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Rewrote interface type detection logic. The `unnumbered' flag is now per

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address, not per interface (hence it's ifa->flags & IA_UNNUMBERED) and
should be set reliably. IF_MULTIACCESS should be fixed now, but it isn't
wise to rely on it on interfaces configured with /30 prefix.
This commit is contained in:
Martin Mares 2000-02-29 23:19:52 +00:00
parent e69e4ed934
commit 6a636392d3
6 changed files with 79 additions and 63 deletions
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1
TODO
View file

@ -3,7 +3,6 @@ Core
- IPv6: hashing functions etc.
- krt-iface: check whether the interface alias hack works
- krt-iface and netlink: unnumberedness of tunnels
- better memory allocators
- real attribute cache

55
nest/iface.c
View file

@ -36,16 +36,25 @@ if_connected(ip_addr *a, struct iface *i) /* -1=error, 1=match, 0=no match */
if (!(i->flags & IF_UP))
return 0;
if ((i->flags & IF_UNNUMBERED) && ipa_equal(*a, i->addr->opposite))
return 1;
WALK_LIST(b, i->addrs)
if (ipa_in_net(*a, b->prefix, b->pxlen))
{
if (ipa_equal(*a, b->prefix) || /* Network address */
ipa_equal(*a, b->brd) || /* Broadcast */
ipa_equal(*a, b->ip)) /* Our own address */
return -1;
return 1;
{
if (ipa_equal(*a, b->ip))
return -1;
if (b->flags & IA_UNNUMBERED)
{
if (ipa_equal(*a, b->opposite))
return 1;
}
else
{
if (ipa_in_net(*a, b->prefix, b->pxlen))
{
if (ipa_equal(*a, b->prefix) || /* Network address */
ipa_equal(*a, b->brd)) /* Broadcast */
return -1;
return 1;
}
}
}
return 0;
}
@ -184,9 +193,10 @@ list iface_list;
void
ifa_dump(struct ifa *a)
{
debug("\t%I, net %I/%-2d bc %I -> %I%s%s\n", a->ip, a->prefix, a->pxlen, a->brd, a->opposite,
debug("\t%I, net %I/%-2d bc %I -> %I%s%s%s\n", a->ip, a->prefix, a->pxlen, a->brd, a->opposite,
(a->flags & IF_UP) ? "" : " DOWN",
(a->flags & IA_PRIMARY) ? "" : " SEC");
(a->flags & IA_PRIMARY) ? "" : " SEC",
(a->flags & IA_UNNUMBERED) ? " UNNUM" : "");
}
void
@ -205,8 +215,6 @@ if_dump(struct iface *i)
debug(" LINK-UP");
if (i->flags & IF_MULTIACCESS)
debug(" MA");
if (i->flags & IF_UNNUMBERED)
debug(" UNNUM");
if (i->flags & IF_BROADCAST)
debug(" BC");
if (i->flags & IF_MULTICAST)
@ -492,7 +500,8 @@ ifa_update(struct ifa *a)
b->pxlen == a->pxlen &&
ipa_equal(b->brd, a->brd) &&
ipa_equal(b->opposite, a->opposite) &&
b->scope == a->scope)
b->scope == a->scope &&
!((b->flags ^ a->flags) & IA_UNNUMBERED))
{
b->flags |= IF_UPDATED;
return b;
@ -500,6 +509,12 @@ ifa_update(struct ifa *a)
ifa_delete(b);
break;
}
if (!(i->flags & IF_MULTIACCESS) && a->pxlen < BITS_PER_IP_ADDRESS - 2)
log(L_WARN "Strange prefix length %d for point-to-point interface %s", a->pxlen, i->name);
if ((i->flags & IF_BROADCAST) && !ipa_nonzero(a->brd))
log(L_ERR "Missing broadcast address for interface %s", i->name);
b = mb_alloc(if_pool, sizeof(struct ifa));
memcpy(b, a, sizeof(struct ifa));
add_tail(&i->addrs, &b->n);
@ -545,8 +560,9 @@ auto_router_id(void)
j = NULL;
WALK_LIST(i, iface_list)
if ((i->flags & IF_LINK_UP) &&
!(i->flags & (IF_UNNUMBERED | IF_IGNORE | IF_ADMIN_DOWN)) &&
!(i->flags & (IF_IGNORE | IF_ADMIN_DOWN)) &&
i->addr &&
!(i->addr->flags & IA_UNNUMBERED) &&
(!j || ipa_to_u32(i->addr->ip) < ipa_to_u32(j->addr->ip)))
j = i;
if (!j)
@ -633,11 +649,12 @@ if_show_addr(struct ifa *a)
bsprintf(opp, ", opposite %I", a->opposite);
else
opp[0] = 0;
cli_msg(-1003, "\t%I/%d (%s%s%s, scope %s)",
cli_msg(-1003, "\t%I/%d (%s%s%s, scope %s%s)",
a->ip, a->pxlen,
(a->flags & IA_PRIMARY) ? "Primary" : (a->flags & IA_SECONDARY) ? "Secondary" : "???",
broad, opp,
ip_scope_text(a->scope));
ip_scope_text(a->scope),
(a->flags & IA_UNNUMBERED) ? ", unnumbered" : "");
}
void
@ -650,9 +667,7 @@ if_show(void)
WALK_LIST(i, iface_list)
{
cli_msg(-1001, "%s %s (index=%d)", i->name, (i->flags & IF_UP) ? "up" : "DOWN", i->index);
if (i->flags & IF_UNNUMBERED)
type = "UnNum-PtP";
else if (!(i->flags & IF_MULTIACCESS))
if (!(i->flags & IF_MULTIACCESS))
type = "PtP";
else
type = "MultiAccess";

