[Qemu-devel] [PATCH 18/18] qapi-schema, qemu-options & slirp: Adding Qemu options for IPv6 addresses

[Samuel Thibault]

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 <address@hidden>
Signed-off-by: Samuel Thibault <address@hidden>
---
 net/net.c        | 31 +++++++++++++++++++++++++++++++
 net/slirp.c      | 46 ++++++++++++++++++++++++++++++++++++++++------
 qapi-schema.json | 40 ++++++++++++++++++++++++++--------------
 qemu-options.hx  | 18 ++++++++++++++++--
 slirp/libslirp.h |  8 +++++---
 slirp/slirp.c    | 20 +++++++++-----------
 6 files changed, 127 insertions(+), 36 deletions(-)

diff --git a/net/net.c b/net/net.c
index 28a5597..9c90f34 100644
--- a/net/net.c
+++ b/net/net.c
@@ -987,6 +987,37 @@ int net_client_init(QemuOpts *opts, int is_netdev, Error 
**errp)
     int ret = -1;
 
     {
+        /* Parse convenience option format ip6-net=fec0::0[/64] */
+        const char *ip6_net = qemu_opt_get(opts, "ip6-net");
+
+        if (ip6_net) {
+            char buf[strlen(ip6_net)+1];
+
+            if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
+                /* Default 64bit prefix length.  */
+                qemu_opt_set(opts, "ip6-prefix", ip6_net, &error_abort);
+                qemu_opt_set_number(opts, "ip6-prefixlen", 64, &error_abort);
+            } else {
+                /* User-specified prefix length.  */
+                int len;
+                char *end;
+
+                qemu_opt_set(opts, "ip6-prefix", buf, &error_abort);
+                len = strtol(ip6_net, &end, 10);
+
+                if (*end != '\0') {
+                    error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
+                              "ip6-prefix", "a number");
+                } else {
+                    qemu_opt_set_number(opts, "ip6-prefixlen", len,
+                                        &error_abort);
+                }
+            }
+            qemu_opt_unset(opts, "ip6-net");
+        }
+    }
+
+    {
         OptsVisitor *ov = opts_visitor_new(opts);
 
         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
diff --git a/net/slirp.c b/net/slirp.c
index 7657b38..b9fa5d2 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 +219,24 @@ static int net_slirp_init(NetClientState *peer, const char 
*model,
         return -1;
     }
 
+    if (!vprefix6)
+        vprefix6 = "fec0::";
+    if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
+        return -1;
+    }
+
+    if (!vprefix6_len)
+        vprefix6_len = 64;
+    if (vprefix6_len < 0 || vprefix6_len > 128) {
+        return -1;
+    }
+
+    if (!vhost6)
+        vhost6 = "fec0::2";
+    if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
+        return -1;
+    }
+
     if (vnameserver && !inet_aton(vnameserver, &dns)) {
         return -1;
     }
@@ -221,6 +245,12 @@ static int net_slirp_init(NetClientState *peer, const char 
*model,
         return -1;
     }
 
+    if (!vnameserver6)
+        vnameserver6 = "fec0::3";
+    if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
+        return -1;
+    }
+
     if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
         return -1;
     }
@@ -243,8 +273,10 @@ static int net_slirp_init(NetClientState *peer, const char 
*model,
 
     s = DO_UPCAST(SlirpState, nc, nc);
 
-    s->slirp = slirp_init(restricted, net, mask, host, vhostname,
-                          tftp_export, bootfile, dhcp, dns, dnssearch, s);
+    s->slirp = slirp_init(restricted, net, mask, host,
+                          ip6_prefix, vprefix6_len, ip6_host,
+                          vhostname, tftp_export, bootfile, dhcp,
+                          dns, ip6_dns, dnssearch, s);
     QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
 
     for (config = slirp_configs; config; config = config->next) {
@@ -761,8 +793,10 @@ int net_init_slirp(const NetClientOptions *opts, const 
char *name,
     net_init_slirp_configs(user->guestfwd, 0);
 
     ret = net_slirp_init(peer, "user", name, user->q_restrict, vnet,
-                         user->host, user->hostname, user->tftp,
-                         user->bootfile, user->dhcpstart, user->dns, user->smb,
+                         user->host, user->ip6_prefix, user->ip6_prefixlen,
+                         user->ip6_host, user->hostname, user->tftp,
+                         user->bootfile, user->dhcpstart,
+                         user->dns, user->ip6_dns, user->smb,
                          user->smbserver, dnssearch);
 
