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Tue Feb 14 16:23:25 IST 2007 Mark McLoughlin <markmc@redhat.com>

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* qemud/iptables.[ch]: add code for managing iptables
        rules.

        * qemud/Makefile.am: add iptables.[ch].

        * qemud/qemud.c: add and remove iptables rules as
        appropriate.

        * qemud/conf.c: when starting a guess, add a rule
        allowing it to forward packets across the networks
        bridge.

        * qemud/internal.h: add iptables context ptr

        * configure.in: add --with-iptables-dir and
        --with-iptables-prefix to allow us to put our rules
        in a chain with the given prefix and save the rules
        in files in the given dir so as to integrate with
        the proposed "service iptables restart" solution
        in:

           https://bugzilla.redhat.com/227011
This commit is contained in:
Mark McLoughlin 2007-02-14 16:26:42 +00:00
parent e89a1c33f5
commit 3ea88b568d
8 changed files with 976 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
ChangeLog
View File

@ -1,3 +1,28 @@
Tue Feb 14 16:23:25 IST 2007 Mark McLoughlin <markmc@redhat.com>
* qemud/iptables.[ch]: add code for managing iptables
rules.
* qemud/Makefile.am: add iptables.[ch].
* qemud/qemud.c: add and remove iptables rules as
appropriate.
* qemud/conf.c: when starting a guess, add a rule
allowing it to forward packets across the networks
bridge.
* qemud/internal.h: add iptables context ptr
* configure.in: add --with-iptables-dir and
--with-iptables-prefix to allow us to put our rules
in a chain with the given prefix and save the rules
in files in the given dir so as to integrate with
the proposed "service iptables restart" solution
in:
https://bugzilla.redhat.com/227011
Tue Feb 14 16:21:18 IST 2007 Mark McLoughlin <markmc@redhat.com>
* src/xml.c: with <interface type="network"> connect the

25
configure.in
View File

@ -78,6 +78,31 @@ dnl
CFLAGS="-g -O -W -Wformat -Wunused -Wimplicit -Wreturn-type -Wswitch -Wcomment -Wtrigraphs -Wformat -Wchar-subscripts -Wuninitialized -Wparentheses -Wshadow -Wpointer-arith -Wcast-align -Wwrite-strings -Waggregate-return -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Winline -Wredundant-decls -Wall"
fi
dnl
dnl allow the creation of iptables rules in chains with a
dnl specific prefix rather than in the standard toplevel chains
dnl
AC_ARG_WITH(iptables-prefix,
AC_HELP_STRING([--with-iptables-prefix=prefix],
[prefix used for iptables chains, default is to use standard toplevel chains]),
[IPTABLES_PREFIX=$withval])
AC_DEFINE_UNQUOTED(IPTABLES_PREFIX, "$IPTABLES_PREFIX", [prefix used for iptables chains])
dnl
dnl also support saving the various chains to files
dnl in e.g. /etc/sysconfig/iptables.d
dnl
AC_ARG_WITH(iptables-dir,
AC_HELP_STRING([--with-iptables-dir=path],
[directory used to save iptables chains, defaults to not saving]),
[IPTABLES_DIR=$withval])
if test x"$IPTABLES_DIR" != "x"; then
AC_DEFINE_UNQUOTED(IPTABLES_DIR, "$IPTABLES_DIR", [directory used for saving iptables chains])
fi
AC_PATH_PROG(IPTABLES_PATH, iptables, /sbin/iptables)
AC_DEFINE_UNQUOTED(IPTABLES_PATH, "$IPTABLES_PATH", [path to iptables binary])
dnl
dnl Specify the xen-distribution directory to be able to compile on a
dnl non-xenified host

3
qemud/Makefile.am
View File

@ -8,7 +8,8 @@ libvirt_qemud_SOURCES = qemud.c internal.h protocol.h \
driver.c driver.h \
dispatch.c dispatch.h \
conf.c conf.h \
bridge.c bridge.h
bridge.c bridge.h \
iptables.c iptables.h
#-D_XOPEN_SOURCE=600 -D_XOPEN_SOURCE_EXTENDED=1 -D_POSIX_C_SOURCE=199506L
libvirt_qemud_CFLAGS = \
-I$(top_srcdir)/include -I$(top_builddir)/include $(LIBXML_CFLAGS) \