14
nest/iface.h
View file

@ -40,16 +40,16 @@ struct iface {
#define IF_UP 1 /* IF_LINK_UP and IP address known */
#define IF_MULTIACCESS 2
#define IF_UNNUMBERED 4
#define IF_BROADCAST 8
#define IF_MULTICAST 0x10
#define IF_ADMIN_DOWN 0x40
#define IF_LOOPBACK 0x80
#define IF_IGNORE 0x100 /* Not to be used by routing protocols (loopbacks etc.) */
#define IF_LINK_UP 0x200
#define IF_BROADCAST 4
#define IF_MULTICAST 8
#define IF_ADMIN_DOWN 0x10
#define IF_LOOPBACK 0x20
#define IF_IGNORE 0x40 /* Not to be used by routing protocols (loopbacks etc.) */
#define IF_LINK_UP 0x80
#define IA_PRIMARY 0x10000 /* This address is primary */
#define IA_SECONDARY 0x20000 /* This address has been reported as secondary by the kernel */
#define IA_UNNUMBERED 0x40000 /* This address belongs to an unnumbered device */
#define IA_FLAGS 0xff0000
#define IF_JUST_CREATED 0x10000000 /* Send creation event as soon as possible */

5
nest/rt-dev.c
View file

@ -56,10 +56,7 @@ dev_ifa_notify(struct proto *p, unsigned c, struct ifa *ad)
A.iface = ad->iface;
A.eattrs = NULL;
a = rta_lookup(&A);
if (ad->flags & IF_UNNUMBERED)
n = net_get(p->table, ad->opposite, ad->pxlen);
else
n = net_get(p->table, ad->prefix, ad->pxlen);
n = net_get(p->table, ad->prefix, ad->pxlen);
e = rte_get_temp(a);
e->net = n;
e->pflags = 0;

