From 26dd61ee7f91c15157601b2404de5b6500a6061c Mon Sep 17 00:00:00 2001
From: Ondrej Zajicek <santiago@crfreenet.org>
Date: Mon, 4 Mar 2024 23:20:53 +0100
Subject: BFD: Add arguments to 'show bfd sessions' command

Add several arguments to 'show bfd sessions' command to filter
the list of sessions.
---
 conf/confbase.Y    |  1 +
 doc/bird.sgml      |  5 +++--
 proto/bfd/bfd.c    | 17 +++++++++++++----
 proto/bfd/bfd.h    | 13 ++++++++++++-
 proto/bfd/config.Y | 34 ++++++++++++++++++----------------
 5 files changed, 47 insertions(+), 23 deletions(-)

diff --git a/conf/confbase.Y b/conf/confbase.Y
index b2471198..ed3c1e6e 100644
--- a/conf/confbase.Y
+++ b/conf/confbase.Y
@@ -89,6 +89,7 @@ CF_DECLS
   struct lsadb_show_data *ld;
   struct mrt_dump_data *md;
   struct mpls_show_ranges_cmd *msrc;
+  struct bfd_show_sessions_cmd *bssc;
   struct iface *iface;
   void *g;
   btime time;
diff --git a/doc/bird.sgml b/doc/bird.sgml
index aeecb1dc..ced927d4 100644
--- a/doc/bird.sgml
+++ b/doc/bird.sgml
@@ -1288,8 +1288,9 @@ This argument can be omitted if there exists only a single instance.
 	<tag><label id="cli-show-static">show static [<m/name/]</tag>
 	Show detailed information about static routes.
 
-	<tag><label id="cli-show-bfd-sessions">show bfd sessions [<m/name/]</tag>
-	Show information about BFD sessions.
+	<tag><label id="cli-show-bfd-sessions">show bfd sessions [<m/name/] [address (<m/IP/|<m/prefix/)] [(interface|dev) "<m/name/"] [ipv4|ipv6] [direct|multihop] [all]</tag>
+	Show information about BFD sessions. Options could be used to filter
+	entries, or in the case of the option <cf/all/ to give verbose output.
 
 	<tag><label id="cli-show-symbols">show symbols [table|filter|function|protocol|template|roa|<m/symbol/]</tag>
 	Show the list of symbols defined in the configuration (names of
diff --git a/proto/bfd/bfd.c b/proto/bfd/bfd.c
index b9461085..41d8e210 100644
--- a/proto/bfd/bfd.c
+++ b/proto/bfd/bfd.c
@@ -1256,7 +1256,7 @@ bfd_show_session(struct bfd_session *s, int details)
 }
 
 void
-bfd_show_sessions(struct proto *P, int details, net_addr addr)
+bfd_show_sessions(struct proto *P, struct bfd_show_sessions_cmd *args)
 {
   struct bfd_proto *p = (struct bfd_proto *) P;
 
@@ -1267,16 +1267,25 @@ bfd_show_sessions(struct proto *P, int details, net_addr addr)
   }
 
   cli_msg(-1020, "%s:", p->p.name);
-  if (!details)
+  if (!args->verbose)
     cli_msg(-1020, "%-25s %-10s %-10s %-12s  %8s %8s",
 	  "IP address", "Interface", "State", "Since", "Interval", "Timeout");
 
   HASH_WALK(p->session_hash_id, next_id, s)
   {
-    if (addr.type != 0 && !ipa_in_netX(s->addr, &addr))
+    if (args->address.type && !ipa_in_netX(s->addr, &args->address))
+      continue;
+
+    if (args->iface && (s->ifa->iface != args->iface))
+      continue;
+
+    if (ipa_is_ip4(s->addr) ? args->ipv6 :  args->ipv4)
+      continue;
+
+    if (s->ifa->iface ? args->multihop : args->direct)
       continue;
 
-    bfd_show_session(s, details);
+    bfd_show_session(s, args->verbose);
   }
   HASH_WALK_END;
 }
diff --git a/proto/bfd/bfd.h b/proto/bfd/bfd.h
index 83c1c884..e711bc80 100644
--- a/proto/bfd/bfd.h
+++ b/proto/bfd/bfd.h
@@ -172,6 +172,17 @@ struct bfd_session
   u32 tx_csn_time;			/* Timestamp of last tx_csn change */
 };
 
+struct bfd_show_sessions_cmd {
+  net_addr address;
+  struct iface *iface;
+  struct symbol *name;
+  u8 verbose;
+  u8 ipv4;
+  u8 ipv6;
+  u8 direct;
+  u8 multihop;
+};
+
 
 extern const char *bfd_state_names[];
 
