freebsd-dev/sbin/ifconfig/ifvxlan.c
Hans Petter Selasky 05952067bb Ensure consistent error messages from ifconfig(8).
If multiple threads are invoking "ifconfig XXX create" a race may occur
which can lead to two different error messages for the same error.

a) ifconfig: SIOCIFCREATE2: File exists
b) ifconfig: interface XXX already exists

This patch ensures ifconfig prints the same error code
for the same case.

Reviewed by:	imp@ and kib@
Differential Revision:	https://reviews.freebsd.org/D27380
MFC after:	1 week
Sponsored by:	Mellanox Technologies // NVIDIA Networking
2020-11-26 16:36:50 +00:00

646 lines
16 KiB
C

/*-
* Copyright (c) 2014, Bryan Venteicher <bryanv@FreeBSD.org>
* 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 unmodified, 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 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/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <netdb.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_vxlan.h>
#include <net/route.h>
#include <netinet/in.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 struct ifvxlanparam params = {
.vxlp_vni = VXLAN_VNI_MAX,
};
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;
bzero(&ifd, 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 int
vxlan_exists(int sock)
{
struct ifvxlancfg cfg;
bzero(&cfg, sizeof(cfg));
return (do_cmd(sock, VXLAN_CMD_GET_CONFIG, &cfg, sizeof(cfg), 0) != -1);
}
static void
vxlan_status(int s)
{
struct ifvxlancfg cfg;
char src[NI_MAXHOST], dst[NI_MAXHOST];
char srcport[NI_MAXSERV], dstport[NI_MAXSERV];
struct sockaddr *lsa, *rsa;
int vni, mc, ipv6;
bzero(&cfg, sizeof(cfg));
if (do_cmd(s, VXLAN_CMD_GET_CONFIG, &cfg, sizeof(cfg), 0) < 0)
return;
vni = cfg.vxlc_vni;
lsa = &cfg.vxlc_local_sa.sa;
rsa = &cfg.vxlc_remote_sa.sa;
ipv6 = rsa->sa_family == AF_INET6;
/* Just report nothing if the network identity isn't set yet. */
if (vni >= VXLAN_VNI_MAX)
return;
if (getnameinfo(lsa, lsa->sa_len, src, sizeof(src),
srcport, sizeof(srcport), NI_NUMERICHOST | NI_NUMERICSERV) != 0)
src[0] = srcport[0] = '\0';
if (getnameinfo(rsa, rsa->sa_len, dst, sizeof(dst),
dstport, sizeof(dstport), NI_NUMERICHOST | NI_NUMERICSERV) != 0)
dst[0] = dstport[0] = '\0';
if (!ipv6) {
struct sockaddr_in *sin = (struct sockaddr_in *)rsa;
mc = IN_MULTICAST(ntohl(sin->sin_addr.s_addr));
} else {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)rsa;
mc = IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr);
}
printf("\tvxlan vni %d", vni);
printf(" local %s%s%s:%s", ipv6 ? "[" : "", src, ipv6 ? "]" : "",
srcport);
printf(" %s %s%s%s:%s", mc ? "group" : "remote", ipv6 ? "[" : "",
dst, ipv6 ? "]" : "", dstport);
if (verbose) {
printf("\n\t\tconfig: ");
printf("%slearning portrange %d-%d ttl %d",
cfg.vxlc_learn ? "" : "no", cfg.vxlc_port_min,