57
sysdep/linux/netlink/netlink.c
View file

@ -301,13 +301,14 @@ nl_parse_link(struct nlmsghdr *h, int scan)
fl = i->ifi_flags;
if (fl & IFF_UP)
f.flags |= IF_LINK_UP;
/* FIXME: Unnumberedness of tunnels */
if (fl & IFF_POINTOPOINT)
f.flags |= IF_UNNUMBERED | IF_MULTICAST;
if (fl & IFF_LOOPBACK)
f.flags |= IF_LOOPBACK | IF_IGNORE;
if (fl & IFF_BROADCAST)
f.flags |= IF_BROADCAST | IF_MULTICAST;
if (fl & IFF_LOOPBACK) /* Loopback */
f.flags |= IF_MULTIACCESS | IF_LOOPBACK | IF_IGNORE;
else if (fl & IFF_POINTOPOINT) /* PtP */
f.flags |= IF_MULTICAST;
else if (fl & IFF_BROADCAST) /* Broadcast */
f.flags |= IF_MULTIACCESS | IF_BROADCAST | IF_MULTICAST;
else
f.flags |= IF_MULTIACCESS; /* NBMA */
if_update(&f);
}
}
@ -350,15 +351,6 @@ nl_parse_addr(struct nlmsghdr *h)
return;
}
#ifndef IPV6
if (i->ifa_prefixlen > 32 || i->ifa_prefixlen == 31 ||
(ifi->flags & IF_UNNUMBERED) && i->ifa_prefixlen != 32)
{
log(L_ERR "KIF: Invalid prefix length for interface %s: %d", ifi->name, i->ifa_prefixlen);
new = 0;
}
#endif
bzero(&ifa, sizeof(ifa));
ifa.iface = ifi;
if (i->ifa_flags & IFA_F_SECONDARY)
@ -367,26 +359,37 @@ nl_parse_addr(struct nlmsghdr *h)
memcpy(&ifa.ip, RTA_DATA(a[IFA_LOCAL] ? : a[IFA_ADDRESS]), sizeof(ifa.ip));
ipa_ntoh(ifa.ip);
ifa.pxlen = i->ifa_prefixlen;
if (ifi->flags & IF_UNNUMBERED)
if (i->ifa_prefixlen > BITS_PER_IP_ADDRESS ||
i->ifa_prefixlen == BITS_PER_IP_ADDRESS - 1)
{
log(L_ERR "KIF: Invalid prefix length for interface %s: %d", ifi->name, i->ifa_prefixlen);
new = 0;
}
if (i->ifa_prefixlen == BITS_PER_IP_ADDRESS)
{
ifa.flags |= IA_UNNUMBERED;
memcpy(&ifa.opposite, RTA_DATA(a[IFA_ADDRESS]), sizeof(ifa.opposite));
ipa_ntoh(ifa.opposite);
ifa.brd = ifa.opposite;
ifa.prefix = ifa.brd = ifa.opposite;
}
#ifndef IPV6
else if ((ifi->flags & IF_BROADCAST) && a[IFA_BROADCAST])
else
{
memcpy(&ifa.brd, RTA_DATA(a[IFA_BROADCAST]), sizeof(ifa.brd));
ipa_ntoh(ifa.brd);
}
if (i->ifa_prefixlen == BITS_PER_IP_ADDRESS - 2)
ifa.opposite = ipa_opposite(ifa.ip);
#ifndef IPV6
if ((ifi->flags & IF_BROADCAST) && a[IFA_BROADCAST])
{
memcpy(&ifa.brd, RTA_DATA(a[IFA_BROADCAST]), sizeof(ifa.brd));
ipa_ntoh(ifa.brd);
}
#endif
/* else a NBMA link */
ifa.prefix = ipa_and(ifa.ip, ipa_mkmask(ifa.pxlen));
ifa.prefix = ipa_and(ifa.ip, ipa_mkmask(ifa.pxlen));
}
DBG("KIF: IF%d(%s): %s IPA %I, net %I/%d, brd %I, opp %I\n",
DBG("KIF: IF%d(%s): %s IPA %I, flg %x, net %I/%d, brd %I, opp %I\n",
ifi->index, ifi->name,
new ? "added" : "removed",
ifa.ip, ifa.prefix, ifa.pxlen, ifa.brd, ifa.opposite);
ifa.ip, ifa.flags, ifa.prefix, ifa.pxlen, ifa.brd, ifa.opposite);
if (new)
ifa_update(&ifa);
else

10
sysdep/unix/krt-iface.c
View file

@ -94,12 +94,15 @@ scan_ifs(struct ifreq *r, int cnt)
if (fl & IFF_POINTOPOINT)
{
i.flags |= IF_UNNUMBERED;
a.pxlen = BITS_PER_IP_ADDRESS;
a.flags |= IA_UNNUMBERED;
if (ioctl(if_scan_sock, SIOCGIFDSTADDR, r) < 0)
{ err = "SIOCGIFDSTADDR"; goto faulty; }
get_sockaddr((struct sockaddr_in *) &r->ifr_addr, &a.opposite, NULL);
a.prefix = a.opposite;
a.pxlen = BITS_PER_IP_ADDRESS;
}
else
a.prefix = ipa_and(a.ip, ipa_mkmask(a.pxlen));
if (fl & IFF_LOOPBACK)
i.flags |= IF_LOOPBACK | IF_IGNORE;
if (1
@ -107,12 +110,11 @@ scan_ifs(struct ifreq *r, int cnt)
&& (fl & IFF_MULTICAST)
#endif
#ifndef CONFIG_UNNUM_MULTICAST
&& !(i.flags & IF_UNNUMBERED)
&& !(a.flags & IA_UNNUMBERED)
#endif
)
i.flags |= IF_MULTICAST;
a.prefix = ipa_and(a.ip, ipa_mkmask(a.pxlen));
if (a.pxlen < 32)
{
a.brd = ipa_or(a.prefix, ipa_not(ipa_mkmask(a.pxlen)));