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-rw-r--r--src/plugins/lisp/lisp-gpe/lisp_gpe_adjacency.c604
1 files changed, 604 insertions, 0 deletions
diff --git a/src/plugins/lisp/lisp-gpe/lisp_gpe_adjacency.c b/src/plugins/lisp/lisp-gpe/lisp_gpe_adjacency.c
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+++ b/src/plugins/lisp/lisp-gpe/lisp_gpe_adjacency.c
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+/*
+ * 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.
+ */
+/**
+ * @file
+ * @brief Common utility functions for IPv4, IPv6 and L2 LISP-GPE adjacencys.
+ *
+ */
+
+#include <vnet/dpo/load_balance.h>
+#include <lisp/lisp-cp/control.h>
+#include <lisp/lisp-cp/lisp_types.h>
+#include <lisp/lisp-gpe/lisp_gpe_sub_interface.h>
+#include <lisp/lisp-gpe/lisp_gpe_adjacency.h>
+#include <lisp/lisp-gpe/lisp_gpe_tunnel.h>
+#include <vnet/fib/fib_entry.h>
+#include <vnet/adj/adj_midchain.h>
+#include <vppinfra/bihash_24_8.h>
+#include <vppinfra/bihash_template.h>
+
+/**
+ * Memory pool of all adjacencies
+ */
+static lisp_gpe_adjacency_t *lisp_adj_pool;
+
+/**
+ * Hash table of all adjacencies. key:{nh, itf}
+ * We never have an all zeros address since the interfaces are multi-access,
+ * therefore there is no ambiguity between a v4 and v6 next-hop, so we don't
+ * need to add the protocol to the key.
+ */
+static
+BVT (clib_bihash)
+ lisp_adj_db;
+
+#define LISP_ADJ_SET_KEY(_key, _itf, _nh) \
+{ \
+ _key.key[0] = ip_addr_v6((_nh)).as_u64[0]; \
+ _key.key[1] = ip_addr_v6((_nh)).as_u64[1]; \
+ _key.key[2] = (_itf); \
+}
+
+ static index_t lisp_adj_find (const ip_address_t * addr, u32 sw_if_index)
+{
+ BVT (clib_bihash_kv) kv;
+
+ LISP_ADJ_SET_KEY (kv, sw_if_index, addr);
+
+ if (BV (clib_bihash_search) (&lisp_adj_db, &kv, &kv) < 0)
+ {
+ return (INDEX_INVALID);
+ }
+ else
+ {
+ return (kv.value);
+ }
+}
+
+static void
+lisp_adj_insert (const ip_address_t * addr, u32 sw_if_index, index_t ai)
+{
+ BVT (clib_bihash_kv) kv;
+
+ LISP_ADJ_SET_KEY (kv, sw_if_index, addr);
+ kv.value = ai;
+
+ BV (clib_bihash_add_del) (&lisp_adj_db, &kv, 1);
+}
+
+static void
+lisp_adj_remove (const ip_address_t * addr, u32 sw_if_index)
+{
+ BVT (clib_bihash_kv) kv;
+
+ LISP_ADJ_SET_KEY (kv, sw_if_index, addr);
+
+ BV (clib_bihash_add_del) (&lisp_adj_db, &kv, 0);
+}
+
+static lisp_gpe_adjacency_t *
+lisp_gpe_adjacency_get_i (index_t lai)
+{
+ return (pool_elt_at_index (lisp_adj_pool, lai));
+}
+
+fib_forward_chain_type_t
+lisp_gpe_adj_get_fib_chain_type (const lisp_gpe_adjacency_t * ladj)
+{
+ switch (ip_addr_version (&ladj->remote_rloc))
+ {
+ case AF_IP4:
+ return (FIB_FORW_CHAIN_TYPE_UNICAST_IP4);
+ case AF_IP6:
+ return (FIB_FORW_CHAIN_TYPE_UNICAST_IP6);
+ default:
+ ASSERT (0);
+ break;
+ }
+ return (FIB_FORW_CHAIN_TYPE_UNICAST_IP4);
+}
+
+static void
