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frr/bfdd/config.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*********************************************************************
* Copyright 2017-2018 Network Device Education Foundation, Inc. ("NetDEF")
*
* config.c: implements the BFD daemon configuration handling.
*
* Authors
* -------
* Rafael Zalamena <rzalamena@opensourcerouting.org>
*/
#include <zebra.h>
#include <string.h>
#include "lib/json.h"
#include "bfd.h"
DEFINE_MTYPE_STATIC(BFDD, BFDD_LABEL, "long-lived label memory");
/*
* Definitions
*/
enum peer_list_type {
PLT_IPV4,
PLT_IPV6,
PLT_LABEL,
};
/*
* Prototypes
*/
static int parse_config_json(struct json_object *jo, bpc_handle h, void *arg);
static int parse_list(struct json_object *jo, enum peer_list_type plt,
bpc_handle h, void *arg);
static int parse_peer_config(struct json_object *jo, struct bfd_peer_cfg *bpc);
static int parse_peer_label_config(struct json_object *jo,
struct bfd_peer_cfg *bpc);
static int config_add(struct bfd_peer_cfg *bpc, void *arg);
static int config_del(struct bfd_peer_cfg *bpc, void *arg);
static int json_object_add_peer(struct json_object *jo, struct bfd_session *bs);
/*
* Implementation
*/
static int config_add(struct bfd_peer_cfg *bpc,
void *arg __attribute__((unused)))
{
return ptm_bfd_sess_new(bpc) == NULL;
}
static int config_del(struct bfd_peer_cfg *bpc,
void *arg __attribute__((unused)))
{
return ptm_bfd_sess_del(bpc) != 0;
}
static int parse_config_json(struct json_object *jo, bpc_handle h, void *arg)
{
const char *key, *sval;
struct json_object *jo_val;
struct json_object_iterator joi, join;
int error = 0;
JSON_FOREACH (jo, joi, join) {
key = json_object_iter_peek_name(&joi);
jo_val = json_object_iter_peek_value(&joi);
if (strcmp(key, "ipv4") == 0) {
error += parse_list(jo_val, PLT_IPV4, h, arg);
} else if (strcmp(key, "ipv6") == 0) {
error += parse_list(jo_val, PLT_IPV6, h, arg);
} else if (strcmp(key, "label") == 0) {
error += parse_list(jo_val, PLT_LABEL, h, arg);
} else {
sval = json_object_get_string(jo_val);
zlog_warn("%s:%d invalid configuration: %s", __func__,
__LINE__, sval);
error++;
}
}
/*
* Our callers never call free() on json_object and only expect
* the return value, so lets free() it here.
*/
json_object_put(jo);
return error;
}
int parse_config(const char *fname)
{
struct json_object *jo;
jo = json_object_from_file(fname);
if (jo == NULL)
return -1;
return parse_config_json(jo, config_add, NULL);
}
static int parse_list(struct json_object *jo, enum peer_list_type plt,
bpc_handle h, void *arg)
{
struct json_object *jo_val;
struct bfd_peer_cfg bpc;
int allen, idx;
int error = 0, result;
allen = json_object_array_length(jo);
for (idx = 0; idx < allen; idx++) {
jo_val = json_object_array_get_idx(jo, idx);
/* Set defaults. */
memset(&bpc, 0, sizeof(bpc));
bpc.bpc_detectmultiplier = BFD_DEFDETECTMULT;
bpc.bpc_recvinterval = BFD_DEFREQUIREDMINRX;
bpc.bpc_txinterval = BFD_DEFDESIREDMINTX;
bpc.bpc_echorecvinterval = BFD_DEF_REQ_MIN_ECHO_RX;
bpc.bpc_echotxinterval = BFD_DEF_DES_MIN_ECHO_TX;
switch (plt) {
case PLT_IPV4:
zlog_debug("ipv4 peers %d:", allen);
bpc.bpc_ipv4 = true;
break;
case PLT_IPV6:
zlog_debug("ipv6 peers %d:", allen);
bpc.bpc_ipv4 = false;
break;
case PLT_LABEL:
zlog_debug("label peers %d:", allen);
if (parse_peer_label_config(jo_val, &bpc) != 0) {
error++;
continue;
}
break;
default:
error++;
zlog_err("%s:%d: unsupported peer type", __func__,
__LINE__);
break;
}
result = parse_peer_config(jo_val, &bpc);
error += result;
if (result == 0)
error += (h(&bpc, arg) != 0);
}
return error;
}
static int parse_peer_config(struct json_object *jo, struct bfd_peer_cfg *bpc)
{
const char *key, *sval;
struct json_object *jo_val;
struct json_object_iterator joi, join;
int family_type = (bpc->bpc_ipv4) ? AF_INET : AF_INET6;
int error = 0;
zlog_debug(" peer: %s", bpc->bpc_ipv4 ? "ipv4" : "ipv6");
JSON_FOREACH (jo, joi, join) {
key = json_object_iter_peek_name(&joi);
jo_val = json_object_iter_peek_value(&joi);
if (strcmp(key, "multihop") == 0) {
