bfdd: add bfdname in bfd_key

sbfd will use bfdname for key hash, We introduced a bfd-name for every sbfd session, normal BFD sessions can leave it as NULL.
A unique bfd-name can be used to identify a sbfd session quickly. This is quite useful in our Srv6 deployment for path protection case.
For example, if use the sbfd session to protect the SRv6 path A-B-D, we would assign the name 'path-a-b-d' or 'a-b-d' to the session.

Signed-off-by: wumu.zsl <wumu.zsl@alibaba-inc.com>

bfdd/bfd.c

@@ -222,10 +222,11 @@ void bfd_profile_remove(struct bfd_session *bs)
 	bfd_session_apply(bs);
 }
 
-void gen_bfd_key(struct bfd_key *key, struct sockaddr_any *peer,
-		 struct sockaddr_any *local, bool mhop, const char *ifname,
-		 const char *vrfname)
+void gen_bfd_key(struct bfd_key *key, struct sockaddr_any *peer, struct sockaddr_any *local,
+		 bool mhop, const char *ifname, const char *vrfname, const char *bfdname)
 {
+	struct vrf *vrf = NULL;
+
 	memset(key, 0, sizeof(*key));
 
 	switch (peer->sa_sin.sin_family) {
@@ -248,19 +249,29 @@ void gen_bfd_key(struct bfd_key *key, struct sockaddr_any *peer,
 	key->mhop = mhop;
 	if (ifname && ifname[0])
 		strlcpy(key->ifname, ifname, sizeof(key->ifname));
-	if (vrfname && vrfname[0])
+	if (vrfname && vrfname[0] && strcmp(vrfname, VRF_DEFAULT_NAME) != 0) {
+		vrf = vrf_lookup_by_name(vrfname);
+		if (vrf) {
+			strlcpy(key->vrfname, vrf->name, sizeof(key->vrfname));
+		} else {
 			strlcpy(key->vrfname, vrfname, sizeof(key->vrfname));
-	else
+		}
+	} else {
 		strlcpy(key->vrfname, VRF_DEFAULT_NAME, sizeof(key->vrfname));
 	}
 
+	if (bfdname && bfdname[0]) {
+		strlcpy(key->bfdname, bfdname, sizeof(key->bfdname));
+	}
+}
+
 struct bfd_session *bs_peer_find(struct bfd_peer_cfg *bpc)
 {
 	struct bfd_key key;
 
 	/* Otherwise fallback to peer/local hash lookup. */
-	gen_bfd_key(&key, &bpc->bpc_peer, &bpc->bpc_local, bpc->bpc_mhop,
-		    bpc->bpc_localif, bpc->bpc_vrfname);
+	gen_bfd_key(&key, &bpc->bpc_peer, &bpc->bpc_local, bpc->bpc_mhop, bpc->bpc_localif,
+		    bpc->bpc_vrfname, bpc->bfd_name);
 
 	return bfd_key_lookup(key);
 }
@@ -599,7 +610,7 @@ struct bfd_session *ptm_bfd_sess_find(struct bfd_pkt *cp,
 	vrf = vrf_lookup_by_id(vrfid);
 
 	gen_bfd_key(&key, peer, local, is_mhop, ifp ? ifp->name : NULL,
-		    vrf ? vrf->name : VRF_DEFAULT_NAME);
+		    vrf ? vrf->name : VRF_DEFAULT_NAME, NULL);
 
 	/* XXX maybe remoteDiscr should be checked for remoteHeard cases. */
 	return bfd_key_lookup(key);
@@ -1713,6 +1724,7 @@ void bfd_shutdown(void)
 struct bfd_session_iterator {
 	int bsi_stop;
 	bool bsi_mhop;
+	uint32_t bsi_bfdmode;
 	const struct bfd_session *bsi_bs;
 };
 
@@ -1724,7 +1736,7 @@ static int _bfd_session_next(struct hash_bucket *hb, void *arg)
 	/* Previous entry signaled stop. */
 	if (bsi->bsi_stop == 1) {
 		/* Match the single/multi hop sessions. */
-		if (bs->key.mhop != bsi->bsi_mhop)
+		if ((bs->key.mhop != bsi->bsi_mhop) || (bs->bfd_mode != bsi->bsi_bfdmode))
 			return HASHWALK_CONTINUE;
 
