[v4] Support for UDP unicast network backend

Signed-off-by: Benjamin MARSILI <mlspirat42@gmail.com>
---
Added my last name. Check that localaddr= is supplied with udp=,
it crashed when misused...

 net.c           |    6 +++-
 net/socket.c    |   77 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 qemu-options.hx |    2 +
 3 files changed, 82 insertions(+), 3 deletions(-)

--
1.7.6

On 01/10/2012 06:20 PM, Benjamin wrote:
> Signed-off-by: Benjamin MARSILI<mlspirat42@gmail.com>

Applied.  Thanks.

Regards,

Anthony Liguori

> ---
> Added my last name. Check that localaddr= is supplied with udp=,
> it crashed when misused...
>
>   net.c           |    6 +++-
>   net/socket.c    |   77 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
>   qemu-options.hx |    2 +
>   3 files changed, 82 insertions(+), 3 deletions(-)
>
> diff --git a/net.c b/net.c
> index f7bebf8..2b0f766 100644
> --- a/net.c
> +++ b/net.c
> @@ -1000,7 +1000,11 @@ static const struct {
>               }, {
>                   .name = "localaddr",
>                   .type = QEMU_OPT_STRING,
> -                .help = "source address for multicast packets",
> +                .help = "source address and port for multicast and udp packets",
> +            }, {
> +                .name = "udp",
> +                .type = QEMU_OPT_STRING,
> +                .help = "UDP unicast address and port number",
>               },
>               { /* end of list */ }
>           },
> diff --git a/net/socket.c b/net/socket.c
> index c9d70d3..d4c2002 100644
> --- a/net/socket.c
> +++ b/net/socket.c
> @@ -534,6 +534,57 @@ static int net_socket_mcast_init(VLANState *vlan,
>
>   }
>
> +static int net_socket_udp_init(VLANState *vlan,
> +                                 const char *model,
> +                                 const char *name,
> +                                 const char *rhost,
> +                                 const char *lhost)
> +{
> +    NetSocketState *s;
> +    int fd, val, ret;
> +    struct sockaddr_in laddr, raddr;
> +
> +    if (parse_host_port(&laddr, lhost)<  0) {
> +        return -1;
> +    }
> +
> +    if (parse_host_port(&raddr, rhost)<  0) {
> +        return -1;
> +    }
> +
> +    fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
> +    if (fd<  0) {
> +        perror("socket(PF_INET, SOCK_DGRAM)");
> +        return -1;
> +    }
> +    val = 1;
> +    ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
> +                   (const char *)&val, sizeof(val));
> +    if (ret<  0) {
> +        perror("setsockopt(SOL_SOCKET, SO_REUSEADDR)");
> +        closesocket(fd);
> +        return -1;
> +    }
> +    ret = bind(fd, (struct sockaddr *)&laddr, sizeof(laddr));
> +    if (ret<  0) {
> +        perror("bind");
> +        closesocket(fd);
> +        return -1;
> +    }
> +
> +    s = net_socket_fd_init(vlan, model, name, fd, 0);
> +    if (!s) {
> +        return -1;
> +    }
> +
> +    s->dgram_dst = raddr;
> +
> +    snprintf(s->nc.info_str, sizeof(s->nc.info_str),
> +             "socket: udp=%s:%d",
> +             inet_ntoa(raddr.sin_addr), ntohs(raddr.sin_port));
> +    return 0;
> +}
> +
>   int net_init_socket(QemuOpts *opts,
>                       Monitor *mon,
>                       const char *name,
> @@ -606,10 +657,32 @@ int net_init_socket(QemuOpts *opts,
>           if (net_socket_mcast_init(vlan, "socket", name, mcast, localaddr) == -1) {
>               return -1;
>           }
> +    } else if (qemu_opt_get(opts, "udp")) {
> +        const char *udp, *localaddr;
> +
> +        if (qemu_opt_get(opts, "fd") ||
> +            qemu_opt_get(opts, "connect") ||
> +            qemu_opt_get(opts, "listen") ||
> +            qemu_opt_get(opts, "mcast")) {
> +            error_report("fd=, connect=, listen=\
> +                         and mcast= is invalid with udp=");
> +            return -1;
> +        }
> +
> +        udp = qemu_opt_get(opts, "udp");
> +        localaddr = qemu_opt_get(opts, "localaddr");
> +        if (localaddr == NULL) {
> +                error_report("localaddr= is mandatory with udp=");
> +                return -1;
> +        }
> +
> +        if (net_socket_udp_init(vlan, "udp", name, udp, localaddr) == -1) {
> +            return -1;
> +        }
>       } else {
> -        error_report("-socket requires fd=, listen=, connect= or mcast=");
> +        error_report("-socket requires fd=, listen=, \
> +                     connect=, mcast= or udp=");
>           return -1;
>       }
> -
>       return 0;
>   }
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 7903e5c..6295cde 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -1239,6 +1239,8 @@ DEF("net", HAS_ARG, QEMU_OPTION_net,
>       "-net socket[,vlan=n][,name=str][,fd=h][,mcast=maddr:port[,localaddr=addr]]\n"
>       "                connect the vlan 'n' to multicast maddr and port\n"
>       "                use 'localaddr=addr' to specify the host address to send packets from\n"
> +    "-net socket[,vlan=n][,name=str][,fd=h][,udp=host:port][,localaddr=host:port]\n"
> +    "                connect the vlan 'n' to another VLAN using an UDP tunnel\n"
>   #ifdef CONFIG_VDE
>       "-net vde[,vlan=n][,name=str][,sock=socketpath][,port=n][,group=groupname][,mode=octalmode]\n"
>       "                connect the vlan 'n' to port 'n' of a vde switch running\n"
> --
> 1.7.6
>
>
>