freebsd-dev/sbin/ifconfig/ifbridge.c
Andrew Thompson 91f6764e93 Add support for creating span ports so that one can snoop bridged traffic
from another interface/machine/network.

Obtained from:	OpenBSD
MFC after:	2 weeks
2005-12-14 02:52:13 +00:00

566 lines
14 KiB
C

/*-
* Copyright 2001 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* 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.
*/
#ifndef lint
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#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/if_bridgevar.h>
#include <net/route.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
get_val(const char *cp, u_long *valp)
{
char *endptr;
u_long val;
errno = 0;
val = strtoul(cp, &endptr, 0);
if (cp[0] == '\0' || endptr[0] != '\0' || errno == ERANGE)
return (-1);
*valp = val;
return (0);
}
static int
do_cmd(int sock, u_long op, void *arg, size_t argsize, int set)
{
struct ifdrv ifd;
memset(&ifd, 0, sizeof(ifd));
strlcpy(ifd.ifd_name, ifr.ifr_name, sizeof(ifd.ifd_name));
ifd.ifd_cmd = op;
ifd.ifd_len = argsize;
ifd.ifd_data = arg;
return (ioctl(sock, set ? SIOCSDRVSPEC : SIOCGDRVSPEC, &ifd));
}
static void
do_bridgeflag(int sock, const char *ifs, int flag, int set)
{
struct ifbreq req;
strlcpy(req.ifbr_ifsname, ifs, sizeof(req.ifbr_ifsname));
if (do_cmd(sock, BRDGGIFFLGS, &req, sizeof(req), 0) < 0)
err(1, "unable to get bridge flags");
if (set)
req.ifbr_ifsflags |= flag;
else
req.ifbr_ifsflags &= ~flag;
if (do_cmd(sock, BRDGSIFFLGS, &req, sizeof(req), 1) < 0)
err(1, "unable to set bridge flags");
}
static void
bridge_interfaces(int s, const char *prefix)
{
static const char *stpstates[] = {
"disabled",
"listening",
"learning",
"forwarding",
"blocking",
};
struct ifbifconf bifc;
struct ifbreq *req;
char *inbuf = NULL, *ninbuf;
char *p, *pad;
int i, len = 8192;
pad = strdup(prefix);
if (pad == NULL)
err(1, "strdup");
/* replace the prefix with whitespace */
for (p = pad; *p != '\0'; p++) {
if(isprint(*p))
*p = ' ';
}
for (;;) {
ninbuf = realloc(inbuf, len);
if (ninbuf == NULL)
err(1, "unable to allocate interface buffer");
bifc.ifbic_len = len;
bifc.ifbic_buf = inbuf = ninbuf;
if (do_cmd(s, BRDGGIFS, &bifc, sizeof(bifc), 0) < 0)
err(1, "unable to get interface list");
if ((bifc.ifbic_len + sizeof(*req)) < len)
break;
len *= 2;
}
for (i = 0; i < bifc.ifbic_len / sizeof(*req); i++) {
req = bifc.ifbic_req + i;
printf("%s%s ", prefix, req->ifbr_ifsname);
printb("flags", req->ifbr_ifsflags, IFBIFBITS);
printf("\n");
if (req->ifbr_ifsflags & IFBIF_STP) {
printf("%s", pad);
printf("port %u priority %u",
req->ifbr_portno, req->ifbr_priority);
printf(" path cost %u", req->ifbr_path_cost);
if (req->ifbr_state <
sizeof(stpstates) / sizeof(stpstates[0]))
printf(" %s", stpstates[req->ifbr_state]);
else
printf(" <unknown state %d>",
req->ifbr_state);
printf("\n");
}
}
free(inbuf);
}
static void
bridge_addresses(int s, const char *prefix)
{
struct ifbaconf ifbac;
struct ifbareq *ifba;
