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;;; 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\",
},
};
")
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