slirp: Implement RFC2132 TFTP server name

This new usernet option can be used to add data for option 66 (tftp
server name) in the BOOTP reply, which is useful in PXE based automatic
OS install such as OpenBSD.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

8 files changed, 38 insertions, 4 deletions

diff --git a/net/slirp.c b/net/slirp.c
index da6c0a1..f6dc039 100644
--- a/net/slirp.c
+++ b/net/slirp.c
@@ -150,6 +150,7 @@ static int net_slirp_init(NetClientState *peer, const char *model,
                           const char *vnameserver, const char *vnameserver6,
                           const char *smb_export, const char *vsmbserver,
                           const char **dnssearch, const char *vdomainname,
+                          const char *tftp_server_name,
                           Error **errp)
 {
     /* default settings according to historic slirp */
@@ -360,6 +361,11 @@ static int net_slirp_init(NetClientState *peer, const char *model,
         return -1;
     }
 
+    if (tftp_server_name && strlen(tftp_server_name) > 255) {
+        error_setg(errp, "'tftp-server-name' parameter cannot exceed 255 bytes");
+        return -1;
+    }
+
     nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
 
     snprintf(nc->info_str, sizeof(nc->info_str),
@@ -370,7 +376,8 @@ static int net_slirp_init(NetClientState *peer, const char *model,
 
     s->slirp = slirp_init(restricted, ipv4, net, mask, host,
                           ipv6, ip6_prefix, vprefix6_len, ip6_host,
-                          vhostname, tftp_export, bootfile, dhcp,
+                          vhostname, tftp_server_name,
+                          tftp_export, bootfile, dhcp,
                           dns, ip6_dns, dnssearch, vdomainname, s);
     QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
 
@@ -907,7 +914,8 @@ int net_init_slirp(const Netdev *netdev, const char *name,
                          user->ipv6_host, user->hostname, user->tftp,
                          user->bootfile, user->dhcpstart,
                          user->dns, user->ipv6_dns, user->smb,
-                         user->smbserver, dnssearch, user->domainname, errp);
+                         user->smbserver, dnssearch, user->domainname,
+                         user->tftp_server_name, errp);
 
     while (slirp_configs) {
         config = slirp_configs;
diff --git a/qapi/net.json b/qapi/net.json
index c86f351..8f99fd9 100644
--- a/qapi/net.json
+++ b/qapi/net.json
@@ -174,6 +174,8 @@
 #
 # @guestfwd: forward guest TCP connections
 #
+# @tftp-server-name: RFC2132 "TFTP server name" string (Since 3.1)
+#
 # Since: 1.2
 ##
 { 'struct': 'NetdevUserOptions',
@@ -198,7 +200,8 @@
     '*smb':       'str',
     '*smbserver': 'str',
     '*hostfwd':   ['String'],
-    '*guestfwd':  ['String'] } }
+    '*guestfwd':  ['String'],
+    '*tftp-server-name': 'str' } }
 
 ##
 # @NetdevTapOptions:
diff --git a/qemu-options.hx b/qemu-options.hx
index 214ce39..08f8516 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1823,7 +1823,7 @@ DEF("netdev", HAS_ARG, QEMU_OPTION_netdev,
     "         [,ipv6[=on|off]][,ipv6-net=addr[/int]][,ipv6-host=addr]\n"
     "         [,restrict=on|off][,hostname=host][,dhcpstart=addr]\n"
     "         [,dns=addr][,ipv6-dns=addr][,dnssearch=domain][,domainname=domain]\n"
-    "         [,tftp=dir][,bootfile=f][,hostfwd=rule][,guestfwd=rule]"
+    "         [,tftp=dir][,tftp-server-name=name][,bootfile=f][,hostfwd=rule][,guestfwd=rule]"
 #ifndef _WIN32
                                              "[,smb=dir[,smbserver=addr]]\n"
 #endif
@@ -2060,6 +2060,11 @@ server. The files in @var{dir} will be exposed as the root of a TFTP server.
 The TFTP client on the guest must be configured in binary mode (use the command
 @code{bin} of the Unix TFTP client).
 
