ref: 24420ab9eb9124dd2ac032beacd84e4a2f6ddf56
dir: /sys/src/cmd/ip/ipconfig/ipv6.c/
/*
* ipconfig for IPv6
* RS means Router Solicitation
* RA means Router Advertisement
*/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <ip.h>
#include "ipconfig.h"
#include "../icmp.h"
#pragma varargck argpos ralog 1
#define RALOG "v6routeradv"
#define NetS(x) (((uchar*)x)[0]<< 8 | ((uchar*)x)[1])
#define NetL(x) (((uchar*)x)[0]<<24 | ((uchar*)x)[1]<<16 | \
((uchar*)x)[2]<< 8 | ((uchar*)x)[3])
enum {
ICMP6LEN= 4,
};
typedef struct Hdr Hdr;
struct Hdr /* ICMP v4 & v6 header */
{
uchar type;
uchar code;
uchar cksum[2]; /* Checksum */
uchar data[];
};
char *icmpmsg6[Maxtype6+1] =
{
[EchoReply] "EchoReply",
[UnreachableV6] "UnreachableV6",
[PacketTooBigV6] "PacketTooBigV6",
[TimeExceedV6] "TimeExceedV6",
[Redirect] "Redirect",
[EchoRequest] "EchoRequest",
[TimeExceed] "TimeExceed",
[InParmProblem] "InParmProblem",
[Timestamp] "Timestamp",
[TimestampReply] "TimestampReply",
[InfoRequest] "InfoRequest",
[InfoReply] "InfoReply",
[AddrMaskRequest] "AddrMaskRequest",
[AddrMaskReply] "AddrMaskReply",
[EchoRequestV6] "EchoRequestV6",
[EchoReplyV6] "EchoReplyV6",
[RouterSolicit] "RouterSolicit",
[RouterAdvert] "RouterAdvert",
[NbrSolicit] "NbrSolicit",
[NbrAdvert] "NbrAdvert",
[RedirectV6] "RedirectV6",
};
static char *icmp6opts[] =
{
[0] "unknown option",
[V6nd_srclladdr] "srcll_addr",
[V6nd_targlladdr] "targll_addr",
[V6nd_pfxinfo] "prefix",
[V6nd_redirhdr] "redirect",
[V6nd_mtu] "mtu",
[V6nd_home] "home",
[V6nd_srcaddrs] "src_addrs",
[V6nd_ip] "ip",
[V6nd_rdns] "rdns",
[V6nd_9fs] "9fs",
[V6nd_9auth] "9auth",
};
uchar v6allroutersL[IPaddrlen] = {
0xff, 0x02, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0x02
};
uchar v6allnodesL[IPaddrlen] = {
0xff, 0x02, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0x01
};
uchar v6Unspecified[IPaddrlen] = {
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0
};
uchar v6loopback[IPaddrlen] = {
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 1
};
uchar v6glunicast[IPaddrlen] = {
0x08, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0
};
uchar v6linklocal[IPaddrlen] = {
0xfe, 0x80, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0
};
uchar v6solpfx[IPaddrlen] = {
0xff, 0x02, 0, 0,
0, 0, 0, 0,
0, 0, 0, 1,
/* last 3 bytes filled with low-order bytes of addr being solicited */
0xff, 0, 0, 0,
};
uchar v6defmask[IPaddrlen] = {
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0, 0, 0, 0,
0, 0, 0, 0
};
enum
{
Vadd,
Vremove,
Vunbind,
Vaddpref6,
Vra6,
};
static void
ralog(char *fmt, ...)
