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:
|
||
(cp->tlf)(sp);
|
||
sppp_cp_change_state(cp, sp, STATE_CLOSED);
|
||
break;
|
||
case STATE_STOPPING:
|
||
(cp->tlf)(sp);
|
||
sppp_cp_change_state(cp, sp, STATE_STOPPED);
|
||
break;
|
||
case STATE_REQ_SENT:
|
||
case STATE_ACK_RCVD:
|
||
case STATE_ACK_SENT:
|
||
(cp->tlf)(sp);
|
||
sppp_cp_change_state(cp, sp, STATE_STOPPED);
|
||
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);
|
||
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);
|
||
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);
|
||
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);
|
||
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;
|
||
|
||
/*
|
||
* Initialize counters and timeout values. Note that we don't
|
||
* use the 3 seconds suggested in RFC 1661 since we are likely
|
||
* running on a fast link. XXX We should probably implement
|
||
* the exponential backoff option. Note that these values are
|
||
* relevant for all control protocols, not just LCP only.
|
||
*/
|
||
sp->lcp.timeout = 1 * hz;
|
||
sp->lcp.max_terminate = 2;
|
||
sp->lcp.max_configure = 10;
|
||
sp->lcp.max_failure = 10;
|
||
}
|
||
|
||
static void
|
||
sppp_lcp_up(struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
|
||
/*
|
||
* If this interface is passive or dial-on-demand, it means
|
||
* we've got in incoming call. Activate the interface.
|
||
*/
|
||
if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
"%s%d: Up event (incoming call)\n",
|
||
ifp->if_name, ifp->if_unit);
|
||
ifp->if_flags |= IFF_RUNNING;
|
||
lcp.Open(sp);
|
||
}
|
||
|
||
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,
|
||
"%s%d: Down event (carrier loss), taking interface down.\n",
|
||
ifp->if_name, ifp->if_unit);
|
||
if_down(ifp);
|
||
} else {
|
||
if (debug)
|
||
log(LOG_DEBUG,
|
||
"%s%d: Down event (carrier loss)\n",
|
||
ifp->if_name, ifp->if_unit);
|
||
}
|
||
lcp.Close(sp);
|
||
ifp->if_flags &= ~IFF_RUNNING;
|
||
}
|
||
|
||
static void
|
||
sppp_lcp_open(struct sppp *sp)
|
||
{
|
||
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;
|
||
|
||
len -= 4;
|
||
origlen = len;
|
||
buf = r = malloc (len, M_TEMP, M_NOWAIT);
|
||
if (! buf)
|
||
return (0);
|
||
|
||
if (debug)
|
||
log(LOG_DEBUG, "%s%d: lcp parse opts: ",
|
||
ifp->if_name, ifp->if_unit);
|
||
|
||
/* 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;
|
||
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, "%s%d: lcp parse opt values: ",
|
||
ifp->if_name, ifp->if_unit);
|
||
|
||
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%x ", nmagic);
|
||
continue;
|
||
}
|
||
/*
|
||
* Local and remote magics equal -- loopback?
|
||
*/
|
||
if (sp->pp_loopcnt >= MAXALIVECNT*5) {
|
||
printf ("\n%s%d: loopback\n",
|
||
ifp->if_name, ifp->if_unit);
|
||
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("%d ", sp->lcp.their_mru);
|
||
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, "%s%d: lcp rej opts: ",
|
||
ifp->if_name, ifp->if_unit);
|
||
|
||
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;
|
||
}
|
||
}
|
||
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, "%s%d: lcp nak opts: ",
|
||
ifp->if_name, ifp->if_unit);
|
||
|
||
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 ");
|
||
sp->lcp.magic += time.tv_sec + time.tv_usec;
|
||
} else {
|
||
sp->lcp.magic = magic;
|
||
if (debug)
|
||
addlog("%d ");
|
||
}
|
||
}
|
||
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;
|
||
}
|
||
}
|
||
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 ("%s%d: up\n", ifp->if_name, ifp->if_unit);
|
||
}
|
||
|
||
for (i = 0; i < IDX_COUNT; i++)
|
||
if ((cps[i])->flags & CP_QUAL)
|
||
(cps[i])->Open(sp);
|
||
|
||
if (/* require authentication XXX */ 0)
|
||
sp->pp_phase = PHASE_AUTHENTICATE;
|
||
else
|
||
sp->pp_phase = PHASE_NETWORK;
|
||
|
||
log(LOG_INFO, "%s%d: phase %s\n", ifp->if_name, ifp->if_unit,
|
||
sppp_phase_name(sp->pp_phase));
|
||
|
||
if (sp->pp_phase == PHASE_AUTHENTICATE) {
|
||
for (i = 0; i < IDX_COUNT; i++)
|
||
if ((cps[i])->flags & CP_AUTH)
|
||
(cps[i])->Open(sp);
