@@ -70,7 +70,7 @@ dnl AC_CHECK_LIB([c], [main])
AC_CHECK_HEADERS(arpa/inet.h)
dnl check for inet_pton
-AC_CHECK_FUNCS(inet_pton)
+AC_CHECK_FUNCS([inet_pton, setns])
dnl Some systems have it, but not IPv6
if test "$ac_cv_func_inet_pton" = "yes" ; then
AC_MSG_CHECKING(if inet_pton supports IPv6)
@@ -6,5 +6,5 @@ noinst_HEADERS = alarm.h jhash.h cache.h linux_list.h linux_rbtree.h \
network.h filter.h queue.h vector.h cidr.h \
traffic_stats.h netlink.h fds.h event.h bitops.h channel.h \
process.h origin.h internal.h external.h date.h nfct.h \
- helper.h myct.h stack.h
+ helper.h myct.h stack.h namespace.h
@@ -94,6 +94,7 @@ struct ct_conf {
int channel_type_global;
struct channel_conf channel[MULTICHANNEL_MAX];
struct local_conf local; /* unix socket facilities */
+ char netlink_namespace[FILENAME_MAXLEN];
int nice;
int limit;
int refresh;
@@ -151,6 +152,11 @@ struct ct_general_state {
struct ct_filter *us_filter;
struct exp_filter *exp_filter;
+ /* namespace file descriptors for conntrackd sockets */
+ struct {
+ int cur_fd; /* conntrack */
+ int root_fd; /* channel*/
+ } ns;
struct nfct_handle *event; /* event handler */
struct nfct_filter *filter; /* event filter */
int event_iterations_limit;
new file mode 100644
@@ -0,0 +1,13 @@
+#ifndef _NAMESPACE_H_
+#define _NAMESPACE_H_
+
+#include <libmnl/libmnl.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
+
+#include "conntrackd.h"
+
+int ns_init(void);
+struct nfct_handle *ns_nfct_open(u_int8_t, unsigned, int);
+struct mnl_socket *ns_mnl_socket_open(int, int);
+
+#endif
@@ -39,7 +39,8 @@ conntrackd_SOURCES = alarm.c main.c run.c hash.c queue.c rbtree.c \
external_cache.c external_inject.c \
internal_cache.c internal_bypass.c \
read_config_yy.y read_config_lex.l \
- stack.c helpers.c utils.c expect.c
+ stack.c helpers.c utils.c expect.c \
+ namespace.c
# yacc and lex generate dirty code
read_config_yy.o read_config_lex.o: AM_CFLAGS += -Wno-missing-prototypes -Wno-missing-declarations -Wno-implicit-function-declaration -Wno-nested-externs -Wno-undef -Wno-redundant-decls
@@ -22,6 +22,7 @@
#include "log.h"
#include "fds.h"
#include "helper.h"
+#include "namespace.h"
#include <unistd.h>
#include <fcntl.h>
@@ -495,7 +496,8 @@ int cthelper_init(void)
return -1;
}
- STATE_CTH(nl) = mnl_socket_open(NETLINK_NETFILTER);
+ STATE_CTH(nl) = ns_mnl_socket_open(NETLINK_NETFILTER,
+ STATE(ns).cur_fd);
if (STATE_CTH(nl) == NULL) {
dlog(LOG_ERR, "cannot open nfq socket");
return -1;
@@ -29,6 +29,7 @@
#include "origin.h"
#include "date.h"
#include "internal.h"
+#include "namespace.h"
#include <errno.h>
#include <signal.h>
@@ -399,6 +400,9 @@ static void poll_cb(void *data)
int ctnl_init(void)
{
+ if (ns_init() == -1)
+ return -1;
+
if (CONFIG(flags) & CTD_STATS_MODE)
STATE(mode) = &stats_mode;
else if (CONFIG(flags) & CTD_SYNC_MODE)
@@ -417,7 +421,8 @@ int ctnl_init(void)
}
/* resynchronize (like 'dump' socket) but it also purges old entries */
- STATE(resync) = nfct_open(CONFIG(netlink).subsys_id, 0);
+ STATE(resync) = ns_nfct_open(CONFIG(netlink).subsys_id, 0,
