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-rw-r--r--zebra/zebra_srv6.c425
1 files changed, 425 insertions, 0 deletions
diff --git a/zebra/zebra_srv6.c b/zebra/zebra_srv6.c
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+++ b/zebra/zebra_srv6.c
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Zebra SRv6 definitions
+ * Copyright (C) 2020 Hiroki Shirokura, LINE Corporation
+ * Copyright (C) 2020 Masakazu Asama
+ */
+
+#include <zebra.h>
+
+#include "network.h"
+#include "prefix.h"
+#include "stream.h"
+#include "srv6.h"
+#include "zebra/debug.h"
+#include "zebra/zapi_msg.h"
+#include "zebra/zserv.h"
+#include "zebra/zebra_router.h"
+#include "zebra/zebra_srv6.h"
+#include "zebra/zebra_errors.h"
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+
+
+DEFINE_MGROUP(SRV6_MGR, "SRv6 Manager");
+DEFINE_MTYPE_STATIC(SRV6_MGR, SRV6M_CHUNK, "SRv6 Manager Chunk");
+
+/* define hooks for the basic API, so that it can be specialized or served
+ * externally
+ */
+
+DEFINE_HOOK(srv6_manager_client_connect,
+ (struct zserv *client, vrf_id_t vrf_id),
+ (client, vrf_id));
+DEFINE_HOOK(srv6_manager_client_disconnect,
+ (struct zserv *client), (client));
+DEFINE_HOOK(srv6_manager_get_chunk,
+ (struct srv6_locator **loc,
+ struct zserv *client,
+ const char *locator_name,
+ vrf_id_t vrf_id),
+ (loc, client, locator_name, vrf_id));
+DEFINE_HOOK(srv6_manager_release_chunk,
+ (struct zserv *client,
+ const char *locator_name,
+ vrf_id_t vrf_id),
+ (client, locator_name, vrf_id));
+
+/* define wrappers to be called in zapi_msg.c (as hooks must be called in
+ * source file where they were defined)
+ */
+
+void srv6_manager_client_connect_call(struct zserv *client, vrf_id_t vrf_id)
+{
+ hook_call(srv6_manager_client_connect, client, vrf_id);
+}
+
+void srv6_manager_get_locator_chunk_call(struct srv6_locator **loc,
+ struct zserv *client,
+ const char *locator_name,
+ vrf_id_t vrf_id)
+{
+ hook_call(srv6_manager_get_chunk, loc, client, locator_name, vrf_id);
+}
+
+void srv6_manager_release_locator_chunk_call(struct zserv *client,
+ const char *locator_name,
+ vrf_id_t vrf_id)
+{
+ hook_call(srv6_manager_release_chunk, client, locator_name, vrf_id);
+}
+
+int srv6_manager_client_disconnect_cb(struct zserv *client)
+{
+ hook_call(srv6_manager_client_disconnect, client);
+ return 0;
+}
+
+static int zebra_srv6_cleanup(struct zserv *client)
+{
+ return 0;
+}
+
+void zebra_srv6_locator_add(struct srv6_locator *locator)
+{
+ struct zebra_srv6 *srv6 = zebra_srv6_get_default();
+ struct srv6_locator *tmp;
+ struct listnode *node;
+ struct zserv *client;
+
+ tmp = zebra_srv6_locator_lookup(locator->name);
+ if (!tmp)
+ listnode_add(srv6->locators, locator);
+
+ /*
+ * Notify new locator info to zclients.
+ *
+ * The srv6 locators and their prefixes are managed by zserv(zebra).
+ * And an actual configuration the srv6 sid in the srv6 locator is done
+ * by zclient(bgpd, isisd, etc). The configuration of each locator
+ * allocation and specify it by zserv and zclient should be
+ * asynchronous. For that, zclient should be received the event via
+ * ZAPI when a srv6 locator is added on zebra.
+ * Basically, in SRv6, adding/removing SRv6 locators is performed less
+ * frequently than adding rib entries, so a broad to all zclients will
+ * not degrade the overall performance of FRRouting.
+ */
+ for (ALL_LIST_ELEMENTS_RO(zrouter.client_list, node, client))
+ zsend_zebra_srv6_locator_add(client, locator);
+}
+
+void zebra_srv6_locator_delete(struct srv6_locator *locator)
+{
+ struct listnode *n;
+ struct srv6_locator_chunk *c;
+ struct zebra_srv6 *srv6 = zebra_srv6_get_default();
+ struct zserv *client;
+
+ /*
+ * Notify deleted locator info to zclients if needed.
+ *
+ * zclient(bgpd,isisd,etc) allocates a sid from srv6 locator chunk and
+ * uses it for its own purpose. For example, in the case of BGP L3VPN,
+ * the SID assigned to vpn unicast rib will be given.
+ * And when the locator is deleted by zserv(zebra), those SIDs need to
+ * be withdrawn. The zclient must initiate the withdrawal of the SIDs
+ * by ZEBRA_SRV6_LOCATOR_DELETE, and this notification is sent to the
+ * owner of each chunk.