{
char msg[512];
va_list arg;
va_start(arg, fmt);
vseprint(msg, msg+sizeof msg, fmt, arg);
va_end(arg);
syslog(debug, RALOG, msg);
}
extern void
ea2lla(uchar *lla, uchar *ea)
{
assert(IPaddrlen == 16);
memset(lla, 0, IPaddrlen);
lla[0] = 0xFE;
lla[1] = 0x80;
lla[8] = ea[0] | 0x2;
lla[9] = ea[1];
lla[10] = ea[2];
lla[11] = 0xFF;
lla[12] = 0xFE;
lla[13] = ea[3];
lla[14] = ea[4];
lla[15] = ea[5];
}
extern void
ipv62smcast(uchar *smcast, uchar *a)
{
assert(IPaddrlen == 16);
memset(smcast, 0, IPaddrlen);
smcast[0] = 0xFF;
smcast[1] = 0x02;
smcast[11] = 0x1;
smcast[12] = 0xFF;
smcast[13] = a[13];
smcast[14] = a[14];
smcast[15] = a[15];
}
void
v6paraminit(Conf *cf)
{
cf->sendra = cf->recvra = 0;
cf->mflag = 0;
cf->oflag = 0;
cf->maxraint = Maxv6initraintvl;
cf->minraint = Maxv6initraintvl / 4;
cf->linkmtu = 1500;
cf->reachtime = V6reachabletime;
cf->rxmitra = V6retranstimer;
cf->ttl = MAXTTL;
cf->routerlt = 0;
cf->prefixlen = 64;
cf->onlink = 0;
cf->autoflag = 0;
cf->validlt = cf->preflt = ~0L;
}
static char *
optname(unsigned opt)
{
static char buf[32];
if (opt >= nelem(icmp6opts) || icmp6opts[opt] == nil) {
snprint(buf, sizeof buf, "unknown option %d", opt);
return buf;
} else
return icmp6opts[opt];
}
static char*
opt_seprint(uchar *ps, uchar *pe, char *sps, char *spe)
{
int otype, osz, pktsz;
uchar *a;
char *p = sps, *e = spe;
a = ps;
for (pktsz = pe - ps; pktsz > 0; pktsz -= osz) {
otype = a[0];
osz = a[1] * 8;
switch (otype) {
default:
return seprint(p, e, " option=%s ", optname(otype));
case V6nd_srclladdr:
case V6nd_targlladdr:
if (pktsz < osz || osz != 8)
return seprint(p, e, " option=%s bad size=%d",
optname(otype), osz);
p = seprint(p, e, " option=%s maddr=%E", optname(otype),
a+2);
break;
case V6nd_pfxinfo:
if (pktsz < osz || osz != 32)
return seprint(p, e, " option=%s: bad size=%d",
optname(otype), osz);
p = seprint(p, e, " option=%s pref=%I preflen=%3.3d"
" lflag=%1.1d aflag=%1.1d unused1=%1.1d"
" validlt=%ud preflt=%ud unused2=%1.1d",
optname(otype), a+16, (int)(*(a+2)),
(*(a+3) & (1 << 7)) != 0,
(*(a+3) & (1 << 6)) != 0,
(*(a+3) & 63) != 0,
NetL(a+4), NetL(a+8), NetL(a+12)!=0);
break;
}
a += osz;
}
return p;
}
static void
pkt2str(uchar *ps, uchar *pe, char *sps, char *spe)
{
int pktlen;
char *tn, *p, *e;
uchar *a;
Hdr *h;
h = (Hdr*)ps;
a = ps + 4;
p = sps;
e = spe;
pktlen = pe - ps;
if(pktlen < ICMP6LEN) {
seprint(sps, spe, "short pkt");
return;
}
tn = icmpmsg6[h->type];
if(tn == nil)
p = seprint(p, e, "t=%ud c=%d ck=%4.4ux", h->type,
h->code, (ushort)NetS(h->cksum));
else
p = seprint(p, e, "t=%s c=%d ck=%4.4ux", tn,
h->code, (ushort)NetS(h->cksum));
switch(h->type){
case RouterSolicit:
ps += 8;
p = seprint(p, e, " unused=%1.1d ", NetL(a)!=0);
opt_seprint(ps, pe, p, e);
break;
case RouterAdvert:
ps += 16;
p = seprint(p, e, " hoplim=%3.3d mflag=%1.1d oflag=%1.1d"
" unused=%1.1d routerlt=%d reachtime=%d rxmtimer=%d",
a[0],
(*(a+1) & (1 << 7)) != 0,
(*(a+1) & (1 << 6)) != 0,
(*(a+1) & 63) != 0,
NetS(a+2), NetL(a+4), NetL(a+8));
opt_seprint(ps, pe, p, e);
break;
default:
seprint(p, e, " unexpected icmp6 pkt type");
break;
}
}
static void
catch(void *a, char *msg)
{
USED(a);
if(strstr(msg, "alarm"))
noted(NCONT);
else
noted(NDFLT);
}
/*
* based on libthread's threadsetname, but drags in less library code.
