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-rw-r--r--vnet/vnet/fib/ip6_fib.c698
1 files changed, 698 insertions, 0 deletions
diff --git a/vnet/vnet/fib/ip6_fib.c b/vnet/vnet/fib/ip6_fib.c
new file mode 100644
index 00000000000..772ce74430b
--- /dev/null
+++ b/vnet/vnet/fib/ip6_fib.c
@@ -0,0 +1,698 @@
+/*
+ * Copyright (c) 2016 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/fib/ip6_fib.h>
+#include <vnet/fib/fib_table.h>
+
+static void
+vnet_ip6_fib_init (u32 fib_index)
+{
+ fib_prefix_t pfx = {
+ .fp_proto = FIB_PROTOCOL_IP6,
+ .fp_len = 0,
+ .fp_addr = {
+ .ip6 = {
+ { 0, 0, },
+ },
+ }
+ };
+
+ /*
+ * Add the default route.
+ */
+ fib_table_entry_special_add(fib_index,
+ &pfx,
+ FIB_SOURCE_DEFAULT_ROUTE,
+ FIB_ENTRY_FLAG_DROP,
+ ADJ_INDEX_INVALID);
+
+ /*
+ * Add ff02::1:ff00:0/104 via local route for all tables.
+ * This is required for neighbor discovery to work.
+ */
+ ip6_set_solicited_node_multicast_address(&pfx.fp_addr.ip6, 0);
+ pfx.fp_len = 104;
+ fib_table_entry_special_add(fib_index,
+ &pfx,
+ FIB_SOURCE_SPECIAL,
+ FIB_ENTRY_FLAG_LOCAL,
+ ADJ_INDEX_INVALID);
+
+ /*
+ * Add all-routers multicast address via local route for all tables
+ */
+ ip6_set_reserved_multicast_address (&pfx.fp_addr.ip6,
+ IP6_MULTICAST_SCOPE_link_local,
+ IP6_MULTICAST_GROUP_ID_all_routers);
+ pfx.fp_len = 128;
+ fib_table_entry_special_add(fib_index,
+ &pfx,
+ FIB_SOURCE_SPECIAL,
+ FIB_ENTRY_FLAG_LOCAL,
+ ADJ_INDEX_INVALID);
+
+ /*
+ * Add all-nodes multicast address via local route for all tables
+ */
+ ip6_set_reserved_multicast_address (&pfx.fp_addr.ip6,
+ IP6_MULTICAST_SCOPE_link_local,
+ IP6_MULTICAST_GROUP_ID_all_hosts);
+ pfx.fp_len = 128;
+ fib_table_entry_special_add(fib_index,
+ &pfx,
+ FIB_SOURCE_SPECIAL,
+ FIB_ENTRY_FLAG_LOCAL,
+ ADJ_INDEX_INVALID);
+
+ /*
+ * Add all-mldv2 multicast address via local route for all tables
+ */
+ ip6_set_reserved_multicast_address (&pfx.fp_addr.ip6,
+ IP6_MULTICAST_SCOPE_link_local,
+ IP6_MULTICAST_GROUP_ID_mldv2_routers);
+ pfx.fp_len = 128;
+ fib_table_entry_special_add(fib_index,
+ &pfx,
+ FIB_SOURCE_SPECIAL,
+ FIB_ENTRY_FLAG_LOCAL,
+ ADJ_INDEX_INVALID);
+
+ /*
+ * all link local for us
+ */
+ pfx.fp_addr.ip6.as_u64[0] = clib_host_to_net_u64 (0xFE80000000000000ULL);
+ pfx.fp_addr.ip6.as_u64[1] = 0;
+ pfx.fp_len = 10;
+ fib_table_entry_special_add(fib_index,
+ &pfx,
+ FIB_SOURCE_SPECIAL,
+ FIB_ENTRY_FLAG_LOCAL,
+ ADJ_INDEX_INVALID);
+}
+
+static u32
+create_fib_with_table_id (u32 table_id)
+{
+ fib_table_t *fib_table;
+
+ pool_get_aligned(ip6_main.fibs, fib_table, CLIB_CACHE_LINE_BYTES);