     while (slirp_configs) {
diff --git a/qapi-schema.json b/qapi-schema.json
index 4342a08..9f92995 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -2204,6 +2204,14 @@
 # @dnssearch: #optional list of DNS suffixes to search, passed as DHCP option
 #             to the guest
 #
+# @ip6-prefix: #optional IPv6 network prefix (since 2.5)
+#
+# @ip6-prefixlen: #optional IPv6 network prefix length (since 2.5)
+#
+# @ip6-host: #optional guest-visible IPv6 address of the host (since 2.5)
+#
+# @ip6-dns: #optional guest-visible IPv6 address of the virtual nameserver 
(since 2.5)
+#
 # @smb: #optional root directory of the built-in SMB server
 #
 # @smbserver: #optional IP address of the built-in SMB server
@@ -2217,20 +2225,24 @@
 ##
 { 'struct': 'NetdevUserOptions',
   'data': {
-    '*hostname':  'str',
-    '*restrict':  'bool',
-    '*ip':        'str',
-    '*net':       'str',
-    '*host':      'str',
-    '*tftp':      'str',
-    '*bootfile':  'str',
-    '*dhcpstart': 'str',
-    '*dns':       'str',
-    '*dnssearch': ['String'],
-    '*smb':       'str',
-    '*smbserver': 'str',
-    '*hostfwd':   ['String'],
-    '*guestfwd':  ['String'] } }
+    '*hostname':        'str',
+    '*restrict':        'bool',
+    '*ip':              'str',
+    '*net':             'str',
+    '*host':            'str',
+    '*tftp':            'str',
+    '*bootfile':        'str',
+    '*dhcpstart':       'str',
+    '*dns':             'str',
+    '*dnssearch':       ['String'],
+    '*ip6-prefix':      'str',
+    '*ip6-prefixlen':   'int',
+    '*ip6-host':        'str',
+    '*ip6-dns':         'str',
+    '*smb':             'str',
+    '*smbserver':       'str',
+    '*hostfwd':         ['String'],
+    '*guestfwd':        ['String'] } }
 
 ##
 # @NetdevTapOptions
diff --git a/qemu-options.hx b/qemu-options.hx
index 77f5853..96f4b29 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1459,8 +1459,9 @@ DEF("smb", HAS_ARG, QEMU_OPTION_smb, "", QEMU_ARCH_ALL)
 
 DEF("netdev", HAS_ARG, QEMU_OPTION_netdev,
 #ifdef CONFIG_SLIRP
-    "-netdev user,id=str[,net=addr[/mask]][,host=addr][,restrict=on|off]\n"
-    "         
[,hostname=host][,dhcpstart=addr][,dns=addr][,dnssearch=domain][,tftp=dir]\n"
+    "-netdev user,id=str[,net=addr[/mask]][,host=addr][,ip6-net=addr[/int]]\n"
+    "         
[,ip6-host=addr][,restrict=on|off][,hostname=host][,dhcpstart=addr]\n"
+    "         [,dns=addr][,ip6-dns=addr][,dnssearch=domain][,tftp=dir]\n"
     "         [,bootfile=f][,hostfwd=rule][,guestfwd=rule]"
 #ifndef _WIN32
                                              "[,smb=dir[,smbserver=addr]]\n"
@@ -1617,6 +1618,14 @@ either in the form a.b.c.d or as number of valid 
top-most bits. Default is
 Specify the guest-visible address of the host. Default is the 2nd IP in the
 guest network, i.e. x.x.x.2.
 
address@hidden address@hidden/@var{int}]
+Set IPv6 network address the guest will see. Optionally specify the prefix
+size, as number of valid top-most bits. Default is fec0::/64.
+
address@hidden address@hidden
+Specify the guest-visible IPv6 address of the host. Default is the 2nd IPv6 in
+the guest network, i.e. xxxx::2.
+
 @item restrict=on|off
 If this option is enabled, the guest will be isolated, i.e. it will not be
 able to contact the host and no guest IP packets will be routed over the host
@@ -1634,6 +1643,11 @@ Specify the guest-visible address of the virtual 
nameserver. The address must
 be different from the host address. Default is the 3rd IP in the guest network,
 i.e. x.x.x.3.
 
