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HardenedBSD/usr.sbin/ppp/ipv6cp.c
Warner Losh b3e7694832 Remove $FreeBSD$: two-line .h pattern 
Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/
2023-08-16 11:54:16 -06:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2001 Brian Somers <brian@Awfulhak.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <sys/socket.h>
#include <net/route.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_dl.h>
#include <sys/un.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <ifaddrs.h>
#include "layer.h"
#include "defs.h"
#include "mbuf.h"
#include "timer.h"
#include "fsm.h"
#include "iplist.h"
#include "throughput.h"
#include "slcompress.h"
#include "lqr.h"
#include "hdlc.h"
#include "lcp.h"
#include "ncpaddr.h"
#include "ip.h"
#include "ipcp.h"
#include "ipv6cp.h"
#include "filter.h"
#include "descriptor.h"
#include "ccp.h"
#include "link.h"
#include "mp.h"
#ifndef NORADIUS
#include "radius.h"
#endif
#include "ncp.h"
#include "bundle.h"
#include "route.h"
#include "iface.h"
#include "log.h"
#include "proto.h"
#include "command.h"
#include "prompt.h"
#include "async.h"
#include "physical.h"
#include "probe.h"
#include "systems.h"
#ifndef NOINET6
#define IN6ADDR_LINKLOCAL_MCAST_INIT \
{{{ 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }}}
static const struct in6_addr in6addr_linklocal_mcast =
IN6ADDR_LINKLOCAL_MCAST_INIT;
static int ipv6cp_LayerUp(struct fsm *);
static void ipv6cp_LayerDown(struct fsm *);
static void ipv6cp_LayerStart(struct fsm *);
static void ipv6cp_LayerFinish(struct fsm *);
static void ipv6cp_InitRestartCounter(struct fsm *, int);
static void ipv6cp_SendConfigReq(struct fsm *);
static void ipv6cp_SentTerminateReq(struct fsm *);
static void ipv6cp_SendTerminateAck(struct fsm *, u_char);
static void ipv6cp_DecodeConfig(struct fsm *, u_char *, u_char *, int,
struct fsm_decode *);
static struct fsm_callbacks ipv6cp_Callbacks = {
ipv6cp_LayerUp,
ipv6cp_LayerDown,
ipv6cp_LayerStart,
ipv6cp_LayerFinish,
ipv6cp_InitRestartCounter,
ipv6cp_SendConfigReq,
ipv6cp_SentTerminateReq,
ipv6cp_SendTerminateAck,
ipv6cp_DecodeConfig,
fsm_NullRecvResetReq,
fsm_NullRecvResetAck
};
static void
SetInterfaceID(u_char *ifid, int userandom)
{
struct ifaddrs *ifa, *ifap = NULL;
struct sockaddr_dl *sdl;
const u_long i32_max = 0xffffffff;
u_long r1, r2;
/* configure an interface ID based on Section 4.1 of RFC 2472 */
memset(ifid, 0, IPV6CP_IFIDLEN);
/*
* 1) If an IEEE global identifier (EUI-48 or EUI-64) is
* available anywhere on the node, it should be used to construct
* the tentative Interface-Identifier due to its uniqueness
* properties.
*/
if (userandom)
goto randomid;
if (getifaddrs(&ifap) < 0)
goto randomid;
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
char *cp;
if (ifa->ifa_addr->sa_family != AF_LINK)
continue;
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
if (sdl->sdl_alen < 6)
continue;
/* we're only interested in IEEE hardware addresses */
switch(sdl->sdl_type) {
case IFT_ETHER:
case IFT_FDDI:
case IFT_L2VLAN:
/* XXX need more cases? */
break;
default:
continue;
}
cp = (char *)(sdl->sdl_data + sdl->sdl_nlen);
ifid[0] = cp[0];
ifid[0] ^= 0x02; /* reverse the u/l bit*/
ifid[1] = cp[1];
ifid[2] = cp[2];
ifid[3] = 0xff;
ifid[4] = 0xfe;
ifid[5] = cp[3];
ifid[6] = cp[4];
ifid[7] = cp[5];
freeifaddrs(ifap);
return;
}
freeifaddrs(ifap);
/*
* 2) If an IEEE global identifier is not available a different source
* of uniqueness should be used.
