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qapi-schema, qemu-options & slirp: Adding Qemu options for IPv6 addresses

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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 <meow@meowstars.org>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Yann Bordenave 2016-03-15 10:31:22 +01:00 committed by Samuel Thibault
parent 05061d8548
commit 7aac531ef2
6 changed files with 148 additions and 30 deletions
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31
net/net.c
View File

@ -1050,6 +1050,37 @@ int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
OptsVisitor *ov = opts_visitor_new(opts);
Visitor *v = opts_get_visitor(ov);
{
/* 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. */
unsigned long len;
int err;
qemu_opt_set(opts, "ip6-prefix", buf, &error_abort);
err = qemu_strtoul(ip6_net, NULL, 10, &len);
if (err) {
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");
}
}
if (is_netdev) {
visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
} else {

81
net/slirp.c
View File

@ -36,6 +36,7 @@
#include "qemu/error-report.h"
#include "qemu/sockets.h"
#include "slirp/libslirp.h"
#include "slirp/ip6.h"
#include "sysemu/char.h"
static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
@ -135,10 +136,13 @@ 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 */
@ -146,6 +150,9 @@ 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 in6_addr ip6_prefix;
struct in6_addr ip6_host;
struct in6_addr ip6_dns;
#ifndef _WIN32
struct in_addr smbsrv = { .s_addr = 0 };
#endif
@ -235,6 +242,64 @@ static int net_slirp_init(NetClientState *peer, const char *model,
}
#endif
#if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
/* No inet_pton helper before Vista... */
if (vprefix6) {
/* Unsupported */
return -1;
}
memset(&ip6_prefix, 0, sizeof(ip6_prefix));
ip6_prefix.s6_addr[0] = 0xfe;
ip6_prefix.s6_addr[1] = 0xc0;
#else
if (!vprefix6) {
vprefix6 = "fec0::";
}
if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
return -1;
}
#endif
if (!vprefix6_len) {
vprefix6_len = 64;
}
if (vprefix6_len < 0 || vprefix6_len > 126) {
return -1;
}
if (vhost6) {
#if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
return -1;
#else
if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
return -1;
}
if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) {
return -1;
}
#endif
} else {
ip6_host = ip6_prefix;
ip6_host.s6_addr[15] |= 2;
}
if (vnameserver6) {
#if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
return -1;
#else
if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
return -1;
}
if (!in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) {
return -1;
}
#endif
} else {
ip6_dns = ip6_prefix;
ip6_dns.s6_addr[15] |= 3;
}
nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
snprintf(nc->info_str, sizeof(nc->info_str),
@ -243,8 +308,10 @@ 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 +828,10 @@ 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) {

12
qapi-schema.json
View File

@ -2451,6 +2451,14 @@
# @dnssearch: #optional list of DNS suffixes to search, passed as DHCP option
# to the guest
#
# @ip6-prefix: #optional IPv6 network prefix (default is fec0::) (since 2.6)
#
# @ip6-prefixlen: #optional IPv6 network prefix length (default is 64) (since 2.6)
#
# @ip6-host: #optional guest-visible IPv6 address of the host (since 2.6)
#
# @ip6-dns: #optional guest-visible IPv6 address of the virtual nameserver (since 2.6)
#
# @smb: #optional root directory of the built-in SMB server
#
# @smbserver: #optional IP address of the built-in SMB server
@ -2474,6 +2482,10 @@
'*dhcpstart': 'str',
'*dns': 'str',
'*dnssearch': ['String'],
'*ip6-prefix': 'str',
'*ip6-prefixlen': 'int',
'*ip6-host': 'str',
'*ip6-dns': 'str',
'*smb': 'str',
'*smbserver': 'str',
'*hostfwd': ['String'],

18
qemu-options.hx
View File

@ -1560,8 +1560,9 @@ 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"
@ -1718,6 +1719,14 @@ 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.
@item ip6-net=@var{addr}[/@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.
@item ip6-host=@var{addr}
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
@ -1735,6 +1744,11 @@ 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.
@item ip6-dns=@var{addr}
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 dnssearch=@var{domain}
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

8
slirp/libslirp.h
View File

@ -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);

28
slirp/slirp.c
View File

@ -201,9 +201,11 @@ 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));
@ -223,22 +225,9 @@ Slirp *slirp_init(int restricted, struct in_addr vnetwork,
slirp->vnetwork_addr = vnetwork;
slirp->vnetwork_mask = vnetmask;
slirp->vhost_addr = vhost;
#if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
/* No inet_pton helper... */
memset(&slirp->vprefix_addr6, 0, sizeof(slirp->vprefix_addr6));
slirp->vprefix_addr6.s6_addr[0] = 0xfe;
slirp->vprefix_addr6.s6_addr[1] = 0xc0;
slirp->vprefix_len = 64;
slirp->vhost_addr6 = slirp->vprefix_addr6;
slirp->vhost_addr6.s6_addr[15] = 0x2;
slirp->vnameserver_addr6 = slirp->vprefix_addr6;
slirp->vnameserver_addr6.s6_addr[15] = 0x3;
#else
inet_pton(AF_INET6, "fec0::0", &slirp->vprefix_addr6);
slirp->vprefix_len = 64;
inet_pton(AF_INET6, "fec0::2", &slirp->vhost_addr6);
inet_pton(AF_INET6, "fec0::3", &slirp->vnameserver_addr6);
#endif
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);
@ -247,6 +236,7 @@ Slirp *slirp_init(int restricted, struct in_addr vnetwork,
slirp->bootp_filename = g_strdup(bootfile);
slirp->vdhcp_startaddr = vdhcp_start;
slirp->vnameserver_addr = vnameserver;
slirp->vnameserver_addr6 = vnameserver6;
if (vdnssearch) {
translate_dnssearch(slirp, vdnssearch);