address@hidden address@hidden
+Specify the guest-visible address of the IPv6 virtual nameserver. The address
+must be different from the host address. Default is the 3rd IP in the guest
+network, i.e. xxxx::3.
+
 @item address@hidden
 Provides an entry for the domain-search list sent by the built-in
 DHCP server. More than one domain suffix can be transmitted by specifying
diff --git a/slirp/libslirp.h b/slirp/libslirp.h
index 5bdcbd5..c4b25c9 100644
--- a/slirp/libslirp.h
+++ b/slirp/libslirp.h
@@ -10,9 +10,11 @@ int get_dns_addr(struct in_addr *pdns_addr);
 
 Slirp *slirp_init(int restricted, struct in_addr vnetwork,
                   struct in_addr vnetmask, struct in_addr vhost,
-                  const char *vhostname, const char *tftp_path,
-                  const char *bootfile, struct in_addr vdhcp_start,
-                  struct in_addr vnameserver, const char **vdnssearch,
+                  struct in6_addr vprefix_addr6, uint8_t vprefix_len,
+                  struct in6_addr vhost6, const char *vhostname,
+                  const char *tftp_path, const char *bootfile,
+                  struct in_addr vdhcp_start, struct in_addr vnameserver,
+                  struct in6_addr vnameserver6, const char **vdnssearch,
                   void *opaque);
 void slirp_cleanup(Slirp *slirp);
 
diff --git a/slirp/slirp.c b/slirp/slirp.c
index b7c5f2c..3b0e218 100644
--- a/slirp/slirp.c
+++ b/slirp/slirp.c
@@ -199,9 +199,11 @@ static int slirp_state_load(QEMUFile *f, void *opaque, int 
version_id);
 
 Slirp *slirp_init(int restricted, struct in_addr vnetwork,
                   struct in_addr vnetmask, struct in_addr vhost,
-                  const char *vhostname, const char *tftp_path,
-                  const char *bootfile, struct in_addr vdhcp_start,
-                  struct in_addr vnameserver, const char **vdnssearch,
+                  struct in6_addr vprefix_addr6, uint8_t vprefix_len,
+                  struct in6_addr vhost6, const char *vhostname,
+                  const char *tftp_path, const char *bootfile,
+                  struct in_addr vdhcp_start, struct in_addr vnameserver,
+                  struct in6_addr vnameserver6, const char **vdnssearch,
                   void *opaque)
 {
     Slirp *slirp = g_malloc0(sizeof(Slirp));
@@ -220,12 +222,9 @@ Slirp *slirp_init(int restricted, struct in_addr vnetwork,
     slirp->vnetwork_addr = vnetwork;
     slirp->vnetwork_mask = vnetmask;
     slirp->vhost_addr = vhost;
-    /* :TODO:maethor:130311: Use a parameter passed to the function */
-    inet_pton(AF_INET6, "fec0::0", &slirp->vprefix_addr6);
-    /* :TODO:maethor:130311: Use a parameter passed to the function */
-    slirp->vprefix_len = 64;
-    /* :TODO:maethor:130311: Use a parameter passed to the function */
-    inet_pton(AF_INET6, "fec0::2", &slirp->vhost_addr6);
+    slirp->vprefix_addr6 = vprefix_addr6;
+    slirp->vprefix_len = vprefix_len;
+    slirp->vhost_addr6 = vhost6;
     if (vhostname) {
         pstrcpy(slirp->client_hostname, sizeof(slirp->client_hostname),
                 vhostname);
@@ -234,8 +233,7 @@ Slirp *slirp_init(int restricted, struct in_addr vnetwork,
     slirp->bootp_filename = g_strdup(bootfile);
     slirp->vdhcp_startaddr = vdhcp_start;
     slirp->vnameserver_addr = vnameserver;
-    /* :TODO:maethor:130311: Use a parameter passed to the function */
-    inet_pton(AF_INET6, "fec0::3", &slirp->vnameserver_addr6);
+    slirp->vnameserver_addr6 = vnameserver6;
 
     if (vdnssearch) {
         translate_dnssearch(slirp, vdnssearch);
-- 
2.4.6