bgpd: Add RFC9234 implementation

RFC9234 is a way to establish correct connection roles (Customer/
Provider, Peer or with RS) between bgp speakers. This patch:
- Add a new configuration/terminal option to set the appropriate local
role;
- Add a mechanism for checking used roles, implemented by exchanging
the corresponding capabilities in OPEN messages;
- Add strict mode to force other party to use this feature;
- Add basic support for a new transitive optional bgp attribute - OTC
(Only to Customer);
- Add logic for default setting OTC attribute and filtering routes with
this attribute by the edge speakers, if the appropriate conditions are
met;
- Add two test stands to check role negotiation and route filtering
during role usage.

Signed-off-by: Eugene Bogomazov <eb@qrator.net>

1 files changed, 29 insertions, 0 deletions

diff --git a/tests/bgpd/test_capability.c b/tests/bgpd/test_capability.c
index 44d15d601..51792825d 100644
--- a/tests/bgpd/test_capability.c
+++ b/tests/bgpd/test_capability.c
@@ -649,6 +649,35 @@ static struct test_segment misc_segments[] =
 			2,
 			SHOULD_PARSE,
 		},
+		{
+			"Role",
+			"Role capability",
+			{
+				/* hdr */ 0x9, 0x1,
+				0x1,
+			},
+			3,
+			SHOULD_PARSE,
+		},
+		{
+			"Role-long",
+			"Role capability, but too long",
+			{
+				/* hdr */ 0x9, 0x4,
+				0x0, 0x0, 0x0, 0x1,
+			},
+			6,
+			SHOULD_ERR,
+		},
+		{
+			"Role-empty",
+			"Role capability, but empty.",
+			{
+				/* hdr */ 0x9, 0x0,
+			},
+			2,
+			SHOULD_ERR,
+		},
 		{NULL, NULL, {0}, 0, 0}};
 
 /* DYNAMIC message */