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bfd.c
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bfd.c
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/*********************************************************************
* Copyright 2013 Cumulus Networks, LLC. All rights reserved.
* Copyright 2014,2015,2016,2017 Cumulus Networks, Inc. All rights reserved.
*
* This program 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 of the License, or (at your option)
* any later version.
*
* This program 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 this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* bfd.c: implements the BFD protocol.
*
* Authors
* -------
* Shrijeet Mukherjee [shm@cumulusnetworks.com]
* Kanna Rajagopal [kanna@cumulusnetworks.com]
* Radhika Mahankali [Radhika@cumulusnetworks.com]
*/
#include <zebra.h>
#include "lib/jhash.h"
#include "bfd.h"
DEFINE_QOBJ_TYPE(bfd_session);
/*
* Prototypes
*/
static uint32_t ptm_bfd_gen_ID(void);
static void ptm_bfd_echo_xmt_TO(struct bfd_session *bfd);
static void bfd_session_free(struct bfd_session *bs);
static struct bfd_session *bfd_session_new(int sd);
static struct bfd_session *bfd_find_disc(struct sockaddr_any *sa,
uint32_t ldisc);
static int bfd_session_update(struct bfd_session *bs, struct bfd_peer_cfg *bpc);
static const char *get_diag_str(int diag);
/*
* Functions
*/
struct bfd_session *bs_peer_find(struct bfd_peer_cfg *bpc)
{
struct bfd_session *bs;
struct peer_label *pl;
struct bfd_mhop_key mhop;
struct bfd_shop_key shop;
/* Try to find label first. */
if (bpc->bpc_has_label) {
pl = pl_find(bpc->bpc_label);
if (pl != NULL) {
bs = pl->pl_bs;
return bs;
}
}
/* Otherwise fallback to peer/local hash lookup. */
if (bpc->bpc_mhop) {
memset(&mhop, 0, sizeof(mhop));
mhop.peer = bpc->bpc_peer;
mhop.local = bpc->bpc_local;
if (bpc->bpc_has_vrfname)
strlcpy(mhop.vrf_name, bpc->bpc_vrfname,
sizeof(mhop.vrf_name));
bs = bfd_mhop_lookup(mhop);
} else {
memset(&shop, 0, sizeof(shop));
shop.peer = bpc->bpc_peer;
if (!bpc->bpc_has_vxlan && bpc->bpc_has_localif)
strlcpy(shop.port_name, bpc->bpc_localif,
sizeof(shop.port_name));
bs = bfd_shop_lookup(shop);
}
return bs;
}
static uint32_t ptm_bfd_gen_ID(void)
{
static uint32_t sessionID = 1;
return (sessionID++);
}
void ptm_bfd_start_xmt_timer(struct bfd_session *bfd, bool is_echo)
{
uint64_t jitter, xmt_TO;
int maxpercent;
xmt_TO = is_echo ? bfd->echo_xmt_TO : bfd->xmt_TO;
/*
* From section 6.5.2: trasmit interval should be randomly jittered
* between
* 75% and 100% of nominal value, unless detect_mult is 1, then should
* be
* between 75% and 90%.
*/
maxpercent = (bfd->detect_mult == 1) ? 16 : 26;
jitter = (xmt_TO * (75 + (random() % maxpercent))) / 100;
/* XXX remove that division above */
if (is_echo)
bfd_echo_xmttimer_update(bfd, jitter);
else
bfd_xmttimer_update(bfd, jitter);
}
static void ptm_bfd_echo_xmt_TO(struct bfd_session *bfd)
{
/* Send the scheduled echo packet */
ptm_bfd_echo_snd(bfd);
/* Restart the timer for next time */
ptm_bfd_start_xmt_timer(bfd, true);
}
void ptm_bfd_xmt_TO(struct bfd_session *bfd, int fbit)
{
/* Send the scheduled control packet */
ptm_bfd_snd(bfd, fbit);
/* Restart the timer for next time */
ptm_bfd_start_xmt_timer(bfd, false);
}
void ptm_bfd_echo_stop(struct bfd_session *bfd, int polling)
{
bfd->echo_xmt_TO = 0;
bfd->echo_detect_TO = 0;
BFD_UNSET_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE);
bfd_echo_xmttimer_delete(bfd);
bfd_echo_recvtimer_delete(bfd);
if (polling) {
bfd->polling = polling;
bfd->new_timers.desired_min_tx = bfd->up_min_tx;
bfd->new_timers.required_min_rx = bfd->timers.required_min_rx;
ptm_bfd_snd(bfd, 0);
}
}
void ptm_bfd_echo_start(struct bfd_session *bfd)
{
bfd->echo_detect_TO = (bfd->remote_detect_mult * bfd->echo_xmt_TO);
ptm_bfd_echo_xmt_TO(bfd);
bfd->polling = 1;
bfd->new_timers.desired_min_tx = bfd->up_min_tx;
bfd->new_timers.required_min_rx = bfd->timers.required_min_rx;
ptm_bfd_snd(bfd, 0);
}
void ptm_bfd_ses_up(struct bfd_session *bfd)
{
int old_state = bfd->ses_state;
bfd->local_diag = 0;
bfd->ses_state = PTM_BFD_UP;
bfd->polling = 1;
monotime(&bfd->uptime);
/* If the peer is capable to receiving Echo pkts */
if (bfd->echo_xmt_TO && !BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_MH)) {
ptm_bfd_echo_start(bfd);
} else {
bfd->new_timers.desired_min_tx = bfd->up_min_tx;
bfd->new_timers.required_min_rx = bfd->timers.required_min_rx;
ptm_bfd_snd(bfd, 0);
}
control_notify(bfd);
if (old_state != bfd->ses_state) {
bfd->stats.session_up++;
log_info("state-change: [%s] %s -> %s", bs_to_string(bfd),
state_list[old_state].str,
state_list[bfd->ses_state].str);
}
}
void ptm_bfd_ses_dn(struct bfd_session *bfd, uint8_t diag)
{
int old_state = bfd->ses_state;
bfd->local_diag = diag;
bfd->discrs.remote_discr = 0;
bfd->ses_state = PTM_BFD_DOWN;
bfd->polling = 0;
bfd->demand_mode = 0;
monotime(&bfd->downtime);
ptm_bfd_snd(bfd, 0);
/* only signal clients when going from up->down state */
if (old_state == PTM_BFD_UP)
control_notify(bfd);
/* Stop echo packet transmission if they are active */
if (BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE))
ptm_bfd_echo_stop(bfd, 0);
if (old_state != bfd->ses_state) {
bfd->stats.session_down++;
log_info("state-change: [%s] %s -> %s reason:%s",
bs_to_string(bfd), state_list[old_state].str,
state_list[bfd->ses_state].str,
get_diag_str(bfd->local_diag));
}
}
static int ptm_bfd_get_vrf_name(char *port_name, char *vrf_name)
{
struct bfd_iface *iface;
struct bfd_vrf *vrf;
if ((port_name == NULL) || (vrf_name == NULL))
return -1;
iface = bfd_iface_lookup(port_name);
if (iface) {
vrf = bfd_vrf_lookup(iface->vrf_id);
if (vrf) {
strlcpy(vrf_name, vrf->name, sizeof(vrf->name));
return 0;
}
}
return -1;
}
static struct bfd_session *bfd_find_disc(struct sockaddr_any *sa,
uint32_t ldisc)
{
struct bfd_session *bs;
bs = bfd_id_lookup(ldisc);
if (bs == NULL)
return NULL;
/* Remove unused fields. */
switch (sa->sa_sin.sin_family) {
case AF_INET:
sa->sa_sin.sin_port = 0;
if (memcmp(sa, &bs->shop.peer, sizeof(sa->sa_sin)) == 0)
return bs;
break;
case AF_INET6:
sa->sa_sin6.sin6_port = 0;
if (memcmp(sa, &bs->shop.peer, sizeof(sa->sa_sin6)) == 0)
return bs;
break;
}
return NULL;
}
struct bfd_session *ptm_bfd_sess_find(struct bfd_pkt *cp, char *port_name,
struct sockaddr_any *peer,
struct sockaddr_any *local,
char *vrf_name, bool is_mhop)
{
struct bfd_session *l_bfd = NULL;
struct bfd_mhop_key mhop;
struct bfd_shop_key shop;
char vrf_buf[MAXNAMELEN];
/* Find our session using the ID signaled by the remote end. */
if (cp->discrs.remote_discr)
return bfd_find_disc(peer, ntohl(cp->discrs.remote_discr));
/* Search for session without using discriminator. */
if (is_mhop) {
memset(&mhop, 0, sizeof(mhop));
mhop.peer = *peer;
mhop.local = *local;
if (vrf_name && vrf_name[0]) {
strlcpy(mhop.vrf_name, vrf_name, sizeof(mhop.vrf_name));
} else if (port_name && port_name[0]) {
memset(vrf_buf, 0, sizeof(vrf_buf));
if (ptm_bfd_get_vrf_name(port_name, vrf_buf) != -1)
strlcpy(mhop.vrf_name, vrf_buf,
sizeof(mhop.vrf_name));
}
l_bfd = bfd_mhop_lookup(mhop);
} else {
memset(&shop, 0, sizeof(shop));
shop.peer = *peer;
if (port_name && port_name[0])
strlcpy(shop.port_name, port_name,
sizeof(shop.port_name));
l_bfd = bfd_shop_lookup(shop);
}
/* XXX maybe remoteDiscr should be checked for remoteHeard cases. */
return l_bfd;
}
#if 0 /* TODO VxLAN Support */
static void
_update_vxlan_sess_parms(struct bfd_session *bfd, bfd_sess_parms *sess_parms)
{
struct bfd_session_vxlan_info *vxlan_info = &bfd->vxlan_info;
bfd_parms_list *parms = &sess_parms->parms;
vxlan_info->vnid = parms->vnid;
vxlan_info->check_tnl_key = parms->check_tnl_key;
vxlan_info->forwarding_if_rx = parms->forwarding_if_rx;
vxlan_info->cpath_down = parms->cpath_down;
vxlan_info->decay_min_rx = parms->decay_min_rx;
inet_aton(parms->local_dst_ip, &vxlan_info->local_dst_ip);
inet_aton(parms->remote_dst_ip, &vxlan_info->peer_dst_ip);
memcpy(vxlan_info->local_dst_mac, parms->local_dst_mac, ETH_ALEN);
memcpy(vxlan_info->peer_dst_mac, parms->remote_dst_mac, ETH_ALEN);
/* The interface may change for Vxlan BFD sessions, so update
* the local mac and ifindex
*/
bfd->ifindex = sess_parms->ifindex;
memcpy(bfd->local_mac, sess_parms->local_mac, sizeof(bfd->local_mac));
}
#endif /* VxLAN support */
int bfd_xmt_cb(struct thread *t)
{
struct bfd_session *bs = THREAD_ARG(t);
ptm_bfd_xmt_TO(bs, 0);
return 0;
}
int bfd_echo_xmt_cb(struct thread *t)
{
struct bfd_session *bs = THREAD_ARG(t);
ptm_bfd_echo_xmt_TO(bs);
return 0;
}
/* Was ptm_bfd_detect_TO() */
int bfd_recvtimer_cb(struct thread *t)
{
struct bfd_session *bs = THREAD_ARG(t);
switch (bs->ses_state) {
case PTM_BFD_INIT:
case PTM_BFD_UP:
ptm_bfd_ses_dn(bs, BFD_DIAGDETECTTIME);
bfd_recvtimer_update(bs);
break;
default:
/* Second detect time expiration, zero remote discr (section
* 6.5.1)
*/
bs->discrs.remote_discr = 0;
break;
}
return 0;
}
/* Was ptm_bfd_echo_detect_TO() */
int bfd_echo_recvtimer_cb(struct thread *t)
{
struct bfd_session *bs = THREAD_ARG(t);
switch (bs->ses_state) {
case PTM_BFD_INIT:
case PTM_BFD_UP:
ptm_bfd_ses_dn(bs, BFD_DIAGDETECTTIME);
break;
}
return 0;
}
static struct bfd_session *bfd_session_new(int sd)
{
struct bfd_session *bs;
bs = XCALLOC(MTYPE_BFDD_CONFIG, sizeof(*bs));
if (bs == NULL)
return NULL;
QOBJ_REG(bs, bfd_session);
bs->up_min_tx = BFD_DEFDESIREDMINTX;
bs->timers.required_min_rx = BFD_DEFREQUIREDMINRX;
bs->timers.required_min_echo = BFD_DEF_REQ_MIN_ECHO;
bs->detect_mult = BFD_DEFDETECTMULT;
bs->mh_ttl = BFD_DEF_MHOP_TTL;
bs->sock = sd;
monotime(&bs->uptime);
bs->downtime = bs->uptime;
return bs;
}
int bfd_session_update_label(struct bfd_session *bs, const char *nlabel)
{
/* New label treatment:
* - Check if the label is taken;
* - Try to allocate the memory for it and register;
*/
if (bs->pl == NULL) {
if (pl_find(nlabel) != NULL) {
/* Someone is already using it. */
return -1;
}
if (pl_new(nlabel, bs) == NULL)
return -1;
return 0;
}
/*
* Test label change consistency:
* - Do nothing if it's the same label;
* - Check if the future label is already taken;
* - Change label;
*/
if (strcmp(nlabel, bs->pl->pl_label) == 0)
return -1;
if (pl_find(nlabel) != NULL)
return -1;
strlcpy(bs->pl->pl_label, nlabel, sizeof(bs->pl->pl_label));
return 0;
}
static void _bfd_session_update(struct bfd_session *bs,
struct bfd_peer_cfg *bpc)
{
if (bpc->bpc_echo) {
/* Check if echo mode is already active. */
if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_ECHO))
goto skip_echo;
BFD_SET_FLAG(bs->flags, BFD_SESS_FLAG_ECHO);
ptm_bfd_echo_start(bs);
/* Activate/update echo receive timeout timer. */
bfd_echo_recvtimer_update(bs);
} else {
/* Check if echo mode is already disabled. */
if (!BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_ECHO))
goto skip_echo;
BFD_UNSET_FLAG(bs->flags, BFD_SESS_FLAG_ECHO);
ptm_bfd_echo_stop(bs, 0);
}
skip_echo:
if (bpc->bpc_has_txinterval)
bs->up_min_tx = bpc->bpc_txinterval * 1000;
if (bpc->bpc_has_recvinterval)
bs->timers.required_min_rx = bpc->bpc_recvinterval * 1000;
if (bpc->bpc_has_detectmultiplier)
bs->detect_mult = bpc->bpc_detectmultiplier;
if (bpc->bpc_has_echointerval)
bs->timers.required_min_echo = bpc->bpc_echointerval * 1000;
if (bpc->bpc_has_label)
bfd_session_update_label(bs, bpc->bpc_label);
if (bpc->bpc_shutdown) {
/* Check if already shutdown. */
if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN))
return;
BFD_SET_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN);
/* Disable all events. */
bfd_recvtimer_delete(bs);
bfd_echo_recvtimer_delete(bs);
bfd_xmttimer_delete(bs);
bfd_echo_xmttimer_delete(bs);
/* Change and notify state change. */
bs->ses_state = PTM_BFD_ADM_DOWN;
control_notify(bs);
ptm_bfd_snd(bs, 0);
} else {
/* Check if already working. */
if (!BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN))
return;
BFD_UNSET_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN);
/* Change and notify state change. */
bs->ses_state = PTM_BFD_DOWN;
control_notify(bs);
/* Enable all timers. */
bfd_recvtimer_update(bs);
bfd_xmttimer_update(bs, bs->xmt_TO);
if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_ECHO)) {
bfd_echo_recvtimer_update(bs);
bfd_echo_xmttimer_update(bs, bs->echo_xmt_TO);
}
}
}
static int bfd_session_update(struct bfd_session *bs, struct bfd_peer_cfg *bpc)
{
/* User didn't want to update, return failure. */
if (bpc->bpc_createonly)
return -1;
_bfd_session_update(bs, bpc);
/* TODO add VxLAN support. */
control_notify_config(BCM_NOTIFY_CONFIG_UPDATE, bs);
return 0;
}
static void bfd_session_free(struct bfd_session *bs)
{
if (bs->sock != -1)
close(bs->sock);
bfd_recvtimer_delete(bs);
bfd_echo_recvtimer_delete(bs);
bfd_xmttimer_delete(bs);
bfd_echo_xmttimer_delete(bs);
bfd_id_delete(bs->discrs.my_discr);
if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH))
bfd_mhop_delete(bs->mhop);
else
bfd_shop_delete(bs->shop);
pl_free(bs->pl);
QOBJ_UNREG(bs);
XFREE(MTYPE_BFDD_CONFIG, bs);
}
struct bfd_session *ptm_bfd_sess_new(struct bfd_peer_cfg *bpc)
{
struct bfd_session *bfd, *l_bfd;
int psock;
/* check to see if this needs a new session */
l_bfd = bs_peer_find(bpc);
if (l_bfd) {
/* Requesting a duplicated peer means update configuration. */
if (bfd_session_update(l_bfd, bpc) == 0)
return l_bfd;
else
return NULL;
}
/*
* Get socket for transmitting control packets. Note that if we
* could use the destination port (3784) for the source
* port we wouldn't need a socket per session.
*/
if (bpc->bpc_ipv4) {
psock = bp_peer_socket(bpc);
if (psock == -1)
return NULL;
} else {
psock = bp_peer_socketv6(bpc);
if (psock == -1)
return NULL;
}
/* Get memory */
bfd = bfd_session_new(psock);
if (bfd == NULL) {
log_error("session-new: allocation failed");
return NULL;
}
if (bpc->bpc_has_localif && !bpc->bpc_mhop) {
bfd->ifindex = ptm_bfd_fetch_ifindex(bpc->bpc_localif);
ptm_bfd_fetch_local_mac(bpc->bpc_localif, bfd->local_mac);
}
if (bpc->bpc_has_vxlan)
BFD_SET_FLAG(bfd->flags, BFD_SESS_FLAG_VXLAN);
if (bpc->bpc_ipv4 == false) {
BFD_SET_FLAG(bfd->flags, BFD_SESS_FLAG_IPV6);
/* Set the IPv6 scope id for link-local addresses. */
if (IN6_IS_ADDR_LINKLOCAL(&bpc->bpc_local.sa_sin6.sin6_addr))
bpc->bpc_local.sa_sin6.sin6_scope_id = bfd->ifindex;
if (IN6_IS_ADDR_LINKLOCAL(&bpc->bpc_peer.sa_sin6.sin6_addr))
bpc->bpc_peer.sa_sin6.sin6_scope_id = bfd->ifindex;
}
/* Initialize the session */
bfd->ses_state = PTM_BFD_DOWN;
bfd->discrs.my_discr = ptm_bfd_gen_ID();
bfd->discrs.remote_discr = 0;
bfd->local_ip = bpc->bpc_local;
bfd->local_address = bpc->bpc_local;
bfd->timers.desired_min_tx = bfd->up_min_tx;
bfd->detect_TO = (bfd->detect_mult * BFD_DEF_SLOWTX);
/* Use detect_TO first for slow detection, then use recvtimer_update. */
bfd_recvtimer_update(bfd);
bfd_id_insert(bfd);
if (bpc->bpc_mhop) {
BFD_SET_FLAG(bfd->flags, BFD_SESS_FLAG_MH);
bfd->mhop.peer = bpc->bpc_peer;
bfd->mhop.local = bpc->bpc_local;
if (bpc->bpc_has_vrfname)
strlcpy(bfd->mhop.vrf_name, bpc->bpc_vrfname,
sizeof(bfd->mhop.vrf_name));
bfd_mhop_insert(bfd);
} else {
bfd->shop.peer = bpc->bpc_peer;
if (!bpc->bpc_has_vxlan && bpc->bpc_has_localif)
strlcpy(bfd->shop.port_name, bpc->bpc_localif,
sizeof(bfd->shop.port_name));
bfd_shop_insert(bfd);
}
if (BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_VXLAN)) {
static uint8_t bfd_def_vxlan_dmac[] = {0x00, 0x23, 0x20,
0x00, 0x00, 0x01};
memcpy(bfd->peer_mac, bfd_def_vxlan_dmac,
sizeof(bfd_def_vxlan_dmac));
}
#if 0 /* TODO */
else if (event->rmac) {
if (sscanf(event->rmac, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
&bfd->peer_mac[0], &bfd->peer_mac[1], &bfd->peer_mac[2],
&bfd->peer_mac[3], &bfd->peer_mac[4], &bfd->peer_mac[5])
!= 6)
DLOG("%s: Assigning remote mac = %s", __func__,
event->rmac);
}
#endif
/*
* XXX: session update triggers echo start, so we must have our
* discriminator ID set first.
*/
_bfd_session_update(bfd, bpc);
/* Start transmitting with slow interval until peer responds */
bfd->xmt_TO = BFD_DEF_SLOWTX;
ptm_bfd_xmt_TO(bfd, 0);
log_info("session-new: %s", bs_to_string(bfd));
control_notify_config(BCM_NOTIFY_CONFIG_ADD, bfd);
return bfd;
}
int ptm_bfd_ses_del(struct bfd_peer_cfg *bpc)
{
struct bfd_session *bs;
/* Find session and call free(). */
bs = bs_peer_find(bpc);
if (bs == NULL)
return -1;
/* This pointer is being referenced, don't let it be deleted. */
if (bs->refcount > 0) {
log_error("session-delete: refcount failure: %" PRIu64
" references",
bs->refcount);
return -1;
}
log_info("session-delete: %s", bs_to_string(bs));
control_notify_config(BCM_NOTIFY_CONFIG_DELETE, bs);
bfd_session_free(bs);
return 0;
}
void bfd_set_polling(struct bfd_session *bs)
{
bs->new_timers.desired_min_tx = bs->up_min_tx;
bs->new_timers.required_min_rx = bs->timers.required_min_rx;
bs->new_timers.required_min_echo = bs->timers.required_min_echo;
bs->polling = 1;
}
/*
* Helper functions.
*/
static const char *get_diag_str(int diag)
{
for (int i = 0; diag_list[i].str; i++) {
if (diag_list[i].type == diag)
return diag_list[i].str;
}
return "N/A";
}
const char *satostr(struct sockaddr_any *sa)
{
#define INETSTR_BUFCOUNT 8
static char buf[INETSTR_BUFCOUNT][INET6_ADDRSTRLEN];
static int bufidx;
struct sockaddr_in *sin = &sa->sa_sin;
struct sockaddr_in6 *sin6 = &sa->sa_sin6;
bufidx += (bufidx + 1) % INETSTR_BUFCOUNT;
buf[bufidx][0] = 0;
switch (sin->sin_family) {
case AF_INET:
inet_ntop(AF_INET, &sin->sin_addr, buf[bufidx],
sizeof(buf[bufidx]));
break;
case AF_INET6:
inet_ntop(AF_INET6, &sin6->sin6_addr, buf[bufidx],
sizeof(buf[bufidx]));
break;
default:
strlcpy(buf[bufidx], "unknown", sizeof(buf[bufidx]));
break;
}
return buf[bufidx];
}
const char *diag2str(uint8_t diag)
{
switch (diag) {
case 0:
return "ok";
case 1:
return "control detection time expired";
case 2:
return "echo function failed";
case 3:
return "neighbor signaled session down";
case 4:
return "forwarding plane reset";
case 5:
return "path down";
case 6:
return "concatenated path down";
case 7:
return "administratively down";
case 8:
return "reverse concatenated path down";
default:
return "unknown";
}
}
int strtosa(const char *addr, struct sockaddr_any *sa)
{
memset(sa, 0, sizeof(*sa));
if (inet_pton(AF_INET, addr, &sa->sa_sin.sin_addr) == 1) {
sa->sa_sin.sin_family = AF_INET;
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
sa->sa_sin.sin_len = sizeof(sa->sa_sin);
#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
return 0;
}
if (inet_pton(AF_INET6, addr, &sa->sa_sin6.sin6_addr) == 1) {
sa->sa_sin6.sin6_family = AF_INET6;
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
sa->sa_sin6.sin6_len = sizeof(sa->sa_sin6);
#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
return 0;
}
return -1;
}
void integer2timestr(uint64_t time, char *buf, size_t buflen)
{
unsigned int year, month, day, hour, minute, second;
int rv;
#define MINUTES (60)
#define HOURS (24 * MINUTES)
#define DAYS (30 * HOURS)
#define MONTHS (12 * DAYS)
#define YEARS (MONTHS)
if (time >= YEARS) {
year = time / YEARS;
time -= year * YEARS;
rv = snprintf(buf, buflen, "%u year(s), ", year);
buf += rv;
buflen -= rv;
}
if (time >= MONTHS) {
month = time / MONTHS;
time -= month * MONTHS;
rv = snprintf(buf, buflen, "%u month(s), ", month);
buf += rv;
buflen -= rv;
}
if (time >= DAYS) {
day = time / DAYS;
time -= day * DAYS;
rv = snprintf(buf, buflen, "%u day(s), ", day);
buf += rv;
buflen -= rv;
}
if (time >= HOURS) {
hour = time / HOURS;
time -= hour * HOURS;
rv = snprintf(buf, buflen, "%u hour(s), ", hour);
buf += rv;
buflen -= rv;
}
if (time >= MINUTES) {
minute = time / MINUTES;
time -= minute * MINUTES;
rv = snprintf(buf, buflen, "%u minute(s), ", minute);
buf += rv;
buflen -= rv;
}
second = time % MINUTES;
snprintf(buf, buflen, "%u second(s)", second);
}
const char *bs_to_string(struct bfd_session *bs)
{
static char buf[256];
int pos;
bool is_mhop = BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH);
pos = snprintf(buf, sizeof(buf), "mhop:%s", is_mhop ? "yes" : "no");
if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH)) {
pos += snprintf(buf + pos, sizeof(buf) - pos,
" peer:%s local:%s", satostr(&bs->mhop.peer),
satostr(&bs->mhop.local));
if (bs->mhop.vrf_name[0])
snprintf(buf + pos, sizeof(buf) - pos, " vrf:%s",
bs->mhop.vrf_name);
} else {
pos += snprintf(buf + pos, sizeof(buf) - pos, " peer:%s",
satostr(&bs->shop.peer));
if (bs->local_address.sa_sin.sin_family)
pos += snprintf(buf + pos, sizeof(buf) - pos,
" local:%s",
satostr(&bs->local_address));
if (bs->shop.port_name[0])
snprintf(buf + pos, sizeof(buf) - pos, " interface:%s",
bs->shop.port_name);
}
return buf;
}
/*
* BFD hash data structures to find sessions.
*/
static struct hash *bfd_id_hash;
static struct hash *bfd_shop_hash;
static struct hash *bfd_mhop_hash;
static struct hash *bfd_vrf_hash;
static struct hash *bfd_iface_hash;
static unsigned int bfd_id_hash_do(void *p);
static int bfd_id_hash_cmp(const void *n1, const void *n2);
static unsigned int bfd_shop_hash_do(void *p);
static int bfd_shop_hash_cmp(const void *n1, const void *n2);
static unsigned int bfd_mhop_hash_do(void *p);
static int bfd_mhop_hash_cmp(const void *n1, const void *n2);
static unsigned int bfd_vrf_hash_do(void *p);
static int bfd_vrf_hash_cmp(const void *n1, const void *n2);
static unsigned int bfd_iface_hash_do(void *p);
static int bfd_iface_hash_cmp(const void *n1, const void *n2);
static void _shop_key(struct bfd_session *bs, const struct bfd_shop_key *shop);
static void _shop_key2(struct bfd_session *bs, const struct bfd_shop_key *shop);
static void _mhop_key(struct bfd_session *bs, const struct bfd_mhop_key *mhop);
static int _iface_key(struct bfd_iface *iface, const char *ifname);
static void _bfd_free(struct hash_backet *hb,
void *arg __attribute__((__unused__)));
static void _vrf_free(void *arg);
static void _iface_free(void *arg);
/* BFD hash for our discriminator. */
static unsigned int bfd_id_hash_do(void *p)
{
struct bfd_session *bs = p;
return jhash_1word(bs->discrs.my_discr, 0);
}
static int bfd_id_hash_cmp(const void *n1, const void *n2)
{
const struct bfd_session *bs1 = n1, *bs2 = n2;
return bs1->discrs.my_discr == bs2->discrs.my_discr;
}
/* BFD hash for single hop. */
static unsigned int bfd_shop_hash_do(void *p)
{
struct bfd_session *bs = p;
return jhash(&bs->shop, sizeof(bs->shop), 0);
}
static int bfd_shop_hash_cmp(const void *n1, const void *n2)
{
const struct bfd_session *bs1 = n1, *bs2 = n2;
return memcmp(&bs1->shop, &bs2->shop, sizeof(bs1->shop)) == 0;
}
/* BFD hash for multi hop. */
static unsigned int bfd_mhop_hash_do(void *p)
{
struct bfd_session *bs = p;
return jhash(&bs->mhop, sizeof(bs->mhop), 0);
}
static int bfd_mhop_hash_cmp(const void *n1, const void *n2)
{
const struct bfd_session *bs1 = n1, *bs2 = n2;
return memcmp(&bs1->mhop, &bs2->mhop, sizeof(bs1->mhop)) == 0;
}
/* BFD hash for VRFs. */
static unsigned int bfd_vrf_hash_do(void *p)
{
struct bfd_vrf *vrf = p;
return jhash_1word(vrf->vrf_id, 0);
}
static int bfd_vrf_hash_cmp(const void *n1, const void *n2)
{
const struct bfd_vrf *v1 = n1, *v2 = n2;
return v1->vrf_id == v2->vrf_id;
}
/* BFD hash for interfaces. */
static unsigned int bfd_iface_hash_do(void *p)
{
struct bfd_iface *iface = p;
return string_hash_make(iface->ifname);
}
static int bfd_iface_hash_cmp(const void *n1, const void *n2)
{