* XXX: we skip this case.
*/
/*
* 3) If a good source of uniqueness cannot be found, it is
* recommended that a random number be generated. In this case the
* "u" bit of the interface identifier MUST be set to zero (0).
*/
randomid:
randinit();
r1 = (((u_long)random()) % i32_max) + 1;
r2 = (((u_long)random()) % i32_max) + 1;
memcpy(ifid, &r1, sizeof(r1));
memcpy(ifid + 4, &r2, sizeof(r2));
ifid[0] &= 0xfd;
return;
}
static int
ipcp_SetIPv6address(struct ipv6cp *ipv6cp, u_char *myifid, u_char *hisifid)
{
struct bundle *bundle = ipv6cp->fsm.bundle;
struct in6_addr myaddr, hisaddr;
struct ncprange myrange, range;
struct ncpaddr addr;
struct sockaddr_storage ssdst, ssgw, ssmask;
struct sockaddr *sadst, *sagw, *samask;
sadst = (struct sockaddr *)&ssdst;
sagw = (struct sockaddr *)&ssgw;
samask = (struct sockaddr *)&ssmask;
memset(&myaddr, '\0', sizeof myaddr);
memset(&hisaddr, '\0', sizeof hisaddr);
myaddr.s6_addr[0] = 0xfe;
myaddr.s6_addr[1] = 0x80;
memcpy(&myaddr.s6_addr[8], myifid, IPV6CP_IFIDLEN);
#if 0
myaddr.s6_addr[8] |= 0x02; /* set 'universal' bit */
#endif
hisaddr.s6_addr[0] = 0xfe;
hisaddr.s6_addr[1] = 0x80;
memcpy(&hisaddr.s6_addr[8], hisifid, IPV6CP_IFIDLEN);
#if 0
hisaddr.s6_addr[8] |= 0x02; /* set 'universal' bit */
#endif
ncpaddr_setip6(&ipv6cp->myaddr, &myaddr);
ncpaddr_setip6(&ipv6cp->hisaddr, &hisaddr);
ncprange_set(&myrange, &ipv6cp->myaddr, 64);
if (!iface_Add(bundle->iface, &bundle->ncp, &myrange, &ipv6cp->hisaddr,
IFACE_ADD_FIRST|IFACE_FORCE_ADD|IFACE_SYSTEM))
return 0;
if (!Enabled(bundle, OPT_IFACEALIAS))
iface_Clear(bundle->iface, &bundle->ncp, AF_INET6,
IFACE_CLEAR_ALIASES|IFACE_SYSTEM);
ncpaddr_setip6(&addr, &in6addr_linklocal_mcast);
ncprange_set(&range, &addr, 32);
rt_Set(bundle, RTM_ADD, &range, &ipv6cp->myaddr, 1, 0);
if (bundle->ncp.cfg.sendpipe > 0 || bundle->ncp.cfg.recvpipe > 0) {
ncprange_getsa(&myrange, &ssgw, &ssmask);
if (ncpaddr_isset(&ipv6cp->hisaddr))
ncpaddr_getsa(&ipv6cp->hisaddr, &ssdst);
else
sadst = NULL;
rt_Update(bundle, sadst, sagw, samask, NULL, NULL);
}
if (Enabled(bundle, OPT_SROUTES))
route_Change(bundle, bundle->ncp.route, &ipv6cp->myaddr, &ipv6cp->hisaddr);
#ifndef NORADIUS
if (bundle->radius.valid)
route_Change(bundle, bundle->radius.ipv6routes, &ipv6cp->myaddr,
&ipv6cp->hisaddr);
#endif
return 1; /* Ok */
}
void
ipv6cp_Init(struct ipv6cp *ipv6cp, struct bundle *bundle, struct link *l,
const struct fsm_parent *parent)
{
static const char * const timer_names[] =
{"IPV6CP restart", "IPV6CP openmode", "IPV6CP stopped"};
