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Merge pull request #4955 from sworleys/GW-IFINDEX-Verify-Resolve

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zebra: Don't resolve to diff interface if given
This commit is contained in:
Russ White 2019-09-10 11:06:34 -04:00 committed by GitHub
commit 853ba636ff
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 29 additions and 4 deletions
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33
zebra/zebra_nhg.c
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@ -122,6 +122,33 @@ static void nexthop_set_resolved(afi_t afi, const struct nexthop *newhop,
_nexthop_add(&nexthop->resolved, resolved_hop);
}
/* Checks if nexthop we are trying to resolve to is valid */
static bool nexthop_valid_resolve(const struct nexthop *nexthop,
const struct nexthop *resolved)
{
/* Can't resolve to a recursive nexthop */
if (CHECK_FLAG(resolved->flags, NEXTHOP_FLAG_RECURSIVE))
return false;
switch (nexthop->type) {
case NEXTHOP_TYPE_IPV4_IFINDEX:
case NEXTHOP_TYPE_IPV6_IFINDEX:
/* If the nexthop we are resolving to does not match the
* ifindex for the nexthop the route wanted, its not valid.
*/
if (nexthop->ifindex != resolved->ifindex)
return false;
break;
case NEXTHOP_TYPE_IPV4:
case NEXTHOP_TYPE_IPV6:
case NEXTHOP_TYPE_IFINDEX:
case NEXTHOP_TYPE_BLACKHOLE:
break;
}
return true;
}
/*
* Given a nexthop we need to properly recursively resolve
* the route. As such, do a table lookup to find and match
@ -287,8 +314,7 @@ static int nexthop_active(afi_t afi, struct route_entry *re,
if (!CHECK_FLAG(match->status,
ROUTE_ENTRY_INSTALLED))
continue;
if (CHECK_FLAG(newhop->flags,
NEXTHOP_FLAG_RECURSIVE))
if (!nexthop_valid_resolve(nexthop, newhop))
continue;
SET_FLAG(nexthop->flags,
@ -308,8 +334,7 @@ static int nexthop_active(afi_t afi, struct route_entry *re,
if (!CHECK_FLAG(match->status,
ROUTE_ENTRY_INSTALLED))
continue;
if (CHECK_FLAG(newhop->flags,
NEXTHOP_FLAG_RECURSIVE))
if (!nexthop_valid_resolve(nexthop, newhop))
continue;
SET_FLAG(nexthop->flags,