bpc->bpc_mhop = json_object_get_boolean(jo_val);
zlog_debug(" multihop: %s",
bpc->bpc_mhop ? "true" : "false");
} else if (strcmp(key, "peer-address") == 0) {
sval = json_object_get_string(jo_val);
if (strtosa(sval, &bpc->bpc_peer) != 0
|| bpc->bpc_peer.sa_sin.sin_family != family_type) {
zlog_debug(
"%s:%d failed to parse peer-address '%s'",
__func__, __LINE__, sval);
error++;
}
zlog_debug(" peer-address: %s", sval);
} else if (strcmp(key, "local-address") == 0) {
sval = json_object_get_string(jo_val);
if (strtosa(sval, &bpc->bpc_local) != 0
|| bpc->bpc_local.sa_sin.sin_family
!= family_type) {
zlog_debug(
"%s:%d failed to parse local-address '%s'",
__func__, __LINE__, sval);
error++;
}
zlog_debug(" local-address: %s", sval);
} else if (strcmp(key, "local-interface") == 0) {
bpc->bpc_has_localif = true;
sval = json_object_get_string(jo_val);
if (strlcpy(bpc->bpc_localif, sval,
sizeof(bpc->bpc_localif))
> sizeof(bpc->bpc_localif)) {
zlog_debug(
" local-interface: %s (truncated)",
sval);
error++;
} else {
zlog_debug(" local-interface: %s", sval);
}
} else if (strcmp(key, "vrf-name") == 0) {
bpc->bpc_has_vrfname = true;
sval = json_object_get_string(jo_val);
if (strlcpy(bpc->bpc_vrfname, sval,
sizeof(bpc->bpc_vrfname))
> sizeof(bpc->bpc_vrfname)) {
zlog_debug(" vrf-name: %s (truncated)",
sval);
error++;
} else {
zlog_debug(" vrf-name: %s", sval);
}
} else if (strcmp(key, "detect-multiplier") == 0) {
bpc->bpc_detectmultiplier =
json_object_get_int64(jo_val);
bpc->bpc_has_detectmultiplier = true;
zlog_debug(" detect-multiplier: %u",
bpc->bpc_detectmultiplier);
} else if (strcmp(key, "receive-interval") == 0) {
bpc->bpc_recvinterval = json_object_get_int64(jo_val);
bpc->bpc_has_recvinterval = true;
zlog_debug(" receive-interval: %" PRIu64,
bpc->bpc_recvinterval);
} else if (strcmp(key, "transmit-interval") == 0) {
bpc->bpc_txinterval = json_object_get_int64(jo_val);
bpc->bpc_has_txinterval = true;
zlog_debug(" transmit-interval: %" PRIu64,
bpc->bpc_txinterval);
} else if (strcmp(key, "echo-receive-interval") == 0) {
bpc->bpc_echorecvinterval = json_object_get_int64(jo_val);
bpc->bpc_has_echorecvinterval = true;
zlog_debug(" echo-receive-interval: %" PRIu64,
bpc->bpc_echorecvinterval);
} else if (strcmp(key, "echo-transmit-interval") == 0) {
bpc->bpc_echotxinterval = json_object_get_int64(jo_val);
bpc->bpc_has_echotxinterval = true;
zlog_debug(" echo-transmit-interval: %" PRIu64,
bpc->bpc_echotxinterval);
} else if (strcmp(key, "create-only") == 0) {
bpc->bpc_createonly = json_object_get_boolean(jo_val);
zlog_debug(" create-only: %s",
bpc->bpc_createonly ? "true" : "false");
} else if (strcmp(key, "shutdown") == 0) {
bpc->bpc_shutdown = json_object_get_boolean(jo_val);
zlog_debug(" shutdown: %s",
bpc->bpc_shutdown ? "true" : "false");
} else if (strcmp(key, "echo-mode") == 0) {
bpc->bpc_echo = json_object_get_boolean(jo_val);
zlog_debug(" echo-mode: %s",
bpc->bpc_echo ? "true" : "false");
} else if (strcmp(key, "label") == 0) {
bpc->bpc_has_label = true;
sval = json_object_get_string(jo_val);
if (strlcpy(bpc->bpc_label, sval,
sizeof(bpc->bpc_label))
> sizeof(bpc->bpc_label)) {
zlog_debug(" label: %s (truncated)",
sval);
error++;
} else {
zlog_debug(" label: %s", sval);
}
} else {
sval = json_object_get_string(jo_val);
zlog_warn("%s:%d invalid configuration: '%s: %s'",
__func__, __LINE__, key, sval);
error++;
}
}
if (bpc->bpc_peer.sa_sin.sin_family == 0) {
zlog_debug("%s:%d no peer address provided", __func__,
__LINE__);
error++;
}
return error;
}
static int parse_peer_label_config(struct json_object *jo,
struct bfd_peer_cfg *bpc)
{
struct peer_label *pl;
struct json_object *label;
const char *sval;
/* Get label and translate it to BFD daemon key. */
if (!json_object_object_get_ex(jo, "label", &label))
return 1;
sval = json_object_get_string(label);
pl = pl_find(sval);
if (pl == NULL)
return 1;
zlog_debug(" peer-label: %s", sval);
/* Translate the label into BFD address keys. */
bs_to_bpc(pl->pl_bs, bpc);
return 0;
}
/*
* Control socket JSON parsing.
