ip link: add support to display extended tun attributes

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David Ahern <dsahern@gmail.com>

diff --git a/ip/iptuntap.c b/ip/iptuntap.c
index 4628db2832b4a0ca767819ec60297e2bb5d74ee6..07253870472f3703e56fb599985f2d547c6bc4d8 100644 (file)
--- a/ip/iptuntap.c
+++ b/ip/iptuntap.c
@@ -469,3 +469,89 @@ int do_iptuntap(int argc, char **argv)
                *argv);
        exit(-1);
 }
+
+static void print_owner(FILE *f, uid_t uid)
+{
+       struct passwd *pw = getpwuid(uid);
+
+       if (pw)
+               fprintf(f, "user %s ", pw->pw_name);
+       else
+               fprintf(f, "user %u ", uid);
+}
+
+static void print_group(FILE *f, gid_t gid)
+{
+       struct group *group = getgrgid(gid);
+
+       if (group)
+               fprintf(f, "group %s ", group->gr_name);
+       else
+               fprintf(f, "group %u ", gid);
+}
+
+static void print_mq(FILE *f, struct rtattr *tb[])
+{
+       if (!tb[IFLA_TUN_MULTI_QUEUE] ||
+           !rta_getattr_u8(tb[IFLA_TUN_MULTI_QUEUE]))
+               return;
+
+       fprintf(f, "multi_queue ");
+
+       if (tb[IFLA_TUN_NUM_QUEUES]) {
+               fprintf(f, "numqueues %u ",
+                       rta_getattr_u32(tb[IFLA_TUN_NUM_QUEUES]));
+       }
+
+       if (tb[IFLA_TUN_NUM_DISABLED_QUEUES]) {
+               fprintf(f, "numdisabled %u ",
+                       rta_getattr_u32(tb[IFLA_TUN_NUM_DISABLED_QUEUES]));
+       }
+}
+
+static void print_onoff(FILE *f, const char *flag, __u8 val)
+{
+       fprintf(f, "%s %s ", flag, val ? "on" : "off");
+}
+
+static void tun_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
+{
+       if (!tb)
+               return;
+
+       if (tb[IFLA_TUN_TYPE]) {
+               __u8 type = rta_getattr_u8(tb[IFLA_TUN_TYPE]);
+
+               if (type == IFF_TUN)
+                       fprintf(f, "type tun ");
+               else if (type == IFF_TAP)
+                       fprintf(f, "type tap ");
+               else
+                       fprintf(f, "type UNKNOWN:%hhu ", type);
+       }
+
+       if (tb[IFLA_TUN_PI])
+               print_onoff(f, "pi", rta_getattr_u8(tb[IFLA_TUN_PI]));
+
+       if (tb[IFLA_TUN_VNET_HDR]) {
+               print_onoff(f, "vnet_hdr",
+                           rta_getattr_u8(tb[IFLA_TUN_VNET_HDR]));
+       }
+
+       print_mq(f, tb);
+
+       if (tb[IFLA_TUN_PERSIST])
+               print_onoff(f, "persist", rta_getattr_u8(tb[IFLA_TUN_PERSIST]));
+
+       if (tb[IFLA_TUN_OWNER])
+               print_owner(f, rta_getattr_u32(tb[IFLA_TUN_OWNER]));
+
+       if (tb[IFLA_TUN_GROUP])
+               print_group(f, rta_getattr_u32(tb[IFLA_TUN_GROUP]));
+}
+
+struct link_util tun_link_util = {
+       .id = "tun",
+       .maxattr = IFLA_TUN_MAX,
+       .print_opt = tun_print_opt,
+};