+ip46_address_to_ip_address (const ip46_address_t * a, ip_address_t * b)
+{
+ if (ip46_address_is_ip4 (a))
+ {
+ clib_memset (b, 0, sizeof (*b));
+ ip_address_set (b, &a->ip4, AF_IP4);
+ }
+ else
+ {
+ ip_address_set (b, &a->ip6, AF_IP6);
+ }
+}
+
+/**
+ * @brief Stack the tunnel's midchain on the IP forwarding chain of the via
+ */
+static void
+lisp_gpe_adj_stack_one (lisp_gpe_adjacency_t * ladj, adj_index_t ai)
+{
+ const lisp_gpe_tunnel_t *lgt;
+
+ lgt = lisp_gpe_tunnel_get (ladj->tunnel_index);
+
+ adj_nbr_midchain_stack_on_fib_entry (ai,
+ lgt->fib_entry_index,
+ lisp_gpe_adj_get_fib_chain_type
+ (ladj));
+}
+
+/**
+ * @brief Call back when restacking all adjacencies on a GRE interface
+ */
+static adj_walk_rc_t
+lisp_gpe_adj_walk_cb (adj_index_t ai, void *ctx)
+{
+ lisp_gpe_adjacency_t *ladj = ctx;
+
+ lisp_gpe_adj_stack_one (ladj, ai);
+
+ return (ADJ_WALK_RC_CONTINUE);
+}
+
+static void
+lisp_gpe_adj_stack (lisp_gpe_adjacency_t * ladj)
+{
+ fib_protocol_t nh_proto;
+ ip46_address_t nh;
+
+ nh_proto = ip_address_to_46 (&ladj->remote_rloc, &nh);
+
+ /*
+ * walk all the adjacencies on th lisp interface and restack them
+ */
+ adj_nbr_walk_nh (ladj->sw_if_index,
+ nh_proto, &nh, lisp_gpe_adj_walk_cb, ladj);
+}
+
+static lisp_gpe_next_protocol_e
+lisp_gpe_adj_proto_from_vnet_link_type (vnet_link_t linkt)
+{
+ switch (linkt)
+ {
+ case VNET_LINK_IP4:
+ return (LISP_GPE_NEXT_PROTO_IP4);
+ case VNET_LINK_IP6:
+ return (LISP_GPE_NEXT_PROTO_IP6);
+ case VNET_LINK_ETHERNET:
+ return (LISP_GPE_NEXT_PROTO_ETHERNET);
+ case VNET_LINK_NSH:
+ return (LISP_GPE_NEXT_PROTO_NSH);
+ default:
+ ASSERT (0);
+ }
+ return (LISP_GPE_NEXT_PROTO_IP4);
+}
+
+#define is_v4_packet(_h) ((*(u8*) _h) & 0xF0) == 0x40
+
+static lisp_afi_e
+lisp_afi_from_vnet_link_type (vnet_link_t link)
+{
+ switch (link)
+ {
+ case VNET_LINK_IP4:
+ return LISP_AFI_IP;
+ case VNET_LINK_IP6:
+ return LISP_AFI_IP6;
+ case VNET_LINK_ETHERNET:
+ return LISP_AFI_MAC;
+ default:
+ return LISP_AFI_NO_ADDR;
+ }
+}
+
+static void
+lisp_gpe_increment_stats_counters (lisp_cp_main_t * lcm,
+ const ip_adjacency_t * adj,
+ vlib_buffer_t * b)
+{
+ lisp_gpe_main_t *lgm = vnet_lisp_gpe_get_main ();
+ lisp_gpe_adjacency_t *ladj;
+ ip_address_t rloc;
+ index_t lai;
+ u32 si, di;
+ gid_address_t src, dst;
+ uword *feip;
+
+ ip46_address_to_ip_address (&adj->sub_type.nbr.next_hop, &rloc);
+ si = vnet_buffer (b)->sw_if_index[VLIB_TX];
+ lai = lisp_adj_find (&rloc, si);
+ ASSERT (INDEX_INVALID != lai);
+
+ ladj = pool_elt_at_index (lisp_adj_pool, lai);
+
+ u8 *lisp_data = (u8 *) vlib_buffer_get_current (b);
+
+ /* skip IP header */
+ if (is_v4_packet (lisp_data))
+ lisp_data += sizeof (ip4_header_t);
+ else
+ lisp_data += sizeof (ip6_header_t);
+
+ /* skip UDP header */
+ lisp_data += sizeof (udp_header_t);
+ // TODO: skip TCP?
