src/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 /* Statistics (not really errors) */
  25 #define foreach_ipsec_if_output_error    \
  26 _(TX, "good packets transmitted")
  27
  28 static char *ipsec_if_output_error_strings[] = {
  29 #define _(sym,string) string,
  30   foreach_ipsec_if_output_error
  31 #undef _
  32 };
  33
  34 typedef enum
  35 {
  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
  43 typedef struct
  44 {
  45   u32 spi;
  46   u32 seq;
  47 } ipsec_if_output_trace_t;
  48
  49 u8 *
  50 format_ipsec_if_output_trace (u8 * s, va_list * args)
  51 {
  52   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  53   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  54   ipsec_if_output_trace_t *t = va_arg (*args, ipsec_if_output_trace_t *);
  55
  56   s = format (s, "IPSec: spi %u seq %u", t->spi, t->seq);
  57   return s;
  58 }
  59
  60 static uword
  61 ipsec_if_output_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
  62                          vlib_frame_t * from_frame)
  63 {
  64   ipsec_main_t *im = &ipsec_main;
  65   vnet_main_t *vnm = im->vnet_main;
  66   vnet_interface_main_t *vim = &vnm->interface_main;
  67   u32 *from, *to_next = 0, next_index;
  68   u32 n_left_from, sw_if_index0, last_sw_if_index = ~0;
  69   u32 thread_index = vlib_get_thread_index ();
  70   u32 n_bytes = 0, n_packets = 0;
  71
  72   from = vlib_frame_vector_args (from_frame);
  73   n_left_from = from_frame->n_vectors;
  74   next_index = node->cached_next_index;
  75
  76   while (n_left_from > 0)
  77     {
  78       u32 n_left_to_next;
  79
  80       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
  81
  82       while (n_left_from > 0 && n_left_to_next > 0)
  83         {
  84           u32 bi0, next0, len0;
  85           vlib_buffer_t *b0;
  86           ipsec_tunnel_if_t *t0;
  87           vnet_hw_interface_t *hi0;
  88
  89           bi0 = to_next[0] = from[0];
  90           from += 1;
  91           n_left_from -= 1;
  92           to_next += 1;
  93           n_left_to_next -= 1;
  94           b0 = vlib_get_buffer (vm, bi0);
  95           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
  96           hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
  97           t0 = pool_elt_at_index (im->tunnel_interfaces, hi0->dev_instance);
  98           vnet_buffer (b0)->ipsec.sad_index = t0->output_sa_index;
  99           next0 = im->esp_encrypt_next_index;
 100
 101           len0 = vlib_buffer_length_in_chain (vm, b0);
 102
 103           if (PREDICT_TRUE (sw_if_index0 == last_sw_if_index))
 104             {
 105               n_packets++;
 106               n_bytes += len0;
 107             }
 108           else
 109             {
 110               vlib_increment_combined_counter (vim->combined_sw_if_counters +
 111                                                VNET_INTERFACE_COUNTER_TX,
 112                                                thread_index, sw_if_index0,
 113                                                n_packets, n_bytes);
 114               last_sw_if_index = sw_if_index0;
 115               n_packets = 1;
 116               n_bytes = len0;
 117             }
 118
 119           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 120             {
 121               ipsec_if_output_trace_t *tr =
 122                 vlib_add_trace (vm, node, b0, sizeof (*tr));
 123               ipsec_sa_t *sa0 =
 124                 pool_elt_at_index (im->sad, t0->output_sa_index);
 125               tr->spi = sa0->spi;
 126               tr->seq = sa0->seq;
 127             }
 128
 129           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 130                                            n_left_to_next, bi0, next0);
 131         }
 132       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 133     }
 134
 135   if (last_sw_if_index != ~0)
 136     {
 137       vlib_increment_combined_counter (vim->combined_sw_if_counters +
 138                                        VNET_INTERFACE_COUNTER_TX,
 139                                        thread_index,
 140                                        last_sw_if_index, n_packets, n_bytes);
 141     }
 142
 143   vlib_node_increment_counter (vm, ipsec_if_output_node.index,
 144                                IPSEC_IF_OUTPUT_ERROR_TX,
 145                                from_frame->n_vectors);
 146
 147   return from_frame->n_vectors;
 148 }
 149
 150 /* *INDENT-OFF* */
 151 VLIB_REGISTER_NODE (ipsec_if_output_node) = {
 152   .function = ipsec_if_output_node_fn,
 153   .name = "ipsec-if-output",
 154   .vector_size = sizeof (u32),
 155   .format_trace = format_ipsec_if_output_trace,
 156   .type = VLIB_NODE_TYPE_INTERNAL,
 157
 158   .n_errors = ARRAY_LEN(ipsec_if_output_error_strings),
 159   .error_strings = ipsec_if_output_error_strings,
 160
 161   .sibling_of = "ipsec-output-ip4",
 162 };
 163 /* *INDENT-ON* */
 164
 165 VLIB_NODE_FUNCTION_MULTIARCH (ipsec_if_output_node, ipsec_if_output_node_fn)
 166 /*
 167  * fd.io coding-style-patch-verification: ON
 168  *
 169  * Local Variables:
 170  * eval: (c-set-style "gnu")
 171  * End:
 172  */