1 files changed, 377 insertions, 0 deletions

diff --git a/src/plugins/sixrd/sixrd.c b/src/plugins/sixrd/sixrd.c
new file mode 100644
index 00000000..98387525
--- /dev/null
+++ b/src/plugins/sixrd/sixrd.c
@@ -0,0 +1,377 @@
+/*
+ * 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 "sixrd.h"
+#include <vnet/plugin/plugin.h>
+
+#include <vnet/fib/fib_table.h>
+#include <vnet/fib/ip6_fib.h>
+#include <vnet/adj/adj.h>
+#include <vpp/app/version.h>
+
+/*
+ * This code supports the following sixrd modes:
+ * 
+ * 32 EA bits (Complete IPv4 address is embedded):
+ *   ea_bits_len = 32
+ * IPv4 suffix is embedded:
+ *   ea_bits_len = < 32
+ * No embedded address bits (1:1 mode):
+ *   ea_bits_len = 0
+ */
+
+int
+sixrd_create_domain (ip6_address_t *ip6_prefix,
+		     u8 ip6_prefix_len,
+		     ip4_address_t *ip4_prefix,
+		     u8 ip4_prefix_len,
+		     ip4_address_t *ip4_src,
+		     u32 *sixrd_domain_index,
+		     u16 mtu)
+{
+  dpo_id_t dpo_v6 = DPO_INVALID, dpo_v4 = DPO_INVALID;
+  sixrd_main_t *mm = &sixrd_main;
+  fib_node_index_t fei;
+  sixrd_domain_t *d;
+
+  /* Get domain index */
+  pool_get_aligned(mm->domains, d, CLIB_CACHE_LINE_BYTES);
+  memset(d, 0, sizeof (*d));
+  *sixrd_domain_index = d - mm->domains;
+
+  /* Init domain struct */
+  d->ip4_prefix.as_u32 = ip4_prefix->as_u32;
+  d->ip4_prefix_len = ip4_prefix_len;
+  d->ip6_prefix = *ip6_prefix;
+  d->ip6_prefix_len = ip6_prefix_len;
+  d->ip4_src = *ip4_src;
+  d->mtu = mtu;
+
+  if (ip4_prefix_len < 32)
+    d->shift = 64 - ip6_prefix_len + (32 - ip4_prefix_len);
+    
+  /* Create IPv6 route/adjacency */
+  fib_prefix_t pfx6 = {
+      .fp_proto = FIB_PROTOCOL_IP6,
+      .fp_len = d->ip6_prefix_len,
+      .fp_addr = {
+	  .ip6 = d->ip6_prefix,
+      },
+  };
+  sixrd_dpo_create(DPO_PROTO_IP6,
+		   *sixrd_domain_index,
+		   &dpo_v6);
+  fib_table_entry_special_dpo_add(0, &pfx6,
+				  FIB_SOURCE_SIXRD,
+				  FIB_ENTRY_FLAG_EXCLUSIVE,
+				  &dpo_v6);
+  dpo_reset (&dpo_v6);
+
+  /*
+   * Multiple SIXRD domains may share same source IPv4 TEP
+   * In this case the route will exist and be SixRD sourced.
+   * Find the adj (if any) already contributed and modify it
+   */
+  fib_prefix_t pfx4 = {
+      .fp_proto = FIB_PROTOCOL_IP4,
+      .fp_len = 32,
+      .fp_addr = {
+	  .ip4 = d->ip4_src,
+      },
+  };
+  fei = fib_table_lookup_exact_match(0, &pfx4);
+
+  if (FIB_NODE_INDEX_INVALID != fei)
+  {
+      dpo_id_t dpo = DPO_INVALID;
+
+      if (fib_entry_get_dpo_for_source (fei, FIB_SOURCE_SIXRD, &dpo))
+      {
+	  /*
+	   * modify the existing adj to indicate it's shared
+	   * skip to route add.
+	   * It is locked to pair with the unlock below.
+	   */
+	  const dpo_id_t *sd_dpo;
+	  sixrd_dpo_t *sd;
+
+	  ASSERT(DPO_LOAD_BALANCE == dpo.dpoi_type);
+
+	  sd_dpo = load_balance_get_bucket(dpo.dpoi_index, 0);
+	  sd = sixrd_dpo_get (sd_dpo->dpoi_index);
+
+	  sd->sd_domain = ~0;
+	  dpo_copy (&dpo_v4, sd_dpo);
+	  dpo_reset (&dpo);
+
+	  goto route_add;
+      }
+  }
+  /* first time addition of the route */
+  sixrd_dpo_create(DPO_PROTO_IP4,
+		   *sixrd_domain_index,
+		   &dpo_v4);
+
+route_add:
+  /*
+   * Create ip4 route. This is a reference counted add. If the prefix
+   * already exists and is SixRD sourced, it is now SixRD source n+1 times
+   * and will need to be removed n+1 times.
