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Date: Wed, 28 Jan 2015 15:15:48 +0100
From: Nicolas Dichtel <nicolas.dichtel@...nd.com>
To: shemminger@...tta.com
Cc: netdev@...r.kernel.org, Nicolas Dichtel <nicolas.dichtel@...nd.com>
Subject: [PATCH v2 iproute2-next 2/4] ipnetns: allow to get and set netns ids
The kernel now provides ids for peer netns. This patch implements a new command
'set' to assign an id.
When netns are listed, if an id is assigned, it is now displayed.
Example:
$ ip netns add foo
$ ip netns set foo 1
$ ip netns
foo (id: 1)
init_net
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
---
v2: no change
include/libnetlink.h | 8 ++++
ip/ipnetns.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++++++-
man/man8/ip-netns.8 | 14 +++++++
3 files changed, 134 insertions(+), 1 deletion(-)
diff --git a/include/libnetlink.h b/include/libnetlink.h
index d081e54210ea..898275b824d4 100644
--- a/include/libnetlink.h
+++ b/include/libnetlink.h
@@ -158,6 +158,14 @@ extern int rtnl_from_file(FILE *, rtnl_filter_t handler,
#define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ndtmsg))
#endif
+#ifndef NETNS_RTA
+#define NETNS_RTA(r) \
+ ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))))
+#endif
+#ifndef NETNS_PAYLOAD
+#define NETNS_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct rtgenmsg))
+#endif
+
/* User defined nlmsg_type which is used mostly for logging netlink
* messages from dump file */
#define NLMSG_TSTAMP 15
diff --git a/ip/ipnetns.c b/ip/ipnetns.c
index 123318eb6adf..8c86673db581 100644
--- a/ip/ipnetns.c
+++ b/ip/ipnetns.c
@@ -15,6 +15,8 @@
#include <unistd.h>
#include <ctype.h>
+#include <linux/net_namespace.h>
+
#include "utils.h"
#include "ip_common.h"
#include "namespace.h"
@@ -23,6 +25,7 @@ static int usage(void)
{
fprintf(stderr, "Usage: ip netns list\n");
fprintf(stderr, " ip netns add NAME\n");
+ fprintf(stderr, " ip netns set NAME NETNSID\n");
fprintf(stderr, " ip netns delete NAME\n");
fprintf(stderr, " ip netns identify [PID]\n");
fprintf(stderr, " ip netns pids NAME\n");
@@ -31,10 +34,56 @@ static int usage(void)
exit(-1);
}
+static int get_netnsid_from_name(const char *name)
+{
+ struct {
+ struct nlmsghdr n;
+ struct rtgenmsg g;
+ char buf[1024];
+ } req, answer;
+ struct rtattr *tb[NETNSA_MAX + 1];
+ struct rtgenmsg *rthdr;
+ int len, fd;
+
+ memset(&req, 0, sizeof(req));
+ req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
+ req.n.nlmsg_flags = NLM_F_REQUEST;
+ req.n.nlmsg_type = RTM_GETNSID;
+ req.g.rtgen_family = AF_UNSPEC;
+
+ fd = netns_get_fd(name);
+ if (fd < 0)
+ return fd;
+
+ addattr32(&req.n, 1024, NETNSA_FD, fd);
+ if (rtnl_talk(&rth, &req.n, 0, 0, &answer.n) < 0) {
+ close(fd);
+ return -2;
+ }
+ close(fd);
+
+ /* Validate message and parse attributes */
+ if (answer.n.nlmsg_type == NLMSG_ERROR)
+ return -1;
+
+ rthdr = NLMSG_DATA(&answer.n);
+ len = answer.n.nlmsg_len - NLMSG_SPACE(sizeof(*rthdr));
+ if (len < 0)
+ return -1;
+
+ parse_rtattr(tb, NETNSA_MAX, NETNS_RTA(rthdr), len);
+
+ if (tb[NETNSA_NSID])
+ return rta_getattr_u32(tb[NETNSA_NSID]);
+
+ return -1;
+}
+