int n;
fsm_Init(&ipv6cp->fsm, "IPV6CP", PROTO_IPV6CP, 1, IPV6CP_MAXCODE, LogIPV6CP,
bundle, l, parent, &ipv6cp_Callbacks, timer_names);
ipv6cp->cfg.fsm.timeout = DEF_FSMRETRY;
ipv6cp->cfg.fsm.maxreq = DEF_FSMTRIES;
ipv6cp->cfg.fsm.maxtrm = DEF_FSMTRIES;
SetInterfaceID(ipv6cp->my_ifid, 0);
do {
SetInterfaceID(ipv6cp->his_ifid, 1);
} while (memcmp(ipv6cp->his_ifid, ipv6cp->my_ifid, IPV6CP_IFIDLEN) == 0);
if (probe.ipv6_available) {
n = 100;
while (n &&
!ipcp_SetIPv6address(ipv6cp, ipv6cp->my_ifid, ipv6cp->his_ifid)) {
do {
n--;
SetInterfaceID(ipv6cp->my_ifid, 1);
} while (n
&& memcmp(ipv6cp->his_ifid, ipv6cp->my_ifid, IPV6CP_IFIDLEN) == 0);
}
}
throughput_init(&ipv6cp->throughput, SAMPLE_PERIOD);
memset(ipv6cp->Queue, '\0', sizeof ipv6cp->Queue);
ipv6cp_Setup(ipv6cp);
}
void
ipv6cp_Destroy(struct ipv6cp *ipv6cp)
{
throughput_destroy(&ipv6cp->throughput);
}
void
ipv6cp_Setup(struct ipv6cp *ipv6cp)
{
ncpaddr_init(&ipv6cp->myaddr);
ncpaddr_init(&ipv6cp->hisaddr);
ipv6cp->his_reject = 0;
ipv6cp->my_reject = 0;
}
void
ipv6cp_SetLink(struct ipv6cp *ipv6cp, struct link *l)
{
ipv6cp->fsm.link = l;
}
int
ipv6cp_Show(struct cmdargs const *arg)
{
struct ipv6cp *ipv6cp = &arg->bundle->ncp.ipv6cp;
prompt_Printf(arg->prompt, "%s [%s]\n", ipv6cp->fsm.name,
State2Nam(ipv6cp->fsm.state));
if (ipv6cp->fsm.state == ST_OPENED) {
prompt_Printf(arg->prompt, " His side: %s\n",
ncpaddr_ntoa(&ipv6cp->hisaddr));
prompt_Printf(arg->prompt, " My side: %s\n",
ncpaddr_ntoa(&ipv6cp->myaddr));
prompt_Printf(arg->prompt, " Queued packets: %lu\n",
(unsigned long)ipv6cp_QueueLen(ipv6cp));
}
prompt_Printf(arg->prompt, "\nDefaults:\n");
prompt_Printf(arg->prompt, " FSM retry = %us, max %u Config"
" REQ%s, %u Term REQ%s\n\n", ipv6cp->cfg.fsm.timeout,
ipv6cp->cfg.fsm.maxreq, ipv6cp->cfg.fsm.maxreq == 1 ? "" : "s",
ipv6cp->cfg.fsm.maxtrm, ipv6cp->cfg.fsm.maxtrm == 1 ? "" : "s");
throughput_disp(&ipv6cp->throughput, arg->prompt);
return 0;
}
struct mbuf *
ipv6cp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp)
{
/* Got PROTO_IPV6CP from link */
m_settype(bp, MB_IPV6CPIN);
if (bundle_Phase(bundle) == PHASE_NETWORK)
fsm_Input(&bundle->ncp.ipv6cp.fsm, bp);
else {
if (bundle_Phase(bundle) < PHASE_NETWORK)
log_Printf(LogIPV6CP, "%s: Error: Unexpected IPV6CP in phase %s"
" (ignored)\n", l->name, bundle_PhaseName(bundle));
m_freem(bp);
}
return NULL;
}
void
ipv6cp_AddInOctets(struct ipv6cp *ipv6cp, int n)
{
throughput_addin(&ipv6cp->throughput, n);
}
void
ipv6cp_AddOutOctets(struct ipv6cp *ipv6cp, int n)
{