+ */
+ for (ALL_LIST_ELEMENTS_RO((struct list *)locator->chunks, n, c)) {
+ if (c->proto == ZEBRA_ROUTE_SYSTEM)
+ continue;
+ client = zserv_find_client(c->proto, c->instance);
+ if (!client) {
+ zlog_warn(
+ "%s: Not found zclient(proto=%u, instance=%u).",
+ __func__, c->proto, c->instance);
+ continue;
+ }
+ zsend_zebra_srv6_locator_delete(client, locator);
+ }
+
+ listnode_delete(srv6->locators, locator);
+ srv6_locator_free(locator);
+}
+
+struct srv6_locator *zebra_srv6_locator_lookup(const char *name)
+{
+ struct zebra_srv6 *srv6 = zebra_srv6_get_default();
+ struct srv6_locator *locator;
+ struct listnode *node;
+
+ for (ALL_LIST_ELEMENTS_RO(srv6->locators, node, locator))
+ if (!strncmp(name, locator->name, SRV6_LOCNAME_SIZE))
+ return locator;
+ return NULL;
+}
+
+void zebra_notify_srv6_locator_add(struct srv6_locator *locator)
+{
+ struct listnode *node;
+ struct zserv *client;
+
+ /*
+ * Notify new locator info to zclients.
+ *
+ * The srv6 locators and their prefixes are managed by zserv(zebra).
+ * And an actual configuration the srv6 sid in the srv6 locator is done
+ * by zclient(bgpd, isisd, etc). The configuration of each locator
+ * allocation and specify it by zserv and zclient should be
+ * asynchronous. For that, zclient should be received the event via
+ * ZAPI when a srv6 locator is added on zebra.
+ * Basically, in SRv6, adding/removing SRv6 locators is performed less
+ * frequently than adding rib entries, so a broad to all zclients will
+ * not degrade the overall performance of FRRouting.
+ */
+ for (ALL_LIST_ELEMENTS_RO(zrouter.client_list, node, client))
+ zsend_zebra_srv6_locator_add(client, locator);
+}
+
+void zebra_notify_srv6_locator_delete(struct srv6_locator *locator)
+{
+ struct listnode *n;
+ struct srv6_locator_chunk *c;
+ struct zserv *client;
+
+ /*
+ * Notify deleted locator info to zclients if needed.
+ *
+ * zclient(bgpd,isisd,etc) allocates a sid from srv6 locator chunk and
+ * uses it for its own purpose. For example, in the case of BGP L3VPN,
+ * the SID assigned to vpn unicast rib will be given.
+ * And when the locator is deleted by zserv(zebra), those SIDs need to
+ * be withdrawn. The zclient must initiate the withdrawal of the SIDs
+ * by ZEBRA_SRV6_LOCATOR_DELETE, and this notification is sent to the
+ * owner of each chunk.
+ */
+ for (ALL_LIST_ELEMENTS_RO((struct list *)locator->chunks, n, c)) {
+ if (c->proto == ZEBRA_ROUTE_SYSTEM)
+ continue;
+ client = zserv_find_client(c->proto, c->instance);
+ if (!client) {
+ zlog_warn("Not found zclient(proto=%u, instance=%u).",
+ c->proto, c->instance);
+ continue;
+ }
+ zsend_zebra_srv6_locator_delete(client, locator);
+ }
+}
+
+struct zebra_srv6 *zebra_srv6_get_default(void)
+{
+ static struct zebra_srv6 srv6;
+ static bool first_execution = true;
+
+ if (first_execution) {
+ first_execution = false;
+ srv6.locators = list_new();
+ }
+ return &srv6;
+}
+
+/**
+ * Core function, assigns srv6-locator 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
+ * @param session_id SessionID of client
+ * @param name Name of SRv6-locator
+ * @return Pointer to the assigned srv6-locator chunk,
+ * or NULL if the request could not be satisfied
+ */
+static struct srv6_locator *
+assign_srv6_locator_chunk(uint8_t proto,
+ uint16_t instance,
+ uint32_t session_id,
+ const char *locator_name)
+{
+ bool chunk_found = false;
+ struct listnode *node = NULL;
+ struct srv6_locator *loc = NULL;
+ struct srv6_locator_chunk *chunk = NULL;
+
+ loc = zebra_srv6_locator_lookup(locator_name);
+ if (!loc) {
+ zlog_info("%s: locator %s was not found",
+ __func__, locator_name);
+ return NULL;
+ }
+
+ for (ALL_LIST_ELEMENTS_RO((struct list *)loc->chunks, node, chunk)) {
+ if (chunk->proto != NO_PROTO && chunk->proto != proto)
+ continue;
+ chunk_found = true;
+ break;
+ }
+
+ if (!chunk_found) {
+ zlog_info("%s: locator is already owned", __func__);
+ return NULL;
+ }
+
+ chunk->proto = proto;
+ chunk->instance = instance;
+ chunk->session_id = session_id;
+ return loc;
+}
+