* actually just sets the arguments displayed.
*/
void
procsetname(char *fmt, ...)
{
int fd;
char *cmdname;
char buf[128];
va_list arg;
va_start(arg, fmt);
cmdname = vsmprint(fmt, arg);
va_end(arg);
if (cmdname == nil)
return;
snprint(buf, sizeof buf, "#p/%d/args", getpid());
if((fd = open(buf, OWRITE)) >= 0){
write(fd, cmdname, strlen(cmdname)+1);
close(fd);
}
free(cmdname);
}
int
dialicmp(uchar *dst, int dport, int *ctlfd)
{
int fd, cfd, n, m;
char cmsg[100], name[128], connind[40];
char hdrs[] = "headers";
snprint(name, sizeof name, "%s/icmpv6/clone", conf.mpoint);
cfd = open(name, ORDWR);
if(cfd < 0)
sysfatal("dialicmp: can't open %s: %r", name);
n = snprint(cmsg, sizeof cmsg, "connect %I!%d!r %d", dst, dport, dport);
m = write(cfd, cmsg, n);
if (m < n)
sysfatal("dialicmp: can't write %s to %s: %r", cmsg, name);
seek(cfd, 0, 0);
n = read(cfd, connind, sizeof connind);
if (n < 0)
connind[0] = 0;
else if (n < sizeof connind)
connind[n] = 0;
else
connind[sizeof connind - 1] = 0;
snprint(name, sizeof name, "%s/icmpv6/%s/data", conf.mpoint, connind);
fd = open(name, ORDWR);
if(fd < 0)
sysfatal("dialicmp: can't open %s: %r", name);
n = sizeof hdrs - 1;
if(write(cfd, hdrs, n) < n)
sysfatal("dialicmp: can't write `%s' to %s: %r", hdrs, name);
*ctlfd = cfd;
return fd;
}
/* add ipv6 addr to an interface */
int
ip6cfg(int autoconf)
{
int tentative, dupfound = 0, n;
char *p, buf[256];
uchar ethaddr[6];
Biobuf *bp;
if (autoconf) { /* create link-local addr */
if (myetheraddr(ethaddr, conf.dev) < 0)
sysfatal("myetheraddr w/ %s failed: %r", conf.dev);
ea2lla(conf.laddr, ethaddr);
}
tentative = dupl_disc;
Again:
if (tentative)
n = sprint(buf, "try");
else
n = sprint(buf, "add");
n += snprint(buf+n, sizeof buf-n, " %I", conf.laddr);
if(!validip(conf.mask))
ipmove(conf.mask, v6defmask);
n += snprint(buf+n, sizeof buf-n, " %M", conf.mask);
if(validip(conf.raddr)){
n += snprint(buf+n, sizeof buf-n, " %I", conf.raddr);
if(conf.mtu != 0)
n += snprint(buf+n, sizeof buf-n, " %d", conf.mtu);
}
if(write(conf.cfd, buf, n) < 0){
warning("write(%s): %r", buf);
return -1;
}
if (!tentative)
return 0;
sleep(3000);
/* read arp table, look for addr duplication */
snprint(buf, sizeof buf, "%s/arp", conf.mpoint);
bp = Bopen(buf, OREAD);
if (bp == 0) {
warning("couldn't open %s: %r", buf);
return -1;
}
snprint(buf, sizeof buf, "%I", conf.laddr);
while(p = Brdline(bp, '\n')){
p[Blinelen(bp)-1] = 0;
if(cistrstr(p, buf) != 0) {
dupfound = 1;
break;
}
}
Bterm(bp);
if (!dupfound) {
tentative = 0;
