;;; Copyright (c) 2016 Cisco and/or its affiliates. ;;; Licensed under the Apache License, Version 2.0 (the "License"); ;;; you may not use this file except in compliance with the License. ;;; You may obtain a copy of the License at: ;;; ;;; http://www.apache.org/licenses/LICENSE-2.0 ;;; ;;; Unless required by applicable law or agreed to in writing, software ;;; distributed under the License is distributed on an "AS IS" BASIS, ;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. ;;; See the License for the specific language governing permissions and ;;; limitations under the License. ;;; 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, }; ")