char *inbuf = NULL, *ninbuf;
int i, len = 8192;
struct ether_addr ea;
for (;;) {
ninbuf = realloc(inbuf, len);
if (ninbuf == NULL)
err(1, "unable to allocate address buffer");
ifbac.ifbac_len = len;
ifbac.ifbac_buf = inbuf = ninbuf;
if (do_cmd(s, BRDGRTS, &ifbac, sizeof(ifbac), 0) < 0)
err(1, "unable to get address cache");
if ((ifbac.ifbac_len + sizeof(*ifba)) < len)
break;
len *= 2;
}
for (i = 0; i < ifbac.ifbac_len / sizeof(*ifba); i++) {
ifba = ifbac.ifbac_req + i;
memcpy(ea.octet, ifba->ifba_dst,
sizeof(ea.octet));
printf("%s%s %s %lu ", prefix, ether_ntoa(&ea),
ifba->ifba_ifsname, ifba->ifba_expire);
printb("flags", ifba->ifba_flags, IFBAFBITS);
printf("\n");
}
free(inbuf);
}
static void
bridge_status(int s)
{
struct ifbrparam param;
u_int16_t pri;
u_int8_t ht, fd, ma;
if (do_cmd(s, BRDGGPRI, &param, sizeof(param), 0) < 0)
return;
pri = param.ifbrp_prio;
if (do_cmd(s, BRDGGHT, &param, sizeof(param), 0) < 0)
return;
ht = param.ifbrp_hellotime;
if (do_cmd(s, BRDGGFD, &param, sizeof(param), 0) < 0)
return;
fd = param.ifbrp_fwddelay;
if (do_cmd(s, BRDGGMA, &param, sizeof(param), 0) < 0)
return;
ma = param.ifbrp_maxage;
printf("\tpriority %u hellotime %u fwddelay %u maxage %u\n",
pri, ht, fd, ma);
bridge_interfaces(s, "\tmember: ");
return;
}
static void
setbridge_add(const char *val, int d, int s, const struct afswtch *afp)
{
struct ifbreq req;
memset(&req, 0, sizeof(req));
strlcpy(req.ifbr_ifsname, val, sizeof(req.ifbr_ifsname));
if (do_cmd(s, BRDGADD, &req, sizeof(req), 1) < 0)
err(1, "BRDGADD %s", val);
}
static void
setbridge_delete(const char *val, int d, int s, const struct afswtch *afp)
{
struct ifbreq req;
memset(&req, 0, sizeof(req));
strlcpy(req.ifbr_ifsname, val, sizeof(req.ifbr_ifsname));
if (do_cmd(s, BRDGDEL, &req, sizeof(req), 1) < 0)
err(1, "BRDGDEL %s", val);
}
static void
setbridge_discover(const char *val, int d, int s, const struct afswtch *afp)
{
do_bridgeflag(s, val, IFBIF_DISCOVER, 1);
}
static void
unsetbridge_discover(const char *val, int d, int s, const struct afswtch *afp)
{
do_bridgeflag(s, val, IFBIF_DISCOVER, 0);
}
static void
setbridge_learn(const char *val, int d, int s, const struct afswtch *afp)
{
do_bridgeflag(s, val, IFBIF_LEARNING, 1);
}
static void
unsetbridge_learn(const char *val, int d, int s, const struct afswtch *afp)
{
do_bridgeflag(s, val, IFBIF_LEARNING, 0);
}
static void
setbridge_span(const char *val, int d, int s, const struct afswtch *afp)
{
struct ifbreq req;
memset(&req, 0, sizeof(req));
strlcpy(req.ifbr_ifsname, val, sizeof(req.ifbr_ifsname));
if (do_cmd(s, BRDGADDS, &req, sizeof(req), 1) < 0)
err(1, "BRDGADDS %s", val);
}
static void
unsetbridge_span(const char *val, int d, int s, const struct afswtch *afp)
{
struct ifbreq req;
memset(&req, 0, sizeof(req));
strlcpy(req.ifbr_ifsname, val, sizeof(req.ifbr_ifsname));
if (do_cmd(s, BRDGDELS, &req, sizeof(req), 1) < 0)
err(1, "BRDGDELS %s", val);
}
static void