9
qemud/conf.c
View File

@ -43,6 +43,7 @@
#include "internal.h"
#include "conf.h"
#include "driver.h"
#include "iptables.h"
static int qemudParseUUID(const char *uuid,
unsigned char *rawuuid) {
@ -860,6 +861,13 @@ qemudNetworkIfaceConnect(struct qemud_server *server,
goto error;
}
if ((err = iptablesAddPhysdevForward(server->iptables, net->dst.network.tapifname))) {
qemudReportError(server, VIR_ERR_INTERNAL_ERROR,
"Failed to add iptables rule to allow bridging from '%s' :%s",
net->dst.network.tapifname, strerror(err));
goto error;
}
snprintf(tapfdstr, sizeof(tapfdstr), "tap,fd=%d,script=", tapfd);
if (!(retval = strdup(tapfdstr)))
@ -875,6 +883,7 @@ qemudNetworkIfaceConnect(struct qemud_server *server,
return retval;
no_memory:
iptablesRemovePhysdevForward(server->iptables, net->dst.network.tapifname);
qemudReportError(server, VIR_ERR_NO_MEMORY, "tapfds");
error:
if (retval)

2
qemud/internal.h
View File

@ -31,6 +31,7 @@
#include "protocol.h"
#include "bridge.h"
#include "iptables.h"
#ifdef __GNUC__
#ifdef HAVE_ANSIDECL_H
@ -283,6 +284,7 @@ struct qemud_server {
int ninactivenetworks;
struct qemud_network *inactivenetworks;
brControl *brctl;
iptablesContext *iptables;
char configDir[PATH_MAX];
char networkConfigDir[PATH_MAX];
char errorMessage[QEMUD_MAX_ERROR_LEN];

