From 14809558dba9fe8c9ff2943fbea8cb05f6a1bfbf Mon Sep 17 00:00:00 2001 From: Phil Sutter Date: Wed, 24 Jun 2015 13:07:20 +0200 Subject: [PATCH 2/2] ss: print value of IPV6_V6ONLY socket option if set If available and set, print 'v6only:1' for AF_INET6 sockets upon request of extended information. For IPv6 sockets bound to in6addr_any, this is the only way to determine if they will also accept IPv4 requests or not. Signed-off-by: Phil Sutter --- misc/ss.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/misc/ss.c b/misc/ss.c index 954a30b..ec08e03 100644 --- a/misc/ss.c +++ b/misc/ss.c @@ -2026,6 +2026,11 @@ static int inet_show_sock(struct nlmsghdr *nlh, struct filter *f, int protocol) if (show_details) { sock_details_print(&s); + if (s.local.family == AF_INET6 && tb[INET_DIAG_SKV6ONLY]) { + unsigned char v6only; + v6only = *(__u8 *)RTA_DATA(tb[INET_DIAG_SKV6ONLY]); + printf(" v6only:%u", v6only); + } if (tb[INET_DIAG_SHUTDOWN]) { unsigned char mask; mask = *(__u8 *)RTA_DATA(tb[INET_DIAG_SHUTDOWN]); -- 1.8.3.1