goto Again;
}
warning("found dup entry in arp cache");
doremove();
return 0;
}
static int
recvra6on(Ipifc *ifc)
{
if (ifc == nil)
return 0;
else if (ifc->sendra6 > 0)
return IsRouter;
else if (ifc->recvra6 > 0)
return IsHostRecv;
else
return IsHostNoRecv;
}
/* send icmpv6 router solicitation to multicast address for all routers */
static void
sendrs(int fd)
{
Routersol *rs;
uchar buff[sizeof *rs];
memset(buff, 0, sizeof buff);
rs = (Routersol *)buff;
memmove(rs->dst, v6allroutersL, IPaddrlen);
memmove(rs->src, v6Unspecified, IPaddrlen);
rs->type = ICMP6_RS;
if(write(fd, rs, sizeof buff) < sizeof buff)
ralog("sendrs: write failed, pkt size %d", sizeof buff);
else
ralog("sendrs: sent solicitation to %I from %I on %s",
rs->dst, rs->src, conf.dev);
}
/*
* a router receiving a router adv from another
* router calls this; it is basically supposed to
* log the information in the ra and raise a flag
* if any parameter value is different from its configured values.
*
* doing nothing for now since I don't know where to log this yet.
*/
static void
recvrarouter(uchar buf[], int pktlen)
{
USED(buf, pktlen);
ralog("i am a router and got a router advert");
}
/* host receiving a router advertisement calls this */
static void
ewrite(int fd, char *str)
{
int n;
n = strlen(str);
if (write(fd, str, n) != n)
ralog("write(%s) failed: %r", str);
}
static void
issuebasera6(Conf *cf)
{
char *cfg;
cfg = smprint("ra6 mflag %d oflag %d reachtime %d rxmitra %d "
"ttl %d routerlt %d",
cf->mflag, cf->oflag, cf->reachtime, cf->rxmitra,
cf->ttl, cf->routerlt);
ewrite(cf->cfd, cfg);
free(cfg);
}
static void
issuerara6(Conf *cf)
{
char *cfg;
cfg = smprint("ra6 sendra %d recvra %d maxraint %d minraint %d "
"linkmtu %d",
cf->sendra, cf->recvra, cf->maxraint, cf->minraint,
cf->linkmtu);
ewrite(cf->cfd, cfg);
free(cfg);
}
static void
issueadd6(Conf *cf)
{
char *cfg;
cfg = smprint("add6 %I %d %d %d %lud %lud", cf->v6pref, cf->prefixlen,
cf->onlink, cf->autoflag, cf->validlt, cf->preflt);
ewrite(cf->cfd, cfg);
free(cfg);
}
static void
recvrahost(uchar buf[], int pktlen)
{
int arpfd, m, n;
char abuf[100];
uchar optype;
Lladdropt *llao;
Mtuopt *mtuo;
Prefixopt *prfo;
Routeradv *ra;
static int first = 1;
ra = (Routeradv*)buf;
// memmove(conf.v6gaddr, ra->src, IPaddrlen);
conf.ttl = ra->cttl;
conf.mflag = (MFMASK & ra->mor);
conf.oflag = (OCMASK & ra->mor);
conf.routerlt = nhgets(ra->routerlt);
conf.reachtime = nhgetl(ra->rchbltime);
conf.rxmitra = nhgetl(ra->rxmtimer);
// issueadd6(&conf); /* for conf.v6gaddr? */