cfg.vxlc_port_max, cfg.vxlc_ttl);
printf("\n\t\tftable: ");
printf("cnt %d max %d timeout %d",
cfg.vxlc_ftable_cnt, cfg.vxlc_ftable_max,
cfg.vxlc_ftable_timeout);
}
putchar('\n');
}
#define _LOCAL_ADDR46 \
(VXLAN_PARAM_WITH_LOCAL_ADDR4 | VXLAN_PARAM_WITH_LOCAL_ADDR6)
#define _REMOTE_ADDR46 \
(VXLAN_PARAM_WITH_REMOTE_ADDR4 | VXLAN_PARAM_WITH_REMOTE_ADDR6)
static void
vxlan_check_params(void)
{
if ((params.vxlp_with & _LOCAL_ADDR46) == _LOCAL_ADDR46)
errx(1, "cannot specify both local IPv4 and IPv6 addresses");
if ((params.vxlp_with & _REMOTE_ADDR46) == _REMOTE_ADDR46)
errx(1, "cannot specify both remote IPv4 and IPv6 addresses");
if ((params.vxlp_with & VXLAN_PARAM_WITH_LOCAL_ADDR4 &&
params.vxlp_with & VXLAN_PARAM_WITH_REMOTE_ADDR6) ||
(params.vxlp_with & VXLAN_PARAM_WITH_LOCAL_ADDR6 &&
params.vxlp_with & VXLAN_PARAM_WITH_REMOTE_ADDR4))
errx(1, "cannot mix IPv4 and IPv6 addresses");
}
#undef _LOCAL_ADDR46
#undef _REMOTE_ADDR46
static void
vxlan_cb(int s, void *arg)
{
}
static void
vxlan_create(int s, struct ifreq *ifr)
{
vxlan_check_params();
ifr->ifr_data = (caddr_t) &params;
ioctl_ifcreate(s, ifr);
}
static
DECL_CMD_FUNC(setvxlan_vni, arg, d)
{
struct ifvxlancmd cmd;
u_long val;
if (get_val(arg, &val) < 0 || val >= VXLAN_VNI_MAX)
errx(1, "invalid network identifier: %s", arg);
if (!vxlan_exists(s)) {
params.vxlp_with |= VXLAN_PARAM_WITH_VNI;
params.vxlp_vni = val;
return;
}
bzero(&cmd, sizeof(cmd));
cmd.vxlcmd_vni = val;
if (do_cmd(s, VXLAN_CMD_SET_VNI, &cmd, sizeof(cmd), 1) < 0)
err(1, "VXLAN_CMD_SET_VNI");
}
static
DECL_CMD_FUNC(setvxlan_local, addr, d)
{
struct ifvxlancmd cmd;
struct addrinfo *ai;
struct sockaddr *sa;
int error;
bzero(&cmd, sizeof(cmd));
if ((error = getaddrinfo(addr, NULL, NULL, &ai)) != 0)
errx(1, "error in parsing local address string: %s",
gai_strerror(error));
sa = ai->ai_addr;
switch (ai->ai_family) {
#ifdef INET
case AF_INET: {
struct sockaddr_in *sin = (struct sockaddr_in *)sa;
if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
errx(1, "local address cannot be multicast");
cmd.vxlcmd_sa.in4 = *sin;
break;
}
#endif
#ifdef INET6
case AF_INET6: {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
errx(1, "local address cannot be multicast");
cmd.vxlcmd_sa.in6 = *sin6;
break;
}
#endif
default:
errx(1, "local address %s not supported", addr);
}
freeaddrinfo(ai);
if (!vxlan_exists(s)) {
if (cmd.vxlcmd_sa.sa.sa_family == AF_INET) {
params.vxlp_with |= VXLAN_PARAM_WITH_LOCAL_ADDR4;
params.vxlp_local_sa.in4 = cmd.vxlcmd_sa.in4;
} else {
params.vxlp_with |= VXLAN_PARAM_WITH_LOCAL_ADDR6;
params.vxlp_local_sa.in6 = cmd.vxlcmd_sa.in6;
}
return;
}
if (do_cmd(s, VXLAN_CMD_SET_LOCAL_ADDR, &cmd, sizeof(cmd), 1) < 0)
err(1, "VXLAN_CMD_SET_LOCAL_ADDR");
}
static
DECL_CMD_FUNC(setvxlan_remote, addr, d)
