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/**
* bfd.c: BFD handling routines
*
* @copyright Copyright (C) 2015 Cumulus Networks, Inc.
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include "command.h"
#include "memory.h"
#include "prefix.h"
#include "thread.h"
#include "stream.h"
#include "zclient.h"
#include "table.h"
#include "vty.h"
#include "bfd.h"
DEFINE_MTYPE_STATIC(LIB, BFD_INFO, "BFD info")
int bfd_debug = 0;
struct bfd_gbl bfd_gbl;
/*
* bfd_gbl_init - Initialize the BFD global structure
*/
void
bfd_gbl_init(void)
{
memset(&bfd_gbl, 0, sizeof (struct bfd_gbl));
}
/*
* bfd_gbl_exit - Called when daemon exits
*/
void
bfd_gbl_exit(void)
{
SET_FLAG (bfd_gbl.flags, BFD_GBL_FLAG_IN_SHUTDOWN);
}
/*
* bfd_info_create - Allocate the BFD information
*/
struct bfd_info *
bfd_info_create(void)
{
struct bfd_info *bfd_info;
bfd_info = XCALLOC (MTYPE_BFD_INFO, sizeof (struct bfd_info));
assert(bfd_info);
bfd_info->status = BFD_STATUS_UNKNOWN;
bfd_info->type = BFD_TYPE_NOT_CONFIGURED;
bfd_info->last_update = 0;
return bfd_info;
}
/*
* bfd_info_free - Free the BFD information.
*/
void
bfd_info_free(struct bfd_info **bfd_info)
{
if (*bfd_info)
{
XFREE (MTYPE_BFD_INFO, *bfd_info);
*bfd_info = NULL;
}
}
/*
* bfd_validate_param - Validate the BFD paramter information.
*/
int
bfd_validate_param(struct vty *vty, const char *dm_str, const char *rx_str,
const char *tx_str, u_int8_t *dm_val, u_int32_t *rx_val,
u_int32_t *tx_val)
{
VTY_GET_INTEGER_RANGE ("detect-mul", *dm_val, dm_str,
BFD_MIN_DETECT_MULT, BFD_MAX_DETECT_MULT);
VTY_GET_INTEGER_RANGE ("min-rx", *rx_val, rx_str,
BFD_MIN_MIN_RX, BFD_MAX_MIN_RX);
VTY_GET_INTEGER_RANGE ("min-tx", *tx_val, tx_str,
BFD_MIN_MIN_TX, BFD_MAX_MIN_TX);
return CMD_SUCCESS;
}
/*
* bfd_set_param - Set the configured BFD paramter values
*/
void
bfd_set_param (struct bfd_info **bfd_info, u_int32_t min_rx, u_int32_t min_tx,
u_int8_t detect_mult, int defaults, int *command)
{
if (!*bfd_info)
{
*bfd_info = bfd_info_create();
*command = ZEBRA_BFD_DEST_REGISTER;
}
else
{
if (((*bfd_info)->required_min_rx != min_rx) ||
((*bfd_info)->desired_min_tx != min_tx) ||
((*bfd_info)->detect_mult != detect_mult))
*command = ZEBRA_BFD_DEST_UPDATE;
}
if (*command)
{
(*bfd_info)->required_min_rx = min_rx;
(*bfd_info)->desired_min_tx = min_tx;
(*bfd_info)->detect_mult = detect_mult;
}
if (!defaults)
SET_FLAG ((*bfd_info)->flags, BFD_FLAG_PARAM_CFG);
else
UNSET_FLAG ((*bfd_info)->flags, BFD_FLAG_PARAM_CFG);
}
/*
* bfd_peer_sendmsg - Format and send a peer register/Unregister
* command to Zebra to be forwarded to BFD
*/
void
bfd_peer_sendmsg (struct zclient *zclient, struct bfd_info *bfd_info,
int family, void *dst_ip, void *src_ip, char *if_name,
int ttl, int multihop, int command, int set_flag,
vrf_id_t vrf_id)
{
struct stream *s;
int ret;
int len;
/* Individual reg/dereg messages are supressed during shutdown. */
if (CHECK_FLAG (bfd_gbl.flags, BFD_GBL_FLAG_IN_SHUTDOWN))
{
if (bfd_debug)
zlog_debug("%s: Suppressing BFD peer reg/dereg messages", __FUNCTION__);
return;
}
/* Check socket. */
if (!zclient || zclient->sock < 0)
{
if (bfd_debug)
