freebsd-dev/sbin/ifconfig/ifstf.c
Alexander V. Chernikov 7fa282e616 ifconfig: remove (most of) the usages of global 'struct ifreq ifr'.
It is hard to reason about the contents of 'ifr' at any given time
as nearly every function sets random fields or pointers in this
structure.
Use local on-stack clean 'struct ifreq' for each function instead.

Reviewed by: kp
Differential Revision: https://reviews.freebsd.org/D40534
MFC after:	2 weeks
2023-06-16 07:19:21 +00:00

149 lines
3.8 KiB
C

/*-
* Copyright 2013 Ermal Luci
* All rights reserved.
*
* 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 WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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.
*/
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <stdlib.h>
#include <unistd.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <sys/mbuf.h>
#include <net/if_stf.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <err.h>
#include <errno.h>
#include "ifconfig.h"
static int
do_cmd(if_ctx *ctx, u_long op, void *arg, size_t argsize, int set)
{
struct ifdrv ifd = {};
strlcpy(ifd.ifd_name, ctx->ifname, sizeof(ifd.ifd_name));
ifd.ifd_cmd = op;
ifd.ifd_len = argsize;
ifd.ifd_data = arg;
return (ioctl_ctx(ctx, set ? SIOCSDRVSPEC : SIOCGDRVSPEC, &ifd));
}
static void
stf_status(if_ctx *ctx)
{
struct stfv4args param;
if (do_cmd(ctx, STF6RD_GV4NET, &param, sizeof(param), 0) < 0)
return;
printf("\tv4net %s/%d -> ", inet_ntoa(param.srcv4_addr),
param.v4_prefixlen ? param.v4_prefixlen : 32);
printf("tv4br %s\n", inet_ntoa(param.braddr));
}
static void
setstf_br(if_ctx *ctx, const char *val, int d __unused)
{
struct stfv4args req;
struct sockaddr_in sin;
memset(&req, 0, sizeof(req));
sin.sin_len = sizeof(sin);
sin.sin_family = AF_INET;
if (!inet_aton(val, &sin.sin_addr))
errx(1, "%s: bad value", val);
req.braddr = sin.sin_addr;
if (do_cmd(ctx, STF6RD_SBR, &req, sizeof(req), 1) < 0)
err(1, "STF6RD_SBR%s", val);
}
static void
setstf_set(if_ctx *ctx, const char *val, int d __unused)
{
struct stfv4args req;
struct sockaddr_in sin;
const char *errstr;
char *p = NULL;
memset(&req, 0, sizeof(req));
sin.sin_len = sizeof(sin);
sin.sin_family = AF_INET;
p = strrchr(val, '/');
if (p == NULL)
errx(2, "Wrong argument given");
*p = '\0';
req.v4_prefixlen = (int)strtonum(p + 1, 0, 32, &errstr);
if (errstr != NULL || req.v4_prefixlen == 0) {
*p = '/';
errx(1, "%s: bad value (prefix length %s)", val, errstr);
}
if (!inet_aton(val, &sin.sin_addr))
errx(1, "%s: bad value", val);
memcpy(&req.srcv4_addr, &sin.sin_addr, sizeof(req.srcv4_addr));
if (do_cmd(ctx, STF6RD_SV4NET, &req, sizeof(req), 1) < 0)
err(1, "STF6RD_SV4NET %s", val);
}
static struct cmd stf_cmds[] = {
DEF_CMD_ARG("stfv4net", setstf_set),
DEF_CMD_ARG("stfv4br", setstf_br),
};
static struct afswtch af_stf = {
.af_name = "af_stf",
.af_af = AF_UNSPEC,
.af_other_status = stf_status,
};
static __constructor void
stf_ctor(void)
{
for (size_t i = 0; i < nitems(stf_cmds); i++)
cmd_register(&stf_cmds[i]);
af_register(&af_stf);
}