netdev - Re: [PATCH net-next] icmp: standardize naming of RFC 8335 PROBE constants

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Date:   Mon, 26 Apr 2021 23:03:43 -0500
From:   Andreas Roeseler <andreas.a.roeseler@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        yoshfuji@...ux-ipv6.org, dsahern@...nel.org, kuba@...nel.org
Subject: Re: [PATCH net-next] icmp: standardize naming of RFC 8335 PROBE
 constants

On Mon, 2021-04-26 at 20:54 -0700, Stephen Hemminger wrote:
> On Mon, 26 Apr 2021 22:40:02 -0500
> Andreas Roeseler <andreas.a.roeseler@...il.com> wrote:
> 
> > The current definitions of constants for PROBE are inconsistent,
> > with
> > some beginning with ICMP and others with simply EXT. This patch
> > attempts to standardize the naming conventions of the constants for
> > PROBE, and update the relevant definitions in net/ipv4/icmp.c.
> > 
> > Similarly, the definitions for the code field (previously
> > ICMP_EXT_MAL_QUERY, etc) use the same prefixes as the type field.
> > This
> > patch adds _CODE_ to the prefix to clarify the distinction of these
> > constants.
> > 
> > Signed-off-by: Andreas Roeseler <andreas.a.roeseler@...il.com>
> > ---
> >  include/uapi/linux/icmp.h | 28 ++++++++++++++--------------
> >  net/ipv4/icmp.c           | 16 ++++++++--------
> >  2 files changed, 22 insertions(+), 22 deletions(-)
> > 
> > diff --git a/include/uapi/linux/icmp.h b/include/uapi/linux/icmp.h
> > index 222325d1d80e..c1da8244c5e1 100644
> > --- a/include/uapi/linux/icmp.h
> > +++ b/include/uapi/linux/icmp.h
> > @@ -70,22 +70,22 @@
> >  #define ICMP_EXC_FRAGTIME      1       /* Fragment Reass time
> > exceeded */
> >  
> >  /* Codes for EXT_ECHO (PROBE) */
> > -#define ICMP_EXT_ECHO          42
> > -#define ICMP_EXT_ECHOREPLY     43
> > -#define ICMP_EXT_MAL_QUERY     1       /* Malformed Query */
> > -#define ICMP_EXT_NO_IF         2       /* No such Interface */
> > -#define ICMP_EXT_NO_TABLE_ENT  3       /* No such Table Entry */
> > -#define ICMP_EXT_MULT_IFS      4       /* Multiple Interfaces
> > Satisfy Query */
> > +#define ICMP_EXT_ECHO                  42
> > +#define ICMP_EXT_ECHOREPLY             43
> > +#define ICMP_EXT_CODE_MAL_QUERY                1       /*
> > Malformed Query */
> > +#define ICMP_EXT_CODE_NO_IF            2       /* No such
> > Interface */
> > +#define ICMP_EXT_CODE_NO_TABLE_ENT     3       /* No such Table
> > Entry */
> > +#define ICMP_EXT_CODE_MULT_IFS         4       /* Multiple
> > Interfaces Satisfy Query */
> >  
> >  /* Constants for EXT_ECHO (PROBE) */
> > -#define EXT_ECHOREPLY_ACTIVE   (1 << 2)/* active bit in reply
> > message */
> > -#define EXT_ECHOREPLY_IPV4     (1 << 1)/* ipv4 bit in reply
> > message */
> > -#define EXT_ECHOREPLY_IPV6     1       /* ipv6 bit in reply
> > message */
> > -#define EXT_ECHO_CTYPE_NAME    1
> > -#define EXT_ECHO_CTYPE_INDEX   2
> > -#define EXT_ECHO_CTYPE_ADDR    3
> > -#define ICMP_AFI_IP            1       /* Address Family
> > Identifier for ipv4 */
> > -#define ICMP_AFI_IP6           2       /* Address Family
> > Identifier for ipv6 */
> > +#define ICMP_EXT_ECHOREPLY_ACTIVE      (1 << 2)/* active bit in
> > reply message */
> > +#define ICMP_EXT_ECHOREPLY_IPV4                (1 << 1)/* ipv4 bit
> > in reply message */
> > +#define ICMP_EXT_ECHOREPLY_IPV6                1       /* ipv6 bit
> > in reply message */
> > +#define ICMP_EXT_ECHO_CTYPE_NAME       1
> > +#define ICMP_EXT_ECHO_CTYPE_INDEX      2
> > +#define ICMP_EXT_ECHO_CTYPE_ADDR       3
> > +#define ICMP_AFI_IP                    1       /* Address Family
> > Identifier for ipv4 */
> > +#define ICMP_AFI_IP6                   2       /* Address Family
> > Identifier for ipv6 */
> 
> You can't just remove the old constants. They have to stay there.
> The #defines are part of the Linux API by now.

Even in the case where these constants were added less than a month ago
(3/30/2021) and are not used elsewhere in the kernel? I agree with your
statement in the general sense, but I thought I could get ahead of it
in this case and update them.

For reference, they were added in commit
2b246b2569cd2ac6ff700d0dce56b8bae29b1842