throughput_addout(&ipv6cp->throughput, n);
}
void
ipv6cp_IfaceAddrAdded(struct ipv6cp *ipv6cp __unused,
const struct iface_addr *addr __unused)
{
}
void
ipv6cp_IfaceAddrDeleted(struct ipv6cp *ipv6cp __unused,
const struct iface_addr *addr __unused)
{
}
int
ipv6cp_InterfaceUp(struct ipv6cp *ipv6cp)
{
if (!ipcp_SetIPv6address(ipv6cp, ipv6cp->my_ifid, ipv6cp->his_ifid)) {
log_Printf(LogERROR, "ipv6cp_InterfaceUp: unable to set ipv6 address\n");
return 0;
}
if (!iface_SetFlags(ipv6cp->fsm.bundle->iface->name, IFF_UP)) {
log_Printf(LogERROR, "ipv6cp_InterfaceUp: Can't set the IFF_UP"
" flag on %s\n", ipv6cp->fsm.bundle->iface->name);
return 0;
}
return 1;
}
size_t
ipv6cp_QueueLen(struct ipv6cp *ipv6cp)
{
struct mqueue *q;
size_t result;
result = 0;
for (q = ipv6cp->Queue; q < ipv6cp->Queue + IPV6CP_QUEUES(ipv6cp); q++)
result += q->len;
return result;
}
int
ipv6cp_PushPacket(struct ipv6cp *ipv6cp, struct link *l)
{
struct bundle *bundle = ipv6cp->fsm.bundle;
struct mqueue *queue;
struct mbuf *bp;
int m_len;
u_int32_t secs = 0;
unsigned alivesecs = 0;
if (ipv6cp->fsm.state != ST_OPENED)
return 0;
/*
* If ccp is not open but is required, do nothing.
*/
if (l->ccp.fsm.state != ST_OPENED && ccp_Required(&l->ccp)) {
log_Printf(LogPHASE, "%s: Not transmitting... waiting for CCP\n", l->name);
return 0;
}
queue = ipv6cp->Queue + IPV6CP_QUEUES(ipv6cp) - 1;
do {
if (queue->top) {
bp = m_dequeue(queue);
bp = mbuf_Read(bp, &secs, sizeof secs);
bp = m_pullup(bp);
m_len = m_length(bp);
if (!FilterCheck(MBUF_CTOP(bp), AF_INET6, &bundle->filter.alive,
&alivesecs)) {
if (secs == 0)
secs = alivesecs;
bundle_StartIdleTimer(bundle, secs);
}
link_PushPacket(l, bp, bundle, 0, PROTO_IPV6);
ipv6cp_AddOutOctets(ipv6cp, m_len);
return 1;
}
} while (queue-- != ipv6cp->Queue);
return 0;
}
static int
ipv6cp_LayerUp(struct fsm *fp)
{
/* We're now up */
struct ipv6cp *ipv6cp = fsm2ipv6cp(fp);
char tbuff[NCP_ASCIIBUFFERSIZE];
log_Printf(LogIPV6CP, "%s: LayerUp.\n", fp->link->name);
if (!ipv6cp_InterfaceUp(ipv6cp))
return 0;
snprintf(tbuff, sizeof tbuff, "%s", ncpaddr_ntoa(&ipv6cp->myaddr));
log_Printf(LogIPV6CP, "myaddr %s hisaddr = %s\n",
tbuff, ncpaddr_ntoa(&ipv6cp->hisaddr));
#ifndef NORADIUS
radius_Account_Set_Ipv6(&fp->bundle->radacct6, ipv6cp->his_ifid);
radius_Account(&fp->bundle->radius, &fp->bundle->radacct6,
fp->bundle->links, RAD_START, &ipv6cp->throughput);
/*
* XXX: Avoid duplicate evaluation of filterid between IPCP and
* IPV6CP. When IPCP is enabled and rejected, filterid is not
* evaluated.
