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zebra: implement NEXTHOP_FLAG_ONLINK

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On Linux, the kernel will only allow for a route to be installed when
its gateway is directly attached according the kernel fib.

There are cases when this restriction by the kernel is too strong, in
those cases, we deploy the RTNH_F_ONLINK netlink flag.

Signed-off-by: Christian Franke <chris@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
This commit is contained in:
Christian Franke 2013-07-05 15:35:39 +00:00 committed by David Lamparter
parent 48a53dc71c
commit e8d3d2991f
3 changed files with 18 additions and 1 deletions
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1
zebra/rib.h
View File

@ -253,6 +253,7 @@ struct nexthop
#define NEXTHOP_FLAG_ACTIVE (1 << 0) /* This nexthop is alive. */
#define NEXTHOP_FLAG_FIB (1 << 1) /* FIB nexthop. */
#define NEXTHOP_FLAG_RECURSIVE (1 << 2) /* Recursive nexthop. */
#define NEXTHOP_FLAG_ONLINK (1 << 3) /* Nexthop should be installed onlink. */
/* Nexthop address */
union g_addr gate;

9
zebra/rt_netlink.c
View File

@ -1443,8 +1443,11 @@ _netlink_route_build_singlepath(
int bytelen,
struct nexthop *nexthop,
struct nlmsghdr *nlmsg,
struct rtmsg *rtmsg,
size_t req_size)
{
if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ONLINK))
rtmsg->rtm_flags |= RTNH_F_ONLINK;
if (nexthop->type == NEXTHOP_TYPE_IPV4
|| nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX)
{
@ -1534,6 +1537,9 @@ _netlink_route_build_multipath(
rtnh->rtnh_hops = 0;
rta->rta_len += rtnh->rtnh_len;
if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ONLINK))
rtnh->rtnh_flags |= RTNH_F_ONLINK;
if (nexthop->type == NEXTHOP_TYPE_IPV4
|| nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX)
{
@ -1733,7 +1739,8 @@ netlink_route_multipath (int cmd, struct prefix *p, struct rib *rib,
_netlink_route_debug(cmd, p, nexthop, routedesc, family);
_netlink_route_build_singlepath(routedesc, bytelen,
nexthop, &req.n, sizeof req);
nexthop, &req.n, &req.r,
sizeof req);
if (cmd == RTM_NEWROUTE)
SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);

9
zebra/zebra_vty.c
View File

@ -615,6 +615,9 @@ vty_show_ip_route_detail (struct vty *vty, struct route_node *rn)
if (! CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE))
vty_out (vty, " inactive");
if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ONLINK))
vty_out (vty, " onlink");
if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
vty_out (vty, " (recursive)");
@ -710,6 +713,9 @@ vty_show_ip_route (struct vty *vty, struct route_node *rn, struct rib *rib)
if (! CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE))
vty_out (vty, " inactive");
if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ONLINK))
vty_out (vty, " onlink");
if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
vty_out (vty, " (recursive)");
@ -1600,6 +1606,9 @@ vty_show_ipv6_route_detail (struct vty *vty, struct route_node *rn)
if (! CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE))
vty_out (vty, " inactive");
if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ONLINK))
vty_out (vty, " onlink");
if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
vty_out (vty, " (recursive)");