--- /dev/null
+;;; tunnel-decap-skel.el - tunnel decapsulation skeleton
+
+(require 'skeleton)
+
+(define-skeleton skel-tunnel-decap
+"Insert a tunnel decap implementation"
+nil
+'(setq encap_stack (skeleton-read "encap_stack (e.g ip4_udp_lisp): "))
+'(setq ENCAP_STACK (upcase encap_stack))
+'(setq encap-stack (replace-regexp-in-string "_" "-" encap_stack))
+'(setq ENCAP-STACK (upcase encap-stack))
+"
+#include <vlib/vlib.h>
+#include <vnet/pg/pg.h>
+#include <vnet/" encap-stack "/" encap_stack ".h>
+
+typedef struct {
+ u32 next_index;
+ u32 tunnel_index;
+ u32 error;
+ " encap_stack "_header_t h;
+} " encap_stack "_rx_trace_t;
+
+static u8 * format_" encap_stack "_rx_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ " encap_stack "_rx_trace_t * t = va_arg (*args, " encap_stack "_rx_trace_t *);
+
+ if (t->tunnel_index != ~0)
+ {
+ s = format (s, \"" ENCAP-STACK ": tunnel %d next %d error %d\",
+ t->tunnel_index, t->next_index, t->error);
+ }
+ else
+ {
+ s = format (s, \"" ENCAP-STACK ": no tunnel next %d error %d\\n\",
+ t->next_index, t->error);
+ }
+ s = format (s, \"\\n %U\", format_" encap_stack "_header_with_length, &t->h,
+ (u32) sizeof (t->h) /* max size */);
+ return s;
+}
+
+static uword
+" encap_stack "_input (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ u32 n_left_from, next_index, * from, * to_next;
+ " encap_stack "_main_t * ngm = &" encap_stack "_main;
+ u32 last_tunnel_index = ~0;
+ " encap_stack "_tunnel_key_t last_key;
+ u32 pkts_decapsulated = 0;
+
+ memset (&last_key, 0xff, sizeof (last_key));
+
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = from_frame->n_vectors;
+
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index,
+ to_next, n_left_to_next);
+
+#if 0 /* $$$ dual loop when the single loop works */
+ while (n_left_from >= 4 && n_left_to_next >= 2)
+ {
+ u32 bi0, bi1;
+ vlib_buffer_t * b0, * b1;
+ nsh_unicast_header_t * h0, * h1;
+ u32 label0, label1;
+ u32 next0, next1;
+ uword * p0, * p1;
+
+ /* Prefetch next iteration. */
+ {
+ vlib_buffer_t * p2, * p3;
+
+ p2 = vlib_get_buffer (vm, from[2]);
+ p3 = vlib_get_buffer (vm, from[3]);
+
+ vlib_prefetch_buffer_header (p2, LOAD);
+ vlib_prefetch_buffer_header (p3, LOAD);
+
+ CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
+ CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
+ }
+
+ bi0 = from[0];
+ bi1 = from[1];
+ to_next[0] = bi0;
+ to_next[1] = bi1;
+ from += 2;
+ to_next += 2;
+ n_left_to_next -= 2;
+ n_left_from -= 2;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+
+ h0 = vlib_buffer_get_current (b0);
+ h1 = vlib_buffer_get_current (b1);
+
+ next0 = next1 = " ENCAP_STACK "_INPUT_NEXT_IP4_INPUT;
+
+ label0 = clib_net_to_host_u32 (h0->label_exp_s_ttl);
+ label1 = clib_net_to_host_u32 (h1->label_exp_s_ttl);
+
+ /*
+ * Translate label contents into a fib index.