if (fprint(conf.cfd, "ra6 recvra 1") < 0)
ralog("write(ra6 recvra 1) failed: %r");
issuebasera6(&conf);
m = sizeof *ra;
while (pktlen - m > 0) {
optype = buf[m];
switch (optype) {
case V6nd_srclladdr:
llao = (Lladdropt *)&buf[m];
m += 8 * buf[m+1];
if (llao->len != 1) {
ralog("recvrahost: illegal len (%d) for source "
"link layer address option", llao->len);
return;
}
if (!ISIPV6LINKLOCAL(ra->src)) {
ralog("recvrahost: non-link-local src addr for "
"router adv %I", ra->src);
return;
}
snprint(abuf, sizeof abuf, "%s/arp", conf.mpoint);
arpfd = open(abuf, OWRITE);
if (arpfd < 0) {
ralog("recvrahost: couldn't open %s to write: %r",
abuf);
return;
}
n = snprint(abuf, sizeof abuf, "add ether %I %E",
ra->src, llao->lladdr);
if (write(arpfd, abuf, n) < n)
ralog("recvrahost: couldn't write to %s/arp",
conf.mpoint);
close(arpfd);
break;
case V6nd_targlladdr:
case V6nd_redirhdr:
m += 8 * buf[m+1];
ralog("ignoring unexpected option type `%s' in Routeradv",
optname(optype));
break;
case V6nd_mtu:
mtuo = (Mtuopt*)&buf[m];
m += 8 * mtuo->len;
conf.linkmtu = nhgetl(mtuo->mtu);
break;
case V6nd_pfxinfo:
prfo = (Prefixopt*)&buf[m];
m += 8 * prfo->len;
if (prfo->len != 4) {
ralog("illegal len (%d) for prefix option",
prfo->len);
return;
}
memmove(conf.v6pref, prfo->pref, IPaddrlen);
conf.prefixlen = prfo->plen;
conf.onlink = ((prfo->lar & OLMASK) != 0);
conf.autoflag = ((prfo->lar & AFMASK) != 0);
conf.validlt = nhgetl(prfo->validlt);
conf.preflt = nhgetl(prfo->preflt);
issueadd6(&conf);
if (first) {
first = 0;
ralog("got initial RA from %I on %s; pfx %I",
ra->src, conf.dev, prfo->pref);
}
break;
case V6nd_srcaddrs:
/* netsbd sends this, so quietly ignore it for now */
m += 8 * buf[m+1];
break;
default:
m += 8 * buf[m+1];
ralog("ignoring optype %d in Routeradv", optype);
break;
}
}
}
/*
* daemon to receive router advertisements from routers
*/
void
recvra6(void)
{
int fd, cfd, n, sendrscnt, sleepfor;
uchar buf[4096];
Ipifc *ifc = nil;
/* TODO: why not v6allroutersL? */
fd = dialicmp(v6allnodesL, ICMP6_RA, &cfd);
if (fd < 0)
sysfatal("can't open icmp_ra connection: %r");
notify(catch);
sendrscnt = Maxv6rss;
switch(rfork(RFPROC|RFMEM|RFFDG|RFNOWAIT|RFNOTEG)){
case -1:
sysfatal("can't fork: %r");
default:
return;
case 0:
break;
}
procsetname("recvra6 on %s", conf.dev);
ralog("recvra6 on %s", conf.dev);
sleepfor = jitter();
for (;;) {
/*
* We only get 3 (Maxv6rss) tries, so make sure we
* wait long enough to be certain that at least one RA
* will be transmitted.