+ memset(fib_table, 0, sizeof(*fib_table));
+
+ fib_table->ft_proto = FIB_PROTOCOL_IP6;
+ fib_table->ft_index =
+ fib_table->v6.index =
+ (fib_table - ip6_main.fibs);
+
+ hash_set(ip6_main.fib_index_by_table_id, table_id, fib_table->ft_index);
+
+ fib_table->ft_table_id =
+ fib_table->v6.table_id =
+ table_id;
+ fib_table->ft_flow_hash_config =
+ fib_table->v6.flow_hash_config =
+ IP_FLOW_HASH_DEFAULT;
+
+ vnet_ip6_fib_init(fib_table->ft_index);
+ fib_table_lock(fib_table->ft_index, FIB_PROTOCOL_IP6);
+
+ return (fib_table->ft_index);
+}
+
+u32
+ip6_fib_table_find_or_create_and_lock (u32 table_id)
+{
+ uword * p;
+
+ p = hash_get (ip6_main.fib_index_by_table_id, table_id);
+ if (NULL == p)
+ return create_fib_with_table_id(table_id);
+
+ fib_table_lock(p[0], FIB_PROTOCOL_IP6);
+
+ return (p[0]);
+}
+
+u32
+ip6_fib_table_create_and_lock (void)
+{
+ return (create_fib_with_table_id(~0));
+}
+
+void
+ip6_fib_table_destroy (u32 fib_index)
+{
+ fib_prefix_t pfx = {
+ .fp_proto = FIB_PROTOCOL_IP6,
+ .fp_len = 0,
+ .fp_addr = {
+ .ip6 = {
+ { 0, 0, },
+ },
+ }
+ };
+
+ /*
+ * the default route.
+ */
+ fib_table_entry_special_remove(fib_index,
+ &pfx,
+ FIB_SOURCE_DEFAULT_ROUTE);
+
+
+ /*
+ * ff02::1:ff00:0/104
+ */
+ ip6_set_solicited_node_multicast_address(&pfx.fp_addr.ip6, 0);
+ pfx.fp_len = 104;
+ fib_table_entry_special_remove(fib_index,
+ &pfx,
+ FIB_SOURCE_SPECIAL);
+
+ /*
+ * all-routers multicast address
+ */
+ ip6_set_reserved_multicast_address (&pfx.fp_addr.ip6,
+ IP6_MULTICAST_SCOPE_link_local,
+ IP6_MULTICAST_GROUP_ID_all_routers);
+ pfx.fp_len = 128;
+ fib_table_entry_special_remove(fib_index,
+ &pfx,
+ FIB_SOURCE_SPECIAL);
+
+ /*
+ * all-nodes multicast address
+ */
+ ip6_set_reserved_multicast_address (&pfx.fp_addr.ip6,
+ IP6_MULTICAST_SCOPE_link_local,
+ IP6_MULTICAST_GROUP_ID_all_hosts);
+ pfx.fp_len = 128;
+ fib_table_entry_special_remove(fib_index,
+ &pfx,
+ FIB_SOURCE_SPECIAL);
+
+ /*
+ * all-mldv2 multicast address
+ */
+ ip6_set_reserved_multicast_address (&pfx.fp_addr.ip6,
+ IP6_MULTICAST_SCOPE_link_local,
+ IP6_MULTICAST_GROUP_ID_mldv2_routers);
+ pfx.fp_len = 128;
+ fib_table_entry_special_remove(fib_index,
+ &pfx,
+ FIB_SOURCE_SPECIAL);
+
+ /*
+ * all link local
+ */
+ pfx.fp_addr.ip6.as_u64[0] = clib_host_to_net_u64 (0xFE80000000000000ULL);
+ pfx.fp_addr.ip6.as_u64[1] = 0;
+ pfx.fp_len = 10;
+ fib_table_entry_special_remove(fib_index,
+ &pfx,
+ FIB_SOURCE_SPECIAL);
+
+ fib_table_t *fib_table = fib_table_get(fib_index, FIB_PROTOCOL_IP6);
+ fib_source_t source;
+
+ /*
+ * validate no more routes.