zlog_debug("%s: Can't send BFD peer register, Zebra client not "
"established", __FUNCTION__);
return;
}
s = zclient->obuf;
stream_reset (s);
zclient_create_header (s, command, vrf_id);
stream_putl(s, getpid());
stream_putw(s, family);
switch (family)
{
case AF_INET:
stream_put_in_addr (s, (struct in_addr *)dst_ip);
break;
case AF_INET6:
stream_put(s, dst_ip, 16);
break;
default:
break;
}
if (command != ZEBRA_BFD_DEST_DEREGISTER)
{
stream_putl(s, bfd_info->required_min_rx);
stream_putl(s, bfd_info->desired_min_tx);
stream_putc(s, bfd_info->detect_mult);
}
if (multihop)
{
stream_putc(s, 1);
/* Multi-hop destination send the source IP address to BFD */
if (src_ip)
{
stream_putw(s, family);
switch (family)
{
case AF_INET:
stream_put_in_addr (s, (struct in_addr *) src_ip);
break;
case AF_INET6:
stream_put(s, src_ip, 16);
break;
default:
break;
}
}
stream_putc(s, ttl);
}
else
{
stream_putc(s, 0);
if ((family == AF_INET6) && (src_ip))
{
stream_putw(s, family);
stream_put(s, src_ip, 16);
}
if (if_name)
{
len = strlen(if_name);
stream_putc(s, len);
stream_put(s, if_name, len);
}
else
{
stream_putc(s, 0);
}
}
stream_putw_at (s, 0, stream_get_endp (s));
ret = zclient_send_message(zclient);
if (ret < 0)
{
if (bfd_debug)
zlog_debug("bfd_peer_sendmsg: zclient_send_message() failed");
return;
}
if (set_flag)
{
if (command == ZEBRA_BFD_DEST_REGISTER)
SET_FLAG(bfd_info->flags, BFD_FLAG_BFD_REG);
else if (command == ZEBRA_BFD_DEST_DEREGISTER)
UNSET_FLAG(bfd_info->flags, BFD_FLAG_BFD_REG);
}
return;
}
/*
* bfd_get_command_dbg_str - Convert command to a debug string.
*/
const char *
bfd_get_command_dbg_str(int command)
{
switch (command)
{
case ZEBRA_BFD_DEST_REGISTER:
return "Register";
case ZEBRA_BFD_DEST_DEREGISTER:
return "Deregister";
case ZEBRA_BFD_DEST_UPDATE:
return "Update";
default:
return "Unknown";
}
}
/*
* bfd_get_peer_info - Extract the Peer information for which the BFD session
* went down from the message sent from Zebra to clients.
*/
struct interface *
bfd_get_peer_info (struct stream *s, struct prefix *dp, struct prefix *sp,
int *status, vrf_id_t vrf_id)
{
unsigned int ifindex;
struct interface *ifp = NULL;
int plen;
/* Get interface index. */
ifindex = stream_getl (s);
/* Lookup index. */
if (ifindex != 0)
{
ifp = if_lookup_by_index (ifindex, vrf_id);
if (ifp == NULL)
{
if (bfd_debug)
zlog_debug ("zebra_interface_bfd_read: "
"Can't find interface by ifindex: %d ", ifindex);
return NULL;
}
}
/* Fetch destination address. */
dp->family = stream_getc (s);
plen = prefix_blen (dp);
stream_get (&dp->u.prefix, s, plen);
dp->prefixlen = stream_getc (s);
/* Get BFD status. */
*status = stream_getl (s);
if (sp)
{
sp->family = stream_getc (s);
plen = prefix_blen (sp);
stream_get (&sp->u.prefix, s, plen);
sp->prefixlen = stream_getc (s);
}
return ifp;
}
/*
* bfd_get_status_str - Convert BFD status to a display string.
*/
const char *
bfd_get_status_str(int status)
{
switch (status)
{
case BFD_STATUS_DOWN:
return "Down";
case BFD_STATUS_UP:
return "Up";
case BFD_STATUS_UNKNOWN:
default:
return "Unknown";
}
}
/*
* bfd_last_update - Calculate the last BFD update time and convert it
* into a dd:hh:mm:ss display format.
