netdev - Re: [PATCH V2 net-next 5/5] icmp: add response to RFC 8335 PROBE messages

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Date:   Thu, 4 Feb 2021 12:16:02 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Andreas Roeseler <andreas.a.roeseler@...il.com>
Cc:     davem@...emloft.net, kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH V2 net-next 5/5] icmp: add response to RFC 8335 PROBE
 messages

On Wed,  3 Feb 2021 15:24:55 -0800 Andreas Roeseler wrote:
> Modify the icmp_rcv function to check for PROBE messages and call
> icmp_echo if a PROBE request is detected.
> 
> Modify the existing icmp_echo function to respond to both ping and PROBE
> requests.
> 
> This was tested using a custom modification of the iputils package and
> wireshark. It supports IPV4 probing by name, ifindex, and probing by both IPV4 and IPV6
> addresses. It currently does not support responding to probes off the proxy node
> (See RFC 8335 Section 2). 
> 
> 
> Signed-off-by: Andreas Roeseler <andreas.a.roeseler@...il.com>

make allmodconfig && make W=1 C=1 says:

../net/ipv4/icmp.c: note: in included file (through ../include/linux/spinlock.h, ../include/linux/mmzone.h, ../include/linux/gfp.h, ../include/linux/umh.h, ../include/linux/kmod.h, ../include/linux/module.h):
../include/linux/bottom_half.h:32:30: warning: context imbalance in 'icmp_reply' - different lock contexts for basic block
../include/linux/bottom_half.h:32:30: warning: context imbalance in '__icmp_send' - different lock contexts for basic block
../net/ipv4/icmp.c:1024:45: warning: cast to restricted __be32
../net/ipv4/icmp.c:1024:45: warning: cast to restricted __be32
../net/ipv4/icmp.c:1024:45: warning: cast to restricted __be32
../net/ipv4/icmp.c:1024:45: warning: cast to restricted __be32
../net/ipv4/icmp.c:1024:45: warning: cast to restricted __be32
../net/ipv4/icmp.c:1024:45: warning: cast to restricted __be32
../net/ipv4/icmp.c:1027:25: warning: cast to restricted __be16
../net/ipv4/icmp.c:1027:25: warning: cast to restricted __be16
../net/ipv4/icmp.c:1027:25: warning: cast to restricted __be16
../net/ipv4/icmp.c:1027:25: warning: cast to restricted __be16
../net/ipv4/icmp.c:1058:29: warning: incorrect type in argument 1 (different address spaces)
../net/ipv4/icmp.c:1058:29:    expected struct list_head const *head
../net/ipv4/icmp.c:1058:29:    got struct list_head [noderef] __rcu *
../net/ipv4/icmp.c: note: in included file (through ../include/linux/spinlock.h, ../include/linux/mmzone.h, ../include/linux/gfp.h, ../include/linux/umh.h, ../include/linux/kmod.h, ../include/linux/module.h):
../include/linux/bottom_half.h:32:30: warning: context imbalance in 'icmp_reply' - different lock contexts for basic block
../include/linux/bottom_half.h:32:30: warning: context imbalance in '__icmp_send' - different lock contexts for basic block
../net/ipv4/icmp.c:1056:16: warning: dereference of noderef expression
net/ipv4/icmp.o: In function `icmp_echo':
icmp.c:(.text+0x123a): undefined reference to `ipv6_dev_find'
make[1]: *** [vmlinux] Error 1
make: *** [__sub-make] Error 2
New errors added