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 #if DPDK_CRYPTO==1
  25 #define ESP_NODE "dpdk-esp-encrypt"
  26 #else
  27 #define ESP_NODE "esp-encrypt"
  28 #endif
  29
  30 /* Statistics (not really errors) */
  31 #define foreach_ipsec_if_output_error    \
  32 _(TX, "good packets transmitted")
  33
  34 static char *ipsec_if_output_error_strings[] = {
  35 #define _(sym,string) string,
  36   foreach_ipsec_if_output_error
  37 #undef _
  38 };
  39
  40 typedef enum
  41 {
  42 #define _(sym,str) IPSEC_IF_OUTPUT_ERROR_##sym,
  43   foreach_ipsec_if_output_error
  44 #undef _
  45     IPSEC_IF_OUTPUT_N_ERROR,
  46 } ipsec_if_output_error_t;
  47
  48 typedef enum
  49 {
  50   IPSEC_IF_OUTPUT_NEXT_ESP_ENCRYPT,
  51   IPSEC_IF_OUTPUT_NEXT_DROP,
  52   IPSEC_IF_OUTPUT_N_NEXT,
  53 } ipsec_if_output_next_t;
  54
  55 typedef struct
  56 {
  57   u32 spi;
  58   u32 seq;
  59 } ipsec_if_output_trace_t;
  60
  61
  62 u8 *
  63 format_ipsec_if_output_trace (u8 * s, va_list * args)
  64 {
  65   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  66   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  67   ipsec_if_output_trace_t *t = va_arg (*args, ipsec_if_output_trace_t *);
  68
  69   s = format (s, "IPSec: spi %u seq %u", t->spi, t->seq);
  70   return s;
  71 }
  72
  73 static uword
  74 ipsec_if_output_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
  75                          vlib_frame_t * from_frame)
  76 {
  77   ipsec_main_t *im = &ipsec_main;
  78   vnet_main_t *vnm = im->vnet_main;
  79   u32 *from, *to_next = 0, next_index;
  80   u32 n_left_from, sw_if_index0;
  81
  82   from = vlib_frame_vector_args (from_frame);
  83   n_left_from = from_frame->n_vectors;
  84   next_index = node->cached_next_index;
  85
  86   while (n_left_from > 0)
  87     {
  88       u32 n_left_to_next;
  89
  90       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
  91
  92       while (n_left_from > 0 && n_left_to_next > 0)
  93         {
  94           u32 bi0, next0;
  95           vlib_buffer_t *b0;
  96           ipsec_tunnel_if_t *t0;
  97           vnet_hw_interface_t *hi0;
  98
  99           bi0 = to_next[0] = from[0];
 100           from += 1;
 101           n_left_from -= 1;
 102           to_next += 1;
 103           n_left_to_next -= 1;
 104           b0 = vlib_get_buffer (vm, bi0);
 105           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
 106           hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
 107           t0 = pool_elt_at_index (im->tunnel_interfaces, hi0->dev_instance);
 108           vnet_buffer (b0)->ipsec.sad_index = t0->output_sa_index;
 109           next0 = IPSEC_IF_OUTPUT_NEXT_ESP_ENCRYPT;
 110
 111           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 112             {
 113               ipsec_if_output_trace_t *tr =
 114                 vlib_add_trace (vm, node, b0, sizeof (*tr));
 115               ipsec_sa_t *sa0 =
 116                 pool_elt_at_index (im->sad, t0->output_sa_index);
 117               tr->spi = sa0->spi;
 118               tr->seq = sa0->seq;
 119             }
 120
 121           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 122                                            n_left_to_next, bi0, next0);
 123         }
 124       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 125     }
 126
 127   vlib_node_increment_counter (vm, ipsec_if_output_node.index,
 128                                IPSEC_IF_OUTPUT_ERROR_TX,
 129                                from_frame->n_vectors);
 130
 131   return from_frame->n_vectors;
 132 }
 133
 134 /* *INDENT-OFF* */
 135 VLIB_REGISTER_NODE (ipsec_if_output_node) = {
 136   .function = ipsec_if_output_node_fn,
 137   .name = "ipsec-if-output",
 138   .vector_size = sizeof (u32),
 139   .format_trace = format_ipsec_if_output_trace,
 140   .type = VLIB_NODE_TYPE_INTERNAL,
 141
 142   .n_errors = ARRAY_LEN(ipsec_if_output_error_strings),
 143   .error_strings = ipsec_if_output_error_strings,
 144
 145   .n_next_nodes = IPSEC_IF_OUTPUT_N_NEXT,
 146
 147   .next_nodes = {
 148         [IPSEC_IF_OUTPUT_NEXT_ESP_ENCRYPT] = ESP_NODE,
 149         [IPSEC_IF_OUTPUT_NEXT_DROP] = "error-drop",
 150   },
 151 };
 152 /* *INDENT-ON* */
 153
 154 VLIB_NODE_FUNCTION_MULTIARCH (ipsec_if_output_node, ipsec_if_output_node_fn)
 155 /*
 156  * fd.io coding-style-patch-verification: ON
 157  *
 158  * Local Variables:
 159  * eval: (c-set-style "gnu")
 160  * End:
 161  */