699
qemud/iptables.c Normal file
View File

@ -0,0 +1,699 @@
/*
* Copyright (C) 2007 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Authors:
* Mark McLoughlin <markmc@redhat.com>
*/
#include <config.h>
#include "iptables.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <unistd.h>
#include <fcntl.h>
#include <paths.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
enum {
ADD = 0,
REMOVE
};
enum {
WITH_ERRORS = 0,
NO_ERRORS
};
typedef struct
{
char *table;
char *chain;
#ifdef IPTABLES_DIR
char dir[PATH_MAX];
char path[PATH_MAX];
int nrules;
char **rules;
#endif /* IPTABLES_DIR */
} iptRules;
struct _iptablesContext
{
iptRules *input_filter;
iptRules *forward_filter;
iptRules *nat_postrouting;
};
#ifdef IPTABLES_DIR
static int
writeRules(const char *path,
char * const *rules,
int nrules)
{
char tmp[PATH_MAX];
FILE *f;
int istmp;
int i;
if (nrules == 0 && unlink(path) == 0)
return 0;
if (snprintf(tmp, PATH_MAX, "%s.new", path) >= PATH_MAX)
return EINVAL;
istmp = 1;
if (!(f = fopen(tmp, "w"))) {
istmp = 0;
if (!(f = fopen(path, "w")))
return errno;
}
for (i = 0; i < nrules; i++) {
if (fputs(rules[i], f) == EOF ||
fputc('\n', f) == EOF) {
fclose(f);
if (istmp)
unlink(tmp);
return errno;
}
}
fclose(f);
if (istmp && rename(tmp, path) < 0) {
unlink(tmp);
return errno;
}
if (istmp)
unlink(tmp);
return 0;
}
static int
ensureDir(const char *path)
{
struct stat st;
char parent[PATH_MAX];
char *p;
int err;
if (stat(path, &st) >= 0)
return 0;
strncpy(parent, path, PATH_MAX);
parent[PATH_MAX - 1] = '\0';
if (!(p = strrchr(parent, '/')))
return EINVAL;
if (p == parent)
return EPERM;
*p = '\0';
if ((err = ensureDir(parent)))
return err;
if (mkdir(path, 0700) < 0 && errno != EEXIST)
return errno;
return 0;
}
static int
buildDir(const char *table,
char *path,
int maxlen)
{
if (snprintf(path, maxlen, IPTABLES_DIR "/%s", table) >= maxlen)
return EINVAL;
else
return 0;
}
static int
buildPath(const char *table,
const char *chain,
char *path,
int maxlen)
{
if (snprintf(path, maxlen, IPTABLES_DIR "/%s/%s.chain", table, chain) >= maxlen)
return EINVAL;
else
return 0;
}
static int
iptRulesAppend(iptRules *rules,
const char *rule)
{
char **r;
int err;
if (!(r = (char **)realloc(rules->rules, sizeof(char *) * (rules->nrules+1))))
return ENOMEM;
rules->rules = r;
if (!(rules->rules[rules->nrules] = strdup(rule)))
return ENOMEM;
rules->nrules++;
if ((err = ensureDir(rules->dir)))
return err;
if ((err = writeRules(rules->path, rules->rules, rules->nrules)))
return err;
return 0;
}
static int
iptRulesRemove(iptRules *rules,
const char *rule)
{
int i;
int err;
for (i = 0; i < rules->nrules; i++)
if (!strcmp(rules->rules[i], rule))
break;
if (i >= rules->nrules)
return EINVAL;
free(rules->rules[i]);
memmove(&rules->rules[i],
&rules->rules[i+1],
(rules->nrules - i - 1) * sizeof (char *));
rules->nrules--;
if ((err = writeRules(rules->path, rules->rules, rules->nrules)))
return err;
return 0;
}
#endif /* IPTABLES_DIR */
static void
iptRulesFree(iptRules *rules)
{
if (rules->table) {
free(rules->chain);
rules->chain = NULL;
}
if (rules->chain) {
free(rules->chain);
rules->chain = NULL;
}
#ifdef IPTABLES_DIR
{
int i;
rules->dir[0] = '\0';
rules->path[0] = '\0';
for (i = 0; i < rules->nrules; i++) {
free(rules->rules[i]);
rules->rules[i] = NULL;
}
rules->nrules = 0;
if (rules->rules) {
free(rules->rules);
rules->rules = NULL;
}
}
#endif /* IPTABLES_DIR */
free(rules);
}
static iptRules *
iptRulesNew(const char *table,
const char *chain)
{
iptRules *rules;
if (!(rules = (iptRules *)malloc(sizeof (iptRules))))
