X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Fgre%2Fgre.c;h=f1bc6946416ba002dcb788866eae1c93d52fed52;hb=e5b94dded;hp=72c76fca5df197877980065d2f1ef3b2f4c3f8e4;hpb=8e22054209ae9c4f08dae16f1aff910d8c8d0b76;p=vpp.git

diff --git a/src/vnet/gre/gre.c b/src/vnet/gre/gre.c
index 72c76fca5df..f1bc6946416 100644
--- a/src/vnet/gre/gre.c
+++ b/src/vnet/gre/gre.c
@@ -18,6 +18,7 @@
 #include <vnet/vnet.h>
 #include <vnet/gre/gre.h>
 #include <vnet/adj/adj_midchain.h>
+#include <vnet/tunnel/tunnel_dp.h>
 
 extern gre_main_t gre_main;
 
@@ -213,6 +214,7 @@ gre_build_rewrite (vnet_main_t * vnm,
 		   vnet_link_t link_type, const void *dst_address)
 {
   gre_main_t *gm = &gre_main;
+  const ip46_address_t *dst;
   ip4_and_gre_header_t *h4;
   ip6_and_gre_header_t *h6;
   gre_header_t *gre;
@@ -221,6 +223,7 @@ gre_build_rewrite (vnet_main_t * vnm,
   u32 ti;
   u8 is_ipv6;
 
+  dst = dst_address;
   ti = gm->tunnel_index_by_sw_if_index[sw_if_index];
 
   if (~0 == ti)
@@ -241,7 +244,7 @@ gre_build_rewrite (vnet_main_t * vnm,
       h4->ip4.protocol = IP_PROTOCOL_GRE;
       /* fixup ip4 header length and checksum after-the-fact */
       h4->ip4.src_address.as_u32 = t->tunnel_src.ip4.as_u32;
-      h4->ip4.dst_address.as_u32 = t->tunnel_dst.fp_addr.ip4.as_u32;
+      h4->ip4.dst_address.as_u32 = dst->ip4.as_u32;
       h4->ip4.checksum = ip4_header_checksum (&h4->ip4);
     }
   else
@@ -256,8 +259,8 @@ gre_build_rewrite (vnet_main_t * vnm,
       /* fixup ip6 header length and checksum after-the-fact */
       h6->ip6.src_address.as_u64[0] = t->tunnel_src.ip6.as_u64[0];
       h6->ip6.src_address.as_u64[1] = t->tunnel_src.ip6.as_u64[1];
-      h6->ip6.dst_address.as_u64[0] = t->tunnel_dst.fp_addr.ip6.as_u64[0];
-      h6->ip6.dst_address.as_u64[1] = t->tunnel_dst.fp_addr.ip6.as_u64[1];
+      h6->ip6.dst_address.as_u64[0] = dst->ip6.as_u64[0];
+      h6->ip6.dst_address.as_u64[1] = dst->ip6.as_u64[1];
     }
 
   if (PREDICT_FALSE (t->type == GRE_TUNNEL_TYPE_ERSPAN))
@@ -272,11 +275,45 @@ gre_build_rewrite (vnet_main_t * vnm,
   return (rewrite);
 }
 
-#define is_v4_packet(_h) ((*(u8*) _h) & 0xF0) == 0x40
+static void
+gre44_fixup (vlib_main_t * vm,
+	     const ip_adjacency_t * adj, vlib_buffer_t * b0, const void *data)
+{
+  tunnel_encap_decap_flags_t flags;
+  ip4_and_gre_header_t *ip0;
+
+  ip0 = vlib_buffer_get_current (b0);
+  flags = pointer_to_uword (data);
+
+  /* Fixup the checksum and len fields in the GRE tunnel encap
+   * that was applied at the midchain node */
+  ip0->ip4.length =
+    clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
+  tunnel_encap_fixup_4o4 (flags, (ip4_header_t *) (ip0 + 1), &ip0->ip4);
+  ip0->ip4.checksum = ip4_header_checksum (&ip0->ip4);
+}
+
+static void
+gre64_fixup (vlib_main_t * vm,
+	     const ip_adjacency_t * adj, vlib_buffer_t * b0, const void *data)
+{
+  tunnel_encap_decap_flags_t flags;
+  ip4_and_gre_header_t *ip0;
+
+  ip0 = vlib_buffer_get_current (b0);
+  flags = pointer_to_uword (data);
+
+  /* Fixup the checksum and len fields in the GRE tunnel encap
+   * that was applied at the midchain node */
+  ip0->ip4.length =
+    clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
+  tunnel_encap_fixup_6o4 (flags, (ip6_header_t *) (ip0 + 1), &ip0->ip4);
+  ip0->ip4.checksum = ip4_header_checksum (&ip0->ip4);
+}
 
 static void
-gre4_fixup (vlib_main_t * vm,
-	    ip_adjacency_t * adj, vlib_buffer_t * b0, const void *data)
+grex4_fixup (vlib_main_t * vm,
+	     const ip_adjacency_t * adj, vlib_buffer_t * b0, const void *data)
 {
   ip4_header_t *ip0;
 