+ STATE(ns).cur_fd);
if (STATE(resync)== NULL) {
dlog(LOG_ERR, "can't open netlink handler: %s",
strerror(errno));
@@ -438,7 +443,8 @@ int ctnl_init(void)
fcntl(nfct_fd(STATE(resync)), F_SETFL, O_NONBLOCK);
if (STATE(mode)->internal->flags & INTERNAL_F_POPULATE) {
- STATE(dump) = nfct_open(CONFIG(netlink).subsys_id, 0);
+ STATE(dump) = ns_nfct_open(CONFIG(netlink).subsys_id, 0,
+ STATE(ns).cur_fd);
if (STATE(dump) == NULL) {
dlog(LOG_ERR, "can't open netlink handler: %s",
strerror(errno));
@@ -467,7 +473,8 @@ int ctnl_init(void)
}
}
- STATE(get) = nfct_open(CONFIG(netlink).subsys_id, 0);
+ STATE(get) = ns_nfct_open(CONFIG(netlink).subsys_id, 0,
+ STATE(ns).cur_fd);
if (STATE(get) == NULL) {
dlog(LOG_ERR, "can't open netlink handler: %s",
strerror(errno));
@@ -481,7 +488,8 @@ int ctnl_init(void)
exp_get_handler, NULL);
}
- STATE(flush) = nfct_open(CONFIG(netlink).subsys_id, 0);
+ STATE(flush) = ns_nfct_open(CONFIG(netlink).subsys_id, 0,
+ STATE(ns).cur_fd);
if (STATE(flush) == NULL) {
dlog(LOG_ERR, "cannot open flusher handler");
return -1;
@@ -9,6 +9,7 @@
*/
#include "helper.h"
+#include "namespace.h"
#include <stdio.h>
#include <string.h>
@@ -165,7 +166,7 @@ static int cthelper_expect_cmd(struct nf_expect *exp, int cmd)
int ret;
struct nfct_handle *h;
- h = nfct_open(EXPECT, 0);
+ h = ns_nfct_open(EXPECT, 0, STATE(ns).cur_fd);
if (!h)
return -1;
@@ -22,6 +22,7 @@
#include "cache.h"
#include "origin.h"
#include "external.h"
+#include "namespace.h"
#include "netlink.h"
#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
@@ -42,7 +43,7 @@ struct {
static int external_inject_init(void)
{
/* handler to directly inject conntracks into kernel-space */
- inject = nfct_open(CONFIG(netlink).subsys_id, 0);
+ inject = ns_nfct_open(CONFIG(netlink).subsys_id, 0, STATE(ns).cur_fd);
if (inject == NULL) {
dlog(LOG_ERR, "can't open netlink handler: %s",
strerror(errno));
@@ -16,6 +16,7 @@
#include "netlink.h"
#include "network.h"
#include "origin.h"
+#include "namespace.h"
static int internal_bypass_init(void)
{
@@ -52,7 +53,7 @@ static void internal_bypass_ct_dump(int fd, int type)
u_int32_t family = AF_UNSPEC;
int ret;
- h = nfct_open(CONFIG(netlink).subsys_id, 0);
+ h = ns_nfct_open(CONFIG(netlink).subsys_id, 0, STATE(ns).cur_fd);
if (h == NULL) {
dlog(LOG_ERR, "can't allocate memory for the internal cache");
return;
@@ -183,7 +184,7 @@ static void internal_bypass_exp_dump(int fd, int type)
u_int32_t family = AF_UNSPEC;
int ret;
- h = nfct_open(CONFIG(netlink).subsys_id, 0);
+ h = ns_nfct_open(CONFIG(netlink).subsys_id, 0, STATE(ns).cur_fd);
if (h == NULL) {
dlog(LOG_ERR, "can't allocate memory for the internal cache");
return;
new file mode 100644
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2012 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Authors:
+ * Ansis Atteka <aatteka@nicira.com>
+ */
+#define _GNU_SOURCE
+
+#include "namespace.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <sched.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "log.h"