+   */
+  fib_table_entry_special_dpo_add(0, &pfx4,
+				  FIB_SOURCE_SIXRD,
+				  FIB_ENTRY_FLAG_EXCLUSIVE,
+				  &dpo_v4);
+  dpo_reset (&dpo_v4);
+
+  return 0;
+}
+
+/*
+ * sixrd_delete_domain
+ */
+int
+sixrd_delete_domain (u32 sixrd_domain_index)
+{
+  sixrd_main_t *mm = &sixrd_main;
+  sixrd_domain_t *d;
+
+  if (pool_is_free_index(mm->domains, sixrd_domain_index)) {
+    clib_warning("SIXRD domain delete: domain does not exist: %d",
+		 sixrd_domain_index);
+    return -1;
+  }
+
+  d = pool_elt_at_index(mm->domains, sixrd_domain_index);
+
+  fib_prefix_t pfx = {
+      .fp_proto = FIB_PROTOCOL_IP4,
+      .fp_len = 32,
+      .fp_addr = {
+	  .ip4 = d->ip4_src,
+      },
+  };
+  fib_table_entry_special_remove(0, &pfx, FIB_SOURCE_SIXRD);
+
+  fib_prefix_t pfx6 = {
+      .fp_proto = FIB_PROTOCOL_IP6,
+      .fp_len = d->ip6_prefix_len,
+      .fp_addr = {
+	  .ip6 = d->ip6_prefix,
+      },
+  };
+  fib_table_entry_special_remove(0, &pfx6, FIB_SOURCE_SIXRD);
+
+  pool_put(mm->domains, d);
+
+  return 0;
+}
+
+static clib_error_t *
+sixrd_add_domain_command_fn (vlib_main_t *vm,
+                           unformat_input_t *input,
+                           vlib_cli_command_t *cmd)
+{
+  unformat_input_t _line_input, *line_input = &_line_input;
+  ip4_address_t ip4_prefix;
+  ip6_address_t ip6_prefix;
+  ip4_address_t ip4_src;
+  u32 ip6_prefix_len=0, ip4_prefix_len=0, sixrd_domain_index;
+  u32 num_m_args = 0;
+  /* Optional arguments */
+  u32 mtu = 0;
+  clib_error_t *error = 0;
+
+  /* Get a line of input. */
+  if (!unformat_user(input, unformat_line_input, line_input))
+    return 0;
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) {
+    if (unformat(line_input, "ip6-pfx %U/%d", unformat_ip6_address, &ip6_prefix, &ip6_prefix_len))
+      num_m_args++;
+    else if (unformat(line_input, "ip4-pfx %U/%d", unformat_ip4_address, &ip4_prefix, &ip4_prefix_len))
+      num_m_args++;
+    else if (unformat(line_input, "ip4-src %U", unformat_ip4_address, &ip4_src))
+      num_m_args++;
+    else if (unformat(line_input, "mtu %d", &mtu))
+      num_m_args++;
+    else {
+      error = clib_error_return(0, "unknown input `%U'",
+                                format_unformat_error, line_input);
+      goto done;
+    }
+  }
+
+  if (num_m_args < 3) {
+    error = clib_error_return(0, "mandatory argument(s) missing");
+    goto done;
+  }
+
+  sixrd_create_domain(&ip6_prefix, ip6_prefix_len, &ip4_prefix, ip4_prefix_len,
+		      &ip4_src, &sixrd_domain_index, mtu);
+
+done:
+  unformat_free (line_input);
+
+  return error;
+}
+
+static clib_error_t *
+sixrd_del_domain_command_fn (vlib_main_t *vm,
+			   unformat_input_t *input,
+			   vlib_cli_command_t *cmd)
+{
+  unformat_input_t _line_input, *line_input = &_line_input;
+  u32 num_m_args = 0;
+  u32 sixrd_domain_index;
+  clib_error_t *error = 0;
+
+  /* Get a line of input. */
+  if (! unformat_user(input, unformat_line_input, line_input))
+    return 0;
+ 
+  while (unformat_check_input(line_input) != UNFORMAT_END_OF_INPUT) {
+    if (unformat(line_input, "index %d", &sixrd_domain_index))
+      num_m_args++;
+    else {
