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 {
  37 #define _(sym,str) IPSEC_IF_OUTPUT_ERROR_##sym,
  38   foreach_ipsec_if_output_error
  39 #undef _
  40     IPSEC_IF_OUTPUT_N_ERROR,
  41 } ipsec_if_output_error_t;
  42
  43 typedef enum
  44 {
  45   IPSEC_IF_OUTPUT_NEXT_ESP_ENCRYPT,
  46   IPSEC_IF_OUTPUT_NEXT_DROP,
  47   IPSEC_IF_OUTPUT_N_NEXT,
  48 } ipsec_if_output_next_t;
  49
  50 typedef struct
  51 {
  52   u32 spi;
  53   u32 seq;
  54 } ipsec_if_output_trace_t;
  55
  56
  57 u8 *
  58 format_ipsec_if_output_trace (u8 * s, va_list * args)
  59 {
  60   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  61   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  62   ipsec_if_output_trace_t *t = va_arg (*args, ipsec_if_output_trace_t *);
  63
  64   s = format (s, "IPSec: spi %u seq %u", t->spi, t->seq);
  65   return s;
  66 }
  67
  68 static uword
  69 ipsec_if_output_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
  70                          vlib_frame_t * from_frame)
  71 {
  72   ipsec_main_t *im = &ipsec_main;
  73   vnet_main_t *vnm = im->vnet_main;
  74   u32 *from, *to_next = 0, next_index;
  75   u32 n_left_from, sw_if_index0;
  76
  77   from = vlib_frame_vector_args (from_frame);
  78   n_left_from = from_frame->n_vectors;
  79   next_index = node->cached_next_index;
  80
  81   while (n_left_from > 0)
  82     {
  83       u32 n_left_to_next;
  84
  85       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
  86
  87       while (n_left_from > 0 && n_left_to_next > 0)
  88         {
  89           u32 bi0, next0;
  90           vlib_buffer_t *b0;
  91           ipsec_tunnel_if_t *t0;
  92           vnet_hw_interface_t *hi0;
  93
  94           bi0 = to_next[0] = from[0];
  95           from += 1;
  96           n_left_from -= 1;
  97           to_next += 1;
  98           n_left_to_next -= 1;
  99           b0 = vlib_get_buffer (vm, bi0);
 100           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
 101           hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
 102           t0 = pool_elt_at_index (im->tunnel_interfaces, hi0->dev_instance);
 103           vnet_buffer (b0)->output_features.ipsec_sad_index =
 104             t0->output_sa_index;
 105           next0 = IPSEC_IF_OUTPUT_NEXT_ESP_ENCRYPT;
 106
 107           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 108             {
 109               ipsec_if_output_trace_t *tr =
 110                 vlib_add_trace (vm, node, b0, sizeof (*tr));
 111               ipsec_sa_t *sa0 =
 112                 pool_elt_at_index (im->sad, t0->output_sa_index);
 113               tr->spi = sa0->spi;
 114               tr->seq = sa0->seq;
 115             }
 116
 117           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 118                                            n_left_to_next, bi0, next0);
 119         }
 120       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 121     }
 122
 123   vlib_node_increment_counter (vm, ipsec_if_output_node.index,
 124                                IPSEC_IF_OUTPUT_ERROR_TX,
 125                                from_frame->n_vectors);
 126
 127   return from_frame->n_vectors;
 128 }
 129
 130 /* *INDENT-OFF* */
 131 VLIB_REGISTER_NODE (ipsec_if_output_node) = {
 132   .function = ipsec_if_output_node_fn,
 133   .name = "ipsec-if-output",
 134   .vector_size = sizeof (u32),
 135   .format_trace = format_ipsec_if_output_trace,
 136   .type = VLIB_NODE_TYPE_INTERNAL,
 137
 138   .n_errors = ARRAY_LEN(ipsec_if_output_error_strings),
 139   .error_strings = ipsec_if_output_error_strings,
 140
 141   .n_next_nodes = IPSEC_IF_OUTPUT_N_NEXT,
 142
 143   .next_nodes = {
 144         [IPSEC_IF_OUTPUT_NEXT_ESP_ENCRYPT] = "esp-encrypt",
 145         [IPSEC_IF_OUTPUT_NEXT_DROP] = "error-drop",
 146   },
 147 };
 148 /* *INDENT-ON* */
 149
 150 VLIB_NODE_FUNCTION_MULTIARCH (ipsec_if_output_node, ipsec_if_output_node_fn)
 151 /*
 152  * fd.io coding-style-patch-verification: ON
 153  *
 154  * Local Variables:
 155  * eval: (c-set-style "gnu")
 156  * End:
 157  */