+
+#ifndef HAVE_SETNS
+static int setns(int fd, int nstype) {
+#ifdef __NR_setns
+#define HAVE_SETNS
+ return syscall(__NR_setns, fd, nstype);
+#else
+ return 0;
+#endif
+}
+#endif /* HAVE_SETNS */
+
+static int
+ctd_change_namespace(int fd)
+{
+ if (fd == -1)
+ return 0;
+#ifdef HAVE_SETNS
+ if (setns(fd, CLONE_NEWNET)) {
+ dlog(LOG_ERR, "could not switch to namespace: %s",
+ strerror(errno));
+ return -1;
+ }
+#endif
+ return 0;
+}
+
+static int do_ns_init(void)
+{
+ STATE(ns).cur_fd = open(CONFIG(netlink_namespace), O_RDONLY);
+ if (STATE(ns).cur_fd == -1) {
+ dlog(LOG_ERR, "couldn't open namespace %s: %s",
+ CONFIG(netlink_namespace),
+ strerror(errno));
+ return -1;
+ }
+ STATE(ns).root_fd = open("/proc/self/ns/net", O_RDONLY);
+ if (STATE(ns).root_fd == -1) {
+ dlog(LOG_WARNING, "couldn't open root namespace: %s",
+ strerror(errno));
+ return -1;
+ }
+ return 0;
+}
+
+int ns_init(void)
+{
+ int ret = 0;
+
+ STATE(ns).root_fd = -1;
+ STATE(ns).cur_fd = -1;
+
+ if (!CONFIG(netlink_namespace)[0])
+ return 0;
+#ifndef HAVE_SETNS
+ dlog(LOG_ERR, "conntrackd was not built with namespace support");
+ ret = -1;
+#else
+ ret = do_ns_init();
+#endif
+ return ret;
+}
+
+struct nfct_handle *ns_nfct_open(u_int8_t subsys_id, unsigned subscriptions,
+ int ns_fd)
+{
+ struct nfct_handle *handle;
+
+ if (ctd_change_namespace(ns_fd) < 0)
+ return NULL;
+
+ handle = nfct_open(subsys_id, subscriptions);
+ if (ctd_change_namespace(STATE(ns).root_fd) < 0) {
+ if (handle)
+ nfct_close(handle);
+ return NULL;
+ }
+ return handle;
+}
+
+struct mnl_socket *ns_mnl_socket_open(int bus, int ns_fd)
+{
+ struct mnl_socket *handle;
+
+ if (ctd_change_namespace(ns_fd) < 0)
+ return NULL;
+ handle = mnl_socket_open(bus);
+ if (ctd_change_namespace(STATE(ns).root_fd) < 0) {
+ if (handle)
+ mnl_socket_close(handle);
+ return NULL;
+ }
+ return handle;
+}
@@ -21,6 +21,7 @@
#include "conntrackd.h"
#include "filter.h"
#include "log.h"
+#include "namespace.h"
#include <string.h>
#include <errno.h>
@@ -33,7 +34,8 @@ struct nfct_handle *nl_init_event_handler(void)
{
struct nfct_handle *h;
- h = nfct_open(CONFIG(netlink).subsys_id, CONFIG(netlink).groups);
+ h = ns_nfct_open(CONFIG(netlink).subsys_id, CONFIG(netlink).groups,
+ STATE(ns).cur_fd);
if (h == NULL)
return NULL;
@@ -175,7 +177,7 @@ int nl_flush_conntrack_table_selective(void)
struct nfct_handle *h;
int ret;
- h = nfct_open(CONNTRACK, 0);
+ h = ns_nfct_open(CONNTRACK, 0, STATE(ns).cur_fd);
if (h == NULL) {
dlog(LOG_ERR, "cannot open handle");
return -1;
@@ -91,6 +91,7 @@ notrack [N|n][O|o][T|t][R|r][A|a][C|c][K|k]
"SocketBufferSizeMaxGrowth" { return T_BUFFER_SIZE_MAX_GROWN; /* alias */ }
"NetlinkBufferSize" { return T_BUFFER_SIZE; }
"NetlinkBufferSizeMaxGrowth" { return T_BUFFER_SIZE_MAX_GROWN; }
+"NetlinkNamespace" { return T_NETLINK_NAMESPACE; }
"Mode" { return T_SYNC_MODE; }
"ListenTo" { return T_LISTEN_TO; }
"Family" { return T_FAMILY; }
@@ -88,7 +88,7 @@ enum {
%token T_DISABLE_INTERNAL_CACHE T_DISABLE_EXTERNAL_CACHE T_ERROR_QUEUE_LENGTH
