lib, zebra: Add SR-TE policy infrastructure to zebra

For the sake of Segment Routing (SR) and Traffic Engineering (TE)
Policies there's a need for additional infrastructure within zebra.
The infrastructure in this PR is supposed to manage such policies
in terms of installing binding SIDs and LSPs. Also it is capable of
managing MPLS labels using the label manager, keeping track of
nexthops (for resolving labels) and notifying interested parties about
changes of a policy/LSP state. Further it enables a route map mechanism
for BGP and SR-TE colors such that learned BGP routes can be mapped
onto SR-TE Policies.

This PR does not introduce any usable features by now, it is just
infrastructure for other upcoming PRs which will introduce 'pathd',
a new SR-TE daemon.

Co-authored-by: Renato Westphal <renato@opensourcerouting.org>
Co-authored-by: GalaxyGorilla <sascha@netdef.org>
Signed-off-by: Sebastien Merle <sebastien@netdef.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/zebra/zebra_mpls.h b/zebra/zebra_mpls.h
index 07a8efeb8b..c0e58c44e3 100644
--- a/zebra/zebra_mpls.h
+++ b/zebra/zebra_mpls.h
@@ -33,6 +33,7 @@
 #include "mpls.h"
 #include "zebra/zserv.h"
 #include "zebra/zebra_vrf.h"
+#include "hook.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -326,6 +327,11 @@ int mpls_lsp_install(struct zebra_vrf *zvrf, enum lsp_types_t type,
 		     const union g_addr *gate, ifindex_t ifindex);
 
 /*
+ * Lookup LSP by its input label.
+ */
+zebra_lsp_t *mpls_lsp_find(struct zebra_vrf *zvrf, mpls_label_t in_label);
+
+/*
  * Uninstall a particular NHLFE in the forwarding table. If this is
  * the only NHLFE, the entire LSP forwarding entry has to be deleted.
  */
@@ -461,6 +467,7 @@ static inline uint8_t lsp_distance(enum lsp_types_t type)
 	case ZEBRA_LSP_SHARP:
 	case ZEBRA_LSP_OSPF_SR:
 	case ZEBRA_LSP_ISIS_SR:
+	case ZEBRA_LSP_SRTE:
 		return 150;
 	}
 
@@ -492,6 +499,8 @@ static inline enum lsp_types_t lsp_type_from_re_type(int re_type)
 		return ZEBRA_LSP_ISIS_SR;
 	case ZEBRA_ROUTE_SHARP:
 		return ZEBRA_LSP_SHARP;
+	case ZEBRA_ROUTE_SRTE:
+		return ZEBRA_LSP_SRTE;
 	default:
 		return ZEBRA_LSP_NONE;
 	}
@@ -517,6 +526,8 @@ static inline int re_type_from_lsp_type(enum lsp_types_t lsp_type)
 		return ZEBRA_ROUTE_KERNEL;
 	case ZEBRA_LSP_SHARP:
 		return ZEBRA_ROUTE_SHARP;
+	case ZEBRA_LSP_SRTE:
+		return ZEBRA_ROUTE_SRTE;
 	}
 
 	/*
@@ -544,6 +555,8 @@ static inline const char *nhlfe_type2str(enum lsp_types_t lsp_type)
 		return "SR (IS-IS)";
 	case ZEBRA_LSP_SHARP:
 		return "SHARP";
+	case ZEBRA_LSP_SRTE:
+		return "SR-TE";
 	case ZEBRA_LSP_NONE:
 		return "Unknown";
 	}