|
||
} else {
|
||
/* 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);
|
||
|
||
if (sp->pp_phase == PHASE_NETWORK)
|
||
/* if no NCP is starting, close down */
|
||
sppp_lcp_check(sp);
|
||
}
|
||
|
||
static void
|
||
sppp_lcp_tld(struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
int i;
|
||
u_long mask;
|
||
|
||
sp->pp_phase = PHASE_TERMINATE;
|
||
|
||
log(LOG_INFO, "%s%d: phase %s\n", ifp->if_name, ifp->if_unit,
|
||
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;
|
||
|
||
log(LOG_INFO, "%s%d: phase %s\n", ifp->if_name, ifp->if_unit,
|
||
sppp_phase_name(sp->pp_phase));
|
||
|
||
/* Notify lower layer if desired. */
|
||
if (sp->pp_tls)
|
||
(sp->pp_tls)(sp);
|
||
}
|
||
|
||
static void
|
||
sppp_lcp_tlf(struct sppp *sp)
|
||
{
|
||
STDDCL;
|
||
|
||
sp->pp_phase = PHASE_DEAD;
|
||
log(LOG_INFO, "%s%d: phase %s\n", ifp->if_name, ifp->if_unit,
|
||
sppp_phase_name(sp->pp_phase));
|
||
|
||
/* Notify lower layer if desired. */
|
||
if (sp->pp_tlf)
|
||
(sp->pp_tlf)(sp);
|
||
}
|
||
|
||
static void
|
||
sppp_lcp_scr(struct sppp *sp)
|
||
{
|
||
char opt[6 /* magicnum */ + 4 /* mru */];
|
||
int i = 0;
|
||
|
||
if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
|
||
if (! sp->lcp.magic)
|
||
sp->lcp.magic = time.tv_sec + time.tv_usec;
|
||
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;
|
||
}
|
||
|
||
sp->confid[IDX_LCP] = ++sp->pp_seq;
|
||
sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
|
||
}
|
||
|
||
/*
|
||
* 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(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;
|
||
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;
|
||
}
|
||
|
||
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;
|
||
|
||
sppp_get_ip_addrs(sp, &myaddr, &hisaddr);
|
||
/*
|
||
* 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, "%s%d: ipcp_open(): no IP interface\n",
|
||
ifp->if_name, ifp->if_unit);
|
||
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);
|
||
}
|
||
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;
|
||
|
||
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, "%s%d: ipcp parse opts: ",
|
||
ifp->if_name, ifp->if_unit);
|
||
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) {
|
||
#ifdef notyet
|
||
case IPCP_OPT_COMPRESSION:
|
||
if (len >= 6 && p[1] >= 6) {
|
||
/* correctly formed compress option */
|
||
continue;
|
||
}
|
||
if (debug)
|
||
addlog("[invalid] ");
|
||
break;
|
||
#endif
|
||
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);
|
||
if (debug)
|
||
addlog("%s%d: ipcp parse opt values: ", ifp->if_name, ifp->if_unit);
|
||
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) {
|
||
#ifdef notyet
|
||
case IPCP_OPT_COMPRESSION:
|
||
continue;
|
||
#endif
|
||
case IPCP_OPT_ADDRESS:
|
||
desiredaddr = p[2] << 24 | p[3] << 16 |
|
||
p[4] << 8 | p[5];
|
||
if (desiredaddr == hisaddr) {
|
||
/*
|
||
* Peer's address is same as our value,
|
||
* this is agreeable. Gonna conf-ack
|
||
* it.
|
||
*/
|
||
if (debug)
|
||
addlog("0x%x [ack] ", 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.
|
||
*/
|
||
if (debug) {
|
||
if (desiredaddr == 0)
|
||
addlog("[addr requested] ");
|
||
else
|
||
addlog("0x%x [not agreed] ",
|
||
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)) {
|
||
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, "%s%d: ipcp rej opts: ",
|
||
ifp->if_name, ifp->if_unit);
|
||
|
||
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?
|
||
*/
|
||
sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
|
||
break;
|
||
#ifdef notyet
|
||
case IPCP_OPT_COMPRESS:
|
||
sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS);
|
||
break;
|
||
#endif
|
||
}
|
||
}
|
||
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, "%s%d: ipcp nak opts: ",
|
||
ifp->if_name, ifp->if_unit);
|
||
|
||
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 0x%x] ", wantaddr);
|
||
/*
|
||
* When doing dynamic address assignment,
|
||
* we accept his offer. Otherwise, we
|
||
* ignore it and thus continue to negotiate
|
||
* our already existing value.
