aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/ip/ip.api
diff options
context:
space:
mode:
authorNeale Ranns <nranns@cisco.com>2019-12-15 22:26:37 +0000
committerNeale Ranns <nranns@cisco.com>2019-12-15 22:26:37 +0000
commit77cfc0171da0fa2b305378731a5fefd659d8947d (patch)
tree954e04cafa9c30395c293487c100d59dc7ab31d8 /src/vnet/ip/ip.api
parent5d4b8912d2fe186b4fb920a72b3a2f7b556f4e7d (diff)
fib: Adjacency creation notifications for dlegates
Type: feature Signed-off-by: Neale Ranns <nranns@cisco.com> Change-Id: I3feddfe44dee528b9ca05aa0150e9423306ae49d
Diffstat (limited to 'src/vnet/ip/ip.api')
0 files changed, 0 insertions, 0 deletions
'n140' href='#n140'>140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 
/*
 * Copyright (c) 2018 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.
 */
/**
 * @file
 * @brief NAT66 inside to outside network translation
 */

#include <nat/nat66.h>
#include <vnet/ip/ip6_to_ip4.h>
#include <vnet/fib/fib_table.h>

typedef struct
{
  u32 sw_if_index;
  u32 next_index;
} nat66_in2out_trace_t;

static u8 *
format_nat66_in2out_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 *);
  nat66_in2out_trace_t *t = va_arg (*args, nat66_in2out_trace_t *);

  s =
    format (s, "NAT66-in2out: sw_if_index %d, next index %d", t->sw_if_index,
	    t->next_index);

  return s;
}

#define foreach_nat66_in2out_error                       \
_(IN2OUT_PACKETS, "good in2out packets processed")       \
_(NO_TRANSLATION, "no translation")                      \
_(UNKNOWN, "unknown")

typedef enum
{
#define _(sym,str) NAT66_IN2OUT_ERROR_##sym,
  foreach_nat66_in2out_error
#undef _
    NAT66_IN2OUT_N_ERROR,
} nat66_in2out_error_t;

static char *nat66_in2out_error_strings[] = {
#define _(sym,string) string,
  foreach_nat66_in2out_error
#undef _
};

typedef enum
{
  NAT66_IN2OUT_NEXT_IP6_LOOKUP,
  NAT66_IN2OUT_NEXT_DROP,
  NAT66_IN2OUT_N_NEXT,
} nat66_in2out_next_t;

static inline u8
nat66_not_translate (u32 rx_fib_index, ip6_address_t ip6_addr)
{
  nat66_main_t *nm = &nat66_main;
  u32 sw_if_index;
  snat_interface_t *i;
  fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
  fib_prefix_t pfx = {
    .fp_proto = FIB_PROTOCOL_IP6,
    .fp_len = 128,
    .fp_addr = {
		.ip6 = ip6_addr,
		},
  };

  fei = fib_table_lookup (rx_fib_index, &pfx);
  if (FIB_NODE_INDEX_INVALID == fei)
    return 1;
  sw_if_index = fib_entry_get_resolving_interface (fei);

  if (sw_if_index == ~0)
    {
      fei = fib_table_lookup (nm->outside_fib_index, &pfx);
      if (FIB_NODE_INDEX_INVALID == fei)
	return 1;
      sw_if_index = fib_entry_get_resolving_interface (fei);
    }

  /* *INDENT-OFF* */
  pool_foreach (i, nm->interfaces,
  ({
    /* NAT packet aimed at outside interface */
    if (nat_interface_is_outside (i) && sw_if_index == i->sw_if_index)
      return 0;
  }));
  /* *INDENT-ON* */

  return 1;
}

VLIB_NODE_FN (nat66_in2out_node) (vlib_main_t * vm,
				  vlib_node_runtime_t * node,
				  vlib_frame_t * frame)
{
  u32 n_left_from, *from, *to_next;
  nat66_in2out_next_t next_index;
  u32 pkts_processed = 0;
  u32 thread_index = vm->thread_index;
  nat66_main_t *nm = &nat66_main;

  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;
  next_index = node->cached_next_index;

  while (n_left_from > 0)
    {
      u32 n_left_to_next;

