linux-kernel - Re: [PATCH 19/26] net/ipv6: switch ipv6_flowlabel_opt to sockptr

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Date:   Mon, 27 Jul 2020 16:33:31 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     Christoph Hellwig <hch@....de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Eric Dumazet <edumazet@...gle.com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        linux-sctp@...r.kernel.org, linux-hams@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, bridge@...ts.linux-foundation.org,
        linux-can@...r.kernel.org, dccp@...r.kernel.org,
        linux-decnet-user@...ts.sourceforge.net,
        linux-wpan@...r.kernel.org, linux-s390@...r.kernel.org,
        mptcp@...ts.01.org, lvs-devel@...r.kernel.org,
        rds-devel@....oracle.com, linux-afs@...ts.infradead.org,
        tipc-discussion@...ts.sourceforge.net, linux-x25@...r.kernel.org
Subject: Re: [PATCH 19/26] net/ipv6: switch ipv6_flowlabel_opt to sockptr_t

On Mon, Jul 27, 2020 at 03:00:29PM +0200, Christoph Hellwig wrote:
> On Mon, Jul 27, 2020 at 03:15:05PM +0300, Ido Schimmel wrote:
> > I see a regression with IPv6 flowlabel that I bisected to this patch.
> > When passing '-F 0' to 'ping' the flow label should be random, yet it's
> > the same every time after this patch.
> 
> Can you send a reproducer?

```
#!/bin/bash

ip link add name dummy10 up type dummy

ping -q -F 0 -I dummy10 ff02::1 &> /dev/null &
tcpdump -nne -e -i dummy10 -vvv -c 1 dst host ff02::1
pkill ping

echo

ping -F 0 -I dummy10 ff02::1 &> /dev/null &
tcpdump -nne -e -i dummy10 -vvv -c 1 dst host ff02::1
pkill ping

ip link del dev dummy10
```

Output with commit ff6a4cf214ef ("net/ipv6: split up
ipv6_flowlabel_opt"):

```
dropped privs to tcpdump
tcpdump: listening on dummy10, link-type EN10MB (Ethernet), capture size 262144 bytes
16:26:27.072559 62:80:34:1d:b4:b8 > 33:33:00:00:00:01, ethertype IPv6 (0x86dd), length 118: (flowlabel 0x920cf, hlim 1, next-header ICMPv6 (58) payload length: 64) fe80::6080:34ff:fe1d:b4b8 > ff02::1: [icmp6 sum ok] ICMP6, echo request, seq 2
1 packet captured
1 packet received by filter
0 packets dropped by kernel

dropped privs to tcpdump
tcpdump: listening on dummy10, link-type EN10MB (Ethernet), capture size 262144 bytes
16:26:28.352528 62:80:34:1d:b4:b8 > 33:33:00:00:00:01, ethertype IPv6 (0x86dd), length 118: (flowlabel 0xcdd97, hlim 1, next-header ICMPv6 (58) payload length: 64) fe80::6080:34ff:fe1d:b4b8 > ff02::1: [icmp6 sum ok] ICMP6, echo request, seq 2
1 packet captured
1 packet received by filter
0 packets dropped by kernel
```

Output with commit 86298285c9ae ("net/ipv6: switch ipv6_flowlabel_opt to
sockptr_t"):

```
dropped privs to tcpdump
tcpdump: listening on dummy10, link-type EN10MB (Ethernet), capture size 262144 bytes
16:32:17.848517 f2:9a:05:ff:cb:25 > 33:33:00:00:00:01, ethertype IPv6 (0x86dd), length 118: (flowlabel 0xfab36, hlim 1, next-header ICMPv6 (58) payload length: 64) fe80::f09a:5ff:feff:cb25 > ff02::1: [icmp6 sum ok] ICMP6, echo request, seq 2
1 packet captured
1 packet received by filter
0 packets dropped by kernel

dropped privs to tcpdump
tcpdump: listening on dummy10, link-type EN10MB (Ethernet), capture size 262144 bytes
16:32:19.000779 f2:9a:05:ff:cb:25 > 33:33:00:00:00:01, ethertype IPv6 (0x86dd), length 118: (flowlabel 0xfab36, hlim 1, next-header ICMPv6 (58) payload length: 64) fe80::f09
a:5ff:feff:cb25 > ff02::1: [icmp6 sum ok] ICMP6, echo request, seq 2
1 packet captured
1 packet received by filter
0 packets dropped by kernel
```

> 
> > 
> > It seems that the pointer is never advanced after the call to
> > sockptr_advance() because it is passed by value and not by reference.
> > Even if you were to pass it by reference I think you would later need to
> > call sockptr_decrease() or something similar. Otherwise it is very
> > error-prone.
> > 
> > Maybe adding an offset to copy_to_sockptr() and copy_from_sockptr() is
> > better?
> 
> We could do that, although I wouldn't add it to the existing functions
> to avoid the churns and instead add copy_to_sockptr_offset or something
> like that.

Sounds good

Thanks