 		bsi->bsi_bs = bs;
@@ -1736,7 +1748,8 @@ static int _bfd_session_next(struct hash_bucket *hb, void *arg)
 		bsi->bsi_stop = 1;
 		/* Set entry to NULL to signal end of list. */
 		bsi->bsi_bs = NULL;
-	} else if (bsi->bsi_bs == NULL && bsi->bsi_mhop == bs->key.mhop) {
+	} else if (bsi->bsi_bs == NULL && bsi->bsi_mhop == bs->key.mhop &&
+		   bsi->bsi_bfdmode == bs->bfd_mode) {
 		/* We want the first list item. */
 		bsi->bsi_stop = 1;
 		bsi->bsi_bs = hb->data;
@@ -1751,14 +1764,15 @@ static int _bfd_session_next(struct hash_bucket *hb, void *arg)
  *
  * `bs` might point to NULL to get the first item of the data structure.
  */
-const struct bfd_session *bfd_session_next(const struct bfd_session *bs,
-					   bool mhop)
+const struct bfd_session *bfd_session_next(const struct bfd_session *bs, bool mhop,
+					   uint32_t bfd_mode)
 {
 	struct bfd_session_iterator bsi;
 
 	bsi.bsi_stop = 0;
 	bsi.bsi_bs = bs;
 	bsi.bsi_mhop = mhop;
+	bsi.bsi_bfdmode = bfd_mode;
 	hash_walk(bfd_key_hash, _bfd_session_next, &bsi);
 	if (bsi.bsi_stop == 0)
 		return NULL;

bfdd/bfd.h

@@ -19,6 +19,7 @@
 #include "lib/qobj.h"
 #include "lib/queue.h"
 #include "lib/vrf.h"
+#include "lib/bfd.h"
 
 #ifdef BFD_DEBUG
 #define BFDD_JSON_CONV_OPTIONS (JSON_C_TO_STRING_PRETTY)
@@ -86,6 +87,10 @@ struct bfd_peer_cfg {
 
 	bool bpc_has_profile;
 	char bpc_profile[64];
+
+	vrf_id_t vrf_id;
+	char bfd_name[BFD_NAME_SIZE + 1];
+	uint8_t bfd_name_len;
 };
 
 /* bfd Authentication Type. */
@@ -260,6 +265,7 @@ struct bfd_key {
 	struct in6_addr local;
 	char ifname[IFNAMSIZ];
 	char vrfname[VRF_NAMSIZ];
+	char bfdname[BFD_NAME_SIZE + 1];
 } __attribute__((packed));
 
 struct bfd_session_stats {
@@ -381,6 +387,9 @@ struct bfd_session {
 	uint8_t rtt_valid;	    /* number of valid samples */
 	uint8_t rtt_index;	    /* last index added */
 	uint64_t rtt[BFD_RTT_SAMPLE]; /* RRT in usec for echo to be looped */
+	char bfd_name[BFD_NAME_SIZE + 1];
+
+	uint32_t bfd_mode;
 };
 
 struct bfd_diag_str_list {
@@ -604,14 +613,13 @@ void bs_observer_del(struct bfd_session_observer *bso);
 
 void bs_to_bpc(struct bfd_session *bs, struct bfd_peer_cfg *bpc);
 
-void gen_bfd_key(struct bfd_key *key, struct sockaddr_any *peer,
-		 struct sockaddr_any *local, bool mhop, const char *ifname,
-		 const char *vrfname);
+void gen_bfd_key(struct bfd_key *key, struct sockaddr_any *peer, struct sockaddr_any *local,
+		 bool mhop, const char *ifname, const char *vrfname, const char *bfdname);
 struct bfd_session *bfd_session_new(void);
 struct bfd_session *bs_registrate(struct bfd_session *bs);
 void bfd_session_free(struct bfd_session *bs);
-const struct bfd_session *bfd_session_next(const struct bfd_session *bs,
-					   bool mhop);
+const struct bfd_session *bfd_session_next(const struct bfd_session *bs, bool mhop,
+					   uint32_t bfd_mode);
 void bfd_sessions_remove_manual(void);
 void bfd_profiles_remove(void);
 void bfd_rtt_init(struct bfd_session *bfd);

