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-rw-r--r--zebra/table_manager.c330
1 files changed, 330 insertions, 0 deletions
diff --git a/zebra/table_manager.c b/zebra/table_manager.c
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index 0000000..512508b
--- /dev/null
+++ b/zebra/table_manager.c
@@ -0,0 +1,330 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* zebra table Manager for routing table identifier management
+ * Copyright (C) 2018 6WIND
+ */
+
+#include "zebra.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+
+#include "lib/log.h"
+#include "lib/memory.h"
+#include "lib/table.h"
+#include "lib/network.h"
+#include "lib/stream.h"
+#include "lib/zclient.h"
+#include "lib/libfrr.h"
+#include "lib/vrf.h"
+
+#include "zebra/zserv.h"
+#include "zebra/zebra_vrf.h"
+#include "zebra/label_manager.h" /* for NO_PROTO */
+#include "zebra/table_manager.h"
+#include "zebra/zebra_errors.h"
+
+/* routing table identifiers
+ *
+ */
+#if !defined(GNU_LINUX)
+/* BSD systems
+ */
+#else
+/* Linux Systems
+ */
+#define RT_TABLE_ID_LOCAL 255
+#define RT_TABLE_ID_MAIN 254
+#define RT_TABLE_ID_DEFAULT 253
+#define RT_TABLE_ID_COMPAT 252
+#define RT_TABLE_ID_UNSPEC 0
+#endif /* !def(GNU_LINUX) */
+#define RT_TABLE_ID_UNRESERVED_MIN 1
+#define RT_TABLE_ID_UNRESERVED_MAX 0xffffffff
+
+DEFINE_MGROUP(TABLE_MGR, "Table Manager");
+DEFINE_MTYPE_STATIC(TABLE_MGR, TM_CHUNK, "Table Manager Chunk");
+DEFINE_MTYPE_STATIC(TABLE_MGR, TM_TABLE, "Table Manager Context");
+
+static void delete_table_chunk(void *val)
+{
+ XFREE(MTYPE_TM_CHUNK, val);
+}
+
+/**
+ * Init table manager
+ */
+void table_manager_enable(struct zebra_vrf *zvrf)
+{
+
+ if (zvrf->tbl_mgr)
+ return;
+ if (!vrf_is_backend_netns()
+ && strcmp(zvrf_name(zvrf), VRF_DEFAULT_NAME)) {
+ struct zebra_vrf *def = zebra_vrf_lookup_by_id(VRF_DEFAULT);
+
+ zvrf->tbl_mgr = def->tbl_mgr;
+ return;
+ }
+ zvrf->tbl_mgr = XCALLOC(MTYPE_TM_TABLE, sizeof(struct table_manager));
+ zvrf->tbl_mgr->lc_list = list_new();
+ zvrf->tbl_mgr->lc_list->del = delete_table_chunk;
+}
+
+/**
+ * Core function, assigns table chunks
+ *
+ * It first searches through the list to check if there's one available
+ * (previously released). Otherwise it creates and assigns a new one
+ *
+ * @param proto Daemon protocol of client, to identify the owner
+ * @param instance Instance, to identify the owner
+ * @para size Size of the table chunk
+ * @return Pointer to the assigned table chunk
+ */
+struct table_manager_chunk *assign_table_chunk(uint8_t proto, uint16_t instance,
+ uint32_t size,
+ struct zebra_vrf *zvrf)
+{
+ struct table_manager_chunk *tmc;
+ struct listnode *node;
+ uint32_t start;
+ bool manual_conf = false;
+
+ if (!zvrf)
+ return NULL;
+
+ /* first check if there's one available */
+ for (ALL_LIST_ELEMENTS_RO(zvrf->tbl_mgr->lc_list, node, tmc)) {
+ if (tmc->proto == NO_PROTO
+ && tmc->end - tmc->start + 1 == size) {
+ tmc->proto = proto;
+ tmc->instance = instance;
+ return tmc;
+ }
+ }
+ /* otherwise create a new one */
+ tmc = XCALLOC(MTYPE_TM_CHUNK, sizeof(struct table_manager_chunk));
+
+ if (zvrf->tbl_mgr->start || zvrf->tbl_mgr->end)
+ manual_conf = true;
+ /* table RT IDs range are [1;252] and [256;0xffffffff]
+ * - check if the requested range can be within the first range,
+ * otherwise elect second one
+ * - TODO : vrf-lites have their own table identifier.