{
struct ifvxlancmd cmd;
struct addrinfo *ai;
struct sockaddr *sa;
int error;
bzero(&cmd, sizeof(cmd));
if ((error = getaddrinfo(addr, NULL, NULL, &ai)) != 0)
errx(1, "error in parsing remote address string: %s",
gai_strerror(error));
sa = ai->ai_addr;
switch (ai->ai_family) {
#ifdef INET
case AF_INET: {
struct sockaddr_in *sin = (struct sockaddr_in *)sa;
if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
errx(1, "remote address cannot be multicast");
cmd.vxlcmd_sa.in4 = *sin;
break;
}
#endif
#ifdef INET6
case AF_INET6: {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
errx(1, "remote address cannot be multicast");
cmd.vxlcmd_sa.in6 = *sin6;
break;
}
#endif
default:
errx(1, "remote address %s not supported", addr);
}
freeaddrinfo(ai);
if (!vxlan_exists(s)) {
if (cmd.vxlcmd_sa.sa.sa_family == AF_INET) {
params.vxlp_with |= VXLAN_PARAM_WITH_REMOTE_ADDR4;
params.vxlp_remote_sa.in4 = cmd.vxlcmd_sa.in4;
} else {
params.vxlp_with |= VXLAN_PARAM_WITH_REMOTE_ADDR6;
params.vxlp_remote_sa.in6 = cmd.vxlcmd_sa.in6;
}
return;
}
if (do_cmd(s, VXLAN_CMD_SET_REMOTE_ADDR, &cmd, sizeof(cmd), 1) < 0)
err(1, "VXLAN_CMD_SET_REMOTE_ADDR");
}
static
DECL_CMD_FUNC(setvxlan_group, addr, d)
{
struct ifvxlancmd cmd;
struct addrinfo *ai;
struct sockaddr *sa;
int error;
bzero(&cmd, sizeof(cmd));
if ((error = getaddrinfo(addr, NULL, NULL, &ai)) != 0)
errx(1, "error in parsing group address string: %s",
gai_strerror(error));
sa = ai->ai_addr;
switch (ai->ai_family) {
#ifdef INET
case AF_INET: {
struct sockaddr_in *sin = (struct sockaddr_in *)sa;
if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
errx(1, "group address must be multicast");
cmd.vxlcmd_sa.in4 = *sin;
break;
}
#endif
#ifdef INET6
case AF_INET6: {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
errx(1, "group address must be multicast");
cmd.vxlcmd_sa.in6 = *sin6;
break;
}
#endif
default:
errx(1, "group address %s not supported", addr);
}
freeaddrinfo(ai);
if (!vxlan_exists(s)) {
if (cmd.vxlcmd_sa.sa.sa_family == AF_INET) {
params.vxlp_with |= VXLAN_PARAM_WITH_REMOTE_ADDR4;
params.vxlp_remote_sa.in4 = cmd.vxlcmd_sa.in4;
} else {
params.vxlp_with |= VXLAN_PARAM_WITH_REMOTE_ADDR6;
params.vxlp_remote_sa.in6 = cmd.vxlcmd_sa.in6;
}
return;
}
if (do_cmd(s, VXLAN_CMD_SET_REMOTE_ADDR, &cmd, sizeof(cmd), 1) < 0)
err(1, "VXLAN_CMD_SET_REMOTE_ADDR");
}
static
DECL_CMD_FUNC(setvxlan_local_port, arg, d)
{
struct ifvxlancmd cmd;
u_long val;
if (get_val(arg, &val) < 0 || val >= UINT16_MAX)
errx(1, "invalid local port: %s", arg);
if (!vxlan_exists(s)) {
params.vxlp_with |= VXLAN_PARAM_WITH_LOCAL_PORT;
params.vxlp_local_port = val;
return;
}
bzero(&cmd, sizeof(cmd));
cmd.vxlcmd_port = val;
if (do_cmd(s, VXLAN_CMD_SET_LOCAL_PORT, &cmd, sizeof(cmd), 1) < 0)
err(1, "VXLAN_CMD_SET_LOCAL_PORT");