+@item tftp-server-name=@var{name}
+In BOOTP reply, broadcast @var{name} as the "TFTP server name" (RFC2132 option
+66). This can be used to advise the guest to load boot files or configurations
+from a different server than the host address.
+
 @item bootfile=@var{file}
 When using the user mode network stack, broadcast @var{file} as the BOOTP
 filename. In conjunction with @option{tftp}, this can be used to network boot
diff --git a/slirp/bootp.c b/slirp/bootp.c
index 1e8185f..7b1af73 100644
--- a/slirp/bootp.c
+++ b/slirp/bootp.c
@@ -318,6 +318,19 @@ static void bootp_reply(Slirp *slirp, const struct bootp_t *bp)
             }
         }
 
+        if (slirp->tftp_server_name) {
+            val = strlen(slirp->tftp_server_name);
+            if (q + val + 2 >= end) {
+                g_warning("DHCP packet size exceeded, "
+                    "omitting tftp-server-name option.");
+            } else {
+                *q++ = RFC2132_TFTP_SERVER_NAME;
+                *q++ = val;
+                memcpy(q, slirp->tftp_server_name, val);
+                q += val;
+            }
+        }
+
         if (slirp->vdnssearch) {
             val = slirp->vdnssearch_len;
             if (q + val >= end) {
diff --git a/slirp/bootp.h b/slirp/bootp.h
index 3945257..4043489 100644
--- a/slirp/bootp.h
+++ b/slirp/bootp.h
@@ -70,6 +70,7 @@
 #define RFC2132_MAX_SIZE	57
 #define RFC2132_RENEWAL_TIME    58
 #define RFC2132_REBIND_TIME     59
+#define RFC2132_TFTP_SERVER_NAME 66
 
 #define DHCPDISCOVER		1
 #define DHCPOFFER		2
diff --git a/slirp/libslirp.h b/slirp/libslirp.h
index 740408a..42e42e9 100644
--- a/slirp/libslirp.h
+++ b/slirp/libslirp.h
@@ -13,6 +13,7 @@ Slirp *slirp_init(int restricted, bool in_enabled, struct in_addr vnetwork,
                   bool in6_enabled,
                   struct in6_addr vprefix_addr6, uint8_t vprefix_len,
                   struct in6_addr vhost6, const char *vhostname,
+                  const char *tftp_server_name,
                   const char *tftp_path, const char *bootfile,
                   struct in_addr vdhcp_start, struct in_addr vnameserver,
                   struct in6_addr vnameserver6, const char **vdnssearch,
diff --git a/slirp/slirp.c b/slirp/slirp.c
index 5c3bd61..51de41f 100644
--- a/slirp/slirp.c
+++ b/slirp/slirp.c
@@ -283,6 +283,7 @@ Slirp *slirp_init(int restricted, bool in_enabled, struct in_addr vnetwork,
                   bool in6_enabled,
                   struct in6_addr vprefix_addr6, uint8_t vprefix_len,
                   struct in6_addr vhost6, const char *vhostname,
+                  const char *tftp_server_name,
                   const char *tftp_path, const char *bootfile,
                   struct in_addr vdhcp_start, struct in_addr vnameserver,
                   struct in6_addr vnameserver6, const char **vdnssearch,
@@ -321,6 +322,7 @@ Slirp *slirp_init(int restricted, bool in_enabled, struct in_addr vnetwork,
     slirp->vdhcp_startaddr = vdhcp_start;
     slirp->vnameserver_addr = vnameserver;
     slirp->vnameserver_addr6 = vnameserver6;
+    slirp->tftp_server_name = g_strdup(tftp_server_name);
 
     if (vdnssearch) {
         translate_dnssearch(slirp, vdnssearch);
diff --git a/slirp/slirp.h b/slirp/slirp.h
index 10b4108..b80725a 100644
--- a/slirp/slirp.h
+++ b/slirp/slirp.h
@@ -212,6 +212,7 @@ struct Slirp {
     /* tftp states */
     char *tftp_prefix;
     struct tftp_session tftp_sessions[TFTP_SESSIONS_MAX];
+    char *tftp_server_name;
 
     ArpTable arp_table;
     NdpTable ndp_table;