udp_encap_node.c

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/*
 * Copyright (c) 2017 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <vnet/udp/udp_encap.h>

typedef struct udp4_encap_trace_t_
{
  udp_header_t udp;
  ip4_header_t ip;
} udp4_encap_trace_t;

typedef struct udp6_encap_trace_t_
{
  udp_header_t udp;
  ip6_header_t ip;
} udp6_encap_trace_t;

static u8 *
format_udp4_encap_trace (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  udp4_encap_trace_t *t;

  t = va_arg (*args, udp4_encap_trace_t *);

  s = format (s, "%U\n  %U",
              format_ip4_header, &t->ip, sizeof (t->ip),
              format_udp_header, &t->udp, sizeof (t->udp));
  return (s);
}

static u8 *
format_udp6_encap_trace (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  udp6_encap_trace_t *t;

  t = va_arg (*args, udp6_encap_trace_t *);

  s = format (s, "%U\n  %U",
              format_ip6_header, &t->ip, sizeof (t->ip),
              format_udp_header, &t->udp, sizeof (t->udp));
  return (s);
}

always_inline uword
udp_encap_inline (vlib_main_t * vm,
                  vlib_node_runtime_t * node,
                  vlib_frame_t * frame, int is_encap_v6)
{
  u32 *from = vlib_frame_vector_args (frame);
  u32 n_left_from, n_left_to_next, *to_next, next_index;

  n_left_from = frame->n_vectors;
  next_index = node->cached_next_index;

  while (n_left_from > 0)
    {
      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

      while (n_left_from >= 4 && n_left_to_next >= 2)
        {
          vlib_buffer_t *b0, *b1;
          udp_encap_t *ue0, *ue1;
          u32 bi0, next0, uei0;
          u32 bi1, next1, uei1;

          /* Prefetch next iteration. */
          {
            vlib_buffer_t *p2, *p3;

            p2 = vlib_get_buffer (vm, from[2]);
            p3 = vlib_get_buffer (vm, from[3]);

            vlib_prefetch_buffer_header (p2, STORE);
            vlib_prefetch_buffer_header (p3, STORE);
          }

          bi0 = to_next[0] = from[0];
          bi1 = to_next[1] = from[1];

          from += 2;
          n_left_from -= 2;
          to_next += 2;
          n_left_to_next -= 2;

          b0 = vlib_get_buffer (vm, bi0);
          b1 = vlib_get_buffer (vm, bi1);

          uei0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
          uei1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];

          /* Rewrite packet header and updates lengths. */
          ue0 = udp_encap_get (uei0);
          ue1 = udp_encap_get (uei1);

          /* Paint */
          if (is_encap_v6)
            {
              const u8 n_bytes =
                sizeof (udp_header_t) + sizeof (ip6_header_t);
              ip_udp_encap_two (vm, b0, b1, (u8 *) & ue0->ue_hdrs,
                                (u8 *) & ue1->ue_hdrs, n_bytes, 0);
              if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
                {
                  udp6_encap_trace_t *tr =
                    vlib_add_trace (vm, node, b0, sizeof (*tr));
                  tr->udp = ue0->ue_hdrs.ip6.ue_udp;
                  tr->ip = ue0->ue_hdrs.ip6.ue_ip6;
                }
              if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
                {
                  udp6_encap_trace_t *tr =
                    vlib_add_trace (vm, node, b1, sizeof (*tr));
                  tr->udp = ue1->ue_hdrs.ip6.ue_udp;
                  tr->ip = ue1->ue_hdrs.ip6.ue_ip6;
                }
            }
          else
            {
              const u8 n_bytes =
                sizeof (udp_header_t) + sizeof (ip4_header_t);

              ip_udp_encap_two (vm, b0, b1,
                                (u8 *) & ue0->ue_hdrs,
                                (u8 *) & ue1->ue_hdrs, n_bytes, 1);