+static int zebra_srv6_manager_get_locator_chunk(struct srv6_locator **loc,
+ struct zserv *client,
+ const char *locator_name,
+ vrf_id_t vrf_id)
+{
+ int ret = 0;
+
+ *loc = assign_srv6_locator_chunk(client->proto, client->instance,
+ client->session_id, locator_name);
+
+ if (!*loc)
+ zlog_err("Unable to assign locator chunk to %s instance %u",
+ zebra_route_string(client->proto), client->instance);
+ else if (IS_ZEBRA_DEBUG_PACKET)
+ zlog_info("Assigned locator chunk %s to %s instance %u",
+ (*loc)->name, zebra_route_string(client->proto),
+ client->instance);
+
+ if (*loc && (*loc)->status_up)
+ ret = zsend_srv6_manager_get_locator_chunk_response(client,
+ vrf_id,
+ *loc);
+ return ret;
+}
+
+/**
+ * Core function, release no longer used srv6-locator chunks
+ *
+ * @param proto Daemon protocol of client, to identify the owner
+ * @param instance Instance, to identify the owner
+ * @param session_id Zclient session ID, to identify the zclient session
+ * @param locator_name SRv6-locator name, to identify the actual locator
+ * @return 0 on success, -1 otherwise
+ */
+static int release_srv6_locator_chunk(uint8_t proto, uint16_t instance,
+ uint32_t session_id,
+ const char *locator_name)
+{
+ int ret = -1;
+ struct listnode *node;
+ struct srv6_locator_chunk *chunk;
+ struct srv6_locator *loc = NULL;
+
+ loc = zebra_srv6_locator_lookup(locator_name);
+ if (!loc)
+ return -1;
+
+ if (IS_ZEBRA_DEBUG_PACKET)
+ zlog_debug("%s: Releasing srv6-locator on %s", __func__,
+ locator_name);
+
+ for (ALL_LIST_ELEMENTS_RO((struct list *)loc->chunks, node, chunk)) {
+ if (chunk->proto != proto ||
+ chunk->instance != instance ||
+ chunk->session_id != session_id)
+ continue;
+ chunk->proto = NO_PROTO;
+ chunk->instance = 0;
+ chunk->session_id = 0;
+ chunk->keep = 0;
+ ret = 0;
+ break;
+ }
+
+ if (ret != 0)
+ flog_err(EC_ZEBRA_SRV6M_UNRELEASED_LOCATOR_CHUNK,
+ "%s: SRv6 locator chunk not released", __func__);
+
+ return ret;
+}
+
+static int zebra_srv6_manager_release_locator_chunk(struct zserv *client,
+ const char *locator_name,
+ vrf_id_t vrf_id)
+{
+ if (vrf_id != VRF_DEFAULT) {
+ zlog_err("SRv6 locator doesn't support vrf");
+ return -1;
+ }
+
+ return release_srv6_locator_chunk(client->proto, client->instance,
+ client->session_id, locator_name);
+}
+
+/**
+ * Release srv6-locator chunks from a client.
+ *
+ * Called on client disconnection or reconnection. It only releases chunks
+ * with empty keep value.
+ *
+ * @param proto Daemon protocol of client, to identify the owner
+ * @param instance Instance, to identify the owner
+ * @return Number of chunks released
+ */
+int release_daemon_srv6_locator_chunks(struct zserv *client)
+{
+ int ret;
+ int count = 0;
+ struct zebra_srv6 *srv6 = zebra_srv6_get_default();
+ struct listnode *loc_node;
+ struct listnode *chunk_node;
+ struct srv6_locator *loc;
+ struct srv6_locator_chunk *chunk;
+
+ if (IS_ZEBRA_DEBUG_PACKET)
+ zlog_debug("%s: Releasing chunks for client proto %s, instance %d, session %u",
+ __func__, zebra_route_string(client->proto),
+ client->instance, client->session_id);
+
+ for (ALL_LIST_ELEMENTS_RO(srv6->locators, loc_node, loc)) {
+ for (ALL_LIST_ELEMENTS_RO(loc->chunks, chunk_node, chunk)) {
+ if (chunk->proto == client->proto &&
+ chunk->instance == client->instance &&
+ chunk->session_id == client->session_id &&
+ chunk->keep == 0) {
+ ret = release_srv6_locator_chunk(
+ chunk->proto, chunk->instance,
+ chunk->session_id, loc->name);
+ if (ret == 0)
+ count++;
+ }
+ }
+ }
+
+ if (IS_ZEBRA_DEBUG_PACKET)
+ zlog_debug("%s: Released %d srv6-locator chunks",
+ __func__, count);
+
+ return count;
+}
+
+void zebra_srv6_init(void)
+{
+ hook_register(zserv_client_close, zebra_srv6_cleanup);
+ hook_register(srv6_manager_get_chunk,
+ zebra_srv6_manager_get_locator_chunk);
+ hook_register(srv6_manager_release_chunk,
+ zebra_srv6_manager_release_locator_chunk);
+}
+
+bool zebra_srv6_is_enable(void)
+{
+ struct zebra_srv6 *srv6 = zebra_srv6_get_default();
+
+ return listcount(srv6->locators);
+}
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