@@ -289,8 +326,44 @@ gre4_fixup (vlib_main_t * vm,
 }
 
 static void
-gre6_fixup (vlib_main_t * vm,
-	    ip_adjacency_t * adj, vlib_buffer_t * b0, const void *data)
+gre46_fixup (vlib_main_t * vm,
+	     const ip_adjacency_t * adj, vlib_buffer_t * b0, const void *data)
+{
+  tunnel_encap_decap_flags_t flags;
+  ip6_and_gre_header_t *ip0;
+
+  ip0 = vlib_buffer_get_current (b0);
+  flags = pointer_to_uword (data);
+
+  /* Fixup the payload length field in the GRE tunnel encap that was applied
+   * at the midchain node */
+  ip0->ip6.payload_length =
+    clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) -
+			  sizeof (*ip0));
+  tunnel_encap_fixup_4o6 (flags, (ip4_header_t *) (ip0 + 1), &ip0->ip6);
+}
+
+static void
+gre66_fixup (vlib_main_t * vm,
+	     const ip_adjacency_t * adj, vlib_buffer_t * b0, const void *data)
+{
+  tunnel_encap_decap_flags_t flags;
+  ip6_and_gre_header_t *ip0;
+
+  ip0 = vlib_buffer_get_current (b0);
+  flags = pointer_to_uword (data);
+
+  /* Fixup the payload length field in the GRE tunnel encap that was applied
+   * at the midchain node */
+  ip0->ip6.payload_length =
+    clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) -
+			  sizeof (*ip0));
+  tunnel_encap_fixup_6o6 (flags, (ip6_header_t *) (ip0 + 1), &ip0->ip6);
+}
+
+static void
+grex6_fixup (vlib_main_t * vm,
+	     const ip_adjacency_t * adj, vlib_buffer_t * b0, const void *data)
 {
   ip6_header_t *ip0;
 
@@ -303,29 +376,116 @@ gre6_fixup (vlib_main_t * vm,
 			  sizeof (*ip0));
 }
 
+/**
+ * return the appropriate fixup function given the overlay (link-type) and
+ * underlay (fproto) combination
+ */
+static adj_midchain_fixup_t
+gre_get_fixup (fib_protocol_t fproto, vnet_link_t lt)
+{
+  if (fproto == FIB_PROTOCOL_IP6 && lt == VNET_LINK_IP6)
+    return (gre66_fixup);
+  if (fproto == FIB_PROTOCOL_IP6 && lt == VNET_LINK_IP4)
+    return (gre46_fixup);
+  if (fproto == FIB_PROTOCOL_IP4 && lt == VNET_LINK_IP6)
+    return (gre64_fixup);
+  if (fproto == FIB_PROTOCOL_IP4 && lt == VNET_LINK_IP4)
+    return (gre44_fixup);
+  if (fproto == FIB_PROTOCOL_IP6 && lt == VNET_LINK_ETHERNET)
+    return (grex6_fixup);
+  if (fproto == FIB_PROTOCOL_IP4 && lt == VNET_LINK_ETHERNET)
+    return (grex4_fixup);
+
+  ASSERT (0);
+  return (gre44_fixup);
+}
+
 void
 gre_update_adj (vnet_main_t * vnm, u32 sw_if_index, adj_index_t ai)
 {
   gre_main_t *gm = &gre_main;
   gre_tunnel_t *t;
   adj_flags_t af;
-  u8 is_ipv6;
   u32 ti;
 
   ti = gm->tunnel_index_by_sw_if_index[sw_if_index];
   t = pool_elt_at_index (gm->tunnels, ti);
-  is_ipv6 = t->tunnel_dst.fp_proto == FIB_PROTOCOL_IP6 ? 1 : 0;
   af = ADJ_FLAG_MIDCHAIN_IP_STACK;
 
   if (VNET_LINK_ETHERNET == adj_get_link_type (ai))
     af |= ADJ_FLAG_MIDCHAIN_NO_COUNT;
 
   adj_nbr_midchain_update_rewrite
-    (ai, !is_ipv6 ? gre4_fixup : gre6_fixup, NULL, af,
-     gre_build_rewrite (vnm, sw_if_index, adj_get_link_type (ai), NULL));
+    (ai, gre_get_fixup (t->tunnel_dst.fp_proto,
+			adj_get_link_type (ai)),
+     uword_to_pointer (t->flags, void *), af,
+     gre_build_rewrite (vnm, sw_if_index, adj_get_link_type (ai),
+			&t->tunnel_dst.fp_addr));
 