*/
if (!Enabled(fp->bundle, OPT_IPCP)) {
if (*fp->bundle->radius.cfg.file && fp->bundle->radius.filterid)
system_Select(fp->bundle, fp->bundle->radius.filterid, LINKUPFILE,
NULL, NULL);
}
#endif
/*
* XXX this stuff should really live in the FSM. Our config should
* associate executable sections in files with events.
*/
if (system_Select(fp->bundle, tbuff, LINKUPFILE, NULL, NULL) < 0) {
/*
* XXX: Avoid duplicate evaluation of label between IPCP and
* IPV6CP. When IPCP is enabled and rejected, label is not
* evaluated.
*/
if (bundle_GetLabel(fp->bundle) && !Enabled(fp->bundle, OPT_IPCP)) {
if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle),
LINKUPFILE, NULL, NULL) < 0)
system_Select(fp->bundle, "MYADDR6", LINKUPFILE, NULL, NULL);
} else
system_Select(fp->bundle, "MYADDR6", LINKUPFILE, NULL, NULL);
}
fp->more.reqs = fp->more.naks = fp->more.rejs = ipv6cp->cfg.fsm.maxreq * 3;
log_DisplayPrompts();
return 1;
}
static void
ipv6cp_LayerDown(struct fsm *fp)
{
/* About to come down */
struct ipv6cp *ipv6cp = fsm2ipv6cp(fp);
static int recursing;
char addr[NCP_ASCIIBUFFERSIZE];
if (!recursing++) {
snprintf(addr, sizeof addr, "%s", ncpaddr_ntoa(&ipv6cp->myaddr));
log_Printf(LogIPV6CP, "%s: LayerDown: %s\n", fp->link->name, addr);
#ifndef NORADIUS
radius_Flush(&fp->bundle->radius);
radius_Account(&fp->bundle->radius, &fp->bundle->radacct6,
fp->bundle->links, RAD_STOP, &ipv6cp->throughput);
/*
* XXX: Avoid duplicate evaluation of filterid between IPCP and
* IPV6CP. When IPCP is enabled and rejected, filterid is not
* evaluated.
*/
if (!Enabled(fp->bundle, OPT_IPCP)) {
if (*fp->bundle->radius.cfg.file && fp->bundle->radius.filterid)
system_Select(fp->bundle, fp->bundle->radius.filterid, LINKDOWNFILE,
NULL, NULL);
}
#endif
/*
* XXX this stuff should really live in the FSM. Our config should
* associate executable sections in files with events.
*/
if (system_Select(fp->bundle, addr, LINKDOWNFILE, NULL, NULL) < 0) {
/*
* XXX: Avoid duplicate evaluation of label between IPCP and
* IPV6CP. When IPCP is enabled and rejected, label is not
* evaluated.