return NULL;
memset (rules, 0, sizeof (iptRules));
if (!(rules->table = strdup(table)))
goto error;
if (!(rules->chain = strdup(chain)))
goto error;
#ifdef IPTABLES_DIR
if (buildDir(table, rules->dir, sizeof(rules->dir)))
goto error;
if (buildPath(table, chain, rules->path, sizeof(rules->path)))
goto error;
rules->rules = NULL;
rules->nrules = 0;
#endif /* IPTABLES_DIR */
return rules;
error:
iptRulesFree(rules);
return NULL;
}
static int
iptablesSpawn(int errors, char * const *argv)
{
pid_t pid, ret;
int status;
int null = -1;
if (errors == NO_ERRORS && (null = open(_PATH_DEVNULL, O_RDONLY)) < 0)
return errno;
pid = fork();
if (pid == -1) {
if (errors == NO_ERRORS)
close(null);
return errno;
}
if (pid == 0) { /* child */
int i, open_max = sysconf(_SC_OPEN_MAX);
for (i = 0; i < open_max; i++) {
if (i != STDOUT_FILENO &&
i != STDERR_FILENO &&
i != STDIN_FILENO)
close(i);
else if (errors == NO_ERRORS)
dup2(null, i);
}
execvp(argv[0], argv);
_exit (1);
}
if (errors == NO_ERRORS)
close(null);
while ((ret = waitpid(pid, &status, 0) == -1) && errno == EINTR);
if (ret == -1)
return errno;
if (errors == NO_ERRORS)
return 0;
else
return (WIFEXITED(status) && WEXITSTATUS(status) == 0) ? 0 : EINVAL;
}
static int
iptablesAddRemoveChain(iptRules *rules, int action)
{
char **argv;
int retval = ENOMEM;
int n;
n = 1 + /* /sbin/iptables */
2 + /* --table foo */
2; /* --new-chain bar */
if (!(argv = (char **)malloc(sizeof(char *) * (n+1))))
goto error;
memset(argv, 0, sizeof(char *) * (n + 1));
n = 0;
if (!(argv[n++] = strdup(IPTABLES_PATH)))
goto error;
if (!(argv[n++] = strdup("--table")))
goto error;
if (!(argv[n++] = strdup(rules->table)))
goto error;
if (!(argv[n++] = strdup(action == ADD ? "--new-chain" : "--delete-chain")))
goto error;
if (!(argv[n++] = strdup(rules->chain)))
goto error;
retval = iptablesSpawn(NO_ERRORS, argv);
error:
if (argv) {
n = 0;
while (argv[n])
free(argv[n++]);
free(argv);
}
return retval;
}
static int
iptablesAddRemoveRule(iptRules *rules, int action, const char *arg, ...)
{
va_list args;
int retval = ENOMEM;
char **argv;
char *rule = NULL, *p;
const char *s;
int n, rulelen;
n = 1 + /* /sbin/iptables */
2 + /* --table foo */
2 + /* --insert bar */
1; /* arg */
rulelen = strlen(arg) + 1;
va_start(args, arg);
while ((s = va_arg(args, const char *))) {
n++;
rulelen += strlen(s) + 1;
}
va_end(args);
if (!(argv = (char **)malloc(sizeof(char *) * (n + 1))))
goto error;
if (!(rule = (char *)malloc(rulelen)))
goto error;
memset(argv, 0, sizeof(char *) * (n + 1));
n = 0;
if (!(argv[n++] = strdup(IPTABLES_PATH)))
goto error;
if (!(argv[n++] = strdup("--table")))
goto error;
if (!(argv[n++] = strdup(rules->table)))
goto error;
if (!(argv[n++] = strdup(action == ADD ? "--insert" : "--delete")))
goto error;
if (!(argv[n++] = strdup(rules->chain)))
goto error;
if (!(argv[n++] = strdup(arg)))
goto error;
p = strcpy(rule, arg);
p += strlen(arg);
va_start(args, arg);
while ((s = va_arg(args, const char *))) {
if (!(argv[n++] = strdup(s)))
goto error;
*(p++) = ' ';
strcpy(p, s);
p += strlen(s);
}
va_end(args);
*p = '\0';
if (action == ADD &&
(retval = iptablesAddRemoveChain(rules, action)))
goto error;
if ((retval = iptablesSpawn(WITH_ERRORS, argv)))
goto error;
if (action == REMOVE &&
(retval = iptablesAddRemoveChain(rules, action)))
goto error;
#ifdef IPTABLES_DIR
if (action == ADD)
retval = iptRulesAppend(rules, rule);
else
retval = iptRulesRemove(rules, rule);
#endif /* IPTABLES_DIR */
error:
if (rule)
free(rule);
if (argv) {
n = 0;
while (argv[n])
free(argv[n++]);
free(argv);