}
static
DECL_CMD_FUNC(setvxlan_remote_port, arg, d)
{
struct ifvxlancmd cmd;
u_long val;
if (get_val(arg, &val) < 0 || val >= UINT16_MAX)
errx(1, "invalid remote port: %s", arg);
if (!vxlan_exists(s)) {
params.vxlp_with |= VXLAN_PARAM_WITH_REMOTE_PORT;
params.vxlp_remote_port = val;
return;
}
bzero(&cmd, sizeof(cmd));
cmd.vxlcmd_port = val;
if (do_cmd(s, VXLAN_CMD_SET_REMOTE_PORT, &cmd, sizeof(cmd), 1) < 0)
err(1, "VXLAN_CMD_SET_REMOTE_PORT");
}
static
DECL_CMD_FUNC2(setvxlan_port_range, arg1, arg2)
{
struct ifvxlancmd cmd;
u_long min, max;
if (get_val(arg1, &min) < 0 || min >= UINT16_MAX)
errx(1, "invalid port range minimum: %s", arg1);
if (get_val(arg2, &max) < 0 || max >= UINT16_MAX)
errx(1, "invalid port range maximum: %s", arg2);
if (max < min)
errx(1, "invalid port range");
if (!vxlan_exists(s)) {
params.vxlp_with |= VXLAN_PARAM_WITH_PORT_RANGE;
params.vxlp_min_port = min;
params.vxlp_max_port = max;
return;
}
bzero(&cmd, sizeof(cmd));
cmd.vxlcmd_port_min = min;
cmd.vxlcmd_port_max = max;
if (do_cmd(s, VXLAN_CMD_SET_PORT_RANGE, &cmd, sizeof(cmd), 1) < 0)
err(1, "VXLAN_CMD_SET_PORT_RANGE");
}
static
DECL_CMD_FUNC(setvxlan_timeout, arg, d)
{
struct ifvxlancmd cmd;
u_long val;
if (get_val(arg, &val) < 0 || (val & ~0xFFFFFFFF) != 0)
errx(1, "invalid timeout value: %s", arg);
if (!vxlan_exists(s)) {
params.vxlp_with |= VXLAN_PARAM_WITH_FTABLE_TIMEOUT;
params.vxlp_ftable_timeout = val & 0xFFFFFFFF;
return;
}
bzero(&cmd, sizeof(cmd));
cmd.vxlcmd_ftable_timeout = val & 0xFFFFFFFF;
if (do_cmd(s, VXLAN_CMD_SET_FTABLE_TIMEOUT, &cmd, sizeof(cmd), 1) < 0)
err(1, "VXLAN_CMD_SET_FTABLE_TIMEOUT");
}
static
DECL_CMD_FUNC(setvxlan_maxaddr, arg, d)
{
struct ifvxlancmd cmd;
u_long val;
if (get_val(arg, &val) < 0 || (val & ~0xFFFFFFFF) != 0)
errx(1, "invalid maxaddr value: %s", arg);
if (!vxlan_exists(s)) {
params.vxlp_with |= VXLAN_PARAM_WITH_FTABLE_MAX;
params.vxlp_ftable_max = val & 0xFFFFFFFF;
return;
}
bzero(&cmd, sizeof(cmd));
cmd.vxlcmd_ftable_max = val & 0xFFFFFFFF;
if (do_cmd(s, VXLAN_CMD_SET_FTABLE_MAX, &cmd, sizeof(cmd), 1) < 0)
err(1, "VXLAN_CMD_SET_FTABLE_MAX");
}
static
DECL_CMD_FUNC(setvxlan_dev, arg, d)
{
struct ifvxlancmd cmd;
if (!vxlan_exists(s)) {
params.vxlp_with |= VXLAN_PARAM_WITH_MULTICAST_IF;
strlcpy(params.vxlp_mc_ifname, arg,
sizeof(params.vxlp_mc_ifname));
return;
}
bzero(&cmd, sizeof(cmd));
strlcpy(cmd.vxlcmd_ifname, arg, sizeof(cmd.vxlcmd_ifname));
if (do_cmd(s, VXLAN_CMD_SET_MULTICAST_IF, &cmd, sizeof(cmd), 1) < 0)
err(1, "VXLAN_CMD_SET_MULTICAST_IF");
}
static
DECL_CMD_FUNC(setvxlan_ttl, arg, d)
{
struct ifvxlancmd cmd;
u_long val;
if (get_val(arg, &val) < 0 || val > 256)
errx(1, "invalid TTL value: %s", arg);
if (!vxlan_exists(s)) {
params.vxlp_with |= VXLAN_PARAM_WITH_TTL;
params.vxlp_ttl = val;
return;
}
