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Interface logic changes:

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o  Introduced IF_LINK_UP flag corresponding to real link state.
o  Allowed addressless interfaces.
o  IF_UP is now automatically calculated and set iff the interface
   is administratively up, has link up and has an IP address assigned.
   It may be IF_IGNORED, though (as in case of the loopback).
o  Any changes which include up/down transition are considered small
   enough to not provoke artificial upping and downing of the interface.
o  When an interface disappears (i.e., it wasn't seen in the last scan),
   we announce this change only once.
o  IF_LOOPBACK implies IF_IGNORE.
This commit is contained in:
Martin Mares 1999-03-02 17:28:06 +00:00
parent 25287d6f7e
commit bcbd8cc3be
3 changed files with 36 additions and 21 deletions
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28
nest/iface.c
View file

@ -31,7 +31,7 @@ static list neigh_list;
static int
if_connected(ip_addr *a, struct iface *i) /* -1=error, 1=match, 0=no match */
{
if (i->flags & (IF_ADMIN_DOWN | IF_IGNORE))
if (!(i->flags & IF_UP))
return 0;
if ((i->flags & IF_UNNUMBERED) && ipa_equal(*a, i->opposite))
return 1;
@ -41,8 +41,6 @@ if_connected(ip_addr *a, struct iface *i) /* -1=error, 1=match, 0=no match */
ipa_equal(*a, i->brd) || /* Broadcast */
ipa_equal(*a, i->ip)) /* Our own address */
return -1;
if (!(i->flags & IF_UP))
return 0;
return 1;
}
@ -197,6 +195,10 @@ if_dump(struct iface *i)
debug(" ADMIN-DOWN");
if (i->flags & IF_UP)
debug(" UP");
else
debug(" DOWN");
if (i->flags & IF_LINK_UP)
debug(" LINK-UP");
if (i->flags & IF_MULTIACCESS)
debug(" MA");
if (i->flags & IF_UNNUMBERED)
@ -229,14 +231,16 @@ if_dump_all(void)
static inline int
if_change_too_big_p(struct iface *i, struct iface *j)
{
if (!ipa_equal(i->ip, j->ip) ||
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 ||
!ipa_equal(i->brd, j->brd) ||
!ipa_equal(i->opposite, j->opposite))
return 1; /* Changed addresses */
if ((i->flags ^ j->flags) & ~(IF_UP | IF_ADMIN_DOWN | IF_UPDATED))
return 1;
if ((i->flags ^ j->flags) & ~(IF_UP | IF_ADMIN_DOWN | IF_UPDATED | IF_LINK_UP))
return 1; /* Interface type change isn't as well */
return 0;
}
@ -295,6 +299,11 @@ if_update(struct iface *new)
struct iface *i;
unsigned c;
if ((new->flags & IF_LINK_UP) && !(new->flags & IF_ADMIN_DOWN) && ipa_nonzero(new->ip))
new->flags |= IF_UP;
else
new->flags &= ~IF_UP;
WALK_LIST(i, iface_list)
if (!strcmp(new->name, i->name))
{
@ -337,8 +346,9 @@ if_end_update(void)
else
{
memcpy(&j, i, sizeof(struct iface));
i->flags = (i->flags & ~IF_UP) | IF_ADMIN_DOWN;
if_notify_change(IF_CHANGE_DOWN | IF_CHANGE_FLAGS, &j, i);
i->flags = (i->flags & ~(IF_LINK_UP | IF_UP)) | IF_ADMIN_DOWN;
if (i->flags != j.flags)
if_notify_change(IF_CHANGE_DOWN | IF_CHANGE_FLAGS, &j, i);
}
}
@ -362,7 +372,7 @@ auto_router_id(void) /* FIXME: What if we run IPv6??? */
j = NULL;
WALK_LIST(i, iface_list)
if ((i->flags & IF_UP) &&
!(i->flags & (IF_UNNUMBERED | IF_LOOPBACK | IF_IGNORE)) &&
!(i->flags & (IF_UNNUMBERED | IF_IGNORE)) &&
(!j || ipa_to_u32(i->ip) < ipa_to_u32(j->ip)))
j = i;
if (!j)

7
nest/iface.h
View file

@ -21,7 +21,7 @@ struct iface {
unsigned flags;
unsigned mtu;
unsigned index; /* OS-dependent interface index */
ip_addr ip; /* IP address of this host */
ip_addr ip; /* IP address of this host (0=unset) */
ip_addr prefix; /* Network prefix */
unsigned pxlen; /* Prefix length */
ip_addr brd; /* Broadcast address */
@ -29,7 +29,7 @@ struct iface {
struct neighbor *neigh; /* List of neighbors on this interface */
};
#define IF_UP 1
#define IF_UP 1 /* IF_LINK_UP, not IF_IGNORE and IP address known */
#define IF_MULTIACCESS 2
#define IF_UNNUMBERED 4
#define IF_BROADCAST 8
@ -38,7 +38,8 @@ struct iface {
#define IF_ADMIN_DOWN 64
#define IF_LOOPBACK 128
#define IF_IGNORE 256
#define IF_UPDATED 0x1000 /* Touched in last scan */
#define IF_LINK_UP 512
#define IF_UPDATED 0x40000000 /* Touched in last scan */
/* Interface change events */

22
sysdep/unix/sync-if.c
View file

@ -42,16 +42,18 @@ scan_ifs(struct ifreq *r, int cnt)
bzero(&i, sizeof(i));
DBG("%s\n", r->ifr_ifrn.ifrn_name);
strncpy(i.name, r->ifr_ifrn.ifrn_name, sizeof(i.name) - 1);
i.name[sizeof(i.name) - 1] = 0;
get_sockaddr((struct sockaddr_in *) &r->ifr_addr, &i.ip, NULL);
l = ipa_classify(i.ip);
if (l < 0 || !(l & IADDR_HOST))
if (ipa_nonzero(i.ip))
{
log(L_ERR "%s: Invalid interface address", i.name);
goto bad;
l = ipa_classify(i.ip);
if (l < 0 || !(l & IADDR_HOST))
{
log(L_ERR "%s: Invalid interface address", i.name);
i.ip = IPA_NONE;
}
else if ((l & IADDR_SCOPE_MASK) == SCOPE_HOST)
i.flags |= IF_LOOPBACK | IF_IGNORE;
}
if ((l & IADDR_SCOPE_MASK) == SCOPE_HOST)
i.flags |= IF_LOOPBACK | IF_IGNORE;
if (ioctl(if_scan_sock, SIOCGIFFLAGS, r) < 0)
{
@ -59,12 +61,12 @@ scan_ifs(struct ifreq *r, int cnt)
faulty:
log(L_ERR "%s(%s): %m", err, i.name);
bad:
i.flags = (i.flags & ~IF_UP) | IF_ADMIN_DOWN;
i.flags = (i.flags & ~IF_LINK_UP) | IF_ADMIN_DOWN;
continue;
}
fl = r->ifr_flags;
if (fl & IFF_UP)
i.flags |= IF_UP;
i.flags |= IF_LINK_UP;
if (ioctl(if_scan_sock, SIOCGIFNETMASK, r) < 0)
{ err = "SIOCGIFNETMASK"; goto faulty; }
@ -120,6 +122,8 @@ scan_ifs(struct ifreq *r, int cnt)
DBG("SIOCGIFINDEX failed: %m\n");
else
i.index = r->ifr_ifindex;
#else
/* FIXME: What else? Guess ifindex (we need it at least for OSPF on unnumbered links)? */
#endif
if_update(&i);