Re: [Qemu-devel] [PATCHv7 9/9] qapi-schema, qemu-options & slirp: Adding Qemu options for IPv6 addresses

[Thomas Huth <thuth@redhat.com>]

On 08.02.2016 11:28, Samuel Thibault wrote:
> From: Yann Bordenave <meow@meowstars.org>
> 
> This patch adds parameters to manage some new options in the qemu -net
> command.
> Slirp IPv6 address, network prefix, and DNS IPv6 address can be given in
> argument to the qemu command.
> Defaults parameters are respectively fec0::2, fec0::, /64 and fec0::3.
> 
> Signed-off-by: Yann Bordenave <meow@meowstars.org>
> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
> ---
>  net/net.c        | 31 +++++++++++++++++++++++++++++++
>  net/slirp.c      | 50 ++++++++++++++++++++++++++++++++++++++++++++------
>  qapi-schema.json | 40 ++++++++++++++++++++++++++--------------
>  qemu-options.hx  | 18 ++++++++++++++++--
>  slirp/libslirp.h |  8 +++++---
>  slirp/slirp.c    | 16 +++++++++-------
>  6 files changed, 131 insertions(+), 32 deletions(-)
...
> diff --git a/net/slirp.c b/net/slirp.c
> index 6b51fbc..076dd27 100644
> --- a/net/slirp.c
> +++ b/net/slirp.c
> @@ -135,17 +135,23 @@ static NetClientInfo net_slirp_info = {
>  static int net_slirp_init(NetClientState *peer, const char *model,
>                            const char *name, int restricted,
>                            const char *vnetwork, const char *vhost,
> +                          const char *vprefix6, int vprefix6_len,
> +                          const char *vhost6,
>                            const char *vhostname, const char *tftp_export,
>                            const char *bootfile, const char *vdhcp_start,
> -                          const char *vnameserver, const char *smb_export,
> -                          const char *vsmbserver, const char **dnssearch)
> +                          const char *vnameserver, const char *vnameserver6,
> +                          const char *smb_export, const char *vsmbserver,
> +                          const char **dnssearch)
>  {
>      /* default settings according to historic slirp */
>      struct in_addr net  = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
>      struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
>      struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
> +    struct in6_addr ip6_prefix;
> +    struct in6_addr ip6_host;
>      struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */
>      struct in_addr dns  = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */
> +    struct in6_addr ip6_dns;
>  #ifndef _WIN32
>      struct in_addr smbsrv = { .s_addr = 0 };
>  #endif
> @@ -213,6 +219,27 @@ static int net_slirp_init(NetClientState *peer, const char *model,
>          return -1;
>      }
>  
> +    if (!vprefix6) {
> +        vprefix6 = "fec0::";

Site-local prefixes have already been deprecated (see rfc3879) ... would
it be feasible to use a ULA prefix instead (fd00::/8,
see rfc4193) ?

 Thomas