bzero(&cmd, sizeof(cmd));
cmd.vxlcmd_ttl = val;
if (do_cmd(s, VXLAN_CMD_SET_TTL, &cmd, sizeof(cmd), 1) < 0)
err(1, "VXLAN_CMD_SET_TTL");
}
static
DECL_CMD_FUNC(setvxlan_learn, arg, d)
{
struct ifvxlancmd cmd;
if (!vxlan_exists(s)) {
params.vxlp_with |= VXLAN_PARAM_WITH_LEARN;
params.vxlp_learn = d;
return;
}
bzero(&cmd, sizeof(cmd));
if (d != 0)
cmd.vxlcmd_flags |= VXLAN_CMD_FLAG_LEARN;
if (do_cmd(s, VXLAN_CMD_SET_LEARN, &cmd, sizeof(cmd), 1) < 0)
err(1, "VXLAN_CMD_SET_LEARN");
}
static void
setvxlan_flush(const char *val, int d, int s, const struct afswtch *afp)
{
struct ifvxlancmd cmd;
bzero(&cmd, sizeof(cmd));
if (d != 0)
cmd.vxlcmd_flags |= VXLAN_CMD_FLAG_FLUSH_ALL;
if (do_cmd(s, VXLAN_CMD_FLUSH, &cmd, sizeof(cmd), 1) < 0)
err(1, "VXLAN_CMD_FLUSH");
}
static struct cmd vxlan_cmds[] = {
DEF_CLONE_CMD_ARG("vni", setvxlan_vni),
DEF_CLONE_CMD_ARG("vxlanid", setvxlan_vni),
DEF_CLONE_CMD_ARG("vxlanlocal", setvxlan_local),
DEF_CLONE_CMD_ARG("vxlanremote", setvxlan_remote),
DEF_CLONE_CMD_ARG("vxlangroup", setvxlan_group),
DEF_CLONE_CMD_ARG("vxlanlocalport", setvxlan_local_port),
DEF_CLONE_CMD_ARG("vxlanremoteport", setvxlan_remote_port),
DEF_CLONE_CMD_ARG2("vxlanportrange", setvxlan_port_range),
DEF_CLONE_CMD_ARG("vxlantimeout", setvxlan_timeout),
DEF_CLONE_CMD_ARG("vxlanmaxaddr", setvxlan_maxaddr),
DEF_CLONE_CMD_ARG("vxlandev", setvxlan_dev),
DEF_CLONE_CMD_ARG("vxlanttl", setvxlan_ttl),
DEF_CLONE_CMD("vxlanlearn", 1, setvxlan_learn),
DEF_CLONE_CMD("-vxlanlearn", 0, setvxlan_learn),
DEF_CMD_ARG("vni", setvxlan_vni),
DEF_CMD_ARG("vxlanid", setvxlan_vni),
DEF_CMD_ARG("vxlanlocal", setvxlan_local),
DEF_CMD_ARG("vxlanremote", setvxlan_remote),
DEF_CMD_ARG("vxlangroup", setvxlan_group),
DEF_CMD_ARG("vxlanlocalport", setvxlan_local_port),
DEF_CMD_ARG("vxlanremoteport", setvxlan_remote_port),
DEF_CMD_ARG2("vxlanportrange", setvxlan_port_range),
DEF_CMD_ARG("vxlantimeout", setvxlan_timeout),
DEF_CMD_ARG("vxlanmaxaddr", setvxlan_maxaddr),
DEF_CMD_ARG("vxlandev", setvxlan_dev),
DEF_CMD_ARG("vxlanttl", setvxlan_ttl),
DEF_CMD("vxlanlearn", 1, setvxlan_learn),
DEF_CMD("-vxlanlearn", 0, setvxlan_learn),
DEF_CMD("vxlanflush", 0, setvxlan_flush),
DEF_CMD("vxlanflushall", 1, setvxlan_flush),
DEF_CMD("vxlanhwcsum", IFCAP_VXLAN_HWCSUM, setifcap),
DEF_CMD("-vxlanhwcsum", -IFCAP_VXLAN_HWCSUM, setifcap),
DEF_CMD("vxlanhwtso", IFCAP_VXLAN_HWTSO, setifcap),
DEF_CMD("-vxlanhwtso", -IFCAP_VXLAN_HWTSO, setifcap),
};
static struct afswtch af_vxlan = {
.af_name = "af_vxlan",
.af_af = AF_UNSPEC,
.af_other_status = vxlan_status,
};
static __constructor void
vxlan_ctor(void)
{
size_t i;
for (i = 0; i < nitems(vxlan_cmds); i++)
cmd_register(&vxlan_cmds[i]);
af_register(&af_vxlan);
callback_register(vxlan_cb, NULL);
clone_setdefcallback_prefix("vxlan", vxlan_create);
}