;;; 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-encap-skel.el - tunnel interface output skeleton (require 'skeleton) (define-skeleton skel-tunnel-encap "Insert a tunnel encap 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 <vppinfra/error.h> #include <vppinfra/hash.h> #include <vnet/vnet.h> #include <vnet/ip/ip.h> #include <vnet/ethernet/ethernet.h> #include <vnet/" encap-stack "/" encap_stack ".h> /* Statistics (not really errors) */ #define foreach_" encap_stack "_encap_error \\ _(ENCAPSULATED, \"good packets encapsulated\") static char * " encap_stack "_encap_error_strings[] = { #define _(sym,string) string, foreach_" encap_stack "_encap_error #undef _ }; typedef enum { #define _(sym,str) " ENCAP_STACK "_ENCAP_ERROR_##sym, foreach_" encap_stack "_encap_error #undef _ " ENCAP_STACK "_ENCAP_N_ERROR, } " encap_stack "_encap_error_t; typedef enum { " ENCAP_STACK "_ENCAP_NEXT_IP4_LOOKUP, " ENCAP_STACK "_ENCAP_NEXT_DROP, " ENCAP_STACK "_ENCAP_N_NEXT, } " encap_stack "_encap_next_t; typedef struct { u32 tunnel_index; } " encap_stack "_encap_trace_t; u8 * format_" encap_stack "_encap_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 "_encap_trace_t * t = va_arg (*args, " encap_stack "_encap_trace_t *); s = format (s, \"" ENCAP-STACK ": tunnel %d\", t->tunnel_index); return s; } /* $$$$ FIXME adjust to match the rewrite string */ #define foreach_fixed_header_offset \\ _(0) _(1) _(2) _(3) _(FIXME) static uword " encap_stack "_encap (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { u32 n_left_from, next_index, * from, * to_next; " encap_stack "_main_t * ngm = &" encap_stack "_main; vnet_main_t * vnm = ngm->vnet_main; u32 pkts_encapsulated = 0; u16 old_l0 = 0, old_l1 = 0; from = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; next_index = node->cached_next_index; while (n_left_from > 0) { u32 n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); #if 0 /* $$$ 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 "_ENCAP_NEXT_IP4_LOOKUP; 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 "_ENCAP_NEXT_IP4_LOOKUP; vnet_hw_interface_t * hi0; ip4_header_t * ip0; udp_header_t * udp0; u64 * copy_src0, * copy_dst0; u32 * copy_src_last0, * copy_dst_last0; " encap_stack "_tunnel_t * t0; u16 new_l0; ip_csum_t sum0; 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); /* 1-wide cache? */ hi0 = vnet_get_sup_hw_interface (vnm, vnet_buffer(b0)->sw_if_index[VLIB_TX]); t0 = pool_elt_at_index (ngm->tunnels, hi0->dev_instance); ASSERT(vec_len(t0->rewrite) >= 24); /* Apply the rewrite string. $$$$ vnet_rewrite? */ vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite)); ip0 = vlib_buffer_get_current(b0); /* Copy the fixed header */ copy_dst0 = (u64 *) ip0; copy_src0 = (u64 *) t0->rewrite; ASSERT (sizeof (ip4_udp_" encap_stack "_header_t) == FIXME); /* Copy first N octets 8-bytes at a time */ #define _(offs) copy_dst0[offs] = copy_src0[offs]; foreach_fixed_header_offset; #undef _ #if 0 /* needed if encap not a multiple of 8 bytes */ /* Last 4 octets. Hopefully gcc will be our friend */ copy_dst_last0 = (u32 *)(©_dst0[FIXME]); copy_src_last0 = (u32 *)(©_src0[FIXME]); copy_dst_last0[0] = copy_src_last0[0]; #endif /* fix the <bleep>ing outer-IP checksum */ sum0 = ip0->checksum; /* old_l0 always 0, see the rewrite setup */ new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)); sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t, length /* changed member */); ip0->checksum = ip_csum_fold (sum0); ip0->length = new_l0; /* Fix UDP length */ udp0 = (udp_header_t *)(ip0+1); new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) - sizeof (*ip0)); udp0->length = new_l0; /* Reset to look up tunnel partner in the configured FIB */ vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index; pkts_encapsulated ++; if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { " encap_stack "_encap_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->tunnel_index = t0 - ngm->tunnels; } 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, node->node_index, " ENCAP_STACK "_ENCAP_ERROR_ENCAPSULATED, pkts_encapsulated); return from_frame->n_vectors; } VLIB_REGISTER_NODE (" encap_stack "_encap_node) = { .function = " encap_stack "_encap, .name = \"" encap-stack "-encap\", .vector_size = sizeof (u32), .format_trace = format_" encap_stack "_encap_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(" encap_stack "_encap_error_strings), .error_strings = " encap_stack "_encap_error_strings, .n_next_nodes = " ENCAP_STACK "_ENCAP_N_NEXT, .next_nodes = { [" ENCAP_STACK "_ENCAP_NEXT_IP4_LOOKUP] = \"ip4-lookup\", [" ENCAP_STACK "_ENCAP_NEXT_DROP] = \"error-drop\", }, }; ")