%token T_OPTIONS T_TCP_WINDOW_TRACKING T_EXPECT_SYNC
%token T_HELPER T_HELPER_QUEUE_NUM T_HELPER_QUEUE_LEN T_HELPER_POLICY
-%token T_HELPER_EXPECT_TIMEOUT T_HELPER_EXPECT_MAX
+%token T_HELPER_EXPECT_TIMEOUT T_HELPER_EXPECT_MAX T_NETLINK_NAMESPACE
%token <string> T_IP T_PATH_VAL
%token <val> T_NUMBER
@@ -1114,6 +1114,7 @@ general_line: hashsize
| unix_line
| netlink_buffer_size
| netlink_buffer_size_max_grown
+ | netlink_namespace
| family
| event_iterations_limit
| poll_secs
@@ -1159,6 +1160,11 @@ netlink_events_reliable : T_NETLINK_EVENTS_RELIABLE T_OFF
conf.netlink.events_reliable = 0;
};
+netlink_namespace : T_NETLINK_NAMESPACE T_PATH_VAL
+{
+ strncpy(conf.netlink_namespace, $2, FILENAME_MAXLEN);
+};
+
nice : T_NICE T_SIGNED_NUMBER
{
conf.nice = $2;
@@ -30,6 +30,7 @@
#include "origin.h"
#include "date.h"
#include "internal.h"
+#include "namespace.h"
#include <errno.h>
#include <signal.h>
@@ -31,6 +31,7 @@
#include "origin.h"
#include "internal.h"
#include "external.h"
+#include "namespace.h"
#include <errno.h>
#include <unistd.h>
@@ -451,7 +452,8 @@ static int init_sync(void)
tx_queue_cb, NULL, STATE(fds)) == -1)
return -1;
- STATE_SYNC(commit).h = nfct_open(CONFIG(netlink).subsys_id, 0);
+ STATE_SYNC(commit).h = ns_nfct_open(CONFIG(netlink).subsys_id, 0,
+ STATE(ns).cur_fd);
if (STATE_SYNC(commit).h == NULL) {
dlog(LOG_ERR, "can't create handler to commit");
return -1;
@@ -24,6 +24,7 @@
#include "log.h"
#include "cache.h"
#include "fds.h"
+#include "namespace.h"
#include <string.h>
@@ -102,7 +103,7 @@ static void kernel_resync(void)
u_int32_t family = AF_UNSPEC;
int ret;
- h = nfct_open(CONFIG(netlink).subsys_id, 0);
+ h = ns_nfct_open(CONFIG(netlink).subsys_id, 0, STATE(ns).cur_fd);
if (h == NULL) {
dlog(LOG_ERR, "can't allocate memory for the internal cache");
return;
This patch allows conntrackd to open CT Netlink sockets into a given network namespace. Channel sockets (e.g. UDP) would still be opened into the same namespace where conntrackd was started. The only binary this patch affects is conntrackd. All other binaries (e.g. conntrack, nfct) would still operate in the same namespace where they were started. To make use of this patch: 1. create a network namespace: "ip netns add the_ns" 2. add "NetlinkNamespace /var/run/netns/the_ns" line to the conntrackd.conf file inside General {...} section. Signed-off-by: Ansis Atteka <aatteka@nicira.com> --- configure.ac | 2 +- include/Makefile.am | 2 +- include/conntrackd.h | 6 +++ include/namespace.h | 13 +++++ src/Makefile.am | 3 +- src/cthelper.c | 4 +- src/ctnl.c | 16 +++++-- src/expect.c | 3 +- src/external_inject.c | 3 +- src/internal_bypass.c | 5 +- src/namespace.c | 127 +++++++++++++++++++++++++++++++++++++++++++++++++ src/netlink.c | 6 ++- src/read_config_lex.l | 1 + src/read_config_yy.y | 8 +++- src/run.c | 1 + src/sync-mode.c | 4 +- src/sync-notrack.c | 3 +- 17 files changed, 190 insertions(+), 17 deletions(-) create mode 100644 include/namespace.h create mode 100644 src/namespace.c