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| author | Russ White <russ@riw.us> | 2020-04-21 09:08:06 -0400 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-04-21 09:08:06 -0400 |
| commit | e805a969acaa3dad61e205b49a21cdff32646034 (patch) | |
| tree | 7b1bd4d0bc63fe5eb477b9caac3a111fb6557c28 | |
| parent | 70395c6fd5d02ddf860c0d8079b4f7dd3615128b (diff) | |
| parent | 8963e0c82b02a0afe8d319844e42e21dd57d6747 (diff) | |
Merge pull request #6147 from opensourcerouting/ldpd-broken-lsps
ldpd: don't drop packets coming through a broken LSP
| -rw-r--r-- | ldpd/ldp_zebra.c | 42 |
1 files changed, 26 insertions, 16 deletions
diff --git a/ldpd/ldp_zebra.c b/ldpd/ldp_zebra.c index b3ccb77602..28e56ecd64 100644 --- a/ldpd/ldp_zebra.c +++ b/ldpd/ldp_zebra.c @@ -108,8 +108,7 @@ ldp_zebra_send_mpls_labels(int cmd, struct kroute *kr) struct zapi_labels zl = {}; struct zapi_nexthop *znh; - if (kr->local_label < MPLS_LABEL_RESERVED_MAX || - kr->remote_label == NO_LABEL) + if (kr->local_label < MPLS_LABEL_RESERVED_MAX) return (0); debug_zebra_out("prefix %s/%u nexthop %s ifindex %u labels %s/%s (%s)", @@ -122,21 +121,32 @@ ldp_zebra_send_mpls_labels(int cmd, struct kroute *kr) zl.local_label = kr->local_label; /* Set prefix. */ - SET_FLAG(zl.message, ZAPI_LABELS_FTN); - zl.route.prefix.family = kr->af; - switch (kr->af) { - case AF_INET: - zl.route.prefix.u.prefix4 = kr->prefix.v4; - break; - case AF_INET6: - zl.route.prefix.u.prefix6 = kr->prefix.v6; - break; - default: - fatalx("ldp_zebra_send_mpls_labels: unknown af"); + if (kr->remote_label != NO_LABEL) { + SET_FLAG(zl.message, ZAPI_LABELS_FTN); + zl.route.prefix.family = kr->af; + switch (kr->af) { + case AF_INET: + zl.route.prefix.u.prefix4 = kr->prefix.v4; + break; + case AF_INET6: + zl.route.prefix.u.prefix6 = kr->prefix.v6; + break; + default: + fatalx("ldp_zebra_send_mpls_labels: unknown af"); + } + zl.route.prefix.prefixlen = kr->prefixlen; + zl.route.type = kr->route_type; + zl.route.instance = kr->route_instance; } - zl.route.prefix.prefixlen = kr->prefixlen; - zl.route.type = kr->route_type; - zl.route.instance = kr->route_instance; + + /* + * For broken LSPs, instruct the forwarding plane to pop the top-level + * label and forward packets normally. This is a best-effort attempt + * to deliver labeled IP packets to their final destination (instead of + * dropping them). + */ + if (kr->remote_label == NO_LABEL) + kr->remote_label = MPLS_LABEL_IMPLICIT_NULL; /* Set nexthop. */ zl.nexthop_num = 1; |