8d0f2f0031
Change-Id: I105375c653b1a1dce8f0f71005b281ff137c6f42 Signed-off-by: Dave Barach <dave@barachs.net>
259 lines
7.8 KiB
EmacsLisp
259 lines
7.8 KiB
EmacsLisp
;;; Copyright (c) 2016 Cisco and/or its affiliates.
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;;; Licensed under the Apache License, Version 2.0 (the "License");
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;;; you may not use this file except in compliance with the License.
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;;; You may obtain a copy of the License at:
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;;;
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;;; http://www.apache.org/licenses/LICENSE-2.0
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;;;
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;;; Unless required by applicable law or agreed to in writing, software
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;;; distributed under the License is distributed on an "AS IS" BASIS,
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;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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;;; See the License for the specific language governing permissions and
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;;; limitations under the License.
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;;; tunnel-encap-skel.el - tunnel interface output skeleton
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(require 'skeleton)
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(define-skeleton skel-tunnel-encap
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"Insert a tunnel encap implementation"
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nil
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'(setq encap_stack (skeleton-read "encap_stack (e.g ip4_udp_lisp): "))
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'(setq ENCAP_STACK (upcase encap_stack))
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'(setq encap-stack (replace-regexp-in-string "_" "-" encap_stack))
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'(setq ENCAP-STACK (upcase encap-stack))
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"
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#include <vppinfra/error.h>
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#include <vppinfra/hash.h>
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#include <vnet/vnet.h>
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#include <vnet/ip/ip.h>
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#include <vnet/ethernet/ethernet.h>
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#include <vnet/" encap-stack "/" encap_stack ".h>
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/* Statistics (not really errors) */
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#define foreach_" encap_stack "_encap_error \\
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_(ENCAPSULATED, \"good packets encapsulated\")
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static char * " encap_stack "_encap_error_strings[] = {
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#define _(sym,string) string,
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foreach_" encap_stack "_encap_error
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#undef _
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};
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typedef enum {
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#define _(sym,str) " ENCAP_STACK "_ENCAP_ERROR_##sym,
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foreach_" encap_stack "_encap_error
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#undef _
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" ENCAP_STACK "_ENCAP_N_ERROR,
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} " encap_stack "_encap_error_t;
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typedef enum {
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" ENCAP_STACK "_ENCAP_NEXT_IP4_LOOKUP,
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" ENCAP_STACK "_ENCAP_NEXT_DROP,
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" ENCAP_STACK "_ENCAP_N_NEXT,
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} " encap_stack "_encap_next_t;
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typedef struct {
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u32 tunnel_index;
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} " encap_stack "_encap_trace_t;
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u8 * format_" encap_stack "_encap_trace (u8 * s, va_list * args)
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{
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CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
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CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
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" encap_stack "_encap_trace_t * t
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= va_arg (*args, " encap_stack "_encap_trace_t *);
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s = format (s, \"" ENCAP-STACK ": tunnel %d\", t->tunnel_index);
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return s;
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}
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/* $$$$ FIXME adjust to match the rewrite string */
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#define foreach_fixed_header_offset \\
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_(0) _(1) _(2) _(3) _(FIXME)
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static uword
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" encap_stack "_encap (vlib_main_t * vm,
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vlib_node_runtime_t * node,
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vlib_frame_t * from_frame)
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{
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u32 n_left_from, next_index, * from, * to_next;
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" encap_stack "_main_t * ngm = &" encap_stack "_main;
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vnet_main_t * vnm = ngm->vnet_main;
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u32 pkts_encapsulated = 0;
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u16 old_l0 = 0, old_l1 = 0;
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from = vlib_frame_vector_args (from_frame);
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n_left_from = from_frame->n_vectors;
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next_index = node->cached_next_index;
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while (n_left_from > 0)
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{
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u32 n_left_to_next;
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vlib_get_next_frame (vm, node, next_index,
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to_next, n_left_to_next);
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#if 0 /* $$$ dual loop when the single loop works */
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while (n_left_from >= 4 && n_left_to_next >= 2)
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{
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u32 bi0, bi1;
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vlib_buffer_t * b0, * b1;
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nsh_unicast_header_t * h0, * h1;
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u32 label0, label1;
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u32 next0, next1;
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uword * p0, * p1;
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/* Prefetch next iteration. */
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{
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vlib_buffer_t * p2, * p3;
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p2 = vlib_get_buffer (vm, from[2]);
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p3 = vlib_get_buffer (vm, from[3]);
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vlib_prefetch_buffer_header (p2, LOAD);
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vlib_prefetch_buffer_header (p3, LOAD);
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CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
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CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
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}
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bi0 = from[0];
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bi1 = from[1];
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to_next[0] = bi0;
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to_next[1] = bi1;
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from += 2;