*/
if (bundle_GetLabel(fp->bundle) && !Enabled(fp->bundle, OPT_IPCP)) {
if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle),
LINKDOWNFILE, NULL, NULL) < 0)
system_Select(fp->bundle, "MYADDR6", LINKDOWNFILE, NULL, NULL);
} else
system_Select(fp->bundle, "MYADDR6", LINKDOWNFILE, NULL, NULL);
}
ipv6cp_Setup(ipv6cp);
}
recursing--;
}
static void
ipv6cp_LayerStart(struct fsm *fp)
{
/* We're about to start up ! */
struct ipv6cp *ipv6cp = fsm2ipv6cp(fp);
log_Printf(LogIPV6CP, "%s: LayerStart.\n", fp->link->name);
throughput_start(&ipv6cp->throughput, "IPV6CP throughput",
Enabled(fp->bundle, OPT_THROUGHPUT));
fp->more.reqs = fp->more.naks = fp->more.rejs = ipv6cp->cfg.fsm.maxreq * 3;
ipv6cp->peer_tokenreq = 0;
}
static void
ipv6cp_LayerFinish(struct fsm *fp)
{
/* We're now down */
struct ipv6cp *ipv6cp = fsm2ipv6cp(fp);
log_Printf(LogIPV6CP, "%s: LayerFinish.\n", fp->link->name);
throughput_stop(&ipv6cp->throughput);
throughput_log(&ipv6cp->throughput, LogIPV6CP, NULL);
}
static void
ipv6cp_InitRestartCounter(struct fsm *fp, int what)
{
/* Set fsm timer load */
struct ipv6cp *ipv6cp = fsm2ipv6cp(fp);
fp->FsmTimer.load = ipv6cp->cfg.fsm.timeout * SECTICKS;
switch (what) {
case FSM_REQ_TIMER:
fp->restart = ipv6cp->cfg.fsm.maxreq;
break;
case FSM_TRM_TIMER:
fp->restart = ipv6cp->cfg.fsm.maxtrm;
break;
default:
fp->restart = 1;
break;
}
}
static void
ipv6cp_SendConfigReq(struct fsm *fp)
{
/* Send config REQ please */
struct physical *p = link2physical(fp->link);
struct ipv6cp *ipv6cp = fsm2ipv6cp(fp);
u_char buff[IPV6CP_IFIDLEN+2];
struct fsm_opt *o;
o = (struct fsm_opt *)buff;
if ((p && !physical_IsSync(p)) || !REJECTED(ipv6cp, TY_TOKEN)) {
memcpy(o->data, ipv6cp->my_ifid, IPV6CP_IFIDLEN);
INC_FSM_OPT(TY_TOKEN, IPV6CP_IFIDLEN + 2, o);
}
fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff,
MB_IPV6CPOUT);
}
static void
ipv6cp_SentTerminateReq(struct fsm *fp __unused)
{
/* Term REQ just sent by FSM */
}
static void
ipv6cp_SendTerminateAck(struct fsm *fp, u_char id)
{
/* Send Term ACK please */
fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_IPV6CPOUT);
}
static const char *
protoname(unsigned proto)
{
static const char *cftypes[] = { "IFACEID", "COMPPROTO" };
if (proto > 0 && proto <= sizeof cftypes / sizeof *cftypes)
return cftypes[proto - 1];
return NumStr(proto, NULL, 0);
}
static void
ipv6cp_ValidateInterfaceID(struct ipv6cp *ipv6cp, u_char *ifid,
struct fsm_decode *dec)
{
struct fsm_opt opt;
u_char zero[IPV6CP_IFIDLEN];
memset(zero, 0, IPV6CP_IFIDLEN);
if (memcmp(ifid, zero, IPV6CP_IFIDLEN) != 0
&& memcmp(ifid, ipv6cp->my_ifid, IPV6CP_IFIDLEN) != 0)
memcpy(ipv6cp->his_ifid, ifid, IPV6CP_IFIDLEN);
opt.hdr.id = TY_TOKEN;
opt.hdr.len = IPV6CP_IFIDLEN + 2;
memcpy(opt.data, &ipv6cp->his_ifid, IPV6CP_IFIDLEN);
if (memcmp(ifid, ipv6cp->his_ifid, IPV6CP_IFIDLEN) == 0)
fsm_ack(dec, &opt);
else
fsm_nak(dec, &opt);
}
static void
ipv6cp_DecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type,