*/
int config_request_add(const char *jsonstr)
{
struct json_object *jo;
jo = json_tokener_parse(jsonstr);
if (jo == NULL)
return -1;
return parse_config_json(jo, config_add, NULL);
}
int config_request_del(const char *jsonstr)
{
struct json_object *jo;
jo = json_tokener_parse(jsonstr);
if (jo == NULL)
return -1;
return parse_config_json(jo, config_del, NULL);
}
char *config_response(const char *status, const char *error)
{
struct json_object *resp, *jo;
char *jsonstr;
resp = json_object_new_object();
if (resp == NULL)
return NULL;
/* Add 'status' response key. */
jo = json_object_new_string(status);
if (jo == NULL) {
json_object_put(resp);
return NULL;
}
json_object_object_add(resp, "status", jo);
/* Add 'error' response key. */
if (error != NULL) {
jo = json_object_new_string(error);
if (jo == NULL) {
json_object_put(resp);
return NULL;
}
json_object_object_add(resp, "error", jo);
}
/* Generate JSON response. */
jsonstr = XSTRDUP(
MTYPE_BFDD_NOTIFICATION,
json_object_to_json_string_ext(resp, BFDD_JSON_CONV_OPTIONS));
json_object_put(resp);
return jsonstr;
}
char *config_notify(struct bfd_session *bs)
{
struct json_object *resp;
char *jsonstr;
time_t now;
resp = json_object_new_object();
if (resp == NULL)
return NULL;
json_object_string_add(resp, "op", BCM_NOTIFY_PEER_STATUS);
json_object_add_peer(resp, bs);
/* Add status information */
json_object_int_add(resp, "id", bs->discrs.my_discr);
json_object_int_add(resp, "remote-id", bs->discrs.my_discr);
switch (bs->ses_state) {
case PTM_BFD_UP:
json_object_string_add(resp, "state", "up");
now = monotime(NULL);
json_object_int_add(resp, "uptime", now - bs->uptime.tv_sec);
break;
case PTM_BFD_ADM_DOWN:
json_object_string_add(resp, "state", "adm-down");
break;
case PTM_BFD_DOWN:
json_object_string_add(resp, "state", "down");
now = monotime(NULL);
json_object_int_add(resp, "downtime",
now - bs->downtime.tv_sec);
break;
case PTM_BFD_INIT:
json_object_string_add(resp, "state", "init");
break;
default:
json_object_string_add(resp, "state", "unknown");
break;
}
json_object_int_add(resp, "diagnostics", bs->local_diag);
json_object_int_add(resp, "remote-diagnostics", bs->remote_diag);
/* Generate JSON response. */
jsonstr = XSTRDUP(
MTYPE_BFDD_NOTIFICATION,
json_object_to_json_string_ext(resp, BFDD_JSON_CONV_OPTIONS));
json_object_put(resp);
return jsonstr;
}
char *config_notify_config(const char *op, struct bfd_session *bs)
{
struct json_object *resp;
char *jsonstr;
resp = json_object_new_object();
if (resp == NULL)
return NULL;
json_object_string_add(resp, "op", op);
json_object_add_peer(resp, bs);
/* On peer deletion we don't need to add any additional information. */
if (strcmp(op, BCM_NOTIFY_CONFIG_DELETE) == 0)
goto skip_config;
json_object_int_add(resp, "detect-multiplier", bs->detect_mult);
json_object_int_add(resp, "receive-interval",
bs->timers.required_min_rx / 1000);
json_object_int_add(resp, "transmit-interval",
bs->timers.desired_min_tx / 1000);
json_object_int_add(resp, "echo-receive-interval",
bs->timers.required_min_echo_rx / 1000);
json_object_int_add(resp, "echo-transmit-interval",
bs->timers.desired_min_echo_tx / 1000);
