vnet/vnet/ipsec/ipsec_if_out.c

   1 /*
   2  * ipsec_if_out.c : IPSec interface output node
   3  *
   4  * Copyright (c) 2015 Cisco and/or its affiliates.
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at:
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include <vnet/vnet.h>
  19 #include <vnet/api_errno.h>
  20 #include <vnet/ip/ip.h>
  21
  22 #include <vnet/ipsec/ipsec.h>
  23
  24
  25 /* Statistics (not really errors) */
  26 #define foreach_ipsec_if_output_error    \
  27 _(TX, "good packets transmitted")
  28
  29 static char * ipsec_if_output_error_strings[] = {
  30 #define _(sym,string) string,
  31   foreach_ipsec_if_output_error
  32 #undef _
  33 };
  34
  35 typedef enum {
  36 #define _(sym,str) IPSEC_IF_OUTPUT_ERROR_##sym,
  37     foreach_ipsec_if_output_error
  38 #undef _
  39     IPSEC_IF_OUTPUT_N_ERROR,
  40 } ipsec_if_output_error_t;
  41
  42 typedef enum {
  43     IPSEC_IF_OUTPUT_NEXT_ESP_ENCRYPT,
  44     IPSEC_IF_OUTPUT_NEXT_DROP,
  45     IPSEC_IF_OUTPUT_N_NEXT,
  46 } ipsec_if_output_next_t;
  47
  48 typedef struct {
  49   u32 spi;
  50   u32 seq;
  51 } ipsec_if_output_trace_t;
  52
  53
  54 u8 * format_ipsec_if_output_trace (u8 * s, va_list * args)
  55 {
  56   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  57   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  58   ipsec_if_output_trace_t * t
  59       = va_arg (*args, ipsec_if_output_trace_t *);
  60
  61   s = format (s, "IPSec: spi %u seq %u", t->spi, t->seq);
  62   return s;
  63 }
  64
  65 static uword
  66 ipsec_if_output_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
  67                          vlib_frame_t * from_frame)
  68 {
  69   ipsec_main_t *im = &ipsec_main;
  70   vnet_main_t * vnm = im->vnet_main;
  71   u32 * from, * to_next = 0, next_index;
  72   u32 n_left_from, sw_if_index0;
  73
  74   from = vlib_frame_vector_args (from_frame);
  75   n_left_from = from_frame->n_vectors;
  76   next_index = node->cached_next_index;
  77
  78   while (n_left_from > 0)
  79     {
  80       u32 n_left_to_next;
  81
  82       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
  83
  84       while (n_left_from > 0 && n_left_to_next > 0)
  85         {
  86           u32 bi0, next0;
  87           vlib_buffer_t * b0;
  88           ipsec_tunnel_if_t * t0;
  89           vnet_hw_interface_t * hi0;
  90
  91           bi0 = to_next[0] = from[0];
  92           from += 1;
  93           n_left_from -= 1;
  94           to_next +=1;
  95           n_left_to_next -= 1;
  96           b0 = vlib_get_buffer (vm, bi0);
  97           sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
  98           hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
  99           t0 = pool_elt_at_index (im->tunnel_interfaces, hi0->dev_instance);
 100           vnet_buffer(b0)->output_features.ipsec_sad_index = t0->output_sa_index;
 101           next0 = IPSEC_IF_OUTPUT_NEXT_ESP_ENCRYPT;
 102
 103           if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) {
 104             ipsec_if_output_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
 105             ipsec_sa_t * sa0 = pool_elt_at_index(im->sad, t0->output_sa_index);
 106             tr->spi = sa0->spi;
 107             tr->seq = sa0->seq;
 108           }
 109
 110           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 111                                            n_left_to_next, bi0, next0);
 112         }
 113       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 114     }
 115
 116   vlib_node_increment_counter (vm, ipsec_if_output_node.index,
 117                                IPSEC_IF_OUTPUT_ERROR_TX,
 118                                from_frame->n_vectors);
 119
 120   return from_frame->n_vectors;
 121 }
 122
 123 VLIB_REGISTER_NODE (ipsec_if_output_node) = {
 124   .function = ipsec_if_output_node_fn,
 125   .name = "ipsec-if-output",
 126   .vector_size = sizeof (u32),
 127   .format_trace = format_ipsec_if_output_trace,
 128   .type = VLIB_NODE_TYPE_INTERNAL,
 129
 130   .n_errors = ARRAY_LEN(ipsec_if_output_error_strings),
 131   .error_strings = ipsec_if_output_error_strings,
 132
 133   .n_next_nodes = IPSEC_IF_OUTPUT_N_NEXT,
 134
 135   .next_nodes = {
 136         [IPSEC_IF_OUTPUT_NEXT_ESP_ENCRYPT] = "esp-encrypt",
 137         [IPSEC_IF_OUTPUT_NEXT_DROP] = "error-drop",
 138   },
 139 };
 140
 141 VLIB_NODE_FUNCTION_MULTIARCH (ipsec_if_output_node, ipsec_if_output_node_fn)
 142