}
return retval;
}
iptablesContext *
iptablesContextNew(void)
{
iptablesContext *ctx;
if (!(ctx = (iptablesContext *) malloc(sizeof (iptablesContext))))
return NULL;
if (!(ctx->input_filter = iptRulesNew("filter", IPTABLES_PREFIX "INPUT")))
goto error;
if (!(ctx->forward_filter = iptRulesNew("filter", IPTABLES_PREFIX "FORWARD")))
goto error;
if (!(ctx->nat_postrouting = iptRulesNew("nat", IPTABLES_PREFIX "POSTROUTING")))
goto error;
return ctx;
error:
iptablesContextFree(ctx);
return NULL;
}
void
iptablesContextFree(iptablesContext *ctx)
{
iptRulesFree(ctx->input_filter);
iptRulesFree(ctx->forward_filter);
iptRulesFree(ctx->nat_postrouting);
free(ctx);
}
static int
iptablesInput(iptablesContext *ctx,
const char *iface,
int port,
int action,
int tcp)
{
char portstr[32];
int ret;
snprintf(portstr, sizeof(portstr), "%d", port);
portstr[sizeof(portstr) - 1] = '\0';
ret = iptablesAddRemoveRule(ctx->input_filter,
action,
"--in-interface", iface,
"--protocol", tcp ? "tcp" : "udp",
"--destination-port", portstr,
"--jump", "ACCEPT",
NULL);
return ret;
}
int
iptablesAddTcpInput(iptablesContext *ctx,
const char *iface,
int port)
{
return iptablesInput(ctx, iface, port, ADD, 1);
}
int
iptablesRemoveTcpInput(iptablesContext *ctx,
const char *iface,
int port)
{
return iptablesInput(ctx, iface, port, REMOVE, 1);
}
int
iptablesAddUdpInput(iptablesContext *ctx,
const char *iface,
int port)
{
return iptablesInput(ctx, iface, port, ADD, 0);
}
int
iptablesRemoveUdpInput(iptablesContext *ctx,
const char *iface,
int port)
{
return iptablesInput(ctx, iface, port, REMOVE, 0);
}
static int
iptablesPhysdevForward(iptablesContext *ctx,
const char *iface,
int action)
{
return iptablesAddRemoveRule(ctx->forward_filter,
action,
"--match", "physdev",
"--physdev-in", iface,
"--jump", "ACCEPT",
NULL);
}
int
iptablesAddPhysdevForward(iptablesContext *ctx,
const char *iface)
{
return iptablesPhysdevForward(ctx, iface, ADD);
}
int
iptablesRemovePhysdevForward(iptablesContext *ctx,
const char *iface)
{
return iptablesPhysdevForward(ctx, iface, REMOVE);
}
static int
iptablesInterfaceForward(iptablesContext *ctx,
const char *iface,
int action)
{
return iptablesAddRemoveRule(ctx->forward_filter,
action,
"--in-interface", iface,
"--jump", "ACCEPT",
NULL);
}
int
iptablesAddInterfaceForward(iptablesContext *ctx,
const char *iface)
{
return iptablesInterfaceForward(ctx, iface, ADD);
}
int
iptablesRemoveInterfaceForward(iptablesContext *ctx,
const char *iface)
{
return iptablesInterfaceForward(ctx, iface, REMOVE);
}
static int
iptablesStateForward(iptablesContext *ctx,
const char *iface,
int action)
{
return iptablesAddRemoveRule(ctx->forward_filter,
action,
"--out-interface", iface,
"--match", "state",
"--state", "ESTABLISHED,RELATED",
"--jump", "ACCEPT",
NULL);
}
int
iptablesAddStateForward(iptablesContext *ctx,
const char *iface)
{
return iptablesStateForward(ctx, iface, ADD);
}
int
iptablesRemoveStateForward(iptablesContext *ctx,
const char *iface)
{
return iptablesStateForward(ctx, iface, REMOVE);
}
static int
iptablesNonBridgedMasq(iptablesContext *ctx,
int action)
{
return iptablesAddRemoveRule(ctx->nat_postrouting,
action,
"--match", "physdev",
"!", "--physdev-is-bridged",
"--jump", "MASQUERADE",
NULL);
}
int
iptablesAddNonBridgedMasq(iptablesContext *ctx)
{
return iptablesNonBridgedMasq(ctx, ADD);
}
int
iptablesRemoveNonBridgedMasq(iptablesContext *ctx)
{
return iptablesNonBridgedMasq(ctx, REMOVE);
}
/*
* Local variables:
* indent-tabs-mode: nil
* c-indent-level: 4
* c-basic-offset: 4
* tab-width: 4
* End:
*/