+ */
+ ASSERT(0 == fib_table->ft_total_route_counts);
+ FOR_EACH_FIB_SOURCE(source)
+ {
+ ASSERT(0 == fib_table->ft_src_route_counts[source]);
+ }
+
+ if (~0 != fib_table->ft_table_id)
+ {
+ hash_unset (ip6_main.fib_index_by_table_id, fib_table->ft_table_id);
+ }
+ pool_put(ip6_main.fibs, fib_table);
+}
+
+fib_node_index_t
+ip6_fib_table_lookup (u32 fib_index,
+ const ip6_address_t *addr,
+ u32 len)
+{
+ const ip6_fib_table_instance_t *table;
+ BVT(clib_bihash_kv) kv, value;
+ int i, n_p, rv;
+ u64 fib;
+
+ table = &ip6_main.ip6_table[IP6_FIB_TABLE_NON_FWDING];
+ n_p = vec_len (table->prefix_lengths_in_search_order);
+
+ kv.key[0] = addr->as_u64[0];
+ kv.key[1] = addr->as_u64[1];
+ fib = ((u64)((fib_index))<<32);
+
+ /*
+ * start search from a mask length same length or shorter.
+ * we don't want matches longer than the mask passed
+ */
+ i = 0;
+ while (i < n_p && table->prefix_lengths_in_search_order[i] > len)
+ {
+ i++;
+ }
+
+ for (; i < n_p; i++)
+ {
+ int dst_address_length = table->prefix_lengths_in_search_order[i];
+ ip6_address_t * mask = &ip6_main.fib_masks[dst_address_length];
+
+ ASSERT(dst_address_length >= 0 && dst_address_length <= 128);
+ //As lengths are decreasing, masks are increasingly specific.
+ kv.key[0] &= mask->as_u64[0];
+ kv.key[1] &= mask->as_u64[1];
+ kv.key[2] = fib | dst_address_length;
+
+ rv = BV(clib_bihash_search_inline_2)(&table->ip6_hash, &kv, &value);
+ if (rv == 0)
+ return value.value;
+ }
+
+ return (FIB_NODE_INDEX_INVALID);
+}
+
+fib_node_index_t
+ip6_fib_table_lookup_exact_match (u32 fib_index,
+ const ip6_address_t *addr,
+ u32 len)
+{
+ const ip6_fib_table_instance_t *table;
+ BVT(clib_bihash_kv) kv, value;
+ ip6_address_t *mask;
+ u64 fib;
+ int rv;
+
+ table = &ip6_main.ip6_table[IP6_FIB_TABLE_NON_FWDING];
+ mask = &ip6_main.fib_masks[len];
+ fib = ((u64)((fib_index))<<32);
+
+ kv.key[0] = addr->as_u64[0] & mask->as_u64[0];
+ kv.key[1] = addr->as_u64[1] & mask->as_u64[1];
+ kv.key[2] = fib | len;
+
+ rv = BV(clib_bihash_search_inline_2)(&table->ip6_hash, &kv, &value);
+ if (rv == 0)
+ return value.value;
+
+ return (FIB_NODE_INDEX_INVALID);
+}
+
+static void
+compute_prefix_lengths_in_search_order (ip6_fib_table_instance_t *table)
+{
+ int i;
+ vec_reset_length (table->prefix_lengths_in_search_order);
+ /* Note: bitmap reversed so this is in fact a longest prefix match */
+ clib_bitmap_foreach (i, table->non_empty_dst_address_length_bitmap,
+ ({
