ip: Path MTU

[vpp.git] / src / vnet / adj / adj_nbr.c

diff --git a/src/vnet/adj/adj_nbr.c b/src/vnet/adj/adj_nbr.c
index 78bf6df..811d0b8 100644 (file)
--- a/src/vnet/adj/adj_nbr.c
+++ b/src/vnet/adj/adj_nbr.c
@@ -39,7 +39,20 @@ typedef struct adj_nbr_key_t_
 
 #define ADJ_NBR_ITF_OK(_proto, _itf)                   \
     (((_itf) < vec_len(adj_nbr_tables[_proto])) &&     \
-     (NULL != adj_nbr_tables[_proto][sw_if_index]))
+     (NULL != adj_nbr_tables[_proto][(_itf)]))
+
+#define ADJ_NBR_ASSERT_NH_PROTO(nh_proto, err)          \
+  do {                                                  \
+      ASSERT (nh_proto < FIB_PROTOCOL_IP_MAX);          \
+      const fib_protocol_t nh_proto__ = (nh_proto);     \
+      if (nh_proto__ >= FIB_PROTOCOL_IP_MAX)            \
+        {                                               \
+          clib_warning ("BUG: protocol %d > %d\n",      \
+                        (int)nh_proto__,                \
+                        FIB_PROTOCOL_IP_MAX);           \
+          return err;                                   \
+        }                                               \
+  } while (0)
 
 static void
 adj_nbr_insert (fib_protocol_t nh_proto,
@@ -50,6 +63,8 @@ adj_nbr_insert (fib_protocol_t nh_proto,
 {
     adj_nbr_key_t kv;
 
+    ADJ_NBR_ASSERT_NH_PROTO (nh_proto,);
+
     if (sw_if_index >= vec_len(adj_nbr_tables[nh_proto]))
     {
        vec_validate(adj_nbr_tables[nh_proto], sw_if_index);
@@ -75,6 +90,8 @@ adj_nbr_remove (adj_index_t ai,
 {
     adj_nbr_key_t kv;
 
+    ADJ_NBR_ASSERT_NH_PROTO (nh_proto,);
+
     if (!ADJ_NBR_ITF_OK(nh_proto, sw_if_index))
        return;
 
@@ -97,6 +114,8 @@ adj_nbr_find (fib_protocol_t nh_proto,
     adj_nbr_key_t kv;
     uword *p;
 
+    ADJ_NBR_ASSERT_NH_PROTO (nh_proto, ADJ_INDEX_INVALID);
+
     ADJ_NBR_SET_KEY(kv, link_type, nh_addr);
 
     if (!ADJ_NBR_ITF_OK(nh_proto, sw_if_index))
@@ -203,6 +222,27 @@ adj_nbr_alloc (fib_protocol_t nh_proto,
     return (adj);
 }
 
+void
+adj_nbr_set_mtu (adj_index_t adj_index, u16 mtu)
+{
+    ip_adjacency_t *adj;
+
+    ASSERT(ADJ_INDEX_INVALID != adj_index);
+
+    adj = adj_get(adj_index);
+
+    if (0 == mtu)
+        vnet_rewrite_update_mtu(vnet_get_main(), adj->ia_link,
+                                &adj->rewrite_header);
+    else
+    {
+        vnet_rewrite_update_mtu(vnet_get_main(), adj->ia_link,
+                                &adj->rewrite_header);
+        adj->rewrite_header.max_l3_packet_bytes =
+            clib_min (adj->rewrite_header.max_l3_packet_bytes, mtu);
+    }
+}
+
 /*
  * adj_nbr_add_or_lock
  *
@@ -249,13 +289,13 @@ adj_nbr_add_or_lock (fib_protocol_t nh_proto,
         * So ask the interface to do it.
         */
        vnet_update_adjacency_for_sw_interface(vnm, sw_if_index, adj_index);
+        adj_delegate_adj_created(adj_get(adj_index));
     }
     else
     {
        adj_lock(adj_index);
     }
 
-    adj_delegate_adj_created(adj_get(adj_index));
     return (adj_index);
 }
 
@@ -557,6 +597,8 @@ adj_nbr_walk (u32 sw_if_index,
     adj_index_t ai, *ais, *aip;
     adj_nbr_key_t *key;
 
+    ADJ_NBR_ASSERT_NH_PROTO (adj_nh_proto,);
+
     if (!ADJ_NBR_ITF_OK(adj_nh_proto, sw_if_index))
        return;
 
@@ -645,6 +687,8 @@ adj_nbr_walk_nh (u32 sw_if_index,
                 adj_walk_cb_t cb,
                 void *ctx)
 {
+    ADJ_NBR_ASSERT_NH_PROTO (adj_nh_proto,);
+
     if (!ADJ_NBR_ITF_OK(adj_nh_proto, sw_if_index))
        return;
 
@@ -1032,12 +1076,14 @@ const static dpo_vft_t adj_nbr_dpo_vft = {
     .dv_format = format_adj_nbr,
     .dv_mem_show = adj_mem_show,
     .dv_get_urpf = adj_dpo_get_urpf,
+    .dv_get_mtu = adj_dpo_get_mtu,
 };
 const static dpo_vft_t adj_nbr_incompl_dpo_vft = {
     .dv_lock = adj_dpo_lock,
     .dv_unlock = adj_dpo_unlock,
     .dv_format = format_adj_nbr_incomplete,
     .dv_get_urpf = adj_dpo_get_urpf,
+    .dv_get_mtu = adj_dpo_get_mtu,
 };
 
 /**