Re: [PATCH v2] net: fix multicast support with BSD (macOS) socket implementations

[Jason Wang]

On Wed, May 18, 2022 at 3:40 PM Vitaly Cheptsov <cheptsov@ispras.ru> wrote:
>

Hi Vitaly:

We need a changelog to describe why we need this.

Thanks

> Cc: Jason Wang <jasowang@redhat.com>
> Cc: Daniel P. Berrange <berrange@redhat.com>
> Cc: Philippe Mathieu-Daudé <f4bug@amsat.org>
> Signed-off-by: Vitaly Cheptsov <cheptsov@ispras.ru>
> ---
>  net/socket.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
>
> diff --git a/net/socket.c b/net/socket.c
> index bfd8596250..583f788a22 100644
> --- a/net/socket.c
> +++ b/net/socket.c
> @@ -239,6 +239,22 @@ static int net_socket_mcast_create(struct sockaddr_in 
> *mcastaddr,
>          return -1;
>      }
>
> +#ifdef __APPLE__
> +    val = 1;
> +    ret = qemu_setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &val, sizeof(val));
> +    if (ret < 0) {
> +        error_setg_errno(errp, errno,
> +                         "can't set socket option SO_REUSEPORT");
> +        goto fail;
> +    }
> +
> +    struct sockaddr_in bindaddr;
> +    memset(&bindaddr, 0, sizeof(bindaddr));
> +    bindaddr.sin_family = AF_INET;
> +    bindaddr.sin_addr.s_addr = htonl(INADDR_ANY);
> +    bindaddr.sin_port = mcastaddr->sin_port;
> +    ret = bind(fd, (struct sockaddr *)&bindaddr, sizeof(bindaddr));
> +#else
>      /* Allow multiple sockets to bind the same multicast ip and port by 
> setting
>       * SO_REUSEADDR. This is the only situation where SO_REUSEADDR should be 
> set
>       * on windows. Use socket_set_fast_reuse otherwise as it sets 
> SO_REUSEADDR
> @@ -253,6 +269,8 @@ static int net_socket_mcast_create(struct sockaddr_in 
> *mcastaddr,
>      }
>
>      ret = bind(fd, (struct sockaddr *)mcastaddr, sizeof(*mcastaddr));
> +#endif
> +
>      if (ret < 0) {
>          error_setg_errno(errp, errno, "can't bind ip=%s to socket",
>                           inet_ntoa(mcastaddr->sin_addr));
> --
> 2.32.1 (Apple Git-133)
>