+ int dst_address_length = 128 - i;
+ vec_add1(table->prefix_lengths_in_search_order, dst_address_length);
+ }));
+}
+
+void
+ip6_fib_table_entry_remove (u32 fib_index,
+ const ip6_address_t *addr,
+ u32 len)
+{
+ ip6_fib_table_instance_t *table;
+ BVT(clib_bihash_kv) kv;
+ ip6_address_t *mask;
+ u64 fib;
+
+ table = &ip6_main.ip6_table[IP6_FIB_TABLE_NON_FWDING];
+ mask = &ip6_main.fib_masks[len];
+ fib = ((u64)((fib_index))<<32);
+
+ kv.key[0] = addr->as_u64[0] & mask->as_u64[0];
+ kv.key[1] = addr->as_u64[1] & mask->as_u64[1];
+ kv.key[2] = fib | len;
+
+ BV(clib_bihash_add_del)(&table->ip6_hash, &kv, 0);
+
+ /* refcount accounting */
+ ASSERT (table->dst_address_length_refcounts[len] > 0);
+ if (--table->dst_address_length_refcounts[len] == 0)
+ {
+ table->non_empty_dst_address_length_bitmap =
+ clib_bitmap_set (table->non_empty_dst_address_length_bitmap,
+ 128 - len, 0);
+ compute_prefix_lengths_in_search_order (table);
+ }
+}
+
+void
+ip6_fib_table_entry_insert (u32 fib_index,
+ const ip6_address_t *addr,
+ u32 len,
+ fib_node_index_t fib_entry_index)
+{
+ ip6_fib_table_instance_t *table;
+ BVT(clib_bihash_kv) kv;
+ ip6_address_t *mask;
+ u64 fib;
+
+ table = &ip6_main.ip6_table[IP6_FIB_TABLE_NON_FWDING];
+ mask = &ip6_main.fib_masks[len];
+ fib = ((u64)((fib_index))<<32);
+
+ kv.key[0] = addr->as_u64[0] & mask->as_u64[0];
+ kv.key[1] = addr->as_u64[1] & mask->as_u64[1];
+ kv.key[2] = fib | len;
+ kv.value = fib_entry_index;
+
+ BV(clib_bihash_add_del)(&table->ip6_hash, &kv, 1);
+
+ table->dst_address_length_refcounts[len]++;
+
+ table->non_empty_dst_address_length_bitmap =
+ clib_bitmap_set (table->non_empty_dst_address_length_bitmap,
+ 128 - len, 1);
+ compute_prefix_lengths_in_search_order (table);
+}
+
+u32
+ip6_fib_table_fwding_lookup (ip6_main_t * im,
+ u32 fib_index,
+ const ip6_address_t * dst)
+{
+ const ip6_fib_table_instance_t *table;
+ int i, len;
+ int rv;
+ BVT(clib_bihash_kv) kv, value;
+ u64 fib;
+
+ table = &ip6_main.ip6_table[IP6_FIB_TABLE_FWDING];
+ len = vec_len (table->prefix_lengths_in_search_order);
+
+ kv.key[0] = dst->as_u64[0];
+ kv.key[1] = dst->as_u64[1];
+ fib = ((u64)((fib_index))<<32);
+
+ for (i = 0; i < len; i++)
+ {
+ int dst_address_length = table->prefix_lengths_in_search_order[i];
+ ip6_address_t * mask = &ip6_main.fib_masks[dst_address_length];
+
+ ASSERT(dst_address_length >= 0 && dst_address_length <= 128);
+ //As lengths are decreasing, masks are increasingly specific.