struct fsm_decode *dec)
{
/* Deal with incoming PROTO_IPV6CP */
struct ipv6cp *ipv6cp = fsm2ipv6cp(fp);
int n;
char tbuff[100];
u_char ifid[IPV6CP_IFIDLEN], zero[IPV6CP_IFIDLEN];
struct fsm_opt *opt;
memset(zero, 0, IPV6CP_IFIDLEN);
while (end - cp >= (int)sizeof(opt->hdr)) {
if ((opt = fsm_readopt(&cp)) == NULL)
break;
snprintf(tbuff, sizeof tbuff, " %s[%d]", protoname(opt->hdr.id),
opt->hdr.len);
switch (opt->hdr.id) {
case TY_TOKEN:
memcpy(ifid, opt->data, IPV6CP_IFIDLEN);
log_Printf(LogIPV6CP, "%s 0x%02x%02x%02x%02x%02x%02x%02x%02x\n", tbuff,
ifid[0], ifid[1], ifid[2], ifid[3], ifid[4], ifid[5], ifid[6], ifid[7]);
switch (mode_type) {
case MODE_REQ:
ipv6cp->peer_tokenreq = 1;
ipv6cp_ValidateInterfaceID(ipv6cp, ifid, dec);
break;
case MODE_NAK:
if (memcmp(ifid, zero, IPV6CP_IFIDLEN) == 0) {
log_Printf(log_IsKept(LogIPV6CP) ? LogIPV6CP : LogPHASE,
"0x0000000000000000: Unacceptable IntefaceID!\n");
fsm_Close(&ipv6cp->fsm);
} else if (memcmp(ifid, ipv6cp->his_ifid, IPV6CP_IFIDLEN) == 0) {
log_Printf(log_IsKept(LogIPV6CP) ? LogIPV6CP : LogPHASE,
"0x%02x%02x%02x%02x%02x%02x%02x%02x: "
"Unacceptable IntefaceID!\n",
ifid[0], ifid[1], ifid[2], ifid[3],
ifid[4], ifid[5], ifid[6], ifid[7]);
} else if (memcmp(ifid, ipv6cp->my_ifid, IPV6CP_IFIDLEN) != 0) {
n = 100;
while (n && !ipcp_SetIPv6address(ipv6cp, ifid, ipv6cp->his_ifid)) {
do {
n--;
SetInterfaceID(ifid, 1);
} while (n && memcmp(ifid, ipv6cp->his_ifid, IPV6CP_IFIDLEN) == 0);
}
if (n == 0) {
log_Printf(log_IsKept(LogIPV6CP) ? LogIPV6CP : LogPHASE,
"0x0000000000000000: Unacceptable IntefaceID!\n");
fsm_Close(&ipv6cp->fsm);
} else {
log_Printf(LogIPV6CP, "%s changing IntefaceID: "
"0x%02x%02x%02x%02x%02x%02x%02x%02x "
"--> 0x%02x%02x%02x%02x%02x%02x%02x%02x\n", tbuff,
ipv6cp->my_ifid[0], ipv6cp->my_ifid[1],
ipv6cp->my_ifid[2], ipv6cp->my_ifid[3],
ipv6cp->my_ifid[4], ipv6cp->my_ifid[5],
ipv6cp->my_ifid[6], ipv6cp->my_ifid[7],
ifid[0], ifid[1], ifid[2], ifid[3],
ifid[4], ifid[5], ifid[6], ifid[7]);
memcpy(ipv6cp->my_ifid, ifid, IPV6CP_IFIDLEN);
bundle_AdjustFilters(fp->bundle, &ipv6cp->myaddr, NULL);
}
}
break;
case MODE_REJ:
ipv6cp->his_reject |= (1 << opt->hdr.id);
break;
}
break;
default:
if (mode_type != MODE_NOP) {
ipv6cp->my_reject |= (1 << opt->hdr.id);
fsm_rej(dec, opt);
}
break;
}
}
if (mode_type != MODE_NOP) {
if (mode_type == MODE_REQ && !ipv6cp->peer_tokenreq) {
if (dec->rejend == dec->rej && dec->nakend == dec->nak) {
/*
* Pretend the peer has requested a TOKEN.
* We do this to ensure that we only send one NAK if the only
* reason for the NAK is because the peer isn't sending a
* TY_TOKEN REQ. This stops us from repeatedly trying to tell
* the peer that we have to have an IP address on their end.
*/
ipv6cp->peer_tokenreq = 1;
}
memset(ifid, 0, IPV6CP_IFIDLEN);
ipv6cp_ValidateInterfaceID(ipv6cp, ifid, dec);
}
fsm_opt_normalise(dec);
}
}
#endif
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