freebsd-dev/sbin/ifconfig/ifgre.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

139 lines
3.8 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2008 Andrew Thompson. 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 THE AUTHOR ``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 HIS RELATIVES 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 MIND, 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/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <net/if_gre.h>
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include "ifconfig.h"
#define GREBITS "\020\01ENABLE_CSUM\02ENABLE_SEQ\03UDPENCAP"
static void
gre_status(if_ctx *ctx)
{
uint32_t opts = 0, port;
struct ifreq ifr = { .ifr_data = (caddr_t)&opts };
if (ioctl_ctx(ctx, GREGKEY, &ifr) == 0)
if (opts != 0)
printf("\tgrekey: 0x%x (%u)\n", opts, opts);
opts = 0;
if (ioctl_ctx(ctx, GREGOPTS, &ifr) != 0 || opts == 0)
return;
port = 0;
ifr.ifr_data = (caddr_t)&port;
if (ioctl_ctx_ifr(ctx, GREGPORT, &ifr) == 0 && port != 0)
printf("\tudpport: %u\n", port);
printb("\toptions", opts, GREBITS);
putchar('\n');
}
static void
setifgrekey(if_ctx *ctx, const char *val, int dummy __unused)
{
uint32_t grekey = strtol(val, NULL, 0);
struct ifreq ifr = { .ifr_data = (caddr_t)&grekey };
ifr.ifr_data = (caddr_t)&grekey;
if (ioctl_ctx_ifr(ctx, GRESKEY, &ifr) < 0)
warn("ioctl (set grekey)");
}
static void
setifgreport(if_ctx *ctx, const char *val, int dummy __unused)
{
uint32_t udpport = strtol(val, NULL, 0);
struct ifreq ifr = { .ifr_data = (caddr_t)&udpport };
if (ioctl_ctx_ifr(ctx, GRESPORT, &ifr) < 0)
warn("ioctl (set udpport)");
}
static void
setifgreopts(if_ctx *ctx, const char *val __unused, int d)
{
uint32_t opts;
struct ifreq ifr = { .ifr_data = (caddr_t)&opts };
if (ioctl_ctx_ifr(ctx, GREGOPTS, &ifr) == -1) {
warn("ioctl(GREGOPTS)");
return;
}
if (d < 0)
opts &= ~(-d);
else
opts |= d;
if (ioctl_ctx(ctx, GRESOPTS, &ifr) == -1) {
warn("ioctl(GIFSOPTS)");
return;
}
}
static struct cmd gre_cmds[] = {
DEF_CMD_ARG("grekey", setifgrekey),
DEF_CMD_ARG("udpport", setifgreport),
DEF_CMD("enable_csum", GRE_ENABLE_CSUM, setifgreopts),
DEF_CMD("-enable_csum",-GRE_ENABLE_CSUM,setifgreopts),
DEF_CMD("enable_seq", GRE_ENABLE_SEQ, setifgreopts),
DEF_CMD("-enable_seq",-GRE_ENABLE_SEQ, setifgreopts),
DEF_CMD("udpencap", GRE_UDPENCAP, setifgreopts),
DEF_CMD("-udpencap",-GRE_UDPENCAP, setifgreopts),
};
static struct afswtch af_gre = {
.af_name = "af_gre",
.af_af = AF_UNSPEC,
.af_other_status = gre_status,
};
static __constructor void
gre_ctor(void)
{
size_t i;
for (i = 0; i < nitems(gre_cmds); i++)
cmd_register(&gre_cmds[i]);
af_register(&af_gre);
}