setbridge_stp(const char *val, int d, int s, const struct afswtch *afp)
{
do_bridgeflag(s, val, IFBIF_STP, 1);
}
static void
unsetbridge_stp(const char *val, int d, int s, const struct afswtch *afp)
{
do_bridgeflag(s, val, IFBIF_STP, 0);
}
static void
setbridge_flush(const char *val, int d, int s, const struct afswtch *afp)
{
struct ifbreq req;
memset(&req, 0, sizeof(req));
req.ifbr_ifsflags = IFBF_FLUSHDYN;
if (do_cmd(s, BRDGFLUSH, &req, sizeof(req), 1) < 0)
err(1, "BRDGFLUSH");
}
static void
setbridge_flushall(const char *val, int d, int s, const struct afswtch *afp)
{
struct ifbreq req;
memset(&req, 0, sizeof(req));
req.ifbr_ifsflags = IFBF_FLUSHALL;
if (do_cmd(s, BRDGFLUSH, &req, sizeof(req), 1) < 0)
err(1, "BRDGFLUSH");
}
static void
setbridge_static(const char *val, const char *mac, int s,
const struct afswtch *afp)
{
struct ifbareq req;
struct ether_addr *ea;
memset(&req, 0, sizeof(req));
strlcpy(req.ifba_ifsname, val, sizeof(req.ifba_ifsname));
ea = ether_aton(mac);
if (ea == NULL)
errx(1, "%s: invalid address: %s", val, mac);
memcpy(req.ifba_dst, ea->octet, sizeof(req.ifba_dst));
req.ifba_flags = IFBAF_STATIC;
if (do_cmd(s, BRDGSADDR, &req, sizeof(req), 1) < 0)
err(1, "BRDGSADDR %s", val);
}
static void
setbridge_deladdr(const char *val, int d, int s, const struct afswtch *afp)
{
struct ifbareq req;
struct ether_addr *ea;
memset(&req, 0, sizeof(req));
ea = ether_aton(val);
if (ea == NULL)
errx(1, "invalid address: %s", val);
memcpy(req.ifba_dst, ea->octet, sizeof(req.ifba_dst));
if (do_cmd(s, BRDGDADDR, &req, sizeof(req), 1) < 0)
err(1, "BRDGDADDR %s", val);
}
static void
setbridge_addr(const char *val, int d, int s, const struct afswtch *afp)
{
bridge_addresses(s, "");
}
static void
setbridge_maxaddr(const char *arg, int d, int s, const struct afswtch *afp)
{
struct ifbrparam param;
u_long val;
if (get_val(arg, &val) < 0 || (val & ~0xffffffff) != 0)
errx(1, "invalid value: %s", arg);
param.ifbrp_csize = val & 0xffffffff;
if (do_cmd(s, BRDGSCACHE, &param, sizeof(param), 1) < 0)
err(1, "BRDGSCACHE %s", arg);
}
static void
setbridge_hellotime(const char *arg, int d, int s, const struct afswtch *afp)
{
struct ifbrparam param;
u_long val;
if (get_val(arg, &val) < 0 || (val & ~0xff) != 0)
errx(1, "invalid value: %s", arg);
param.ifbrp_hellotime = val & 0xff;
if (do_cmd(s, BRDGSHT, &param, sizeof(param), 1) < 0)
err(1, "BRDGSHT %s", arg);
}
static void
setbridge_fwddelay(const char *arg, int d, int s, const struct afswtch *afp)
{
struct ifbrparam param;
u_long val;
if (get_val(arg, &val) < 0 || (val & ~0xff) != 0)
errx(1, "invalid value: %s", arg);
param.ifbrp_fwddelay = val & 0xff;
if (do_cmd(s, BRDGSFD, &param, sizeof(param), 1) < 0)
err(1, "BRDGSFD %s", arg);
}
static void
setbridge_maxage(const char *arg, int d, int s, const struct afswtch *afp)
{
struct ifbrparam param;
u_long val;
if (get_val(arg, &val) < 0 || (val & ~0xff) != 0)
errx(1, "invalid value: %s", arg);
param.ifbrp_maxage = val & 0xff;
