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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Vincenzo Maffione <vmaffione@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef WITHOUT_CAPSICUM
#include <sys/capsicum.h>
#endif
#include <sys/socket.h>
#include <sys/sysctl.h>
#ifndef WITHOUT_CAPSICUM
#include <capsicum_helpers.h>
#endif
#include <err.h>
#include <netgraph.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include "config.h"
#include "debug.h"
#include "net_backends.h"
#include "net_backends_priv.h"
#define NG_SBUF_MAX_SIZE (4 * 1024 * 1024)
static int
ng_init(struct net_backend *be, const char *devname __unused,
nvlist_t *nvl, net_be_rxeof_t cb, void *param)
{
struct tap_priv *p = NET_BE_PRIV(be);
struct ngm_connect ngc;
const char *value, *nodename;
int sbsz;
int ctrl_sock;
int flags;
unsigned long maxsbsz;
size_t msbsz;
#ifndef WITHOUT_CAPSICUM
cap_rights_t rights;
#endif
if (cb == NULL) {
EPRINTLN("Netgraph backend requires non-NULL callback");
return (-1);
}
be->fd = -1;
memset(&ngc, 0, sizeof(ngc));
value = get_config_value_node(nvl, "path");
if (value == NULL) {
EPRINTLN("path must be provided");
return (-1);
}
strncpy(ngc.path, value, NG_PATHSIZ - 1);
value = get_config_value_node(nvl, "hook");
if (value == NULL)
value = "vmlink";
strncpy(ngc.ourhook, value, NG_HOOKSIZ - 1);
value = get_config_value_node(nvl, "peerhook");
if (value == NULL) {
EPRINTLN("peer hook must be provided");
return (-1);
}
strncpy(ngc.peerhook, value, NG_HOOKSIZ - 1);
nodename = get_config_value_node(nvl, "socket");
if (NgMkSockNode(nodename,
&ctrl_sock, &be->fd) < 0) {
EPRINTLN("can't get Netgraph sockets");
return (-1);
}
if (NgSendMsg(ctrl_sock, ".",
NGM_GENERIC_COOKIE,
NGM_CONNECT, &ngc, sizeof(ngc)) < 0) {
EPRINTLN("can't connect to node");
close(ctrl_sock);
goto error;
}
close(ctrl_sock);
flags = fcntl(be->fd, F_GETFL);
if (flags < 0) {
EPRINTLN("can't get socket flags");
goto error;
}
if (fcntl(be->fd, F_SETFL, flags | O_NONBLOCK) < 0) {
EPRINTLN("can't set O_NONBLOCK flag");
goto error;
}
/*
* The default ng_socket(4) buffer's size is too low.
* Calculate the minimum value between NG_SBUF_MAX_SIZE
* and kern.ipc.maxsockbuf.
*/
msbsz = sizeof(maxsbsz);
if (sysctlbyname("kern.ipc.maxsockbuf", &maxsbsz, &msbsz,
NULL, 0) < 0) {
EPRINTLN("can't get 'kern.ipc.maxsockbuf' value");
goto error;
}
/*
* We can't set the socket buffer size to kern.ipc.maxsockbuf value,
* as it takes into account the mbuf(9) overhead.
*/
maxsbsz = maxsbsz * MCLBYTES / (MSIZE + MCLBYTES);
sbsz = MIN(NG_SBUF_MAX_SIZE, maxsbsz);
if (setsockopt(be->fd, SOL_SOCKET, SO_SNDBUF, &sbsz,
sizeof(sbsz)) < 0) {
EPRINTLN("can't set TX buffer size");
goto error;
}
if (setsockopt(be->fd, SOL_SOCKET, SO_RCVBUF, &sbsz,
sizeof(sbsz)) < 0) {
EPRINTLN("can't set RX buffer size");
goto error;
}
#ifndef WITHOUT_CAPSICUM
cap_rights_init(&rights, CAP_EVENT, CAP_READ, CAP_WRITE);
if (caph_rights_limit(be->fd, &rights) == -1)
errx(EX_OSERR, "Unable to apply rights for sandbox");
#endif
memset(p->bbuf, 0, sizeof(p->bbuf));
p->bbuflen = 0;
p->mevp = mevent_add_disabled(be->fd, EVF_READ, cb, param);
if (p->mevp == NULL) {
EPRINTLN("Could not register event");
goto error;
}
return (0);
error:
tap_cleanup(be);
return (-1);
}
static struct net_backend ng_backend = {
.prefix = "netgraph",
.priv_size = sizeof(struct tap_priv),
.init = ng_init,
.cleanup = tap_cleanup,
.send = tap_send,
.peek_recvlen = tap_peek_recvlen,
.recv = tap_recv,
.recv_enable = tap_recv_enable,
.recv_disable = tap_recv_disable,
.get_cap = tap_get_cap,
.set_cap = tap_set_cap,
};
DATA_SET(net_backend_set, ng_backend);
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