|
||
*/
|
||
if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
|
||
sppp_set_ip_addr(sp, wantaddr);
|
||
if (debug)
|
||
addlog("[agree] ");
|
||
}
|
||
}
|
||
break;
|
||
#ifdef notyet
|
||
case IPCP_OPT_COMPRESS:
|
||
/*
|
||
* Peer wants different compression parameters.
|
||
*/
|
||
break;
|
||
#endif
|
||
}
|
||
}
|
||
if (debug)
|
||
addlog("\n");
|
||
free (buf, M_TEMP);
|
||
return;
|
||
}
|
||
|
||
static void
|
||
sppp_ipcp_tlu(struct sppp *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(sp);
|
||
}
|
||
|
||
static void
|
||
sppp_ipcp_scr(struct sppp *sp)
|
||
{
|
||
char opt[6 /* compression */ + 6 /* address */];
|
||
u_long ouraddr;
|
||
int i = 0;
|
||
|
||
#ifdef notyet
|
||
if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
|
||
opt[i++] = IPCP_OPT_COMPRESSION;
|
||
opt[i++] = 6;
|
||
opt[i++] = 0; /* VJ header compression */
|
||
opt[i++] = 0x2d; /* VJ header compression */
|
||
opt[i++] = max_slot_id;
|
||
opt[i++] = comp_slot_id;
|
||
}
|
||
#endif
|
||
|
||
if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
|
||
sppp_get_ip_addrs(sp, &ouraddr, 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);
|
||
}
|
||
|
||
|
||
/*
|
||
* Random miscellaneous functions.
|
||
*/
|
||
|
||
/*
|
||
* 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 ("%s%d: down\n", ifp->if_name, ifp->if_unit);
|
||
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);
|
||
}
|
||
|
||
/*
|
||
* Get both IP addresses.
|
||
*/
|
||
static void
|
||
sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst)
|
||
{
|
||
struct ifnet *ifp = &sp->pp_if;
|
||
struct ifaddr *ifa;
|
||
struct sockaddr_in *si;
|
||
u_long ssrc, ddst;
|
||
|
||
ssrc = ddst = 0L;
|
||
/*
|
||
* Pick the first AF_INET address from the list,
|
||
* aliases don't make any sense on a p2p link anyway.
|
||
*/
|
||
for (ifa = ifp->if_addrhead.tqh_first, si = 0;
|
||
ifa;
|
||
ifa = ifa->ifa_link.tqe_next)
|
||
if (ifa->ifa_addr->sa_family == AF_INET) {
|
||
si = (struct sockaddr_in *)ifa->ifa_addr;
|
||
if (si)
|
||
break;
|
||
}
|
||
if (ifa) {
|
||
if (si && si->sin_addr.s_addr)
|
||
ssrc = si->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)
|
||
{
|
||
struct ifnet *ifp = &sp->pp_if;
|
||
struct ifaddr *ifa;
|
||
struct sockaddr_in *si;
|
||
u_long ssrc, ddst;
|
||
|
||
/*
|
||
* Pick the first AF_INET address from the list,
|
||
* aliases don't make any sense on a p2p link anyway.
|
||
*/
|
||
for (ifa = ifp->if_addrhead.tqh_first, si = 0;
|
||
ifa;
|
||
ifa = ifa->ifa_link.tqe_next)
|
||
if (ifa->ifa_addr->sa_family == AF_INET) {
|
||
si = (struct sockaddr_in *)ifa->ifa_addr;
|
||
if (si)
|
||
break;
|
||
}
|
||
if (ifa && si)
|
||
si->sin_addr.s_addr = htonl(src);
|
||
}
|
||
|
||
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");
|
||
}
|
||
sprintf (buf, "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");
|
||
}
|
||
sprintf (buf, "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");
|
||
}
|
||
sprintf (buf, "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";
|
||
}
|
||
sprintf(buf, "0x%x", (unsigned)proto);
|
||
return buf;
|
||
}
|
||
|
||
static void
|
||
sppp_print_bytes(u_char *p, u_short len)
|
||
{
|
||
addlog(" %x", *p++);
|
||
while (--len > 0)
|
||
addlog("-%x", *p++);
|
||
}
|
||
|
||
/*
|
||
* This file is large. Tell emacs to highlight it nevertheless.
|
||
*
|
||
* Local Variables:
|
||
* hilit-auto-highlight-maxout: 100000
|
||
* End:
|
||
*/
|