netdev - [PATCH iproute2 1/2] ip: display netns name instead of nsid

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Date:   Mon,  4 Jun 2018 14:12:52 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     stephen@...workplumber.org
Cc:     netdev@...r.kernel.org, Nicolas Dichtel <nicolas.dichtel@...nd.com>
Subject: [PATCH iproute2 1/2] ip: display netns name instead of nsid

When iproute2 has a name for the nsid, let's display it. It's more
user friendly than a number.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
---
 ip/ip_common.h |  1 +
 ip/ipaddress.c | 23 ++++++++++++++++++-----
 ip/ipnetns.c   | 10 ++++++++++
 3 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/ip/ip_common.h b/ip/ip_common.h
index 49eb7d7bed40..794478c546cd 100644
--- a/ip/ip_common.h
+++ b/ip/ip_common.h
@@ -60,6 +60,7 @@ void netns_map_init(void);
 void netns_nsid_socket_init(void);
 int print_nsid(const struct sockaddr_nl *who,
 	       struct nlmsghdr *n, void *arg);
+char *get_name_from_nsid(int nsid);
 int do_ipaddr(int argc, char **argv);
 int do_ipaddrlabel(int argc, char **argv);
 int do_iproute(int argc, char **argv);
diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index c7c7e7df4e81..aee09c7ff6df 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -819,6 +819,9 @@ int print_linkinfo(const struct sockaddr_nl *who,
 	unsigned int m_flag = 0;
 	SPRINT_BUF(b1);
 
+	netns_nsid_socket_init();
+	netns_map_init();
+
 	if (n->nlmsg_type != RTM_NEWLINK && n->nlmsg_type != RTM_DELLINK)
 		return 0;
 
@@ -955,10 +958,16 @@ int print_linkinfo(const struct sockaddr_nl *who,
 		if (is_json_context()) {
 			print_int(PRINT_JSON, "link_netnsid", NULL, id);
 		} else {
-			if (id >= 0)
-				print_int(PRINT_FP, NULL,
-					  " link-netnsid %d", id);
-			else
+			if (id >= 0) {
+				char *name = get_name_from_nsid(id);
+
+				if (name)
+					print_string(PRINT_FP, NULL,
+						     " link-netns %s", name);
+				else
+					print_int(PRINT_FP, NULL,
+						  " link-netnsid %d", id);
+			} else
 				print_string(PRINT_FP, NULL,
 					     " link-netnsid %s", "unknown");
 		}
@@ -966,8 +975,12 @@ int print_linkinfo(const struct sockaddr_nl *who,
 
 	if (tb[IFLA_NEW_NETNSID]) {
 		int id = rta_getattr_u32(tb[IFLA_NEW_NETNSID]);
+		char *name = get_name_from_nsid(id);
 
-		print_int(PRINT_FP, NULL, " new-nsid %d", id);
+		if (name)
+			print_string(PRINT_FP, NULL, " new-netns %s", name);
+		else
+			print_int(PRINT_FP, NULL, " new-netnsid %d", id);
 	}
 	if (tb[IFLA_NEW_IFINDEX]) {
 		int id = rta_getattr_u32(tb[IFLA_NEW_IFINDEX]);
diff --git a/ip/ipnetns.c b/ip/ipnetns.c
index e06100f4ad2d..a4f5b02427e7 100644
--- a/ip/ipnetns.c
+++ b/ip/ipnetns.c
@@ -169,6 +169,16 @@ static struct nsid_cache *netns_map_get_by_nsid(int nsid)
 	return NULL;
 }
 
+char *get_name_from_nsid(int nsid)
+{
+	struct nsid_cache *c = netns_map_get_by_nsid(nsid);
+
+	if (c)
+		return c->name;
+
+	return NULL;
+}
+
 static int netns_map_add(int nsid, const char *name)
 {
 	struct nsid_cache *c;
-- 
2.15.1