From 45723b8d305c7c6d034e16fcbf1904fd72dd6bb2 Mon Sep 17 00:00:00 2001
From: Mohammed Hawari <mohammed@hawari.fr>
Date: Fri, 5 Feb 2021 15:40:00 +0100
Subject: ip: extend punt CLI for exception packets

Change-Id: I20e48a5ac8068eccb8d998346d35227c4802bb68
Signed-off-by: Mohammed Hawari <mohammed@hawari.fr>
Type: feature
---
 src/vnet/ip/punt.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 src/vnet/ip/punt.h | 42 ++++++++++++++++++++++++++++++++++++++----
 2 files changed, 81 insertions(+), 4 deletions(-)

(limited to 'src/vnet/ip')

diff --git a/src/vnet/ip/punt.c b/src/vnet/ip/punt.c
index 7cdb5fcc084..6fb8dd58776 100644
--- a/src/vnet/ip/punt.c
+++ b/src/vnet/ip/punt.c
@@ -405,6 +405,32 @@ punt_l4_add_del (vlib_main_t * vm,
     }
 }
 
+/**
+ * @brief Request exception traffic punt.
+ *
+ * @param reason   Punting reason
+ *
+ * @returns 0 on success, non-zero value otherwise
+ */
+static clib_error_t *
+punt_exception_add_del (vlib_punt_reason_t reason, bool is_add)
+{
+  punt_main_t *pm = &punt_main;
+  int rv = 0;
+  vnet_punt_reason_flag_t flag = vlib_punt_reason_get_flags (reason);
+  const char *node_name =
+    vnet_punt_reason_flag_is_IP6_PACKET (flag) ? "ip6-punt" : "ip4-punt";
+  if (is_add)
+    rv = vlib_punt_register (pm->hdl, reason, node_name);
+  else
+    rv = vlib_punt_unregister (pm->hdl, reason, node_name);
+  if (!rv)
+    return 0;
+  else
+    return clib_error_return (0, is_add ? "Existing punting registration..." :
+					  "Punting registration not found...");
+}
+
 clib_error_t *
 vnet_punt_add_del (vlib_main_t * vm, const punt_reg_t * pr, bool is_add)
 {
@@ -414,6 +440,7 @@ vnet_punt_add_del (vlib_main_t * vm, const punt_reg_t * pr, bool is_add)
       return (punt_l4_add_del (vm, pr->punt.l4.af, pr->punt.l4.protocol,
 			       pr->punt.l4.port, is_add));
     case PUNT_TYPE_EXCEPTION:
+      return punt_exception_add_del (pr->punt.exception.reason, is_add);
     case PUNT_TYPE_IP_PROTO:
       break;
     }
@@ -449,6 +476,9 @@ punt_cli (vlib_main_t * vm,
     {
       if (unformat (input, "del"))
 	is_add = false;
+      else if (unformat (input, "reason %U", unformat_punt_reason,
+			 &pr.punt.exception.reason))
+	pr.type = PUNT_TYPE_EXCEPTION;
       else if (unformat (input, "ipv4"))
 	pr.punt.l4.af = AF_IP4;
       else if (unformat (input, "ipv6"))
@@ -809,6 +839,19 @@ ip_punt_init (vlib_main_t * vm)
   return (error);
 }
 
+u8 *
+format_vnet_punt_reason_flags (u8 *s, va_list *args)
+{
+  vnet_punt_reason_flag_t flag = va_arg (*args, int);
+#define _(pos, len, value, name, str)                                         \
+  if (vnet_punt_reason_flag_is_##name (flag))                                 \
+    s = format (s, "%s ", str);
+
+  foreach_vnet_punt_reason_flag
+#undef _
+    return (s);
+}
+
 VLIB_INIT_FUNCTION (ip_punt_init);
 
 static clib_error_t *
diff --git a/src/vnet/ip/punt.h b/src/vnet/ip/punt.h
index 33124846ba6..858ea531ef7 100644
--- a/src/vnet/ip/punt.h
+++ b/src/vnet/ip/punt.h
@@ -24,17 +24,49 @@
 #include <stdbool.h>
 #include <vnet/ip/ip.h>
 
+/* Punting reason flags bitfield
+ * (position, length, value, name, string)
+ */
+#define foreach_vnet_punt_reason_flag                                         \
+  _ (0, 1, 0, IP4_PACKET, "ip4-packet")                                       \
+  _ (0, 1, 1, IP6_PACKET, "ip6-packet")
+
+typedef enum vnet_punt_reason_flag_t_
+{
+#define _(pos, len, value, name, str)                                         \
+  VNET_PUNT_REASON_F_##name = ((value) << (pos)),
+  foreach_vnet_punt_reason_flag
+#undef _
+} __clib_packed vnet_punt_reason_flag_t;
+
+enum vnet_punt_reason_flag_mask_t_
+{
+#define _(pos, len, value, name, str)                                         \
+  VNET_PUNT_REASON_F_MASK_##name = (((1 << (len)) - 1) << (pos)),
+  foreach_vnet_punt_reason_flag
+#undef _
+};
+
+/* predicates associated with vlib_punt_reason_flag_t*/
+#define _(pos, len, value, name, str)                                         \
+  static_always_inline int vnet_punt_reason_flag_is_##name (                  \
+    vnet_punt_reason_flag_t f)                                                \
+  {                                                                           \
+    return (f & VNET_PUNT_REASON_F_MASK_##name) == VNET_PUNT_REASON_F_##name; \
+  }
+foreach_vnet_punt_reason_flag
+#undef _
+
 #define foreach_punt_type                       \
   _(L4, "l4")                                   \
   _(EXCEPTION, "exception")                     \
   _(IP_PROTO, "ip-proto")
 
-typedef enum punt_type_t_
-{
+  typedef enum punt_type_t_ {
 #define _(v, s) PUNT_TYPE_##v,
-  foreach_punt_type
+    foreach_punt_type
 #undef _
-} punt_type_t;
+  } punt_type_t;
 
 typedef struct punt_l4_t_
 {
@@ -138,6 +170,8 @@ typedef walk_rc_t (*punt_client_walk_cb_t) (const punt_client_t * pc,
 extern void punt_client_walk (punt_type_t pt,
 			      punt_client_walk_cb_t cb, void *ctx);
 
+extern u8 *format_vnet_punt_reason_flags (u8 *s, va_list *args);
+
 /*
  * inlines for the data-plane
  */
-- 
cgit 1.2.3-korg