if (do_cmd(s, BRDGSMA, &param, sizeof(param), 1) < 0)
err(1, "BRDGSMA %s", arg);
}
static void
setbridge_priority(const char *arg, int d, int s, const struct afswtch *afp)
{
struct ifbrparam param;
u_long val;
if (get_val(arg, &val) < 0 || (val & ~0xffff) != 0)
errx(1, "invalid value: %s", arg);
param.ifbrp_prio = val & 0xffff;
if (do_cmd(s, BRDGSPRI, &param, sizeof(param), 1) < 0)
err(1, "BRDGSPRI %s", arg);
}
static void
setbridge_ifpriority(const char *ifn, const char *pri, int s,
const struct afswtch *afp)
{
struct ifbreq req;
u_long val;
memset(&req, 0, sizeof(req));
if (get_val(pri, &val) < 0 || (val & ~0xff) != 0)
errx(1, "invalid value: %s", pri);
strlcpy(req.ifbr_ifsname, ifn, sizeof(req.ifbr_ifsname));
req.ifbr_priority = val & 0xff;
if (do_cmd(s, BRDGSIFPRIO, &req, sizeof(req), 1) < 0)
err(1, "BRDGSIFPRIO %s", pri);
}
static void
setbridge_ifpathcost(const char *ifn, const char *cost, int s,
const struct afswtch *afp)
{
struct ifbreq req;
u_long val;
memset(&req, 0, sizeof(req));
if (get_val(cost, &val) < 0 || (val & ~0xff) != 0)
errx(1, "invalid value: %s", cost);
strlcpy(req.ifbr_ifsname, ifn, sizeof(req.ifbr_ifsname));
req.ifbr_path_cost = val & 0xffff;
if (do_cmd(s, BRDGSIFCOST, &req, sizeof(req), 1) < 0)
err(1, "BRDGSIFCOST %s", cost);
}
static void
setbridge_timeout(const char *arg, int d, int s, const struct afswtch *afp)
{
struct ifbrparam param;
u_long val;
if (get_val(arg, &val) < 0 || (val & ~0xffffffff) != 0)
errx(1, "invalid value: %s", arg);
param.ifbrp_ctime = val & 0xffffffff;
if (do_cmd(s, BRDGSTO, &param, sizeof(param), 1) < 0)
err(1, "BRDGSTO %s", arg);
}
static struct cmd bridge_cmds[] = {
DEF_CMD_ARG("addm", setbridge_add),
DEF_CMD_ARG("deletem", setbridge_delete),
DEF_CMD_ARG("discover", setbridge_discover),
DEF_CMD_ARG("-discover", unsetbridge_discover),
DEF_CMD_ARG("learn", setbridge_learn),
DEF_CMD_ARG("-learn", unsetbridge_learn),
DEF_CMD_ARG("span", setbridge_span),
DEF_CMD_ARG("-span", unsetbridge_span),
DEF_CMD_ARG("stp", setbridge_stp),
DEF_CMD_ARG("-stp", unsetbridge_stp),
DEF_CMD("flush", 0, setbridge_flush),
DEF_CMD("flushall", 0, setbridge_flushall),
DEF_CMD_ARG2("static", setbridge_static),
DEF_CMD_ARG("deladdr", setbridge_deladdr),
DEF_CMD("addr", 1, setbridge_addr),
DEF_CMD_ARG("maxaddr", setbridge_maxaddr),
DEF_CMD_ARG("hellotime", setbridge_hellotime),
DEF_CMD_ARG("fwddelay", setbridge_fwddelay),
DEF_CMD_ARG("maxage", setbridge_maxage),
DEF_CMD_ARG("priority", setbridge_priority),
DEF_CMD_ARG2("ifpriority", setbridge_ifpriority),
DEF_CMD_ARG2("ifpathcost", setbridge_ifpathcost),
DEF_CMD_ARG("timeout", setbridge_timeout),
};
static struct afswtch af_bridge = {
.af_name = "af_bridge",
.af_af = AF_UNSPEC,
.af_other_status = bridge_status,
};
static __constructor void
bridge_ctor(void)
{
#define N(a) (sizeof(a) / sizeof(a[0]))
int i;
for (i = 0; i < N(bridge_cmds); i++)
cmd_register(&bridge_cmds[i]);
af_register(&af_bridge);
#undef N
}