+
+ /* skip LISP GPE header */
+ lisp_data += sizeof (lisp_gpe_header_t);
+
+ i16 saved_current_data = b->current_data;
+ b->current_data = lisp_data - b->data;
+
+ lisp_afi_e afi = lisp_afi_from_vnet_link_type (adj->ia_link);
+ get_src_and_dst_eids_from_buffer (lcm, b, &src, &dst, afi);
+ b->current_data = saved_current_data;
+ di = gid_dictionary_sd_lookup (&lcm->mapping_index_by_gid, &dst, &src);
+ if (PREDICT_FALSE (~0 == di))
+ {
+ clib_warning ("dst mapping not found (%U, %U)", format_gid_address,
+ &src, format_gid_address, &dst);
+ return;
+ }
+
+ feip = hash_get (lcm->fwd_entry_by_mapping_index, di);
+ if (PREDICT_FALSE (!feip))
+ return;
+
+ lisp_stats_key_t key;
+ clib_memset (&key, 0, sizeof (key));
+ key.fwd_entry_index = feip[0];
+ key.tunnel_index = ladj->tunnel_index;
+
+ uword *p = hash_get_mem (lgm->lisp_stats_index_by_key, &key);
+ ALWAYS_ASSERT (p);
+
+ /* compute payload length starting after GPE */
+ u32 bytes = b->current_length - (lisp_data - b->data - b->current_data);
+ vlib_increment_combined_counter (&lgm->counters, vlib_get_thread_index (),
+ p[0], 1, bytes);
+}
+
+static void
+lisp_gpe_fixup (vlib_main_t * vm,
+ const ip_adjacency_t * adj,
+ vlib_buffer_t * b, const void *data)
+{
+ lisp_cp_main_t *lcm = vnet_lisp_cp_get_main ();
+
+ if (lcm->flags & LISP_FLAG_STATS_ENABLED)
+ lisp_gpe_increment_stats_counters (lcm, adj, b);
+
+ /* Fixup the checksum and len fields in the LISP tunnel encap
+ * that was applied at the midchain node */
+ ip_udp_fixup_one (vm, b, is_v4_packet (vlib_buffer_get_current (b)));
+}
+
+/**
+ * @brief The LISP-GPE interface registered function to update, i.e.
+ * provide an rewrite string for, an adjacency.
+ */
+void
+lisp_gpe_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, adj_index_t ai)
+{
+ const lisp_gpe_tunnel_t *lgt;
+ lisp_gpe_adjacency_t *ladj;
+ ip_adjacency_t *adj;
+ ip_address_t rloc;
+ vnet_link_t linkt;
+ adj_flags_t af;
+ index_t lai;
+
+ adj = adj_get (ai);
+ ip46_address_to_ip_address (&adj->sub_type.nbr.next_hop, &rloc);
+
+ /*
+ * find an existing or create a new adj
+ */
+ lai = lisp_adj_find (&rloc, sw_if_index);
+
+ ASSERT (INDEX_INVALID != lai);
+
+ ladj = pool_elt_at_index (lisp_adj_pool, lai);
+ lgt = lisp_gpe_tunnel_get (ladj->tunnel_index);
+ linkt = adj_get_link_type (ai);
+ af = ADJ_FLAG_MIDCHAIN_IP_STACK;
+ if (VNET_LINK_ETHERNET == linkt)
+ af |= ADJ_FLAG_MIDCHAIN_NO_COUNT;
+
+ adj_nbr_midchain_update_rewrite
+ (ai, lisp_gpe_fixup, NULL, af,
+ lisp_gpe_tunnel_build_rewrite (lgt, ladj,
+ lisp_gpe_adj_proto_from_vnet_link_type
+ (linkt)));
+
+ lisp_gpe_adj_stack_one (ladj, ai);
+}
+
+u8 *
+lisp_gpe_build_rewrite (vnet_main_t * vnm,
+ u32 sw_if_index,
+ vnet_link_t link_type, const void *dst_address)
+{
+ ASSERT (0);
+ return (NULL);
+}
+
+index_t
+lisp_gpe_adjacency_find_or_create_and_lock (const locator_pair_t * pair,
+ u32 overlay_table_id, u32 vni)
+{
+ const lisp_gpe_sub_interface_t *l3s;
+ const lisp_gpe_tunnel_t *lgt;
+ lisp_gpe_adjacency_t *ladj;
+ index_t lai, l3si;
+
+ /*
+ * first find the L3 sub-interface that corresponds to the loacl-rloc and vni
+ */
+ l3si = lisp_gpe_sub_interface_find_or_create_and_lock (&pair->lcl_loc,
+ overlay_table_id,
+ vni);
+ l3s = lisp_gpe_sub_interface_get (l3si);
+
+ /*
+ * find an existing or create a new adj
+ */
+ lai = lisp_adj_find (&pair->rmt_loc, l3s->sw_if_index);
+
+ if (INDEX_INVALID == lai)
+ {
+
+ pool_get (lisp_adj_pool, ladj);
+ clib_memset (ladj, 0, sizeof (*ladj));
+ lai = (ladj - lisp_adj_pool);
+
+ ip_address_copy (&ladj->remote_rloc, &pair->rmt_loc);
+ ladj->vni = vni;
+ /* transfer the lock to the adj */
+ ladj->lisp_l3_sub_index = l3si;
+ ladj->sw_if_index = l3s->sw_if_index;
+
+ /* if vni is non-default */
+ if (ladj->vni)
+ ladj->flags = LISP_GPE_FLAGS_I;
+
+ /* work in lisp-gpe not legacy mode */
+ ladj->flags |= LISP_GPE_FLAGS_P;
+
+ /*
+ * find the tunnel that will provide the underlying transport
+ * and hence the rewrite.