static int netns_list(int argc, char **argv)
{
struct dirent *entry;
DIR *dir;
+ int id;
dir = opendir(NETNS_RUN_DIR);
if (!dir)
@@ -45,7 +94,11 @@ static int netns_list(int argc, char **argv)
continue;
if (strcmp(entry->d_name, "..") == 0)
continue;
- printf("%s\n", entry->d_name);
+ printf("%s", entry->d_name);
+ id = get_netnsid_from_name(entry->d_name);
+ if (id >= 0)
+ printf(" (id: %d)", id);
+ printf("\n");
}
closedir(dir);
return 0;
@@ -355,6 +408,61 @@ out_delete:
return -1;
}
+static int set_netnsid_from_name(const char *name, int nsid)
+{
+ struct {
+ struct nlmsghdr n;
+ struct rtgenmsg g;
+ char buf[1024];
+ } req;
+ int fd, err = 0;
+
+ memset(&req, 0, sizeof(req));
+ req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
+ req.n.nlmsg_flags = NLM_F_REQUEST;
+ req.n.nlmsg_type = RTM_NEWNSID;
+ req.g.rtgen_family = AF_UNSPEC;
+
+ fd = netns_get_fd(name);
+ if (fd < 0)
+ return fd;
+
+ addattr32(&req.n, 1024, NETNSA_FD, fd);
+ addattr32(&req.n, 1024, NETNSA_NSID, nsid);
+ if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
+ err = -2;
+
+ close(fd);
+ return err;
+}
+
+static int netns_set(int argc, char **argv)
+{
+ char netns_path[MAXPATHLEN];
+ const char *name;
+ int netns, nsid;
+
+ if (argc < 1) {
+ fprintf(stderr, "No netns name specified\n");
+ return -1;
+ }
+ if (argc < 2) {
+ fprintf(stderr, "No nsid specified\n");
+ return -1;
+ }
+ name = argv[0];
+ nsid = atoi(argv[1]);
+
+ snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, name);
+ netns = open(netns_path, O_RDONLY | O_CLOEXEC);
+ if (netns < 0) {
+ fprintf(stderr, "Cannot open network namespace \"%s\": %s\n",
+ name, strerror(errno));
+ return -1;
+ }
+
+ return set_netnsid_from_name(name, nsid);
+}
static int netns_monitor(int argc, char **argv)
{
@@ -410,6 +518,9 @@ int do_netns(int argc, char **argv)
if (matches(*argv, "add") == 0)
return netns_add(argc-1, argv+1);
+ if (matches(*argv, "set") == 0)
+ return netns_set(argc-1, argv+1);
+
if (matches(*argv, "delete") == 0)
return netns_delete(argc-1, argv+1);
diff --git a/man/man8/ip-netns.8 b/man/man8/ip-netns.8
index 74343ed6b640..95fc5e6b8a45 100644
--- a/man/man8/ip-netns.8
+++ b/man/man8/ip-netns.8
@@ -20,6 +20,10 @@ ip-netns \- process network namespace management
.I NETNSNAME
.ti -8
+.BR "ip netns" " { " set " } "
+.I NETNSNAME NETNSID
+
+.ti -8
.BR "ip netns identify"
.RI "[ " PID " ]"
@@ -85,6 +89,16 @@ persists until it has no more users. ip netns delete may fail if
the mount point is in use in another mount namespace.
.TP
+.B ip netns set NAME NETNSID - assign an id to a peer network namespace
+.sp
+This command assigns a id to a peer network namespace. This id is valid
+only in the current network namespace.
+This id will be used by the kernel in some netlink messages. If no id is
+assigned when the kernel needs it, it will be automatically assigned by
+the kernel.
+Once it is assigned, it's not possible to change it.
+
+.TP
.B ip netns identify [PID] - Report network namespaces names for process
.sp
This command walks through /var/run/netns and finds all the network
--
2.2.2
--
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