+ * In that case, table_id should be removed from the table range.
+ */
+ if (list_isempty(zvrf->tbl_mgr->lc_list)) {
+ if (!manual_conf)
+ start = RT_TABLE_ID_UNRESERVED_MIN;
+ else
+ start = zvrf->tbl_mgr->start;
+ } else
+ start = ((struct table_manager_chunk *)listgetdata(
+ listtail(zvrf->tbl_mgr->lc_list)))
+ ->end
+ + 1;
+
+ if (!manual_conf) {
+
+#if !defined(GNU_LINUX)
+/* BSD systems
+ */
+#else
+/* Linux Systems
+ */
+ /* if not enough room space between MIN and COMPAT,
+ * then begin after LOCAL
+ */
+ if (start < RT_TABLE_ID_COMPAT
+ && (size > RT_TABLE_ID_COMPAT - RT_TABLE_ID_UNRESERVED_MIN))
+ start = RT_TABLE_ID_LOCAL + 1;
+#endif /* !def(GNU_LINUX) */
+ tmc->start = start;
+ if (RT_TABLE_ID_UNRESERVED_MAX - size + 1 < start) {
+ flog_err(EC_ZEBRA_TM_EXHAUSTED_IDS,
+ "Reached max table id. Start/Size %u/%u",
+ start, size);
+ XFREE(MTYPE_TM_CHUNK, tmc);
+ return NULL;
+ }
+ } else {
+ tmc->start = start;
+ if (zvrf->tbl_mgr->end - size + 1 < start) {
+ flog_err(EC_ZEBRA_TM_EXHAUSTED_IDS,
+ "Reached max table id. Start/Size %u/%u",
+ start, size);
+ XFREE(MTYPE_TM_CHUNK, tmc);
+ return NULL;
+ }
+ }
+ tmc->end = tmc->start + size - 1;
+ tmc->proto = proto;
+ tmc->instance = instance;
+ listnode_add(zvrf->tbl_mgr->lc_list, tmc);
+
+ return tmc;
+}
+
+/**
+ * Core function, release no longer used table chunks
+ *
+ * @param proto Daemon protocol of client, to identify the owner
+ * @param instance Instance, to identify the owner
+ * @param start First table RT ID of the chunk
+ * @param end Last table RT ID of the chunk
+ * @return 0 on success, -1 otherwise
+ */
+int release_table_chunk(uint8_t proto, uint16_t instance, uint32_t start,
+ uint32_t end, struct zebra_vrf *zvrf)
+{
+ struct listnode *node;
+ struct table_manager_chunk *tmc;
+ int ret = -1;
+ struct table_manager *tbl_mgr;
+
+ if (!zvrf)
+ return -1;
+
+ tbl_mgr = zvrf->tbl_mgr;
+ if (!tbl_mgr)
+ return ret;
+ /* check that size matches */
+ zlog_debug("Releasing table chunk: %u - %u", start, end);
+ /* find chunk and disown */
+ for (ALL_LIST_ELEMENTS_RO(tbl_mgr->lc_list, node, tmc)) {
+ if (tmc->start != start)
+ continue;
+ if (tmc->end != end)
+ continue;
+ if (tmc->proto != proto || tmc->instance != instance) {
+ flog_err(EC_ZEBRA_TM_DAEMON_MISMATCH,
+ "%s: Daemon mismatch!!", __func__);
+ continue;
+ }
+ tmc->proto = NO_PROTO;
+ tmc->instance = 0;
+ ret = 0;
+ break;
+ }
+ if (ret != 0)
+ flog_err(EC_ZEBRA_TM_UNRELEASED_CHUNK,
+ "%s: Table chunk not released!!", __func__);
+
+ return ret;
+}
+
+/**
+ * Release table chunks from a client.
+ *
+ * Called on client disconnection or reconnection. It only releases chunks
+ * with empty keep value.