+      error = clib_error_return(0, "unknown input `%U'",
+				format_unformat_error, line_input);
+      goto done;
+    }
+  }
+
+  if (num_m_args != 1) {
+    error = clib_error_return(0, "mandatory argument(s) missing");
+    goto done;
+  }
+
+  sixrd_delete_domain(sixrd_domain_index);
+
+done:
+  unformat_free (line_input);
+
+  return error;
+}
+
+static u8 *
+format_sixrd_domain (u8 *s, va_list *args)
+{
+  sixrd_domain_t *d = va_arg(*args, sixrd_domain_t *);
+  sixrd_main_t *mm = &sixrd_main;
+
+  s = format(s,
+	     "[%d] ip6-pfx %U/%d ip4-pfx %U/%d ip4-src %U mtu %d",
+	     d - mm->domains,
+	     format_ip6_address, &d->ip6_prefix, d->ip6_prefix_len,
+	     format_ip4_address, &d->ip4_prefix, d->ip4_prefix_len,
+	     format_ip4_address, &d->ip4_src, d->mtu);
+
+  return s;
+}
+
+static clib_error_t *
+show_sixrd_domain_command_fn (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
+{
+  sixrd_main_t *mm = &sixrd_main;
+  sixrd_domain_t *d;
+
+  if (pool_elts(mm->domains) == 0)
+    vlib_cli_output(vm, "No SIXRD domains are configured...");
+
+  pool_foreach(d, mm->domains, ({vlib_cli_output(vm, "%U", format_sixrd_domain, d);}));
+
+  return 0;
+
+}
+
+static clib_error_t *
+show_sixrd_stats_command_fn (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
+{
+  sixrd_main_t *mm = &sixrd_main;
+  sixrd_domain_t *d;
+  int domains = 0, domaincount = 0;
+  if (pool_elts (mm->domains) == 0)
+    vlib_cli_output (vm, "No SIXRD domains are configured...");
+
+  pool_foreach(d, mm->domains, ({
+    domains += sizeof(*d);
+    domaincount++;
+  }));
+
+  vlib_cli_output(vm, "SIXRD domains structure: %d\n", sizeof (sixrd_domain_t));
+  vlib_cli_output(vm, "SIXRD domains: %d (%d bytes)\n", domaincount, domains);
+
+  return 0;
+}
+
+/*
+ * packet trace format function
+ */
+u8 *
+format_sixrd_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 *);
+  sixrd_trace_t *t = va_arg (*args, sixrd_trace_t *);
+  u32 sixrd_domain_index = t->sixrd_domain_index;
+
+  s = format(s, "SIXRD domain index: %d", sixrd_domain_index);
+
+  return s;
+}
+
+VLIB_CLI_COMMAND(sixrd_add_domain_command, static) = {
+  .path = "sixrd add domain",
+  .short_help = 
+  "sixrd add domain ip6-pfx <ip6-pfx> ip4-pfx <ip4-pfx> ip4-src <ip4-addr>",
+  .function = sixrd_add_domain_command_fn,
+};
+
+VLIB_CLI_COMMAND(sixrd_del_command, static) = {
+  .path = "sixrd del domain",
+  .short_help = 
+  "sixrd del domain index <domain>",
+  .function = sixrd_del_domain_command_fn,
+};
+
+VLIB_CLI_COMMAND(show_sixrd_domain_command, static) = {
+  .path = "show sixrd domain",
+  .function = show_sixrd_domain_command_fn,
+};
+
+VLIB_CLI_COMMAND(show_sixrd_stats_command, static) = {
+  .path = "show sixrd stats",
+  .function = show_sixrd_stats_command_fn,
+};
+
+/* *INDENT-OFF* */
+VLIB_PLUGIN_REGISTER () ={
+    .version = VPP_BUILD_VER,
+    .description = "IPv6 Rapid Deployment on IPv4 Infrastructure (RFC5969)",
+};
+/* *INDENT-ON* */
+
+static clib_error_t * sixrd_init (vlib_main_t * vm)
+{
+  sixrd_main_t *mm = &sixrd_main;
+
+  mm->vnet_main = vnet_get_main();
+  mm->vlib_main = vm;
+
+  sixrd_dpo_module_init ();
+
+  return (NULL);
+}
+
+VLIB_INIT_FUNCTION (sixrd_init);