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c4846f2d74
freebsd-dev/sys/net/if_spppsubr.c
kjc fe67d29e8e Fix a traceroute problem in the CISCO HDLC mode. (cisco routers not 
returning ICMP_TIMXCEED)

use CISCO_UNICAST instead of CISCO_MULTICAST to send normal packets.
this is needed for packets to get processed by a cisco router,
but doesn't matter if a packet is just forwarded.

Reviewed by:itojun@itojun.org
1997-08-12 05:22:54 +00:00

2755 lines
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/*
* 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 1.24 1997/08/10 14:28:16 joerg 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/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 */
#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:
*/
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