+ * The RLOC FIB index is default table - always.
+ */
+ ladj->tunnel_index = lisp_gpe_tunnel_find_or_create_and_lock (pair, 0);
+
+ lgt = lisp_gpe_tunnel_get (ladj->tunnel_index);
+
+ /*
+ * become of child of the RLOC FIB entry so we are updated when
+ * its reachability changes, allowing us to re-stack the midcahins
+ */
+ ladj->fib_entry_child_index = fib_entry_child_add (lgt->fib_entry_index,
+ FIB_NODE_TYPE_LISP_ADJ,
+ lai);
+
+ lisp_adj_insert (&ladj->remote_rloc, ladj->sw_if_index, lai);
+ }
+ else
+ {
+ /* unlock the interface from the find. */
+ lisp_gpe_sub_interface_unlock (l3si);
+ ladj = lisp_gpe_adjacency_get_i (lai);
+ }
+
+ ladj->locks++;
+
+ return (lai);
+}
+
+/**
+ * @brief Get a pointer to a tunnel from a pointer to a FIB node
+ */
+static lisp_gpe_adjacency_t *
+lisp_gpe_adjacency_from_fib_node (const fib_node_t * node)
+{
+ return ((lisp_gpe_adjacency_t *)
+ ((char *) node -
+ STRUCT_OFFSET_OF (lisp_gpe_adjacency_t, fib_node)));
+}
+
+static void
+lisp_gpe_adjacency_last_lock_gone (lisp_gpe_adjacency_t * ladj)
+{
+ const lisp_gpe_tunnel_t *lgt;
+
+ /*
+ * no children so we are not counting locks. no-op.
+ * at least not counting
+ */
+ lisp_adj_remove (&ladj->remote_rloc, ladj->sw_if_index);
+
+ /*
+ * unlock the resources this adj holds
+ */
+ lgt = lisp_gpe_tunnel_get (ladj->tunnel_index);
+
+ fib_entry_child_remove (lgt->fib_entry_index, ladj->fib_entry_child_index);
+
+ lisp_gpe_tunnel_unlock (ladj->tunnel_index);
+ lisp_gpe_sub_interface_unlock (ladj->lisp_l3_sub_index);
+
+ pool_put (lisp_adj_pool, ladj);
+}
+
+void
+lisp_gpe_adjacency_unlock (index_t lai)
+{
+ lisp_gpe_adjacency_t *ladj;
+
+ ladj = lisp_gpe_adjacency_get_i (lai);
+
+ ladj->locks--;
+
+ if (0 == ladj->locks)
+ {
+ lisp_gpe_adjacency_last_lock_gone (ladj);
+ }
+}
+
+const lisp_gpe_adjacency_t *
+lisp_gpe_adjacency_get (index_t lai)
+{
+ return (lisp_gpe_adjacency_get_i (lai));
+}
+
+
+/**
+ * @brief LISP GPE tunnel back walk
+ *
+ * The FIB entry through which this tunnel resolves has been updated.
+ * re-stack the midchain on the new forwarding.