   gre_tunnel_stack (ai);
 }
+
+adj_walk_rc_t
+mgre_mk_complete_walk (adj_index_t ai, void *data)
+{
+  mgre_walk_ctx_t *ctx = data;
+
+  adj_nbr_midchain_update_rewrite
+    (ai, gre_get_fixup (ctx->t->tunnel_dst.fp_proto,
+			adj_get_link_type (ai)),
+     uword_to_pointer (ctx->t->flags, void *),
+     ADJ_FLAG_MIDCHAIN_IP_STACK,
+     gre_build_rewrite (vnet_get_main (),
+			ctx->t->sw_if_index,
+			adj_get_link_type (ai),
+			&nhrp_entry_get_nh (ctx->ne)->fp_addr));
+
+  nhrp_entry_adj_stack (ctx->ne, ai);
+
+  return (ADJ_WALK_RC_CONTINUE);
+}
+
+adj_walk_rc_t
+mgre_mk_incomplete_walk (adj_index_t ai, void *data)
+{
+  gre_tunnel_t *t = data;
+
+  adj_nbr_midchain_update_rewrite (ai, gre_get_fixup (t->tunnel_dst.fp_proto,
+						      adj_get_link_type (ai)),
+				   NULL, ADJ_FLAG_NONE, NULL);
+
+  adj_midchain_delegate_unstack (ai);
+
+  return (ADJ_WALK_RC_CONTINUE);
+}
+
+void
+mgre_update_adj (vnet_main_t * vnm, u32 sw_if_index, adj_index_t ai)
+{
+  gre_main_t *gm = &gre_main;
+  ip_adjacency_t *adj;
+  nhrp_entry_t *ne;
+  gre_tunnel_t *t;
+  u32 ti;
+
+  adj = adj_get (ai);
+  ti = gm->tunnel_index_by_sw_if_index[sw_if_index];
+  t = pool_elt_at_index (gm->tunnels, ti);
+
+  ne = nhrp_entry_find (sw_if_index, &adj->sub_type.nbr.next_hop);
+
+  if (NULL == ne)
+    // no NHRP entry to provide the next-hop
+    return;
+
+  mgre_walk_ctx_t ctx = {
+    .t = t,
+    .ne = ne
+  };
+  adj_nbr_walk_nh (sw_if_index,
+		   adj->ia_nh_proto,
+		   &adj->sub_type.nbr.next_hop, mgre_mk_complete_walk, &ctx);
+}
 #endif /* CLIB_MARCH_VARIANT */
 
 typedef enum
@@ -530,6 +690,29 @@ format_gre_device (u8 * s, va_list * args)
   return s;
 }
 
+static int
+gre_tunnel_desc (u32 sw_if_index,
+		 ip46_address_t * src, ip46_address_t * dst, u8 * is_l2)
+{
+  gre_main_t *gm = &gre_main;
+  gre_tunnel_t *t;
+  u32 ti;
+
+  ti = gm->tunnel_index_by_sw_if_index[sw_if_index];
+
+  if (~0 == ti)
+    /* not one of ours */
+    return -1;
+
+  t = pool_elt_at_index (gm->tunnels, ti);
+
+  *src = t->tunnel_src;
+  *dst = t->tunnel_dst.fp_addr;
+  *is_l2 = t->type == GRE_TUNNEL_TYPE_TEB;
+
+  return (0);
+}
+
 /* *INDENT-OFF* */
 VNET_DEVICE_CLASS (gre_device_class) = {
   .name = "GRE tunnel device",
@@ -537,6 +720,7 @@ VNET_DEVICE_CLASS (gre_device_class) = {
   .format_device = format_gre_device,
   .format_tx_trace = format_gre_tx_trace,
   .admin_up_down_function = gre_interface_admin_up_down,
+  .ip_tun_desc = gre_tunnel_desc,
 #ifdef SOON
   .clear counter = 0;
 #endif
@@ -550,6 +734,15 @@ VNET_HW_INTERFACE_CLASS (gre_hw_interface_class) = {
   .update_adjacency = gre_update_adj,
   .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P,
 };
+
+VNET_HW_INTERFACE_CLASS (mgre_hw_interface_class) = {
+  .name = "mGRE",
+  .format_header = format_gre_header_with_length,
+  .unformat_header = unformat_gre_header,
+  .build_rewrite = gre_build_rewrite,
+  .update_adjacency = mgre_update_adj,
+  .flags = VNET_HW_INTERFACE_CLASS_FLAG_NBMA,
+};
 /* *INDENT-ON* */
 #endif /* CLIB_MARCH_VARIANT */