71
qemud/iptables.h Normal file
View File

@ -0,0 +1,71 @@
/*
* Copyright (C) 2007 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Authors:
* Mark McLoughlin <markmc@redhat.com>
*/
#ifndef __QEMUD_IPTABLES_H__
#define __QEMUD_IPTABLES_H__
typedef struct _iptablesContext iptablesContext;
iptablesContext *iptablesContextNew (void);
void iptablesContextFree (iptablesContext *ctx);
int iptablesAddTcpInput (iptablesContext *ctx,
const char *iface,
int port);
int iptablesRemoveTcpInput (iptablesContext *ctx,
const char *iface,
int port);
int iptablesAddUdpInput (iptablesContext *ctx,
const char *iface,
int port);
int iptablesRemoveUdpInput (iptablesContext *ctx,
const char *iface,
int port);
int iptablesAddPhysdevForward (iptablesContext *ctx,
const char *iface);
int iptablesRemovePhysdevForward (iptablesContext *ctx,
const char *iface);
int iptablesAddInterfaceForward (iptablesContext *ctx,
const char *iface);
int iptablesRemoveInterfaceForward (iptablesContext *ctx,
const char *iface);
int iptablesAddStateForward (iptablesContext *ctx,
const char *iface);
int iptablesRemoveStateForward (iptablesContext *ctx,
const char *iface);
int iptablesAddNonBridgedMasq (iptablesContext *ctx);
int iptablesRemoveNonBridgedMasq (iptablesContext *ctx);
#endif /* __QEMUD_IPTABLES_H__ */
/*
* Local variables:
* indent-tabs-mode: nil
* c-indent-level: 4
* c-basic-offset: 4
* tab-width: 4
* End:
*/

