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o The if_change_too_big_p change was too high-spirited. Fixed.

Browse source 
o  Introduced if_find_by_index()
o  Recognizing two types of interface updates: full update (starting with
   if_start_update(), ending with if_end_update(), guaranteed to see
   all existing interfaces) and a partial update (only if_update(),
   usually due to asynchronous interface notifications).
This commit is contained in:
Martin Mares 1999-03-02 18:36:09 +00:00
parent bcbd8cc3be
commit e35ef181a4
3 changed files with 31 additions and 9 deletions
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37
nest/iface.c
View file

@ -231,8 +231,6 @@ if_dump_all(void)
static inline int
if_change_too_big_p(struct iface *i, struct iface *j)
{
if ((i->flags ^ j->flags) & IF_UP) /* Going up/down is always OK */
return 0;
if (!ipa_equal(i->ip, j->ip) || /* Address change isn't */
!ipa_equal(i->prefix, j->prefix) ||
i->pxlen != j->pxlen ||
@ -310,16 +308,19 @@ if_update(struct iface *new)
if (if_change_too_big_p(i, new)) /* Changed a lot, convert it to down/up */
{
DBG("Interface %s changed too much -- forcing down/up transition\n", i->name);
i->flags &= ~IF_UP;
if_notify_change(IF_CHANGE_DOWN | IF_CHANGE_FLAGS, i, NULL);
if (i->flags & IF_UP)
{
i->flags &= ~IF_UP;
if_notify_change(IF_CHANGE_DOWN | IF_CHANGE_FLAGS, i, NULL);
}
rem_node(&i->n);
goto newif;
}
c = if_changed(i, new);
if_copy(i, new); /* Even if c==0 as we might need to update i->index et al. */
i->flags |= IF_UPDATED;
if (c)
if_notify_change(c, i, new);
if_copy(i, new); /* Even if c==0 as we might need to update i->index et al. */
i->flags |= IF_UPDATED;
return;
}
@ -332,6 +333,15 @@ newif:
| IF_CHANGE_FLAGS | IF_CHANGE_MTU, NULL, i);
}
void
if_start_update(void)
{
struct iface *i;
WALK_LIST(i, iface_list)
i->flags &= ~IF_UPDATED;
}
void
if_end_update(void)
{
@ -341,9 +351,7 @@ if_end_update(void)
auto_router_id();
WALK_LIST(i, iface_list)
if (i->flags & IF_UPDATED)
i->flags &= ~IF_UPDATED;
else
if (!(i->flags & IF_UPDATED))
{
memcpy(&j, i, sizeof(struct iface));
i->flags = (i->flags & ~(IF_LINK_UP | IF_UP)) | IF_ADMIN_DOWN;
@ -364,6 +372,17 @@ if_feed_baby(struct proto *p)
p->if_notify(p, IF_CHANGE_CREATE | ((i->flags & IF_UP) ? IF_CHANGE_UP : 0), i, NULL);
}
struct iface *
if_find_by_index(unsigned idx)
{
struct iface *i;
WALK_LIST(i, iface_list)
if (i->index == idx)
return i;
return NULL;
}
static void
auto_router_id(void) /* FIXME: What if we run IPv6??? */
{

2
nest/iface.h
View file

@ -53,8 +53,10 @@ void if_init(void);
void if_dump(struct iface *);
void if_dump_all(void);
void if_update(struct iface *);
void if_start_update(void);
void if_end_update(void);
void if_feed_baby(struct proto *);
struct iface *if_find_by_index(unsigned);
/*
* Neighbor Cache. We hold (direct neighbor, protocol) pairs we've seen

1
sysdep/unix/sync-if.c
View file

@ -37,6 +37,7 @@ scan_ifs(struct ifreq *r, int cnt)
ip_addr netmask;
int l;
if_start_update();
for (cnt /= sizeof(struct ifreq); cnt; cnt--, r++)
{
bzero(&i, sizeof(i));