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Message-Id: <20190610221613.7554-3-mcroce@redhat.com>
Date: Tue, 11 Jun 2019 00:16:13 +0200
From: Matteo Croce <mcroce@...hat.com>
To: netdev@...r.kernel.org
Cc: David Ahern <dsahern@...nel.org>,
Stephen Hemminger <stephen@...workplumber.org>
Subject: [PATCH iproute2 2/2] netns: make netns_{save,restore} static
The netns_{save,restore} functions are only used in ipnetns.c now, since
the restore is not needed anymore after the netns exec command.
Move them in ipnetns.c, and make them static.
Signed-off-by: Matteo Croce <mcroce@...hat.com>
---
include/namespace.h | 2 --
ip/ip.c | 1 -
ip/ipnetns.c | 31 +++++++++++++++++++++++++++++++
lib/namespace.c | 31 -------------------------------
4 files changed, 31 insertions(+), 34 deletions(-)
diff --git a/include/namespace.h b/include/namespace.h
index 89cdda11..e47f9b5d 100644
--- a/include/namespace.h
+++ b/include/namespace.h
@@ -49,8 +49,6 @@ static inline int setns(int fd, int nstype)
}
#endif /* HAVE_SETNS */
-void netns_save(void);
-void netns_restore(void);
int netns_switch(char *netns);
int netns_get_fd(const char *netns);
int netns_foreach(int (*func)(char *nsname, void *arg), void *arg);
diff --git a/ip/ip.c b/ip/ip.c
index 49b3aa49..b71ae816 100644
--- a/ip/ip.c
+++ b/ip/ip.c
@@ -158,7 +158,6 @@ static int batch(const char *name)
if (!force)
break;
}
- netns_restore();
}
if (line)
free(line);
diff --git a/ip/ipnetns.c b/ip/ipnetns.c
index 9e414b55..beb7fb8f 100644
--- a/ip/ipnetns.c
+++ b/ip/ipnetns.c
@@ -45,6 +45,7 @@ static int usage(void)
static struct rtnl_handle rtnsh = { .fd = -1 };
static int have_rtnl_getnsid = -1;
+static int saved_netns = -1;
static int ipnetns_accept_msg(struct rtnl_ctrl_data *ctrl,
struct nlmsghdr *n, void *arg)
@@ -623,6 +624,33 @@ static int create_netns_dir(void)
return 0;
}
+/* Obtain a FD for the current namespace, so we can reenter it later */
+static void netns_save(void)
+{
+ if (saved_netns != -1)
+ return;
+
+ saved_netns = open("/proc/self/ns/net", O_RDONLY | O_CLOEXEC);
+ if (saved_netns == -1) {
+ perror("Cannot open init namespace");
+ exit(1);
+ }
+}
+
+static void netns_restore(void)
+{
+ if (saved_netns == -1)
+ return;
+
+ if (setns(saved_netns, CLONE_NEWNET)) {
+ perror("setns");
+ exit(1);
+ }
+
+ close(saved_netns);
+ saved_netns = -1;
+}
+
static int netns_add(int argc, char **argv, bool create)
{
/* This function creates a new network namespace and
@@ -716,9 +744,12 @@ static int netns_add(int argc, char **argv, bool create)
proc_path, netns_path, strerror(errno));
goto out_delete;
}
+ netns_restore();
+
return 0;
out_delete:
if (create) {
+ netns_restore();
netns_delete(argc, argv);
} else if (unlink(netns_path) < 0) {
fprintf(stderr, "Cannot remove namespace file \"%s\": %s\n",
diff --git a/lib/namespace.c b/lib/namespace.c
index a2aea57a..06ae0a48 100644
--- a/lib/namespace.c
+++ b/lib/namespace.c
@@ -15,35 +15,6 @@
#include "utils.h"
#include "namespace.h"
-static int saved_netns = -1;
-
-/* Obtain a FD for the current namespace, so we can reenter it later */
-void netns_save(void)
-{
- if (saved_netns != -1)
- return;
-
- saved_netns = open("/proc/self/ns/net", O_RDONLY | O_CLOEXEC);
- if (saved_netns == -1) {
- perror("Cannot open init namespace");
- exit(1);
- }
-}
-
-void netns_restore(void)
-{
- if (saved_netns == -1)
- return;
-
- if (setns(saved_netns, CLONE_NEWNET)) {
- perror("setns");
- exit(1);
- }
-
- close(saved_netns);
- saved_netns = -1;
-}
-
static void bind_etc(const char *name)
{
char etc_netns_path[sizeof(NETNS_ETC_DIR) + NAME_MAX];
@@ -90,8 +61,6 @@ int netns_switch(char *name)
return -1;
}
- netns_save();
-
if (setns(netns, CLONE_NEWNET) < 0) {
fprintf(stderr, "setting the network namespace \"%s\" failed: %s\n",
name, strerror(errno));
--
2.21.0
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