+ */
+static fib_node_back_walk_rc_t
+lisp_gpe_adjacency_back_walk (fib_node_t * node,
+ fib_node_back_walk_ctx_t * ctx)
+{
+ lisp_gpe_adj_stack (lisp_gpe_adjacency_from_fib_node (node));
+
+ return (FIB_NODE_BACK_WALK_CONTINUE);
+}
+
+static fib_node_t *
+lisp_gpe_adjacency_get_fib_node (fib_node_index_t index)
+{
+ lisp_gpe_adjacency_t *ladj;
+
+ ladj = pool_elt_at_index (lisp_adj_pool, index);
+ return (&ladj->fib_node);
+}
+
+static void
+lisp_gpe_adjacency_last_fib_lock_gone (fib_node_t * node)
+{
+ lisp_gpe_adjacency_last_lock_gone (lisp_gpe_adjacency_from_fib_node (node));
+}
+
+const static fib_node_vft_t lisp_gpe_tuennel_vft = {
+ .fnv_get = lisp_gpe_adjacency_get_fib_node,
+ .fnv_back_walk = lisp_gpe_adjacency_back_walk,
+ .fnv_last_lock = lisp_gpe_adjacency_last_fib_lock_gone,
+};
+
+u8 *
+format_lisp_gpe_adjacency (u8 * s, va_list * args)
+{
+ lisp_gpe_adjacency_t *ladj = va_arg (*args, lisp_gpe_adjacency_t *);
+ lisp_gpe_adjacency_format_flags_t flags =
+ va_arg (*args, lisp_gpe_adjacency_format_flags_t);
+
+ if (flags & LISP_GPE_ADJ_FORMAT_FLAG_DETAIL)
+ {
+ s =
+ format (s, "index %d locks:%d\n", ladj - lisp_adj_pool, ladj->locks);
+ }
+
+ s = format (s, " vni: %d,", ladj->vni);
+ s = format (s, " remote-RLOC: %U,", format_ip_address, &ladj->remote_rloc);
+
+ if (flags & LISP_GPE_ADJ_FORMAT_FLAG_DETAIL)
+ {
+ s = format (s, " %U\n",
+ format_lisp_gpe_sub_interface,
+ lisp_gpe_sub_interface_get (ladj->lisp_l3_sub_index));
+ s = format (s, " %U\n",
+ format_lisp_gpe_tunnel,
+ lisp_gpe_tunnel_get (ladj->tunnel_index));
+ }
+ else
+ {
+ s = format (s, " LISP L3 sub-interface index: %d,",
+ ladj->lisp_l3_sub_index);
+ s = format (s, " LISP tunnel index: %d", ladj->tunnel_index);
+ }
+
+
+ return (s);
+}
+
+static clib_error_t *
+lisp_gpe_adjacency_show (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ lisp_gpe_adjacency_t *ladj;
+ index_t index;
+
+ if (pool_elts (lisp_adj_pool) == 0)
+ vlib_cli_output (vm, "No lisp-gpe Adjacencies");
+
+ if (unformat (input, "%d", &index))
+ {
+ ladj = lisp_gpe_adjacency_get_i (index);
+ vlib_cli_output (vm, "%U", format_lisp_gpe_adjacency, ladj,
+ LISP_GPE_ADJ_FORMAT_FLAG_DETAIL);
+ }
+ else
+ {
+ /* *INDENT-OFF* */
+ pool_foreach (ladj, lisp_adj_pool,
+ ({
+ vlib_cli_output (vm, "[%d] %U\n",
+ ladj - lisp_adj_pool,
+ format_lisp_gpe_adjacency, ladj,
+ LISP_GPE_ADJ_FORMAT_FLAG_NONE);
+ }));
+ /* *INDENT-ON* */
+ }
+
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_lisp_gpe_tunnel_command, static) =
+{
+ .path = "show gpe adjacency",
+ .function = lisp_gpe_adjacency_show,
+};
+/* *INDENT-ON* */
+
+#define LISP_ADJ_NBR_DEFAULT_HASH_NUM_BUCKETS (256)
+#define LISP_ADJ_NBR_DEFAULT_HASH_MEMORY_SIZE (1<<20)
+
+static clib_error_t *
+lisp_gpe_adj_module_init (vlib_main_t * vm)
+{
+ BV (clib_bihash_init) (&lisp_adj_db,
+ "Adjacency Neighbour table",
+ LISP_ADJ_NBR_DEFAULT_HASH_NUM_BUCKETS,
+ LISP_ADJ_NBR_DEFAULT_HASH_MEMORY_SIZE);
+
+ fib_node_register_type (FIB_NODE_TYPE_LISP_ADJ, &lisp_gpe_tuennel_vft);
+ return (NULL);
+}
+
+VLIB_INIT_FUNCTION (lisp_gpe_adj_module_init);
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */