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/* $OpenBSD: switch.c,v 1.3 2016/09/18 13:17:40 rzalamena Exp $ */
/*
* Copyright (c) 2013-2016 Reyk Floeter <reyk@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <imsg.h>
#include <event.h>
#include "switchd.h"
void switch_timer(struct switchd *, void *);
static __inline int
switch_cmp(struct switch_control *, struct switch_control *);
static __inline int
switch_maccmp(struct macaddr *, struct macaddr *);
void
switch_init(struct switchd *sc)
{
RB_INIT(&sc->sc_switches);
}
int
switch_dispatch_control(int fd, struct privsep_proc *p, struct imsg *imsg)
{
struct privsep *ps = p->p_ps;
struct switchd *sc = ps->ps_env;
struct switch_control *sw;
struct macaddr *mac;
struct iovec iov[2];
switch (imsg->hdr.type) {
case IMSG_CTL_SHOW_SUM:
IMSG_SIZE_CHECK(imsg, &fd);
RB_FOREACH(sw, switch_head, &sc->sc_switches) {
iov[0].iov_base = imsg->data;
iov[0].iov_len = IMSG_DATA_SIZE(imsg);
iov[1].iov_base = sw;
iov[1].iov_len = sizeof(*sw);
proc_composev(ps, PROC_CONTROL,
IMSG_CTL_SWITCH, iov, 2);
RB_FOREACH(mac, macaddr_head, &sw->sw_addrcache) {
iov[0].iov_base = imsg->data;
iov[0].iov_len = IMSG_DATA_SIZE(imsg);
iov[1].iov_base = mac;
iov[1].iov_len = sizeof(*mac);
proc_composev(ps, PROC_CONTROL,
IMSG_CTL_MAC, iov, 2);
}
}
proc_compose(ps, PROC_CONTROL,
IMSG_CTL_END, imsg->data, IMSG_DATA_SIZE(imsg));
return (0);
default:
break;
}
return (-1);
}
struct switch_control *
switch_get(struct switch_connection *con)
{
struct switchd *sc = con->con_sc;
struct switch_control key;
memcpy(&key.sw_addr, &con->con_peer, sizeof(key.sw_addr));
con->con_switch = RB_FIND(switch_head, &sc->sc_switches, &key);
return (con->con_switch);
}
struct switch_control *
switch_add(struct switch_connection *con)
{
struct switchd *sc = con->con_sc;
struct switch_control *sw, *oldsw;
static unsigned int id = 0;
/* Connection already has an associated switch */
if (con->con_switch != NULL)
return (NULL);
if ((sw = calloc(1, sizeof(*sw))) == NULL)
return (NULL);
memcpy(&sw->sw_addr, &con->con_peer, sizeof(sw->sw_addr));
sw->sw_id = ++id;
RB_INIT(&sw->sw_addrcache);
if ((oldsw =
RB_INSERT(switch_head, &sc->sc_switches, sw)) != NULL) {
free(sw);
sw = oldsw;
} else {
timer_set(sc, &sw->sw_timer, switch_timer, sw);
timer_add(sc, &sw->sw_timer, sc->sc_cache_timeout);
}
con->con_switch = sw;
return (con->con_switch);
}
void
switch_timer(struct switchd *sc, void *arg)
{
struct switch_control *sw = arg;
struct macaddr *mac, *next;
struct timeval tv;
unsigned int cnt = 0;
getmonotime(&tv);
for (mac = RB_MIN(macaddr_head, &sw->sw_addrcache);
mac != NULL; mac = next) {
next = RB_NEXT(macaddr_head, &sw->sw_addrcache, mac);
/* Simple monotonic timeout */
if ((tv.tv_sec - mac->mac_age) >= sc->sc_cache_timeout) {
RB_REMOVE(macaddr_head, &sw->sw_addrcache, mac);
sw->sw_cachesize--;
free(mac);
cnt++;
}
}
if (cnt)
log_debug("%s: flushed %d mac from switch %u after timeout",
__func__, cnt, sw->sw_id);
timer_add(sc, &sw->sw_timer, sc->sc_cache_timeout);
}
void
switch_remove(struct switchd *sc, struct switch_control *sw)
{
struct macaddr *mac, *next;
if (sw == NULL)
return;
timer_del(sc, &sw->sw_timer);
for (mac = RB_MIN(macaddr_head, &sw->sw_addrcache);
mac != NULL; mac = next) {
next = RB_NEXT(macaddr_head, &sw->sw_addrcache, mac);
RB_REMOVE(macaddr_head, &sw->sw_addrcache, mac);
sw->sw_cachesize--;
free(mac);
}
RB_REMOVE(switch_head, &sc->sc_switches, sw);
log_debug("%s: switch %u removed", __func__, sw->sw_id);
free(sw);
}
struct macaddr *
switch_learn(struct switchd *sc, struct switch_control *sw,
uint8_t *ea, uint32_t port)
{
struct macaddr *mac, *oldmac = NULL;
struct timeval tv;
if ((mac = oldmac = switch_cached(sw, ea)) != NULL)
goto update;
if (sw->sw_cachesize >= sc->sc_cache_max)
return (NULL);
if ((mac = calloc(1, sizeof(*mac))) == NULL)
return (NULL);
memcpy(&mac->mac_addr, ea, sizeof(mac->mac_addr));
if (RB_INSERT(macaddr_head, &sw->sw_addrcache, mac) != NULL)
fatalx("cache corrupted");
sw->sw_cachesize++;
update:
getmonotime(&tv);
mac->mac_port = port;
mac->mac_age = tv.tv_sec;
log_debug("%s: %s mac %s on switch %u port %u",
__func__, oldmac == NULL ? "learned new" : "updated",
print_ether(ea), sw->sw_id, port);
return (mac);
}
struct macaddr *
switch_cached(struct switch_control *sw, uint8_t *ea)
{
struct macaddr key;
memcpy(&key.mac_addr, ea, sizeof(key.mac_addr));
return (RB_FIND(macaddr_head, &sw->sw_addrcache, &key));
}
static __inline int
switch_cmp(struct switch_control *a, struct switch_control *b)
{
int diff = 0;
diff = sockaddr_cmp((struct sockaddr *)&a->sw_addr,
(struct sockaddr *)&b->sw_addr, 128);
if (!diff)
diff = socket_getport(&a->sw_addr) -
socket_getport(&b->sw_addr);
return (diff);
}
static __inline int
switch_maccmp(struct macaddr *a, struct macaddr *b)
{
return (memcmp(a->mac_addr, b->mac_addr, sizeof(a->mac_addr)));
}
RB_GENERATE(switch_head, switch_control, sw_entry, switch_cmp);
RB_GENERATE(macaddr_head, macaddr, mac_entry, switch_maccmp);
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