*/
if (sleepfor < 7000)
sleepfor = 7000;
alarm(sleepfor);
n = read(fd, buf, sizeof buf);
alarm(0);
ifc = readipifc(conf.mpoint, ifc, myifc);
if (ifc == nil) {
ralog("recvra6: can't read router params on %s",
conf.mpoint);
continue;
}
if (n <= 0) {
if (sendrscnt > 0) {
sendrscnt--;
if (recvra6on(ifc) == IsHostRecv)
sendrs(fd);
sleepfor = V6rsintvl + nrand(100);
}
if (sendrscnt == 0) {
sendrscnt--;
sleepfor = 0;
ralog("recvra6: no router advs after %d sols on %s",
Maxv6rss, conf.dev);
}
continue;
}
sleepfor = 0;
sendrscnt = -1; /* got at least initial ra; no whining */
switch (recvra6on(ifc)) {
case IsRouter:
recvrarouter(buf, n);
break;
case IsHostRecv:
recvrahost(buf, n);
break;
case IsHostNoRecv:
ralog("recvra6: recvra off, quitting on %s", conf.dev);
close(fd);
exits(0);
}
}
}
/*
* return -1 -- error, reading/writing some file,
* 0 -- no arp table updates
* 1 -- successful arp table update
*/
int
recvrs(uchar *buf, int pktlen, uchar *sol)
{
int n, optsz, arpfd;
char abuf[256];
Routersol *rs;
Lladdropt *llao;
rs = (Routersol *)buf;
n = sizeof *rs;
optsz = pktlen - n;
pkt2str(buf, buf+pktlen, abuf, abuf+nelem(abuf));
if (optsz != sizeof *llao)
return 0;
if (buf[n] != V6nd_srclladdr || 8*buf[n+1] != sizeof *llao) {
ralog("rs opt err %s", abuf);
return -1;
}
ralog("rs recv %s", abuf);
if (memcmp(rs->src, v6Unspecified, IPaddrlen) == 0)
return 0;
snprint(abuf, sizeof abuf, "%s/arp", conf.mpoint);
arpfd = open(abuf, OWRITE);
if (arpfd < 0) {
ralog("recvrs: can't open %s/arp to write: %r", conf.mpoint);
return -1;
}
llao = (Lladdropt *)buf[n];
n = snprint(abuf, sizeof abuf, "add ether %I %E", rs->src, llao->lladdr);
if (write(arpfd, abuf, n) < n) {
ralog("recvrs: can't write to %s/arp: %r", conf.mpoint);
close(arpfd);
return -1;
}
memmove(sol, rs->src, IPaddrlen);
close(arpfd);
return 1;
}
void
sendra(int fd, uchar *dst, int rlt, Ipifc *ifc)
{
int pktsz, preflen;
char abuf[1024], tmp[40];
uchar buf[1024], macaddr[6], src[IPaddrlen];
Iplifc *lifc, *nlifc;
Lladdropt *llao;
Prefixopt *prfo;
Routeradv *ra;
memset(buf, 0, sizeof buf);
ra = (Routeradv *)buf;
myetheraddr(macaddr, conf.dev);
ea2lla(src, macaddr);
memmove(ra->src, src, IPaddrlen);
memmove(ra->dst, dst, IPaddrlen);
ra->type = ICMP6_RA;
ra->cttl = conf.ttl;
if (conf.mflag > 0)
ra->mor |= MFMASK;
if (conf.oflag > 0)
ra->mor |= OCMASK;
if (rlt > 0)
hnputs(ra->routerlt, conf.routerlt);
else
hnputs(ra->routerlt, 0);
hnputl(ra->rchbltime, conf.reachtime);
hnputl(ra->rxmtimer, conf.rxmitra);
pktsz = sizeof *ra;
/* include all global unicast prefixes on interface in prefix options */
for (lifc = (ifc? ifc->lifc: nil); lifc; lifc = nlifc) {
nlifc = lifc->next;
prfo = (Prefixopt *)(buf + pktsz);
/* global unicast address? */
if (!ISIPV6LINKLOCAL(lifc->ip) && !ISIPV6MCAST(lifc->ip) &&
memcmp(lifc->ip, IPnoaddr, IPaddrlen) != 0 &&
memcmp(lifc->ip, v6loopback, IPaddrlen) != 0 &&