@@ -218,7 +229,7 @@ static inline void bfd_unlock_sessions(struct bfd_proto *p) { pthread_spin_unloc
 struct bfd_session * bfd_find_session_by_id(struct bfd_proto *p, u32 id);
 struct bfd_session * bfd_find_session_by_addr(struct bfd_proto *p, ip_addr addr, uint ifindex);
 void bfd_session_process_ctl(struct bfd_session *s, u8 flags, u32 old_tx_int, u32 old_rx_int);
-void bfd_show_sessions(struct proto *P, int details, net_addr addr);
+void bfd_show_sessions(struct proto *P, struct bfd_show_sessions_cmd *args);
 
 /* packets.c */
 void bfd_send_ctl(struct bfd_proto *p, struct bfd_session *s, int final);
diff --git a/proto/bfd/config.Y b/proto/bfd/config.Y
index da687b5f..4edc13d9 100644
--- a/proto/bfd/config.Y
+++ b/proto/bfd/config.Y
@@ -29,7 +29,7 @@ CF_KEYWORDS(BFD, MIN, IDLE, RX, TX, INTERVAL, MULTIPLIER, PASSIVE,
 %type <iface> bfd_neigh_iface
 %type <a> bfd_neigh_local
 %type <i> bfd_neigh_multihop bfd_auth_type
-%type <net> opt_addr
+%type <bssc> bfd_show_sessions_args
 
 CF_GRAMMAR
 
@@ -182,24 +182,26 @@ bfd_neighbor: ipa bfd_neigh_iface bfd_neigh_local bfd_neigh_multihop
     cf_error("Multihop neighbor requires specified local address");
 };
 
-opt_addr:
-  /* empty */ {
-    net_addr addr;
-    addr.type = 0;
-    $$ = addr; }
- | net_ip4_
- | net_ip6_
- | IP4 { net_fill_ip4(&($$), $1, IP4_MAX_PREFIX_LENGTH); }
- | IP6 { net_fill_ip6(&($$), $1, IP6_MAX_PREFIX_LENGTH); }
-
-
 
 CF_CLI_HELP(SHOW BFD, ..., [[Show information about BFD protocol]]);
-CF_CLI(SHOW BFD SESSIONS, optproto opt_addr, [<name>] [<addr>], [[Show information about BFD sessions]])
-{ PROTO_WALK_CMD($4, &proto_bfd, p) bfd_show_sessions(p, 0, $5); };
 
-CF_CLI(SHOW BFD SESSIONS ALL, optproto opt_addr, [<name>] [<addr>], [[Show information about BFD sessions]])
-{ PROTO_WALK_CMD($5, &proto_bfd, p) bfd_show_sessions(p, 1, $6); };
+CF_CLI_HELP(SHOW BFD SESSIONS, ..., [[Show information about BFD sessions]]);
+CF_CLI(SHOW BFD SESSIONS, bfd_show_sessions_args, [<name>] [address <ip|prefix>] [(interface|dev) \"<name>\"] [ipv4|ipv6] [direct|multihop] [all], [[Show information about BFD sessions]])
+{ PROTO_WALK_CMD($4->name, &proto_bfd, p) bfd_show_sessions(p, $4); };
+
+bfd_show_sessions_args:
+   /* empty */ { $$ = cfg_allocz(sizeof(struct bfd_show_sessions_cmd)); }
+ | bfd_show_sessions_args CF_SYM_KNOWN { cf_assert_symbol($2, SYM_PROTO); $$->name = $2; }
+ | bfd_show_sessions_args ADDRESS net_or_ipa { net_copy(&($$->address), &($3)); }
+ | bfd_show_sessions_args INTERFACE text { $$->iface = if_get_by_name($3); }
+ | bfd_show_sessions_args DEV text { $$->iface = if_get_by_name($3); }
+ | bfd_show_sessions_args ALL { $$->verbose = 1; }
+ | bfd_show_sessions_args IPV4 { $$->ipv4 = 1; if ($$->ipv6) cf_error("Options 'ipv4' and 'ipv6' are mutually exclusive"); }
+ | bfd_show_sessions_args IPV6 { $$->ipv6 = 1; if ($$->ipv4) cf_error("Options 'ipv4' and 'ipv6' are mutually exclusive"); }
+ | bfd_show_sessions_args DIRECT { $$->direct = 1; if ($$->multihop) cf_error("Options 'direct' and 'multihop' are mutually exclusive"); }
+ | bfd_show_sessions_args MULTIHOP { $$->multihop = 1; if ($$->direct) cf_error("Options 'direct' and 'multihop' are mutually exclusive"); }
+ ;
+
 
 CF_CODE
 
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