+ * This is a decent sanity check, and guarantees
+ * a sane FIB for the downstream lookup
+ */
+ label0 = vnet_nsh_uc_get_label (label0);
+ label1 = vnet_nsh_uc_get_label (label1);
+
+ /* If 2xlabels match, and match the 1-wide cache, use it */
+ if (label0 == label1 && rt->last_label == label0)
+ {
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = rt->last_fib_index;
+ vnet_buffer(b1)->sw_if_index[VLIB_TX] = rt->last_fib_index;
+ }
+ else
+ {
+ p0 = hash_get (rt->mm->fib_index_by_nsh_label, label0);
+ if (PREDICT_FALSE (p0 == 0))
+ {
+ next0 = " ENCAP_STACK "_INPUT_NEXT_DROP;
+ b0->error = node->errors[NSH_ERROR_BAD_LABEL];
+ }
+ else
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = p0[0];
+
+ p1 = hash_get (rt->mm->fib_index_by_nsh_label, label1);
+ if (PREDICT_FALSE (p1 == 0))
+ {
+ next1 = " ENCAP_STACK "_INPUT_NEXT_DROP;
+ b1->error = node->errors[NSH_ERROR_BAD_LABEL];
+ }
+ else
+ {
+ vnet_buffer(b1)->sw_if_index[VLIB_TX] = p1[0];
+ rt->last_fib_index = p1[0];
+ rt->last_label = label1;
+ }
+ }
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ nsh_rx_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->label_exp_s_ttl = label0;
+ }
+ if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ nsh_rx_trace_t *tr = vlib_add_trace (vm, node,
+ b1, sizeof (*tr));
+ tr->label_exp_s_ttl = label1;
+ }
+
+ vlib_buffer_advance (b0, sizeof (*h0));
+ vlib_buffer_advance (b1, sizeof (*h1));
+
+ vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, next0, next1);
+ }
+#endif
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t * b0;
+ u32 next0;
+ " encap_stack "_header_t * iuX0;
+ uword * p0;
+ u32 tunnel_index0;
+ " encap_stack "_tunnel_t * t0;
+ " encap_stack "_tunnel_key_t key0;
+ u32 error0;
+
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+
+ /*
+ * udp leaves current_data pointing at the tunnel header
+ * $$$$ FIXME
+ */
+ vlib_buffer_advance
+ (b0, -(word)(sizeof(udp_header_t)+sizeof(ip4_header_t)));
+
+ iuX0 = vlib_buffer_get_current (b0);
+
+ /* pop (ip, udp, lisp-gpe) */
+ vlib_buffer_advance (b0, sizeof (*iuX0));
+
+ tunnel_index0 = ~0;
+ error0 = 0;
+ next0 = " ENCAP_STACK "_INPUT_NEXT_DROP;
+
+ key0.src = iuX0->ip4.src_address.as_u32;
+ key0.iid = iuX0->lisp.iid;
+
+ /* $$$ validate key comparison */
+ if (PREDICT_FALSE ((key0.as_u64[0] != last_key.as_u64[0])))
+ {
+ p0 = hash_get_mem (ngm->" encap_stack "_tunnel_by_key, &key0);
+
+ if (p0 == 0)
+ {
+ error0 = " ENCAP_STACK "_ERROR_NO_SUCH_TUNNEL;
+ goto trace0;
+ }
+
+ last_key.as_u64[0] = key0.as_u64[0];
+ tunnel_index0 = last_tunnel_index = p0[0];
+ }
+ else
+ tunnel_index0 = last_tunnel_index;
+
+ t0 = pool_elt_at_index (ngm->tunnels, tunnel_index0);
+
+ next0 = t0->decap_next_index;
+
+ /* Required to make the l2 tag push / pop code work on l2 subifs */
+ vnet_update_l2_len (b0);
+
+ /*
+ * ip[46] lookup in the configured FIB
+ * " encap-stack ", here's the encap tunnel sw_if_index
+ */
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index;
+ pkts_decapsulated ++;
+
+ trace0:
+ b0->error = error0 ? node->errors[error0] : 0;
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ " encap_stack "_rx_trace_t *tr
+ = vlib_add_trace (vm, node, b0, sizeof (*tr));
+ tr->next_index = next0;
+ tr->error = error0;
+ tr->tunnel_index = tunnel_index0;
+ tr->h = iuX0->lisp;
+ }
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+ vlib_node_increment_counter (vm, " encap_stack "_input_node.index,
+ " ENCAP_STACK "_ERROR_DECAPSULATED,
+ pkts_decapsulated);
+ return from_frame->n_vectors;
+}
+
+static char * " encap_stack "_error_strings[] = {
+#define " encap_stack "_error(n,s) s,
+#include <vnet/" encap-stack "/" encap_stack "_error.def>
+#undef " encap_stack "_error
+#undef _
+};
+
+VLIB_REGISTER_NODE (" encap_stack "_input_node) = {
+ .function = \"" encap_stack "_input\",
+ .name = \"" encap-stack "-input\",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+
+ .n_errors = " ENCAP_STACK "_N_ERROR,
+ .error_strings = " encap_stack "_error_strings,
+
+ .n_next_nodes = " ENCAP_STACK "_INPUT_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [" ENCAP_STACK "_INPUT_NEXT_##s] = n,
+ foreach_" encap_stack "_input_next
+#undef _
+ },
+
+ .format_buffer = format_" encap_stack "_header_with_length,
+ .format_trace = format_" encap_stack "_rx_trace,
+ // $$$$ .unformat_buffer = unformat_" encap_stack "_header,
+};
+
+")
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