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Date: Fri, 16 Sep 2016 00:01:26 +0300
From: Cyrill Gorcunov <gorcunov@...il.com>
To: David Ahern <dsa@...ulusnetworks.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
David Miller <davem@...emloft.net>, eric.dumazet@...il.com,
kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
kaber@...sh.net, avagin@...nvz.org, stephen@...workplumber.org
Subject: Re: [PATCH v3] net: ip, diag -- Add diag interface for raw sockets
On Thu, Sep 15, 2016 at 02:54:57PM -0600, David Ahern wrote:
> On 9/15/16 2:22 PM, Cyrill Gorcunov wrote:
> >> ss -K is not working. Socket lookup fails to find a match due to a protocol mismatch.
> >>
> >> haven't had time to track down why there is a mismatch since the kill uses the socket returned
> >> from the dump. Won't have time to come back to this until early next week.
> >
> > Have you ran iproute2 patched? I just ran ss -K and all sockets get closed
> > (including raw ones), which actually kicked me off the testing machine sshd :/
> >
>
>
> This is the patch I applied to iproute2; the change in your goo.gl link plus a debug to confirm the kill action is initiated by ss:
>
> diff --git a/misc/ss.c b/misc/ss.c
> index 3b268d999426..4d98411738ea 100644
> --- a/misc/ss.c
> +++ b/misc/ss.c
> @@ -2334,6 +2334,10 @@ static int show_one_inet_sock(const struct sockaddr_nl *addr,
> if (diag_arg->f->f && run_ssfilter(diag_arg->f->f, &s) == 0)
> return 0;
>
> + if (diag_arg->f->kill) {
> +printf("want to kill:\n");
> + err = inet_show_sock(h, &s, diag_arg->protocol);
> + }
> if (diag_arg->f->kill && kill_inet_sock(h, arg) != 0) {
> if (errno == EOPNOTSUPP || errno == ENOENT) {
> /* Socket can't be closed, or is already closed. */
> @@ -2631,6 +2635,10 @@ static int raw_show(struct filter *f)
>
> dg_proto = RAW_PROTO;
>
> +if (!getenv("PROC_NET_RAW") && !getenv("PROC_ROOT") &&
> +inet_show_netlink(f, NULL, IPPROTO_RAW) == 0)
> +return 0;
> +
> if (f->families&(1<<AF_INET)) {
> if ((fp = net_raw_open()) == NULL)
> goto outerr;
>
Hmm. Weird. I'm running net-next kernel
---
[root@...7 ~]# /root/sock &
[1] 5108
This is a trivial program which opens raw sockets
[root@...7 iproute2]# misc/ss -A raw
State Recv-Q Send-Q Local Address:Port Peer Address:Port
ESTAB 0 0 127.0.0.1:ipproto-255 127.0.0.10:ipproto-9090
UNCONN 0 0 127.0.0.10:ipproto-255 *:*
UNCONN 0 0 :::ipv6-icmp :::*
UNCONN 0 0 :::ipv6-icmp :::*
ESTAB 0 0 ::1:ipproto-255 ::1:ipproto-9091
UNCONN 0 0 ::1:ipproto-255 :::*
[root@...7 iproute2]#
[root@...7 iproute2]# misc/ss -K
Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port
u_str ESTAB 0 0 /var/run/dbus/system_bus_socket 18071 * 16297
u_str ESTAB 0 0 /run/systemd/journal/stdout 18756 * 16188
u_str ESTAB 0 0 /run/systemd/journal/stdout 23014 * 23013
u_str ESTAB 0 0 * 18909 * 16298
u_str ESTAB 0 0 /var/run/dbus/system_bus_socket 19154 * 18163
...
??? ESTAB 0 0 127.0.0.1:ipproto-255 127.0.0.10:ipproto-9090
??? UNCONN 0 0 127.0.0.10:ipproto-255 *:*
??? ESTAB 0 0 ::1:ipproto-255 ::1:ipproto-9091
??? UNCONN 0 0 ::1:ipproto-255 :::*
---
Here I get kicked off the server. Login back
[cyrill@...nus ~] ssh root@...7
Last login: Thu Sep 15 23:20:42 2016 from gateway
[root@...7 ~]# cd /home/iproute2/
[root@...7 iproute2]# misc/ss -A raw
State Recv-Q Send-Q Local Address:Port Peer Address:Port
UNCONN 0 0 :::ipv6-icmp :::*
UNCONN 0 0 :::ipv6-icmp :::*
Maybe I do something wrong for testing?
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