*/
static void
bfd_last_update (time_t last_update, char *buf, size_t len)
{
time_t curr;
time_t diff;
struct tm *tm;
struct timeval tv;
/* If no BFD satatus update has ever been received, print `never'. */
if (last_update == 0)
{
snprintf (buf, len, "never");
return;
}
/* Get current time. */
monotime(&tv);
curr = tv.tv_sec;
diff = curr - last_update;
tm = gmtime (&diff);
snprintf (buf, len, "%d:%02d:%02d:%02d",
tm->tm_yday, tm->tm_hour, tm->tm_min, tm->tm_sec);
}
/*
* bfd_show_param - Show the BFD parameter information.
*/
void
bfd_show_param(struct vty *vty, struct bfd_info *bfd_info, int bfd_tag,
int extra_space, u_char use_json, json_object *json_obj)
{
json_object *json_bfd = NULL;
if (!bfd_info)
return;
if (use_json)
{
if (bfd_tag)
json_bfd = json_object_new_object();
else
json_bfd = json_obj;
json_object_int_add(json_bfd, "detectMultiplier", bfd_info->detect_mult);
json_object_int_add(json_bfd, "rxMinInterval", bfd_info->required_min_rx);
json_object_int_add(json_bfd, "txMinInterval", bfd_info->desired_min_tx);
if (bfd_tag)
json_object_object_add(json_obj, "peerBfdInfo", json_bfd);
}
else
{
vty_out (vty, " %s%sDetect Mul: %d, Min Rx interval: %d,"
" Min Tx interval: %d%s",
(extra_space) ? " ": "", (bfd_tag) ? "BFD: " : " ",
bfd_info->detect_mult, bfd_info->required_min_rx,
bfd_info->desired_min_tx, VTY_NEWLINE);
}
}
/*
* bfd_show_status - Show the BFD status information.
*/
static void
bfd_show_status(struct vty *vty, struct bfd_info *bfd_info, int bfd_tag,
int extra_space, u_char use_json, json_object *json_bfd)
{
char time_buf[32];
if (!bfd_info)
return;
bfd_last_update(bfd_info->last_update, time_buf, 32);
if (use_json)
{
json_object_string_add(json_bfd, "status",
bfd_get_status_str(bfd_info->status));
json_object_string_add(json_bfd, "lastUpdate", time_buf);
}
else
{
vty_out (vty, " %s%sStatus: %s, Last update: %s%s",
(extra_space) ? " ": "", (bfd_tag) ? "BFD: " : " ",
bfd_get_status_str(bfd_info->status), time_buf, VTY_NEWLINE);
}
}
/*
* bfd_show_info - Show the BFD information.
*/
void
bfd_show_info(struct vty *vty, struct bfd_info *bfd_info, int multihop,
int extra_space, u_char use_json, json_object *json_obj)
{
json_object *json_bfd = NULL;
if (!bfd_info)
return;
if (use_json)
{
json_bfd = json_object_new_object();
if (multihop)
json_object_string_add(json_bfd, "type", "multi hop");
else
json_object_string_add(json_bfd, "type", "single hop");
}
else
{
vty_out (vty, " %sBFD: Type: %s%s", (extra_space) ? " " : "",
(multihop) ? "multi hop" : "single hop", VTY_NEWLINE);
}
bfd_show_param(vty, bfd_info, 0, extra_space, use_json, json_bfd);
bfd_show_status(vty, bfd_info, 0, extra_space, use_json, json_bfd);
if (use_json)
json_object_object_add(json_obj, "peerBfdInfo", json_bfd);
else
vty_out (vty, "%s", VTY_NEWLINE);
}
/*
* bfd_client_sendmsg - Format and send a client register
* command to Zebra to be forwarded to BFD
*/
void
bfd_client_sendmsg (struct zclient *zclient, int command)
{
struct stream *s;
int ret;
/* Check socket. */
if (!zclient || zclient->sock < 0)
{
if (bfd_debug)
zlog_debug ("%s: Can't send BFD client register, Zebra client not "
"established", __FUNCTION__);
return;
}
s = zclient->obuf;
stream_reset (s);
zclient_create_header (s, command, VRF_DEFAULT);
stream_putl(s, getpid());
stream_putw_at (s, 0, stream_get_endp (s));
ret = zclient_send_message(zclient);
if (ret < 0)
{
if (bfd_debug)
zlog_debug ("bfd_client_sendmsg %ld: zclient_send_message() failed",
(long) getpid());
return;
}
return;
}
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