/*
* attach a device (or pkt driver) to the interface.
* called with c locked
*/
static char*
ipifcbind(Conv *c, char **argv, int argc)
{
Ipifc *ifc;
Medium *m;
if(argc < 2)
return Ebadarg;
ifc = (Ipifc*)c->ptcl;
/* bind the device to the interface */
m = ipfindmedium(argv[1]);
if(m == nil)
return "unknown interface type";
wlock(ifc);
if(ifc->m != nil) {
wunlock(ifc);
return "interface already bound";
}
if(waserror()) {
wunlock(ifc);
nexterror();
}
/* do medium specific binding */
(*m->bind)(ifc, argc, argv);
/* set the bound device name */
if(argc > 2)
strncpy(ifc->dev, argv[2], sizeof(ifc->dev));
else
snprint(ifc->dev, sizeof ifc->dev, "%s%d", m->name, c->x);
ifc->dev[sizeof(ifc->dev)-1] = 0;
/* set up parameters */
ifc->m = m;
ifc->mintu = ifc->m->mintu;
ifc->maxtu = ifc->m->maxtu;
if(ifc->m->unbindonclose == 0)
ifc->conv->inuse++;
ifc->rp.mflag = 0; /* default not managed */
ifc->rp.oflag = 0;
ifc->rp.maxraint = 600000; /* millisecs */
ifc->rp.minraint = 200000;
ifc->rp.linkmtu = 0; /* no mtu sent */
ifc->rp.reachtime = 0;
ifc->rp.rxmitra = 0;
ifc->rp.ttl = MAXTTL;
ifc->rp.routerlt = 3 * ifc->rp.maxraint;
/* any ancillary structures (like routes) no longer pertain */
ifc->ifcid++;
/* reopen all the queues closed by a previous unbind */
qreopen(c->rq);
qreopen(c->eq);
qreopen(c->sq);
wunlock(ifc);
poperror();
return nil;
}
/*
* called with protocol locked
*/
Conv*
Fsprotoclone(Proto *p, char *user)
{
Conv *c, **pp, **ep;
retry:
c = nil;
ep = &p->conv[p->nc];
for(pp = p->conv; pp < ep; pp++) {
c = *pp;
if(c == nil){
c = malloc(sizeof(Conv));
if(c == nil)
error(Enomem);
qlock(c);
c->p = p;
c->x = pp - p->conv;
if(p->ptclsize != 0){
c->ptcl = malloc(p->ptclsize);
if(c->ptcl == nil) {
free(c);
error(Enomem);
}
}
*pp = c;
p->ac++;
c->eq = qopen(1024, Qmsg, 0, 0);
(*p->create)(c);
break;
}
if(canqlock(c)){
/*
* make sure both processes and protocol
* are done with this Conv
*/
if(c->inuse == 0 && (p->inuse == nil || (*p->inuse)(c) == 0))
break;
qunlock(c);
}
}
if(pp >= ep) {
if(p->gc)
print("Fsprotoclone: garbage collecting Convs\n");
if(p->gc != nil && (*p->gc)(p))
goto retry;
/* debugging: do we ever get here? */
if (cpuserver)
panic("Fsprotoclone: all conversations in use");
return nil;
}
c->inuse = 1;
kstrdup(&c->owner, user);
c->perm = 0660;
c->state = Idle;
ipmove(c->laddr, IPnoaddr);
ipmove(c->raddr, IPnoaddr);
c->r = nil;
c->rgen = 0;
c->lport = 0;
c->rport = 0;
c->restricted = 0;
c->maxfragsize = 0;
c->ttl = MAXTTL;
qreopen(c->rq);
qreopen(c->wq);
qreopen(c->eq);
qunlock(c);
return c;
}
