The slirp dhcp-server normally returns its own address as tftp
nextserver for netbooting. This patch makes that address
configurable, so it is possible to use an external tftp boot-
environment.
Signed-off-by: Bas van Sisseren <b...@quarantainenet.nl>
---
net/slirp.c | 10 ++++++++--
qapi-schema.json | 3 +++
qemu-options.hx | 5 ++++-
slirp/bootp.c | 6 +++++-
slirp/libslirp.h | 1 +
slirp/slirp.c | 2 ++
slirp/slirp.h | 1 +
7 files changed, 24 insertions(+), 4 deletions(-)
diff --git a/net/slirp.c b/net/slirp.c
index 124e953..f3e239c 100644
--- a/net/slirp.c
+++ b/net/slirp.c
@@ -136,6 +136,7 @@ static int net_slirp_init(NetClientState *peer, const char
*model,
const char *vnetwork, const char *vhost,
const char *vhostname, const char *tftp_export,
const char *bootfile, const char *vdhcp_start,
+ const char *vnextserver,
const char *vnameserver, const char *smb_export,
const char *vsmbserver, const char **dnssearch)
{
@@ -145,6 +146,7 @@ static int net_slirp_init(NetClientState *peer, const char
*model,
struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
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 in_addr nxtsrv = { .s_addr = 0 };
#ifndef _WIN32
struct in_addr smbsrv = { .s_addr = 0 };
#endif
@@ -228,6 +230,10 @@ static int net_slirp_init(NetClientState *peer, const char
*model,
return -1;
}
+ if (vnextserver && !inet_aton(vnextserver, &nxtsrv)) {
+ return -1;
+ }
+
#ifndef _WIN32
if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
return -1;
@@ -243,7 +249,7 @@ 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);
+ tftp_export, bootfile, dhcp, nxtsrv, dns, dnssearch,
s);
QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
for (config = slirp_configs; config; config = config->next) {
@@ -751,7 +757,7 @@ int net_init_slirp(const NetClientOptions *opts, const char
*name,
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->bootfile, user->dhcpstart, user->nextserver,
user->dns, user->smb,
user->smbserver, dnssearch);
while (slirp_configs) {
diff --git a/qapi-schema.json b/qapi-schema.json
index a80ee40..a8e2c3d 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -2537,6 +2537,8 @@
# @dhcpstart: #optional the first of the 16 IPs the built-in DHCP server can
# assign
#
+# @nextserver: #optional IP address of BOOTP server
+#
# @dns: #optional guest-visible address of the virtual nameserver
#
# @dnssearch: #optional list of DNS suffixes to search, passed as DHCP option
@@ -2563,6 +2565,7 @@
'*tftp': 'str',
'*bootfile': 'str',
'*dhcpstart': 'str',
+ '*nextserver': 'str',
'*dns': 'str',
'*dnssearch': ['String'],
'*smb': 'str',
diff --git a/qemu-options.hx b/qemu-options.hx
index 8355f9b..8afe42a 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1350,7 +1350,7 @@ DEF("net", HAS_ARG, QEMU_OPTION_net,
#ifdef CONFIG_SLIRP
"-net
user[,vlan=n][,name=str][,net=addr[/mask]][,host=addr][,restrict=on|off]\n"
"
[,hostname=host][,dhcpstart=addr][,dns=addr][,dnssearch=domain][,tftp=dir]\n"
- " [,bootfile=f][,hostfwd=rule][,guestfwd=rule]"
+ " [,bootfile=f][,nextserver=addr][,hostfwd=rule][,guestfwd=rule]"
#ifndef _WIN32
"[,smb=dir[,smbserver=addr]]\n"
#endif
@@ -1498,6 +1498,9 @@ 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
a guest from a local directory.
+@item nextserver=@var{addr}
+Specify the IP address of the TFTP server.
+
Example (using pxelinux):
@example
qemu-system-i386 -hda linux.img -boot n -net
user,tftp=/path/to/tftp/files,bootfile=/pxelinux.0
diff --git a/slirp/bootp.c b/slirp/bootp.c
index b7db9fa..d2e89d6 100644
--- a/slirp/bootp.c
+++ b/slirp/bootp.c
@@ -227,7 +227,11 @@ static void bootp_reply(Slirp *slirp, const struct bootp_t
*bp)
memcpy(rbp->bp_hwaddr, bp->bp_hwaddr, ETH_ALEN);
rbp->bp_yiaddr = daddr.sin_addr; /* Client IP address */
- rbp->bp_siaddr = saddr.sin_addr; /* Server IP address */
+ if (slirp->vnext_server.s_addr == 0) {
+ rbp->bp_siaddr = saddr.sin_addr; /* Server IP address */
+ } else {
+ rbp->bp_siaddr = slirp->vnext_server; /* Next-Server address */
+ }
q = rbp->bp_vend;
memcpy(q, rfc1533_cookie, 4);
diff --git a/slirp/libslirp.h b/slirp/libslirp.h
index ceabff8..c3d800b 100644
--- a/slirp/libslirp.h
+++ b/slirp/libslirp.h
@@ -12,6 +12,7 @@ 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 vnext_server,
struct in_addr vnameserver, const char **vdnssearch,
void *opaque);
void slirp_cleanup(Slirp *slirp);
diff --git a/slirp/slirp.c b/slirp/slirp.c
index 80b28ea..35f2afd 100644
--- a/slirp/slirp.c
+++ b/slirp/slirp.c
@@ -200,6 +200,7 @@ 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 vnext_server,
struct in_addr vnameserver, const char **vdnssearch,
void *opaque)
{
@@ -225,6 +226,7 @@ Slirp *slirp_init(int restricted, struct in_addr vnetwork,
slirp->tftp_prefix = g_strdup(tftp_path);
slirp->bootp_filename = g_strdup(bootfile);
slirp->vdhcp_startaddr = vdhcp_start;
+ slirp->vnext_server = vnext_server;
slirp->vnameserver_addr = vnameserver;
if (vdnssearch) {
diff --git a/slirp/slirp.h b/slirp/slirp.h
index fe0e65d..a28a8d1 100644
--- a/slirp/slirp.h
+++ b/slirp/slirp.h
@@ -209,6 +209,7 @@ struct Slirp {
struct in_addr vnetwork_mask;
struct in_addr vhost_addr;
struct in_addr vdhcp_startaddr;
+ struct in_addr vnext_server;
struct in_addr vnameserver_addr;
struct in_addr client_ipaddr;
--
1.8.3.1