json_object_int_add(resp, "remote-detect-multiplier",
bs->remote_detect_mult);
json_object_int_add(resp, "remote-receive-interval",
bs->remote_timers.required_min_rx / 1000);
json_object_int_add(resp, "remote-transmit-interval",
bs->remote_timers.desired_min_tx / 1000);
json_object_int_add(resp, "remote-echo-receive-interval",
bs->remote_timers.required_min_echo / 1000);
if (CHECK_FLAG(bs->flags, BFD_SESS_FLAG_ECHO))
json_object_boolean_true_add(resp, "echo-mode");
else
json_object_boolean_false_add(resp, "echo-mode");
if (CHECK_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN))
json_object_boolean_true_add(resp, "shutdown");
else
json_object_boolean_false_add(resp, "shutdown");
skip_config:
/* Generate JSON response. */
jsonstr = XSTRDUP(
MTYPE_BFDD_NOTIFICATION,
json_object_to_json_string_ext(resp, BFDD_JSON_CONV_OPTIONS));
json_object_put(resp);
return jsonstr;
}
int config_notify_request(struct bfd_control_socket *bcs, const char *jsonstr,
bpc_handle bh)
{
struct json_object *jo;
jo = json_tokener_parse(jsonstr);
if (jo == NULL)
return -1;
return parse_config_json(jo, bh, bcs);
}
static int json_object_add_peer(struct json_object *jo, struct bfd_session *bs)
{
char addr_buf[INET6_ADDRSTRLEN];
/* Add peer 'key' information. */
if (CHECK_FLAG(bs->flags, BFD_SESS_FLAG_IPV6))
json_object_boolean_true_add(jo, "ipv6");
else
json_object_boolean_false_add(jo, "ipv6");
if (CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH)) {
json_object_boolean_true_add(jo, "multihop");
json_object_string_add(jo, "peer-address",
inet_ntop(bs->key.family, &bs->key.peer,
addr_buf, sizeof(addr_buf)));
json_object_string_add(jo, "local-address",
inet_ntop(bs->key.family, &bs->key.local,
addr_buf, sizeof(addr_buf)));
if (bs->key.vrfname[0])
json_object_string_add(jo, "vrf-name", bs->key.vrfname);
} else {
json_object_boolean_false_add(jo, "multihop");
json_object_string_add(jo, "peer-address",
inet_ntop(bs->key.family, &bs->key.peer,
addr_buf, sizeof(addr_buf)));
if (memcmp(&bs->key.local, &zero_addr, sizeof(bs->key.local)))
json_object_string_add(
jo, "local-address",
inet_ntop(bs->key.family, &bs->key.local,
addr_buf, sizeof(addr_buf)));
if (bs->key.ifname[0])
json_object_string_add(jo, "local-interface",
bs->key.ifname);
}
if (bs->pl)
json_object_string_add(jo, "label", bs->pl->pl_label);
return 0;
}
/*
* Label handling
*/
struct peer_label *pl_find(const char *label)
{
struct peer_label *pl;
TAILQ_FOREACH (pl, &bglobal.bg_pllist, pl_entry) {
if (strcmp(pl->pl_label, label) != 0)
continue;
return pl;
}
return NULL;
}
struct peer_label *pl_new(const char *label, struct bfd_session *bs)
{
struct peer_label *pl;
pl = XCALLOC(MTYPE_BFDD_LABEL, sizeof(*pl));
if (strlcpy(pl->pl_label, label, sizeof(pl->pl_label))
> sizeof(pl->pl_label))
zlog_warn("%s:%d: label was truncated", __func__, __LINE__);
pl->pl_bs = bs;
bs->pl = pl;
TAILQ_INSERT_HEAD(&bglobal.bg_pllist, pl, pl_entry);
return pl;
}
void pl_free(struct peer_label *pl)
{
if (pl == NULL)
return;
/* Remove the pointer back. */
pl->pl_bs->pl = NULL;
TAILQ_REMOVE(&bglobal.bg_pllist, pl, pl_entry);
XFREE(MTYPE_BFDD_LABEL, pl);
}
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