+ kv.key[0] &= mask->as_u64[0];
+ kv.key[1] &= mask->as_u64[1];
+ kv.key[2] = fib | dst_address_length;
+
+ rv = BV(clib_bihash_search_inline_2)(&table->ip6_hash, &kv, &value);
+ if (rv == 0)
+ return value.value;
+ }
+
+ /* default route is always present */
+ ASSERT(0);
+ return 0;
+}
+
+u32 ip6_fib_table_fwding_lookup_with_if_index (ip6_main_t * im,
+ u32 sw_if_index,
+ const ip6_address_t * dst)
+{
+ u32 fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
+ return ip6_fib_table_fwding_lookup(im, fib_index, dst);
+}
+
+flow_hash_config_t
+ip6_fib_table_get_flow_hash_config (u32 fib_index)
+{
+ return (ip6_fib_get(fib_index)->flow_hash_config);
+}
+
+u32
+ip6_fib_table_get_index_for_sw_if_index (u32 sw_if_index)
+{
+ if (sw_if_index >= vec_len(ip6_main.fib_index_by_sw_if_index))
+ {
+ /*
+ * This is the case for interfaces that are not yet mapped to
+ * a IP table
+ */
+ return (~0);
+ }
+ return (ip6_main.fib_index_by_sw_if_index[sw_if_index]);
+}
+
+void
+ip6_fib_table_fwding_dpo_update (u32 fib_index,
+ const ip6_address_t *addr,
+ u32 len,
+ const dpo_id_t *dpo)
+{
+ ip6_fib_table_instance_t *table;
+ BVT(clib_bihash_kv) kv;
+ ip6_address_t *mask;
+ u64 fib;
+
+ table = &ip6_main.ip6_table[IP6_FIB_TABLE_FWDING];
+ mask = &ip6_main.fib_masks[len];
+ fib = ((u64)((fib_index))<<32);
+
+ kv.key[0] = addr->as_u64[0] & mask->as_u64[0];
+ kv.key[1] = addr->as_u64[1] & mask->as_u64[1];
+ kv.key[2] = fib | len;
+ kv.value = dpo->dpoi_index;
+
+ BV(clib_bihash_add_del)(&table->ip6_hash, &kv, 1);
+
+ table->dst_address_length_refcounts[len]++;
+
+ table->non_empty_dst_address_length_bitmap =
+ clib_bitmap_set (table->non_empty_dst_address_length_bitmap,
+ 128 - len, 1);
+ compute_prefix_lengths_in_search_order (table);
+}
+
+void
+ip6_fib_table_fwding_dpo_remove (u32 fib_index,
+ const ip6_address_t *addr,
+ u32 len,
+ const dpo_id_t *dpo)
+{
+ ip6_fib_table_instance_t *table;
+ BVT(clib_bihash_kv) kv;
+ ip6_address_t *mask;
+ u64 fib;
+
+ table = &ip6_main.ip6_table[IP6_FIB_TABLE_FWDING];
+ mask = &ip6_main.fib_masks[len];
+ fib = ((u64)((fib_index))<<32);
+
+ kv.key[0] = addr->as_u64[0] & mask->as_u64[0];
+ kv.key[1] = addr->as_u64[1] & mask->as_u64[1];
+ kv.key[2] = fib | len;
+ kv.value = dpo->dpoi_index;
+
+ BV(clib_bihash_add_del)(&table->ip6_hash, &kv, 0);
+
+ /* refcount accounting */
+ ASSERT (table->dst_address_length_refcounts[len] > 0);
+ if (--table->dst_address_length_refcounts[len] == 0)
+ {
+ table->non_empty_dst_address_length_bitmap =
+ clib_bitmap_set (table->non_empty_dst_address_length_bitmap,
+ 128 - len, 0);
+ compute_prefix_lengths_in_search_order (table);
+ }
+}
+
+typedef struct ip6_fib_show_ctx_t_ {
+ u32 fib_index;
+ fib_node_index_t *entries;
+} ip6_fib_show_ctx_t;
+
+static void
+ip6_fib_table_collect_entries (clib_bihash_kv_24_8_t * kvp,
+ void *arg)
+{
+ ip6_fib_show_ctx_t *ctx = arg;
+
+ if ((kvp->key[2] >> 32) == ctx->fib_index)
+ {
+ vec_add1(ctx->entries, kvp->value);
+ }
+}
+
+static void
+ip6_fib_table_show_all (ip6_fib_t *fib,
+ vlib_main_t * vm)
+{
+ fib_node_index_t *fib_entry_index;
+ ip6_fib_show_ctx_t ctx = {
+ .fib_index = fib->index,
+ .entries = NULL,
+ };
+ ip6_main_t *im = &ip6_main;
+
+ BV(clib_bihash_foreach_key_value_pair)(&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash,