+ *
+ * @param client the client to release chunks from
+ * @return Number of chunks released
+ */
+int release_daemon_table_chunks(struct zserv *client)
+{
+ uint8_t proto = client->proto;
+ uint16_t instance = client->instance;
+ struct listnode *node;
+ struct table_manager_chunk *tmc;
+ int count = 0;
+ int ret;
+ struct vrf *vrf;
+ struct zebra_vrf *zvrf;
+
+ RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) {
+ zvrf = vrf->info;
+
+ if (!zvrf)
+ continue;
+ if (!vrf_is_backend_netns() && vrf->vrf_id != VRF_DEFAULT)
+ continue;
+ for (ALL_LIST_ELEMENTS_RO(zvrf->tbl_mgr->lc_list, node, tmc)) {
+ if (tmc->proto == proto && tmc->instance == instance) {
+ ret = release_table_chunk(
+ tmc->proto, tmc->instance, tmc->start,
+ tmc->end, zvrf);
+ if (ret == 0)
+ count++;
+ }
+ }
+ }
+ zlog_debug("%s: Released %d table chunks", __func__, count);
+
+ return count;
+}
+
+static void table_range_add(struct zebra_vrf *zvrf, uint32_t start,
+ uint32_t end)
+{
+ if (!zvrf->tbl_mgr)
+ return;
+ zvrf->tbl_mgr->start = start;
+ zvrf->tbl_mgr->end = end;
+}
+
+void table_manager_disable(struct zebra_vrf *zvrf)
+{
+ if (!zvrf->tbl_mgr)
+ return;
+ if (!vrf_is_backend_netns()
+ && strcmp(zvrf_name(zvrf), VRF_DEFAULT_NAME)) {
+ zvrf->tbl_mgr = NULL;
+ return;
+ }
+ list_delete(&zvrf->tbl_mgr->lc_list);
+ XFREE(MTYPE_TM_TABLE, zvrf->tbl_mgr);
+ zvrf->tbl_mgr = NULL;
+}
+
+int table_manager_range(struct vty *vty, bool add, struct zebra_vrf *zvrf,
+ const char *start_table_str, const char *end_table_str)
+{
+ uint32_t start;
+ uint32_t end;
+
+ if (add) {
+ if (!start_table_str || !end_table_str) {
+ vty_out(vty, "%% Labels not specified\n");
+ return CMD_WARNING_CONFIG_FAILED;
+ }
+ start = atoi(start_table_str);
+ end = atoi(end_table_str);
+ if (end < start) {
+ vty_out(vty, "%% End table is less than Start table\n");
+ return CMD_WARNING_CONFIG_FAILED;
+ }
+
+#if !defined(GNU_LINUX)
+/* BSD systems
+ */
+#else
+ /* Linux Systems
+ */
+ if ((start >= RT_TABLE_ID_COMPAT && start <= RT_TABLE_ID_LOCAL)
+ || (end >= RT_TABLE_ID_COMPAT
+ && end <= RT_TABLE_ID_LOCAL)) {
+ vty_out(vty, "%% Values forbidden in range [%u;%u]\n",
+ RT_TABLE_ID_COMPAT, RT_TABLE_ID_LOCAL);
+ return CMD_WARNING_CONFIG_FAILED;
+ }
+ if (start < RT_TABLE_ID_COMPAT && end > RT_TABLE_ID_LOCAL) {
+ vty_out(vty,
+ "%% Range overlaps range [%u;%u] forbidden\n",
+ RT_TABLE_ID_COMPAT, RT_TABLE_ID_LOCAL);
+ return CMD_WARNING_CONFIG_FAILED;
+ }
+#endif
+ if (zvrf->tbl_mgr
+ && ((zvrf->tbl_mgr->start && zvrf->tbl_mgr->start != start)
+ || (zvrf->tbl_mgr->end && zvrf->tbl_mgr->end != end))) {
+ vty_out(vty,
+ "%% New range will be taken into account at restart\n");
+ }
+ table_range_add(zvrf, start, end);
+ } else
+ table_range_add(zvrf, 0, 0);
+ return CMD_SUCCESS;
+}