path: root/src/vnet/l2/l2_vtr.h

/*
 * l2_vtr.h : layer 2 vlan tag rewrite processing
 *
 * Copyright (c) 2013 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.
 */

#ifndef included_vnet_l2_vtr_h
#define included_vnet_l2_vtr_h

#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/ethernet/packet.h>
#include <vnet/l2/l2_vtr.h>

/* VTR config options for API and CLI support */
typedef enum
{
  L2_VTR_DISABLED,
  L2_VTR_PUSH_1,
  L2_VTR_PUSH_2,
  L2_VTR_POP_1,
  L2_VTR_POP_2,
  L2_VTR_TRANSLATE_1_1,
  L2_VTR_TRANSLATE_1_2,
  L2_VTR_TRANSLATE_2_1,
  L2_VTR_TRANSLATE_2_2
} l2_vtr_op_t;

/**
 * Per-interface vlan tag rewrite configuration
 * There will be one instance of this struct for each sw_if_index
 * for both input vtr and output vtr
 */
typedef struct
{
  union
  {
    /*
     * Up to two vlan tags to push.
     * if there is only one vlan tag to push, it is in tags[1].
     */
    ethernet_vlan_header_tv_t tags[2];
    u64 raw_tags;
  };

  union
  {
    struct
    {
      u8 push_bytes;		/* number of bytes to push for up to 2 vlans (0,4,8) */
      u8 pop_bytes;		/* number of bytes to pop for up to 2 vlans (0,4,8) */
    };
    u16 push_and_pop_bytes;	/* if 0 then the feature is disabled */
  };
} vtr_config_t;


/**
 * Perform the configured tag rewrite on the packet.
 * Return 0 if ok, 1 if packet should be dropped (e.g. tried to pop
 * too many tags)
 */
always_inline u32
l2_vtr_process (vlib_buffer_t * b0, vtr_config_t * config)
{
  u64 temp_8;
  u32 temp_4;
  u8 *eth;

  eth = vlib_buffer_get_current (b0);

  /* copy the 12B dmac and smac to a temporary location */
  temp_8 = *((u64 *) eth);
  temp_4 = *((u32 *) (eth + 8));

  /* adjust for popped tags */
  eth += config->pop_bytes;

  /* if not enough tags to pop then drop packet */
  if (PREDICT_FALSE ((vnet_buffer (b0)->l2.l2_len - 12) < config->pop_bytes))
    {
      return 1;
    }

  /* copy the 2 new tags to the start of the packet  */
  *((u64 *) (eth + 12 - 8)) = config->raw_tags;

  /* TODO: set cos bits */

  /* adjust for pushed tags: */
  eth -= 
/*
 * Copyright (c) 2015 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/vxlan/vxlan.h>
#include <vnet/ip/format.h>

/**
 * @file
 * @brief VXLAN.
 *
 * VXLAN provides the features needed to allow L2 bridge domains (BDs)
 * to span multiple servers. This is done by building an L2 overlay on
 * top of an L3 network underlay using VXLAN tunnels.
 *
 * This makes it possible for servers to be co-located in the same data
 * center or be separated geographically as long as they are reachable
 * through the underlay L3 network.
 *
 * You can refer to this kind of L2 overlay bridge domain as a VXLAN
 * (Virtual eXtensible VLAN) segment.
 */


vxlan_main_t vxlan_main;

static u8 * format_decap_next (u8 * s, va_list * args)
{
  u32 next_index = va_arg (*args, u32);

  switch (next_index)
    {
    case VXLAN_INPUT_NEXT_DROP:
      return format (s, "drop");
    case VXLAN_INPUT_NEXT_L2_INPUT:
      return format (s, "l2");
    case VXLAN_INPUT_NEXT_IP4_INPUT:
      return format (s, "ip4");
    case VXLAN_INPUT_NEXT_IP6_INPUT:
      return format (s, "ip6");
    default:
      return format (s, "unknown %d", next_index);
    }
  return s;
}

u8 * format_vxlan_tunnel (u8 * s, va_list * args)
{
  vxlan_tunnel_t * t = va_arg (*args, vxlan_tunnel_t *);
  vxlan_main_t * ngm = &vxlan_main;

  s = format (s, 
              "[%d] %U (src) %U (dst) vni %d encap_fib_index %d",
              t - ngm->tunnels,
              format_ip46_address, &t->src, IP46_TYPE_ANY,
              format_ip46_address, &t->dst, IP46_TYPE_ANY,
              t->vni,
              t->encap_fib_index);
  s = format (s, " decap_next %U\n", format_decap_next, t->decap_next_index);
  return s;
}

static u8 * format_vxlan_name (u8 * s, va_list * args)
{
  u32 dev_instance = va_arg (*args, u32);
  return format (s, "vxlan_tunnel%d", dev_instance);
}

static uword dummy_interface_tx (vlib_main_t * vm,
                                 vlib_node_runtime_t * node,
                                 vlib_frame_t * frame)
{
  clib_warning ("you shouldn't be here, leaking buffers...");
  return frame->n_vectors;
}

static clib_error_t *
vxlan_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
{
  if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
    vnet_hw_interface_set_flags (vnm, hw_if_index, VNET_HW_INTERFACE_FLAG_LINK_UP);
  else
    vnet_hw_interface_set_flags (vnm, hw_if_index, 0);

  return /* no error */ 0;
}

VNET_DEVICE_CLASS (vxlan_device_class,static) = {
  .name = "VXLAN",
  .format_device_name = format_vxlan_name,
  .format_tx_trace = format_vxlan_encap_trace,
  .tx_function = dummy_interface_tx,
  .admin_up_down_function = vxlan_interface_admin_up_down,
};

static u8 * format_vxlan_header_with_length (u8 * s, va_list * args)
{
  u32 dev_instance = va_arg (*args, u32);
  s = format (s, "unimplemented dev %u", dev_instance);
  return s;
}

VNET_HW_INTERFACE_CLASS (vxlan_hw_class) = {
  .name = "VXLAN",
  .format_header = format_vxlan_header_with_length,
  .build_rewrite = default_build_rewrite,
};

#define foreach_copy_field                      \
_(vni)                                          \
_(encap_fib_index)                              \
_(decap_next_index)

#define foreach_copy_ipv4 {                     \
  _(src.ip4.as_u32)                             \
  _(dst.ip4.as_u32)                             \
}

#define foreach_copy_ipv6 {                     \
  _(src.ip6.as_u64[0])                          \
  _(src.ip6.as_u64[1])                          \
  _(dst.ip6.as_u64[0])                          \
  _(dst.ip6.as_u64[1])                          \
}

static int vxlan4_rewrite (vxlan_tunnel_t * t)
{
  u8 *rw = 0;
  ip4_header_t * ip0;
  ip4_vxlan_header_t * h0;
  int len = sizeof (*h0);

  vec_validate_aligned (rw, len-