netdev - Re: [PATCH V3 net-next 1/5] icmp: add support for RFC 8335 PROBE

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Date:   Sun, 21 Feb 2021 23:38:52 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Andreas Roeseler <andreas.a.roeseler@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        dsahern@...nel.org, Jakub Kicinski <kuba@...nel.org>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH V3 net-next 1/5] icmp: add support for RFC 8335 PROBE

On Wed, Feb 17, 2021 at 1:10 PM Andreas Roeseler
<andreas.a.roeseler@...il.com> wrote:
>
> Add definitions for PROBE ICMP types and codes.
>
> Add AFI definitions for IP and IPV6 as specified by IANA
>
> Add a struct to represent the additional header when probing by IP
> address (ctype == 3) for use in parsing incoming PROBE messages.
>
> Add a struct to represent the entire Interface Identification Object
> (IIO) section of an incoming PROBE packet
>
> Signed-off-by: Andreas Roeseler <andreas.a.roeseler@...il.com>
> ---
> Changes since v1:
>  - Add AFI_IP and AFI_IP6 definitions
>
> Changes since v2:
> Suggested by Willem de Brujin <willemdebrujin.kernel@...il.com>
>  - Add prefix for PROBE specific defined variables
>  - Create struct icmp_ext_echo_iio for parsing incoming packet
> ---
>  include/uapi/linux/icmp.h | 40 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 40 insertions(+)
>
> diff --git a/include/uapi/linux/icmp.h b/include/uapi/linux/icmp.h
> index fb169a50895e..166ca77561de 100644
> --- a/include/uapi/linux/icmp.h
> +++ b/include/uapi/linux/icmp.h
> @@ -66,6 +66,23 @@
>  #define ICMP_EXC_TTL           0       /* TTL count exceeded           */
>  #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 */
> +
> +/* constants for EXT_ECHO (PROBE) */
> +#define EXT_ECHOREPLY_ACTIVE   (1 << 2)/* position of active flag in reply */
> +#define EXT_ECHOREPLY_IPV4     (1 << 1)/* position of ipv4 flag in reply */
> +#define EXT_ECHOREPLY_IPV6     1       /* position of ipv6 flag in reply */
> +#define EXT_ECHO_CTYPE_NAME    1
> +#define EXT_ECHO_CTYPE_INDEX   2
> +#define EXT_ECHO_CTYPE_ADDR    3
> +#define EXT_ECHO_AFI_IP                1       /* Address Family Identifier for IPV4 */
> +#define EXT_ECHO_AFI_IP6       2       /* Address Family Identifier for IPV6 */
>
>  struct icmphdr {
>    __u8         type;
> @@ -118,4 +135,27 @@ struct icmp_extobj_hdr {
>         __u8            class_type;
>  };
>
> +/* RFC 8335: 2.1 Header for C-type 3 payload */
> +struct icmp_ext_echo_ctype3_hdr {
> +       __u16           afi;
> +       __u8            addrlen;
> +       __u8            reserved;
> +};
> +
> +/* RFC 8335: Interface Identification Object */
> +struct icmp_ext_echo_iio {
> +       struct icmp_extobj_hdr  extobj_hdr;
> +       union {
> +               __u32   ifIndex;

please no camelcase.

> +               char name;

why single char?

> +               struct {
> +                       struct icmp_ext_echo_ctype3_hdr ctype3_hdr;
> +                       union {
> +                               __be32          ipv4_addr;

perhaps struct in_addr

> +                               struct in6_addr ipv6_addr;
> +                       } ip_addr;
> +               } addr;
> +       } ident;
> +};
> +
>  #endif /* _UAPI_LINUX_ICMP_H */
> --
> 2.25.1
>