!isv4(lifc->ip)) {
memmove(prfo->pref, lifc->net, IPaddrlen);
/* hack to find prefix length */
snprint(tmp, sizeof tmp, "%M", lifc->mask);
preflen = atoi(&tmp[1]);
prfo->plen = preflen & 0xff;
if (prfo->plen == 0)
continue;
prfo->type = V6nd_pfxinfo;
prfo->len = 4;
prfo->lar = AFMASK;
hnputl(prfo->validlt, lifc->validlt);
hnputl(prfo->preflt, lifc->preflt);
pktsz += sizeof *prfo;
}
}
/*
* include link layer address (mac address for now) in
* link layer address option
*/
llao = (Lladdropt *)(buf + pktsz);
llao->type = V6nd_srclladdr;
llao->len = 1;
memmove(llao->lladdr, macaddr, sizeof macaddr);
pktsz += sizeof *llao;
pkt2str(buf+40, buf+pktsz, abuf, abuf+1024);
if(write(fd, buf, pktsz) < pktsz)
ralog("sendra fail %s: %r", abuf);
else if (debug)
ralog("sendra succ %s", abuf);
}
/*
* daemon to send router advertisements to hosts
*/
void
sendra6(void)
{
int fd, cfd, n, dstknown = 0, sendracnt, sleepfor, nquitmsgs;
long lastra, now;
uchar buf[4096], dst[IPaddrlen];
Ipifc *ifc = nil;
fd = dialicmp(v6allnodesL, ICMP6_RS, &cfd);
if (fd < 0)
sysfatal("can't open icmp_rs connection: %r");
notify(catch);
sendracnt = Maxv6initras;
nquitmsgs = Maxv6finalras;
switch(rfork(RFPROC|RFMEM|RFFDG|RFNOWAIT|RFNOTEG)){
case -1:
sysfatal("can't fork: %r");
default:
return;
case 0:
break;
}
procsetname("sendra6 on %s", conf.dev);
ralog("sendra6 on %s", conf.dev);
sleepfor = jitter();
for (;;) {
lastra = time(0);
if (sleepfor < 0)
sleepfor = 0;
alarm(sleepfor);
n = read(fd, buf, sizeof buf);
alarm(0);
ifc = readipifc(conf.mpoint, ifc, myifc);
if (ifc == nil) {
ralog("sendra6: can't read router params on %s",
conf.mpoint);
continue;
}
if (ifc->sendra6 <= 0)
if (nquitmsgs > 0) {
sendra(fd, v6allnodesL, 0, ifc);
nquitmsgs--;
sleepfor = Minv6interradelay + jitter();
continue;
} else {
ralog("sendra6: sendra off, quitting on %s",
conf.dev);
exits(0);
}
nquitmsgs = Maxv6finalras;
if (n <= 0) { /* no RS */
if (sendracnt > 0)
sendracnt--;
} else { /* respond to RS */
dstknown = recvrs(buf, n, dst);
now = time(0);
if (now - lastra < Minv6interradelay) {
/* too close, skip */
sleepfor = lastra + Minv6interradelay +
jitter() - now;
continue;
}
sleep(jitter());
}
sleepfor = randint(ifc->rp.minraint, ifc->rp.maxraint);
if (dstknown > 0)
sendra(fd, dst, 1, ifc);
else
sendra(fd, v6allnodesL, 1, ifc);
}
}
void
startra6(void)
{
static char routeon[] = "iprouting 1";
if (conf.recvra > 0)
recvra6();
if (conf.sendra > 0) {
if (write(conf.cfd, routeon, sizeof routeon - 1) < 0) {
warning("write (iprouting 1) failed: %r");
return;
}
sendra6();
if (conf.recvra <= 0)
recvra6();
}
}
void
doipv6(int what)
{
nip = nipifcs(conf.mpoint);
if(!noconfig){
lookforip(conf.mpoint);
controldevice();
binddevice();
}
switch (what) {
default:
sysfatal("unknown IPv6 verb");
case Vaddpref6:
issueadd6(&conf);
break;
case Vra6:
issuebasera6(&conf);
issuerara6(&conf);
dolog = 1;
startra6();
break;
}
}