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zebra: use a switch statement in nexthop_set_resolved()

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This makes the function much easier to read, and also faster.

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>
This commit is contained in:
Renato Westphal 2017-09-20 00:04:58 -03:00
parent cbdb74116f
commit d855d11fad
1 changed files with 23 additions and 21 deletions
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44
zebra/zebra_rib.c
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@ -325,9 +325,11 @@ static void nexthop_set_resolved(afi_t afi, struct nexthop *newhop,
resolved_hop = nexthop_new();
SET_FLAG(resolved_hop->flags, NEXTHOP_FLAG_ACTIVE);
/* If the resolving route specifies a gateway, use it */
if (newhop->type == NEXTHOP_TYPE_IPV4
|| newhop->type == NEXTHOP_TYPE_IPV4_IFINDEX) {
switch (newhop->type) {
case NEXTHOP_TYPE_IPV4:
case NEXTHOP_TYPE_IPV4_IFINDEX:
/* If the resolving route specifies a gateway, use it */
resolved_hop->type = newhop->type;
resolved_hop->gate.ipv4 = newhop->gate.ipv4;
@ -337,9 +339,9 @@ static void nexthop_set_resolved(afi_t afi, struct nexthop *newhop,
if (newhop->flags & NEXTHOP_FLAG_ONLINK)
resolved_hop->flags |= NEXTHOP_FLAG_ONLINK;
}
}
if (newhop->type == NEXTHOP_TYPE_IPV6
|| newhop->type == NEXTHOP_TYPE_IPV6_IFINDEX) {
break;
case NEXTHOP_TYPE_IPV6:
case NEXTHOP_TYPE_IPV6_IFINDEX:
resolved_hop->type = newhop->type;
resolved_hop->gate.ipv6 = newhop->gate.ipv6;
@ -347,18 +349,17 @@ static void nexthop_set_resolved(afi_t afi, struct nexthop *newhop,
resolved_hop->type = NEXTHOP_TYPE_IPV6_IFINDEX;
resolved_hop->ifindex = newhop->ifindex;
}
}
/* If the resolving route is an interface route,
* it means the gateway we are looking up is connected
* to that interface. (The actual network is _not_ onlink).
* Therefore, the resolved route should have the original
* gateway as nexthop as it is directly connected.
*
* On Linux, we have to set the onlink netlink flag because
* otherwise, the kernel won't accept the route.
*/
if (newhop->type == NEXTHOP_TYPE_IFINDEX) {
break;
case NEXTHOP_TYPE_IFINDEX:
/* If the resolving route is an interface route,
* it means the gateway we are looking up is connected
* to that interface. (The actual network is _not_ onlink).
* Therefore, the resolved route should have the original
* gateway as nexthop as it is directly connected.
*
* On Linux, we have to set the onlink netlink flag because
* otherwise, the kernel won't accept the route.
*/
resolved_hop->flags |= NEXTHOP_FLAG_ONLINK;
if (afi == AFI_IP) {
resolved_hop->type = NEXTHOP_TYPE_IPV4_IFINDEX;
@ -368,12 +369,13 @@ static void nexthop_set_resolved(afi_t afi, struct nexthop *newhop,
resolved_hop->gate.ipv6 = nexthop->gate.ipv6;
}
resolved_hop->ifindex = newhop->ifindex;
}
if (newhop->type == NEXTHOP_TYPE_BLACKHOLE) {
break;
case NEXTHOP_TYPE_BLACKHOLE:
resolved_hop->type = NEXTHOP_TYPE_BLACKHOLE;
resolved_hop->bh_type = nexthop->bh_type;
break;
}
resolved_hop->rparent = nexthop;
nexthop_add(&nexthop->resolved, resolved_hop);
}