+ ip6_fib_table_collect_entries,
+ &ctx);
+
+ vec_sort_with_function(ctx.entries, fib_entry_cmp_for_sort);
+
+ vec_foreach(fib_entry_index, ctx.entries)
+ {
+ vlib_cli_output(vm, "%U",
+ format_fib_entry,
+ *fib_entry_index,
+ FIB_ENTRY_FORMAT_BRIEF);
+ }
+
+ vec_free(ctx.entries);
+}
+
+static void
+ip6_fib_table_show_one (ip6_fib_t *fib,
+ vlib_main_t * vm,
+ ip6_address_t *address,
+ u32 mask_len)
+{
+ vlib_cli_output(vm, "%U",
+ format_fib_entry,
+ ip6_fib_table_lookup(fib->index, address, mask_len),
+ FIB_ENTRY_FORMAT_DETAIL);
+}
+
+typedef struct {
+ u32 fib_index;
+ u64 count_by_prefix_length[129];
+} count_routes_in_fib_at_prefix_length_arg_t;
+
+static void count_routes_in_fib_at_prefix_length
+(BVT(clib_bihash_kv) * kvp, void *arg)
+{
+ count_routes_in_fib_at_prefix_length_arg_t * ap = arg;
+ int mask_width;
+
+ if ((kvp->key[2]>>32) != ap->fib_index)
+ return;
+
+ mask_width = kvp->key[2] & 0xFF;
+
+ ap->count_by_prefix_length[mask_width]++;
+}
+
+static clib_error_t *
+ip6_show_fib (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ count_routes_in_fib_at_prefix_length_arg_t _ca, *ca = &_ca;
+ ip6_main_t * im6 = &ip6_main;
+ fib_table_t *fib_table;
+ ip6_fib_t * fib;
+ int verbose, matching;
+ ip6_address_t matching_address;
+ u32 mask_len = 128;
+ int table_id = -1, fib_index = ~0;
+
+ verbose = 1;
+ matching = 0;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "brief") ||
+ unformat (input, "summary") ||
+ unformat (input, "sum"))
+ verbose = 0;
+
+ else if (unformat (input, "%U/%d",
+ unformat_ip6_address, &matching_address, &mask_len))
+ matching = 1;
+
+ else if (unformat (input, "%U", unformat_ip6_address, &matching_address))
+ matching = 1;
+
+ else if (unformat (input, "table %d", &table_id))
+ ;
+ else if (unformat (input, "index %d", &fib_index))
+ ;
+ else
+ break;
+ }
+
+ pool_foreach (fib_table, im6->fibs,
+ ({
+ fib = &(fib_table->v6);
+ if (table_id >= 0 && table_id != (int)fib->table_id)
+ continue;
+ if (fib_index != ~0 && fib_index != (int)fib->index)
+ continue;
+
+ vlib_cli_output (vm, "%s, fib_index %d, flow hash: %U",
+ fib_table->ft_desc, fib->index,
+ format_ip_flow_hash_config, fib->flow_hash_config);
+
+ /* Show summary? */
+ if (! verbose)
+ {
+ BVT(clib_bihash) * h = &im6->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash;
+ int len;
+
+ vlib_cli_output (vm, "%=20s%=16s", "Prefix length", "Count");
+
+ memset (ca, 0, sizeof(*ca));
+ ca->fib_index = fib->index;
+
+ BV(clib_bihash_foreach_key_value_pair)
+ (h, count_routes_in_fib_at_prefix_length, ca);
+
+ for (len = 128; len >= 0; len--)
+ {
+ if (ca->count_by_prefix_length[len])
+ vlib_cli_output (vm, "%=20d%=16lld",
+ len, ca->count_by_prefix_length[len]);
+ }
+ continue;
+ }
+
+ if (!matching)
+ {
+ ip6_fib_table_show_all(fib, vm);
+ }
+ else
+ {
+ ip6_fib_table_show_one(fib, vm, &matching_address, mask_len);
+ }
+ }));
+
+ return 0;
+}
+
+/*?
+ * Show FIB6/route entries
+ *
+ * @cliexpar
+ * @cliexstart{show ip fib}
+ * Display the IPv6 FIB.
+ * This command will run for a long time when the FIBs comprise millions of entries.
+ * See 'show ip fib'
+ * @cliexend
+ ?*/
+VLIB_CLI_COMMAND (ip6_show_fib_command, static) = {
+ .path = "show ip6 fib",
+ .short_help = "show ip6 fib [summary] [table <n>] [<ip6-addr>] [verboase]",
+ .function = ip6_show_fib,
+};