pimd: add support for MSDP authentication

Implement MSDP MD5 authentication connection support.

Implementation details:
- Move the MSDP socket creation code to a generic function so it can be
  parametrized to be used with/without authentication.
- The MSDP peer connection will not change when the configuration is
  set, instead it will only be applied next connection or when
  `clear ip msdp peer A.B.C.D` is called.

Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/pimd/pim_msdp.h b/pimd/pim_msdp.h
index a45726cb85..f77b0e1a3a 100644
--- a/pimd/pim_msdp.h
+++ b/pimd/pim_msdp.h
@@ -89,6 +89,11 @@ enum pim_msdp_peer_flags {
 	PIM_MSDP_PEERF_IN_GROUP = (1 << 2),
 };
 
+enum msdp_auth_type {
+	MSDP_AUTH_NONE = 0,
+	MSDP_AUTH_MD5 = 1,
+};
+
 struct pim_msdp_peer {
 	struct pim_instance *pim;
 
@@ -98,6 +103,13 @@ struct pim_msdp_peer {
 	char *mesh_group_name;
 	char key_str[INET_ADDRSTRLEN];
 
+	/* Authentication data. */
+	enum msdp_auth_type auth_type;
+	char *auth_key;
+
+	int auth_listen_sock;
+	struct event *auth_listen_ev;
+
 	/* state */
 	enum pim_msdp_peer_state state;
 	enum pim_msdp_peer_flags flags;
@@ -309,6 +321,15 @@ void pim_msdp_peer_del(struct pim_msdp_peer **mp);
 void pim_msdp_peer_change_source(struct pim_msdp_peer *mp,
 				 const struct in_addr *addr);
 
+/**
+ * Restart peer's connection.
+ *
+ * This is used internally in MSDP and should be used by northbound
+ * when wanting to immediately apply connections settings such as
+ * authentication.
+ */
+void pim_msdp_peer_restart(struct pim_msdp_peer *mp);
+
 #else /* PIM_IPV == 6 */
 static inline void pim_msdp_init(struct pim_instance *pim,
 				 struct event_loop *master)