bfdd/bfdd_nb_config.c

@@ -13,14 +13,50 @@
 
 #include "bfd.h"
 #include "bfdd_nb.h"
+#include <ifaddrs.h>
 
 /*
  * Helpers.
  */
+static void get_ip_by_interface(const char *ifname, const char *vrfname, int family, char *ifip)
+{
+	char intfip[INET6_ADDRSTRLEN];
+	const struct interface *interface;
+	const struct connected *connected;
+	struct vrf *vrf;
+
+	vrf = vrf_lookup_by_name(vrfname ? vrfname : VRF_DEFAULT_NAME);
+	if (!vrf)
+		return;
+
+	interface = if_lookup_by_name_vrf(ifname, vrf);
+	if (interface == NULL)
+		return;
+
+	frr_each (if_connected_const, interface->connected, connected) {
+		if (!connected->address)
+			continue;
+
+		if (family != connected->address->family)
+			continue;
+
+		if (family == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&connected->address->u.prefix6))
+			continue;
+
+		inet_ntop(family,
+			  family == AF_INET ? (void *)(&connected->address->u.prefix4)
+					    : (void *)(&connected->address->u.prefix6),
+			  intfip, INET6_ADDRSTRLEN);
+		strlcpy(ifip, intfip, INET6_ADDRSTRLEN - 1);
+		break;
+	}
+}
+
 static void bfd_session_get_key(bool mhop, const struct lyd_node *dnode,
 				struct bfd_key *bk)
 {
 	const char *ifname = NULL, *vrfname = NULL;
+	char ifip[INET6_ADDRSTRLEN] = { 0 };
 	struct sockaddr_any psa, lsa;
 
 	/* Required destination parameter. */
@@ -37,10 +73,16 @@ static void bfd_session_get_key(bool mhop, const struct lyd_node *dnode,
 		ifname = yang_dnode_get_string(dnode, "interface");
 		if (strcmp(ifname, "*") == 0)
 			ifname = NULL;
+
+		if (ifname != NULL && !yang_dnode_exists(dnode, "source-addr") &&
+		    psa.sa_sin.sin_family != 0) {
+			get_ip_by_interface(ifname, vrfname, psa.sa_sin.sin_family, ifip);
+			strtosa(ifip, &lsa);
+		}
 	}
 
 	/* Generate the corresponding key. */
-	gen_bfd_key(bk, &psa, &lsa, mhop, ifname, vrfname);
+	gen_bfd_key(bk, &psa, &lsa, mhop, ifname, vrfname, NULL);
 }
 
 struct session_iter {

bfdd/bfdd_nb_state.c

@@ -20,7 +20,7 @@
 const void *
 bfdd_bfd_sessions_single_hop_get_next(struct nb_cb_get_next_args *args)
 {
-	return bfd_session_next(args->list_entry, false);
+	return bfd_session_next(args->list_entry, false, BFD_MODE_TYPE_BFD);
 }
 
 int bfdd_bfd_sessions_single_hop_get_keys(struct nb_cb_get_keys_args *args)
@@ -50,7 +50,7 @@ bfdd_bfd_sessions_single_hop_lookup_entry(struct nb_cb_lookup_entry_args *args)
 
 	strtosa(dest_addr, &psa);
 	memset(&lsa, 0, sizeof(lsa));
-	gen_bfd_key(&bk, &psa, &lsa, false, ifname, vrf);
+	gen_bfd_key(&bk, &psa, &lsa, false, ifname, vrf, NULL);
 
 	return bfd_key_lookup(bk);
 }
@@ -323,7 +323,7 @@ bfdd_bfd_sessions_single_hop_stats_echo_packet_output_count_get_elem(
 const void *
 bfdd_bfd_sessions_multi_hop_get_next(struct nb_cb_get_next_args *args)
 {
-	return bfd_session_next(args->list_entry, true);
+	return bfd_session_next(args->list_entry, true, BFD_MODE_TYPE_BFD);
 }
 
 int bfdd_bfd_sessions_multi_hop_get_keys(struct nb_cb_get_keys_args *args)
@@ -354,7 +354,7 @@ bfdd_bfd_sessions_multi_hop_lookup_entry(struct nb_cb_lookup_entry_args *args)
 
 	strtosa(dest_addr, &psa);
 	strtosa(source_addr, &lsa);
-	gen_bfd_key(&bk, &psa, &lsa, true, NULL, vrf);
+	gen_bfd_key(&bk, &psa, &lsa, true, NULL, vrf, NULL);
 
 	return bfd_key_lookup(bk);
 }

lib/bfd.h

@@ -26,6 +26,8 @@ extern "C" {
 
 #define BFD_PROFILE_NAME_LEN 64
 
+#define BFD_NAME_SIZE 255
+
 const char *bfd_get_status_str(int status);
 
 extern void bfd_client_sendmsg(struct zclient *zclient, int command,
@@ -409,6 +411,8 @@ struct bfd_session_arg {
 	uint32_t min_tx;
 	/** Detection multiplier. */
 	uint32_t detection_multiplier;
+	/* bfd session name*/
+	char bfd_name[BFD_NAME_SIZE + 1];
 };
 
 /**