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/* $OpenBSD: ofp.c,v 1.18 2016/12/22 15:31:43 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/socket.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <sys/queue.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <net/ofp.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <pwd.h>
#include <event.h>
#include "ofp10.h"
#include "switchd.h"
#include "ofp_map.h"
int ofp_dispatch_parent(int, struct privsep_proc *, struct imsg *);
int ofp_dispatch_control(int, struct privsep_proc *, struct imsg *);
void ofp_run(struct privsep *, struct privsep_proc *, void *);
int ofp_add_device(struct switchd *, int, const char *);
static struct privsep_proc procs[] = {
{ "control", PROC_CONTROL, ofp_dispatch_control },
{ "parent", PROC_PARENT, ofp_dispatch_parent }
};
void
ofp(struct privsep *ps, struct privsep_proc *p)
{
ofrelay(ps, p);
proc_run(ps, p, procs, nitems(procs), ofp_run, NULL);
}
void
ofp_run(struct privsep *ps, struct privsep_proc *p, void *arg)
{
struct switchd *sc = ps->ps_env;
/*
* pledge in the ofp process:
* stdio - for malloc and basic I/O including events.
* inet - for handling tcp connections with OpenFlow peers.
* recvfd - for receiving new sockets on reload.
*/
if (pledge("stdio inet recvfd", NULL) == -1)
fatal("pledge");
TAILQ_INIT(&sc->sc_conns);
sc->sc_tap = -1;
ofrelay_run(ps, p, NULL);
}
int
ofp_dispatch_control(int fd, struct privsep_proc *p, struct imsg *imsg)
{
switch (imsg->hdr.type) {
case IMSG_CTL_SHOW_SUM:
return (switch_dispatch_control(fd, p, imsg));
default:
break;
}
return (-1);
}
int
ofp_dispatch_parent(int fd, struct privsep_proc *p, struct imsg *imsg)
{
struct privsep *ps = p->p_ps;
struct switchd *sc = ps->ps_env;
struct switch_client swc;
struct switch_connection *con;
switch (imsg->hdr.type) {
case IMSG_TAPFD:
if (sc->sc_tap != -1)
close(sc->sc_tap);
sc->sc_tap = imsg->fd;
return (0);
case IMSG_CTL_CONNECT:
case IMSG_CTL_DISCONNECT:
IMSG_SIZE_CHECK(imsg, &swc);
memcpy(&swc, imsg->data, sizeof(swc));
if (imsg->hdr.type == IMSG_CTL_CONNECT)
ofrelay_attach(&sc->sc_server, imsg->fd,
(struct sockaddr *)&swc.swc_addr.swa_addr);
else if ((con = switchd_connbyaddr(sc,
(struct sockaddr *)&swc.swc_addr.swa_addr)) != NULL)
ofp_close(con);
return (0);
default:
break;
}
return (-1);
}
int
ofp_input(struct switch_connection *con, struct ibuf *ibuf)
{
struct switchd *sc = con->con_sc;
struct ofp_header *oh;
if ((oh = ibuf_seek(ibuf, 0, sizeof(*oh))) == NULL) {
log_debug("short header");
return (-1);
}
/* Check for message version match. */
if (con->con_state > OFP_STATE_HELLO_WAIT &&
con->con_version != OFP_V_0 &&
oh->oh_version != con->con_version) {
log_debug("wrong version %s, expected %s",
print_map(oh->oh_version, ofp_v_map),
print_map(con->con_version, ofp_v_map));
return (-1);
}
/* Check the state machine to decide whether or not to allow. */
if (con->con_state <= OFP_STATE_HELLO_WAIT &&
oh->oh_type > OFP_T_ERROR) {
log_debug("expected hello, got %s",
print_map(oh->oh_type, ofp_t_map));
return (-1);
}
switch (oh->oh_version) {
case OFP_V_1_0:
if (ofp10_input(sc, con, oh, ibuf) != 0)
return (-1);
break;
case OFP_V_1_3:
if (ofp13_input(sc, con, oh, ibuf) != 0)
return (-1);
break;
case OFP_V_1_1:
case OFP_V_1_2:
/* FALLTHROUGH */
default:
(void)ofp10_validate(sc,
&con->con_peer, &con->con_local, oh, ibuf);
ofp10_hello(sc, con, oh, ibuf);
return (-1);
}
return (0);
}
int
ofp_open(struct privsep *ps, struct switch_connection *con)
{
struct switch_control *sw;
/* Get associated switch, if it exists */
sw = switch_get(con);
log_info("%s: new connection %u.%u from switch %u",
__func__, con->con_id, con->con_instance,
sw == NULL ? 0 : sw->sw_id);
/* Send the hello with the latest version we support. */
if (ofp_send_hello(ps->ps_env, con, OFP_V_1_3) == -1)
return (-1);
if (ofp_nextstate(ps->ps_env, con, OFP_STATE_HELLO_WAIT) == -1)
return (-1);
return (0);
}
void
ofp_close(struct switch_connection *con)
{
ofrelay_close(con);
}
int
ofp_nextstate(struct switchd *sc, struct switch_connection *con,
enum ofp_state state)
{
int rv = 0;
switch (con->con_state) {
case OFP_STATE_CLOSED:
if (state != OFP_STATE_HELLO_WAIT)
return (-1);
break;
case OFP_STATE_HELLO_WAIT:
if (state != OFP_STATE_FEATURE_WAIT)
return (-1);
rv = ofp_send_featuresrequest(sc, con);
break;
case OFP_STATE_FEATURE_WAIT:
if (state != OFP_STATE_ESTABLISHED)
return (-1);
if (con->con_version != OFP_V_1_3)
break;
#if 0
/* Let's not ask this while we don't use it. */
ofp13_flow_stats(sc, con, OFP_PORT_ANY, OFP_GROUP_ID_ANY,
OFP_TABLE_ID_ALL);
ofp13_desc(sc, con);
#endif
rv |= ofp13_table_features(sc, con, 0);
rv |= ofp13_setconfig(sc, con, OFP_CONFIG_FRAG_NORMAL,
OFP_CONTROLLER_MAXLEN_NO_BUFFER);
break;
case OFP_STATE_ESTABLISHED:
if (state != OFP_STATE_CLOSED)
return (-1);
break;
default:
return (-1);
}
/* Set the next state. */
con->con_state = state;
return (rv);
}
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