      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  u32 bi0;
	  vlib_buffer_t *b0;
	  u32 next0 = NAT66_IN2OUT_NEXT_IP6_LOOKUP;
	  ip6_header_t *ip60;
	  u16 l4_offset0, frag_offset0;
	  u8 l4_protocol0;
	  nat66_static_mapping_t *sm0;
	  u32 sw_if_index0, fib_index0;
	  udp_header_t *udp0;
	  tcp_header_t *tcp0;
	  icmp46_header_t *icmp0;
	  u16 *checksum0 = 0;
	  ip_csum_t csum0;

	  /* speculatively enqueue b0 to the current next frame */
	  bi0 = from[0];
	  to_next[0] = bi0;
	  from += 1;
	  to_next += 1;
	  n_left_from -= 1;
	  n_left_to_next -= 1;

	  b0 = vlib_get_buffer (vm, bi0);
	  ip60 = vlib_buffer_get_current (b0);

	  if (PREDICT_FALSE
	      (ip6_parse
	       (vm, b0, ip60, b0->current_length, &l4_protocol0, &l4_offset0,
		&frag_offset0)))
	    {
	      next0 = NAT66_IN2OUT_NEXT_DROP;
	      b0->error = node->errors[NAT66_IN2OUT_ERROR_UNKNOWN];
	      goto trace0;
	    }

	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
	  fib_index0 =
	    fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6,
						 sw_if_index0);

	  if (nat66_not_translate (fib_index0, ip60->dst_address))
	    goto trace0;

	  sm0 = nat66_static_mapping_get (&ip60->src_address, fib_index0, 1);
	  if (PREDICT_FALSE (!sm0))
	    {
	      goto trace0;
	    }

	  if (l4_protocol0 == IP_PROTOCOL_UDP)
	    {
	      udp0 = (udp_header_t *) u8_ptr_add (ip60, l4_offset0);
	      checksum0 = &udp0->checksum;
	    }
	  else if (l4_protocol0 == IP_PROTOCOL_TCP)
	    {
	      tcp0 = (tcp_header_t *) u8_ptr_add (ip60, l4_offset0);
	      checksum0 = &tcp0->checksum;
	    }
	  else if (l4_protocol0 == IP_PROTOCOL_ICMP6)
	    {
	      icmp0 = (icmp46_header_t *) u8_ptr_add (ip60, l4_offset0);
	      checksum0 = &icmp0->checksum;
	    }
	  else
	    goto skip_csum0;

	  csum0 = ip_csum_sub_even (*checksum0, ip60->src_address.as_u64[0]);
	  csum0 = ip_csum_sub_even (csum0, ip60->src_address.as_u64[1]);
	  csum0 = ip_csum_add_even (csum0, sm0->e_addr.as_u64[0]);
	  csum0 = ip_csum_add_even (csum0, sm0->e_addr.as_u64[1]);
	  *checksum0 = ip_csum_fold (csum0);

	skip_csum0:
	  ip60->src_address.as_u64[0] = sm0->e_addr.as_u64[0];
	  ip60->src_address.as_u64[1] = sm0->e_addr.as_u64[1];

	  vlib_increment_combined_counter (&nm->session_counters,
					   thread_index, sm0 - nm->sm, 1,
					   vlib_buffer_length_in_chain (vm,
									b0));

	trace0:
	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
	    {
	      nat66_in2out_trace_t *t =
		vlib_add_trace (vm, node, b0, sizeof (*t));
	      t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
	      t->next_index = next0;
	    }

	  pkts_processed += next0 != NAT66_IN2OUT_NEXT_DROP;

	  /* verify speculative enqueue, maybe switch current next frame */
	  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);
    }

  vlib_node_increment_counter (vm, nm->in2out_node_index,
			       NAT66_IN2OUT_ERROR_IN2OUT_PACKETS,
			       pkts_processed);
  return frame->n_vectors;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (nat66_in2out_node) = {
  .name = "nat66-in2out",
  .vector_size = sizeof (u32),
  .format_trace = format_nat66_in2out_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN (nat66_in2out_error_strings),
  .error_strings = nat66_in2out_error_strings,
  .n_next_nodes = NAT66_IN2OUT_N_NEXT,
  /* edit / add dispositions here */
  .next_nodes = {
    [NAT66_IN2OUT_NEXT_DROP] = "error-drop",
    [NAT66_IN2OUT_NEXT_IP6_LOOKUP] = "ip6-lookup",
  },
};
/* *INDENT-ON* */

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