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ip link: add support to display extended tun attributes

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Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
Sabrina Dubroca 2018-02-20 13:43:22 +01:00 committed by David Ahern
parent 07ed8df604
commit 118eda77d6
1 changed files with 86 additions and 0 deletions
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86
ip/iptuntap.c
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@ -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,
};