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to_next += 2;
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n_left_to_next -= 2;
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n_left_from -= 2;
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b0 = vlib_get_buffer (vm, bi0);
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b1 = vlib_get_buffer (vm, bi1);
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h0 = vlib_buffer_get_current (b0);
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h1 = vlib_buffer_get_current (b1);
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next0 = next1 = " ENCAP_STACK "_ENCAP_NEXT_IP4_LOOKUP;
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vlib_buffer_advance (b0, sizeof (*h0));
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vlib_buffer_advance (b1, sizeof (*h1));
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vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
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to_next, n_left_to_next,
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bi0, bi1, next0, next1);
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}
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#endif
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while (n_left_from > 0 && n_left_to_next > 0)
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{
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u32 bi0;
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vlib_buffer_t * b0;
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u32 next0 = " ENCAP_STACK "_ENCAP_NEXT_IP4_LOOKUP;
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vnet_hw_interface_t * hi0;
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ip4_header_t * ip0;
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udp_header_t * udp0;
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u64 * copy_src0, * copy_dst0;
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u32 * copy_src_last0, * copy_dst_last0;
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" encap_stack "_tunnel_t * t0;
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u16 new_l0;
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ip_csum_t sum0;
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bi0 = from[0];
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to_next[0] = bi0;
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from += 1;
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to_next += 1;
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n_left_from -= 1;
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n_left_to_next -= 1;
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b0 = vlib_get_buffer (vm, bi0);
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/* 1-wide cache? */
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hi0 = vnet_get_sup_hw_interface
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(vnm, vnet_buffer(b0)->sw_if_index[VLIB_TX]);
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t0 = pool_elt_at_index (ngm->tunnels, hi0->dev_instance);
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ASSERT(vec_len(t0->rewrite) >= 24);
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/* Apply the rewrite string. $$$$ vnet_rewrite? */
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vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
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ip0 = vlib_buffer_get_current(b0);
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/* Copy the fixed header */
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copy_dst0 = (u64 *) ip0;
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copy_src0 = (u64 *) t0->rewrite;
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ASSERT (sizeof (ip4_udp_" encap_stack "_header_t) == FIXME);
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/* Copy first N octets 8-bytes at a time */
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#define _(offs) copy_dst0[offs] = copy_src0[offs];
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foreach_fixed_header_offset;
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#undef _
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#if 0 /* needed if encap not a multiple of 8 bytes */
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/* Last 4 octets. Hopefully gcc will be our friend */
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copy_dst_last0 = (u32 *)(©_dst0[FIXME]);
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copy_src_last0 = (u32 *)(©_src0[FIXME]);
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copy_dst_last0[0] = copy_src_last0[0];
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#endif
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/* fix the <bleep>ing outer-IP checksum */
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sum0 = ip0->checksum;
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/* old_l0 always 0, see the rewrite setup */
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new_l0 =
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clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
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sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
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length /* changed member */);
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ip0->checksum = ip_csum_fold (sum0);
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ip0->length = new_l0;
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/* Fix UDP length */
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udp0 = (udp_header_t *)(ip0+1);
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new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
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- sizeof (*ip0));
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udp0->length = new_l0;
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/* Reset to look up tunnel partner in the configured FIB */
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vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
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pkts_encapsulated ++;
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if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
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{
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" encap_stack "_encap_trace_t *tr =
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vlib_add_trace (vm, node, b0, sizeof (*tr));
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tr->tunnel_index = t0 - ngm->tunnels;
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}
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vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
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to_next, n_left_to_next,
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bi0, next0);
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}
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vlib_put_next_frame (vm, node, next_index, n_left_to_next);
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}
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vlib_node_increment_counter (vm, node->node_index,
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" ENCAP_STACK "_ENCAP_ERROR_ENCAPSULATED,
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pkts_encapsulated);
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return from_frame->n_vectors;
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}
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VLIB_REGISTER_NODE (" encap_stack "_encap_node) = {
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.function = " encap_stack "_encap,
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.name = \"" encap-stack "-encap\",
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.vector_size = sizeof (u32),
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.format_trace = format_" encap_stack "_encap_trace,
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.type = VLIB_NODE_TYPE_INTERNAL,
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.n_errors = ARRAY_LEN(" encap_stack "_encap_error_strings),
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.error_strings = " encap_stack "_encap_error_strings,
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.n_next_nodes = " ENCAP_STACK "_ENCAP_N_NEXT,
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.next_nodes = {
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[" ENCAP_STACK "_ENCAP_NEXT_IP4_LOOKUP] = \"ip4-lookup\",
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[" ENCAP_STACK "_ENCAP_NEXT_DROP] = \"error-drop\",
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},
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};
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")
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