src/vnet/ipsec/ipsec_if_in.c

   1 /*
   2  * ipsec_if_in.c : IPSec interface input 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 #include <vnet/ipsec/esp.h>
  24
  25 #if DPDK_CRYPTO==1
  26 #define ESP_NODE "dpdk-esp-decrypt"
  27 #else
  28 #define ESP_NODE "esp-decrypt"
  29 #endif
  30
  31 /* Statistics (not really errors) */
  32 #define foreach_ipsec_if_input_error    \
  33 _(RX, "good packets received")
  34
  35 static char *ipsec_if_input_error_strings[] = {
  36 #define _(sym,string) string,
  37   foreach_ipsec_if_input_error
  38 #undef _
  39 };
  40
  41 typedef enum
  42 {
  43 #define _(sym,str) IPSEC_IF_INPUT_ERROR_##sym,
  44   foreach_ipsec_if_input_error
  45 #undef _
  46     IPSEC_IF_INPUT_N_ERROR,
  47 } ipsec_if_input_error_t;
  48
  49 typedef enum
  50 {
  51   IPSEC_IF_INPUT_NEXT_ESP_DECRYPT,
  52   IPSEC_IF_INPUT_NEXT_DROP,
  53   IPSEC_IF_INPUT_N_NEXT,
  54 } ipsec_if_input_next_t;
  55
  56 typedef struct
  57 {
  58   u32 spi;
  59   u32 seq;
  60 } ipsec_if_input_trace_t;
  61
  62
  63 u8 *
  64 format_ipsec_if_input_trace (u8 * s, va_list * args)
  65 {
  66   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  67   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  68   ipsec_if_input_trace_t *t = va_arg (*args, ipsec_if_input_trace_t *);
  69
  70   s = format (s, "IPSec: spi %u seq %u", t->spi, t->seq);
  71   return s;
  72 }
  73
  74 static uword
  75 ipsec_if_input_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
  76                         vlib_frame_t * from_frame)
  77 {
  78   ipsec_main_t *im = &ipsec_main;
  79   u32 *from, *to_next = 0, next_index;
  80   u32 n_left_from;
  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           ip4_header_t *ip0;
  97           esp_header_t *esp0;
  98           uword *p;
  99
 100           bi0 = to_next[0] = from[0];
 101           from += 1;
 102           n_left_from -= 1;
 103           to_next += 1;
 104           n_left_to_next -= 1;
 105           b0 = vlib_get_buffer (vm, bi0);
 106           ip0 = vlib_buffer_get_current (b0);
 107           esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
 108
 109           next0 = IPSEC_IF_INPUT_NEXT_DROP;
 110
 111           u64 key = (u64) ip0->src_address.as_u32 << 32 |
 112             (u64) clib_net_to_host_u32 (esp0->spi);
 113
 114           p = hash_get (im->ipsec_if_pool_index_by_key, key);
 115
 116           if (p)
 117             {
 118               ipsec_tunnel_if_t *t;
 119               t = pool_elt_at_index (im->tunnel_interfaces, p[0]);
 120               vnet_buffer (b0)->ipsec.sad_index = t->input_sa_index;
 121               vnet_buffer (b0)->ipsec.flags =
 122                 t->hw_if_index == ~0 ? IPSEC_FLAG_IPSEC_GRE_TUNNEL : 0;
 123               vlib_buffer_advance (b0, ip4_header_bytes (ip0));
 124               next0 = IPSEC_IF_INPUT_NEXT_ESP_DECRYPT;
 125             }
 126
 127           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 128             {
 129               ipsec_if_input_trace_t *tr =
 130                 vlib_add_trace (vm, node, b0, sizeof (*tr));
 131               tr->spi = clib_host_to_net_u32 (esp0->spi);
 132               tr->seq = clib_host_to_net_u32 (esp0->seq);
 133             }
 134
 135           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 136                                            n_left_to_next, bi0, next0);
 137         }
 138       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 139     }
 140
 141   vlib_node_increment_counter (vm, ipsec_if_input_node.index,
 142                                IPSEC_IF_INPUT_ERROR_RX,
 143                                from_frame->n_vectors);
 144
 145   return from_frame->n_vectors;
 146 }
 147
 148 /* *INDENT-OFF* */
 149 VLIB_REGISTER_NODE (ipsec_if_input_node) = {
 150   .function = ipsec_if_input_node_fn,
 151   .name = "ipsec-if-input",
 152   .vector_size = sizeof (u32),
 153   .format_trace = format_ipsec_if_input_trace,
 154   .type = VLIB_NODE_TYPE_INTERNAL,
 155
 156   .n_errors = ARRAY_LEN(ipsec_if_input_error_strings),
 157   .error_strings = ipsec_if_input_error_strings,
 158
 159   .n_next_nodes = IPSEC_IF_INPUT_N_NEXT,
 160
 161   .next_nodes = {
 162         [IPSEC_IF_INPUT_NEXT_ESP_DECRYPT] = ESP_NODE,
 163         [IPSEC_IF_INPUT_NEXT_DROP] = "error-drop",
 164   },
 165 };
 166 /* *INDENT-ON* */
 167
 168 VLIB_NODE_FUNCTION_MULTIARCH (ipsec_if_input_node, ipsec_if_input_node_fn)
 169 /*
 170  * fd.io coding-style-patch-verification: ON
 171  *
 172  * Local Variables:
 173  * eval: (c-set-style "gnu")
 174  * End:
 175  */