147
qemud/qemud.c
View File

@ -50,6 +50,7 @@
#include "dispatch.h"
#include "driver.h"
#include "conf.h"
#include "iptables.h"
static void reapchild(int sig ATTRIBUTE_UNUSED) {
/* We explicitly waitpid the child later */
@ -659,11 +660,10 @@ static int qemudVMData(struct qemud_server *server ATTRIBUTE_UNUSED,
}
static void
qemudNetworkIfaceDisconnect(struct qemud_server *server ATTRIBUTE_UNUSED,
qemudNetworkIfaceDisconnect(struct qemud_server *server,
struct qemud_vm *vm ATTRIBUTE_UNUSED,
struct qemud_vm_net_def *net) {
/* FIXME: will be needed to remove iptables rules */
net = NULL;
iptablesRemovePhysdevForward(server->iptables, net->dst.network.tapifname);
}
int qemudShutdownVMDaemon(struct qemud_server *server, struct qemud_vm *vm) {
@ -845,6 +845,129 @@ dhcpStartDhcpDaemon(struct qemud_server *server,
return ret;
}
static int
qemudAddIptablesRules(struct qemud_server *server,
struct qemud_network *network) {
int err;
if (!server->iptables && !(server->iptables = iptablesContextNew())) {
qemudReportError(server, VIR_ERR_NO_MEMORY, "iptables support");
return 1;
}
/* allow bridging from the bridge interface itself */
if ((err = iptablesAddPhysdevForward(server->iptables, network->bridge))) {
qemudReportError(server, VIR_ERR_INTERNAL_ERROR,
"failed to add iptables rule to allow bridging from '%s' : %s\n",
network->bridge, strerror(err));
goto err1;
}
/* allow forwarding packets from the bridge interface */
if ((err = iptablesAddInterfaceForward(server->iptables, network->bridge))) {
qemudReportError(server, VIR_ERR_INTERNAL_ERROR,
"failed to add iptables rule to allow forwarding from '%s' : %s\n",
network->bridge, strerror(err));
goto err2;
}
/* allow forwarding packets to the bridge interface if they are part of an existing connection */
if ((err = iptablesAddStateForward(server->iptables, network->bridge))) {
qemudReportError(server, VIR_ERR_INTERNAL_ERROR,
"failed to add iptables rule to allow forwarding to '%s' : %s\n",
network->bridge, strerror(err));
goto err3;
}
/* enable masquerading */
if ((err = iptablesAddNonBridgedMasq(server->iptables))) {
qemudReportError(server, VIR_ERR_INTERNAL_ERROR,
"failed to add iptables rule to enable masquerading : %s\n",
strerror(err));
goto err4;
}
/* allow DHCP requests through to dnsmasq */
if ((err = iptablesAddTcpInput(server->iptables, network->bridge, 67))) {
qemudReportError(server, VIR_ERR_INTERNAL_ERROR,
"failed to add iptables rule to allow DHCP requests from '%s' : %s\n",
network->bridge, strerror(err));
goto err5;
}
if ((err = iptablesAddUdpInput(server->iptables, network->bridge, 67))) {
qemudReportError(server, VIR_ERR_INTERNAL_ERROR,
"failed to add iptables rule to allow DHCP requests from '%s' : %s\n",
network->bridge, strerror(err));
goto err6;
}
/* allow DNS requests through to dnsmasq */
if ((err = iptablesAddTcpInput(server->iptables, network->bridge, 53))) {
qemudReportError(server, VIR_ERR_INTERNAL_ERROR,
"failed to add iptables rule to allow DNS requests from '%s' : %s\n",
network->bridge, strerror(err));
goto err7;
}
if ((err = iptablesAddUdpInput(server->iptables, network->bridge, 53))) {
qemudReportError(server, VIR_ERR_INTERNAL_ERROR,
"failed to add iptables rule to allow DNS requests from '%s' : %s\n",
network->bridge, strerror(err));
goto err8;
}
return 1;
err8:
iptablesRemoveTcpInput(server->iptables, network->bridge, 53);
err7:
iptablesRemoveUdpInput(server->iptables, network->bridge, 67);
err6:
iptablesRemoveTcpInput(server->iptables, network->bridge, 67);
err5:
iptablesRemoveNonBridgedMasq(server->iptables);
err4:
iptablesRemoveStateForward(server->iptables, network->bridge);
err3:
iptablesRemoveInterfaceForward(server->iptables, network->bridge);
err2:
iptablesRemovePhysdevForward(server->iptables, network->bridge);
err1:
return 0;
}
static void
qemudRemoveIptablesRules(struct qemud_server *server,
struct qemud_network *network) {
iptablesRemoveUdpInput(server->iptables, network->bridge, 53);
iptablesRemoveTcpInput(server->iptables, network->bridge, 53);
iptablesRemoveUdpInput(server->iptables, network->bridge, 67);
iptablesRemoveTcpInput(server->iptables, network->bridge, 67);
iptablesRemoveNonBridgedMasq(server->iptables);
iptablesRemoveStateForward(server->iptables, network->bridge);
iptablesRemoveInterfaceForward(server->iptables, network->bridge);
iptablesRemovePhysdevForward(server->iptables, network->bridge);
}
static int
qemudEnableIpForwarding(void)
{
#define PROC_IP_FORWARD "/proc/sys/net/ipv4/ip_forward"
int fd;
if ((fd = open(PROC_IP_FORWARD, O_WRONLY|O_TRUNC)) == -1 ||
write(fd, "1\n", 2) < 0)
return 0;
close (fd);
return 1;
#undef PROC_IP_FORWARD
}
int qemudStartNetworkDaemon(struct qemud_server *server,
struct qemud_network *network) {
const char *name;
@ -899,14 +1022,26 @@ int qemudStartNetworkDaemon(struct qemud_server *server,
goto err_delbr;
}
if (!qemudAddIptablesRules(server, network))
goto err_delbr1;
if (!qemudEnableIpForwarding()) {
qemudReportError(server, VIR_ERR_INTERNAL_ERROR,
"failed to enable IP forwarding : %s\n", strerror(err));
goto err_delbr2;
}
if (network->def.ranges &&
dhcpStartDhcpDaemon(server, network) < 0)
goto err_delbr1;
goto err_delbr2;
network->active = 1;
return 0;
err_delbr2:
qemudRemoveIptablesRules(server, network);
err_delbr1:
if (network->def.ipAddress[0] &&
(err = brSetInterfaceUp(server->brctl, network->bridge, 0))) {
@ -935,6 +1070,8 @@ int qemudShutdownNetworkDaemon(struct qemud_server *server,
if (network->dnsmasqPid > 0)
kill(network->dnsmasqPid, SIGTERM);
qemudRemoveIptablesRules(server, network);
if (network->def.ipAddress[0] &&
(err = brSetInterfaceUp(server->brctl, network->bridge, 0))) {
printf("Damn! Failed to bring down bridge '%s' : %s\n",
@ -1182,6 +1319,8 @@ static void qemudCleanup(struct qemud_server *server) {
}
if (server->brctl)
brShutdown(server->brctl);
if (server->iptables)
iptablesContextFree(server->iptables);
free(server);
}