/*
* remove a logical interface from an ifc
* always called with ifc wlock'd
*/
static char*
ipifcremlifc(Ipifc *ifc, Iplifc *lifc)
{
Iplifc **l;
Fs *f;
f = ifc->conv->p->f;
/*
* find address on this interface and remove from chain.
* for pt to pt we actually specify the remote address as the
* addresss to remove.
*/
for(l = &ifc->lifc; *l != nil && *l != lifc; l = &(*l)->next)
;
if(*l == nil)
return "address not on this interface";
*l = lifc->next;
/* disassociate any addresses */
while(lifc->link)
remselfcache(f, ifc, lifc, lifc->link->self->a);
/* remove the route for this logical interface */
if(isv4(lifc->local))
v4delroute(f, lifc->remote+IPv4off, lifc->mask+IPv4off, 1);
else {
v6delroute(f, lifc->remote, lifc->mask, 1);
if(ipcmp(lifc->local, v6loopback) == 0)
/* remove route for all node multicast */
v6delroute(f, v6allnodesN, v6allnodesNmask, 1);
else if(memcmp(lifc->local, v6linklocal, v6llpreflen) == 0)
/* remove route for all link multicast */
v6delroute(f, v6allnodesL, v6allnodesLmask, 1);
}
free(lifc);
return nil;
}
// added for new v6 mesg types
static void adddefroute6(struct Fs *f, uint8_t * gate, int force)
{
struct route *r;
r = v6lookup(f, v6Unspecified, NULL);
if (r != NULL)
if (!(force) && (strcmp(r->rt.tag, "ra") != 0)) // route entries generated
return; // by all other means take
// precedence over router annc
v6delroute(f, v6Unspecified, v6Unspecified, 1);
v6addroute(f, "ra", v6Unspecified, v6Unspecified, gate, 0);
}
/* added for new v6 mesg types */
static void
adddefroute6(Fs *f, uint8_t *gate, int force)
{
Route *r;
r = v6lookup(f, v6Unspecified, nil);
/*
* route entries generated by all other means take precedence
* over router announcements.
*/
if (r && !force && strcmp(r->tag, "ra") != 0)
return;
v6delroute(f, v6Unspecified, v6Unspecified, 1);
v6addroute(f, "ra", v6Unspecified, v6Unspecified, gate, 0);
}
/*
* Decrement reference for this address on this link.
* Unlink from selftab if this is the last ref.
* called with c->car locked
*/
static void
remselfcache(Fs *f, Ipifc *ifc, Iplifc *lifc, uint8_t *a)
{
Ipself *p, **l;
Iplink *link, **l_self, **l_lifc;
qlock(f->self);
/* find the unique selftab entry */
l = &f->self->hash[hashipa(a)];
for(p = *l; p; p = *l){
if(ipcmp(p->a, a) == 0)
break;
l = &p->next;
}
if(p == nil)
goto out;
/*
* walk down links from an ifc looking for one
* that matches the selftab entry
*/
l_lifc = &lifc->link;
for(link = *l_lifc; link; link = *l_lifc){
if(link->self == p)
break;
l_lifc = &link->lifclink;
}
if(link == nil)
goto out;
/*
* walk down the links from the selftab looking for
* the one we just found
*/
l_self = &p->link;
for(link = *l_self; link; link = *l_self){
if(link == *l_lifc)
break;
l_self = &link->selflink;
}
if(link == nil)
panic("remselfcache");
if(--(link->ref) != 0)
goto out;
if((p->type & Rmulti) && ifc->medium->remmulti != nil)
(*ifc->medium->remmulti)(ifc, a, lifc->local);
/* ref == 0, remove from both chains and free the link */
*l_lifc = link->lifclink;
*l_self = link->selflink;
iplinkfree(link);
if(p->link != nil)
goto out;
/* remove from routing table */
if(isv4(a))
v4delroute(f, a+IPv4off, IPallbits+IPv4off, 1);
else
v6delroute(f, a, IPallbits, 1);
/* no more links, remove from hash and free */
*l = p->next;
ipselffree(p);
/* if IPnoaddr, forget */
if(ipcmp(a, v4prefix) == 0 || ipcmp(a, IPnoaddr) == 0)
f->self->acceptall = 0;
out:
qunlock(f->self);
}