              if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
                {
                  udp4_encap_trace_t *tr =
                    vlib_add_trace (vm, node, b0, sizeof (*tr));
                  tr->udp = ue0->ue_hdrs.ip4.ue_udp;
                  tr->ip = ue0->ue_hdrs.ip4.ue_ip4;
                }
              if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
                {
                  udp4_encap_trace_t *tr =
                    vlib_add_trace (vm, node, b1, sizeof (*tr));
                  tr->udp = ue1->ue_hdrs.ip4.ue_udp;
                  tr->ip = ue1->ue_hdrs.ip4.ue_ip4;
                }
            }

          next0 = ue0->ue_dpo.dpoi_next_node;
          next1 = ue1->ue_dpo.dpoi_next_node;
          vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ue0->ue_dpo.dpoi_index;
          vnet_buffer (b1)->ip.adj_index[VLIB_TX] = ue1->ue_dpo.dpoi_index;

          vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
                                           to_next, n_left_to_next,
                                           bi0, bi1, next0, next1);
        }

      while (n_left_from > 0 && n_left_to_next > 0)
        {
          u32 bi0, next0, uei0;
          vlib_buffer_t *b0;
          udp_encap_t *ue0;

          bi0 = to_next[0] = from[0];

          from += 1;
          n_left_from -= 1;
          to_next += 1;
          n_left_to_next -= 1;

          b0 = vlib_get_buffer (vm, bi0);

          uei0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];

          /* Rewrite packet header and updates lengths. */
          ue0 = udp_encap_get (uei0);

          /* Paint */
          if (is_encap_v6)
            {
              const u8 n_bytes =
                sizeof (udp_header_t) + sizeof (ip6_header_t);
              ip_udp_encap_one (vm, b0, (u8 *) & ue0->ue_hdrs.ip6, n_bytes,
                                0);

              if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
                {
                  udp6_encap_trace_t *tr =
                    vlib_add_trace (vm, node, b0, sizeof (*tr));
                  tr->udp = ue0->ue_hdrs.ip6.ue_udp;
                  tr->ip = ue0->ue_hdrs.ip6.ue_ip6;
                }
            }
          else
            {
              const u8 n_bytes =
                sizeof (udp_header_t) + sizeof (ip4_header_t);

              ip_udp_encap_one (vm, b0, (u8 *) & ue0->ue_hdrs.ip4, n_bytes,
                                1);

              if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
                {
                  udp4_encap_trace_t *tr =
                    vlib_add_trace (vm, node, b0, sizeof (*tr));
                  tr->udp = ue0->ue_hdrs.ip4.ue_udp;
                  tr->ip = ue0->ue_hdrs.ip4.ue_ip4;
                }
            }

          next0 = ue0->ue_dpo.dpoi_next_node;
          vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ue0->ue_dpo.dpoi_index;

          vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
                                           to_next, n_left_to_next,
                                           bi0, next0);
        }

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }

  return frame->n_vectors;
}

static uword
udp4_encap (vlib_main_t * vm,
            vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  return udp_encap_inline (vm, node, frame, 0);
}

static uword
udp6_encap (vlib_main_t * vm,
            vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  return udp_encap_inline (vm, node, frame, 1);
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (udp4_encap_node) = {
  .function = udp4_encap,
  .name = "udp4-encap",
  .vector_size = sizeof (u32),

  .format_trace = format_udp4_encap_trace,

  .n_next_nodes = 0,
};
VLIB_NODE_FUNCTION_MULTIARCH (udp4_encap_node, udp4_encap);

VLIB_REGISTER_NODE (udp6_encap_node) = {
  .function = udp6_encap,
  .name = "udp6-encap",
  .vector_size = sizeof (u32),

  .format_trace = format_udp6_encap_trace,

  .n_next_nodes = 0,
};
VLIB_NODE_FUNCTION_MULTIARCH (udp6_encap_node, udp6_encap);
/* *INDENT-ON* */


/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */