[libvirt PATCH 02/12] util: rename/move iptablesFormatNetwork to virSocketAddrFormatWithPrefix
Laine Stump
laine at redhat.com
Sun Dec 12 19:48:20 UTC 2021
This function formats an address + prefix as, e.g. 192.168.122.0/24,
which is useful in places other than iptables. Move it to
virsocketaddr.c and make it public so that others can use it. While
moving, the bit that masks off the host bits of the address is made
optional, so that the function is more generally useful.
Signed-off-by: Laine Stump <laine at redhat.com>
---
src/libvirt_private.syms | 1 +
src/util/viriptables.c | 41 +++++--------------------------------
src/util/virsocketaddr.c | 44 ++++++++++++++++++++++++++++++++++++++++
src/util/virsocketaddr.h | 3 +++
4 files changed, 53 insertions(+), 36 deletions(-)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index ff6f71054e..72b38a970d 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -3269,6 +3269,7 @@ virSocketAddrCheckNetmask;
virSocketAddrEqual;
virSocketAddrFormat;
virSocketAddrFormatFull;
+virSocketAddrFormatWithPrefix;
virSocketAddrGetIPPrefix;
virSocketAddrGetNumNetmaskBits;
virSocketAddrGetPath;
diff --git a/src/util/viriptables.c b/src/util/viriptables.c
index ac949efba7..78d979cfe8 100644
--- a/src/util/viriptables.c
+++ b/src/util/viriptables.c
@@ -353,37 +353,6 @@ iptablesRemoveUdpOutput(virFirewall *fw,
}
-static char *iptablesFormatNetwork(virSocketAddr *netaddr,
- unsigned int prefix)
-{
- virSocketAddr network;
- g_autofree char *netstr = NULL;
- char *ret;
-
- if (!(VIR_SOCKET_ADDR_IS_FAMILY(netaddr, AF_INET) ||
- VIR_SOCKET_ADDR_IS_FAMILY(netaddr, AF_INET6))) {
- virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
- _("Only IPv4 or IPv6 addresses can be used with iptables"));
- return NULL;
- }
-
- if (virSocketAddrMaskByPrefix(netaddr, prefix, &network) < 0) {
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
- _("Failure to mask address"));
- return NULL;
- }
-
- netstr = virSocketAddrFormat(&network);
-
- if (!netstr)
- return NULL;
-
- ret = g_strdup_printf("%s/%d", netstr, prefix);
-
- return ret;
-}
-
-
/* Allow all traffic coming from the bridge, with a valid network address
* to proceed to WAN
*/
@@ -399,7 +368,7 @@ iptablesForwardAllowOut(virFirewall *fw,
virFirewallLayer layer = VIR_SOCKET_ADDR_FAMILY(netaddr) == AF_INET ?
VIR_FIREWALL_LAYER_IPV4 : VIR_FIREWALL_LAYER_IPV6;
- if (!(networkstr = iptablesFormatNetwork(netaddr, prefix)))
+ if (!(networkstr = virSocketAddrFormatWithPrefix(netaddr, prefix, true)))
return -1;
if (physdev && physdev[0])
@@ -487,7 +456,7 @@ iptablesForwardAllowRelatedIn(virFirewall *fw,
VIR_FIREWALL_LAYER_IPV4 : VIR_FIREWALL_LAYER_IPV6;
g_autofree char *networkstr = NULL;
- if (!(networkstr = iptablesFormatNetwork(netaddr, prefix)))
+ if (!(networkstr = virSocketAddrFormatWithPrefix(netaddr, prefix, true)))
return -1;
if (physdev && physdev[0])
@@ -577,7 +546,7 @@ iptablesForwardAllowIn(virFirewall *fw,
VIR_FIREWALL_LAYER_IPV4 : VIR_FIREWALL_LAYER_IPV6;
g_autofree char *networkstr = NULL;
- if (!(networkstr = iptablesFormatNetwork(netaddr, prefix)))
+ if (!(networkstr = virSocketAddrFormatWithPrefix(netaddr, prefix, true)))
return -1;
if (physdev && physdev[0])
@@ -829,7 +798,7 @@ iptablesForwardMasquerade(virFirewall *fw,
virFirewallLayer layer = af == AF_INET ?
VIR_FIREWALL_LAYER_IPV4 : VIR_FIREWALL_LAYER_IPV6;
- if (!(networkstr = iptablesFormatNetwork(netaddr, prefix)))
+ if (!(networkstr = virSocketAddrFormatWithPrefix(netaddr, prefix, true)))
return -1;
if (VIR_SOCKET_ADDR_IS_FAMILY(&addr->start, af)) {
@@ -972,7 +941,7 @@ iptablesForwardDontMasquerade(virFirewall *fw,
virFirewallLayer layer = VIR_SOCKET_ADDR_FAMILY(netaddr) == AF_INET ?
VIR_FIREWALL_LAYER_IPV4 : VIR_FIREWALL_LAYER_IPV6;
- if (!(networkstr = iptablesFormatNetwork(netaddr, prefix)))
+ if (!(networkstr = virSocketAddrFormatWithPrefix(netaddr, prefix, true)))
return -1;
if (physdev && physdev[0])
diff --git a/src/util/virsocketaddr.c b/src/util/virsocketaddr.c
index 94cbfc6264..430e43f2eb 100644
--- a/src/util/virsocketaddr.c
+++ b/src/util/virsocketaddr.c
@@ -511,6 +511,50 @@ virSocketAddrFormatFull(const virSocketAddr *addr,
}
+/*
+ * virSocketAddrFormatWithPrefix:
+ * @addr: an initialized virSocketAddr *
+ * @prefix: an IP network prefix (0-32 if IPv4, 0-128 if IPv6)
+ * @masked: true to mask off the host bits of the address
+ *
+ * Returns a string representation of the IP network described by
+ * @netaddr/@prefix. If @masked is true, the address is masked to
+ * remove the host bits according to prefix. So, for example, sending
+ * f(1.2.3.4, 24, true) would return "1.2.3.0/24", but f(1.2.3.4, 24,
+ * false) would return "1.2.3.4/24".
+ *
+ * returns false on failure (and logs an error message)
+ */
+char *
+virSocketAddrFormatWithPrefix(virSocketAddr *addr,
+ unsigned int prefix,
+ bool masked)
+{
+ virSocketAddr network;
+ g_autofree char *netstr = NULL;
+
+ if (!(VIR_SOCKET_ADDR_IS_FAMILY(addr, AF_INET) ||
+ VIR_SOCKET_ADDR_IS_FAMILY(addr, AF_INET6))) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Only IPv4 or IPv6 addresses can be used with a prefix"));
+ return NULL;
+ }
+
+ if (masked && virSocketAddrMaskByPrefix(addr, prefix, &network) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Failure to mask address"));
+ return NULL;
+ }
+
+ netstr = virSocketAddrFormat(&network);
+
+ if (!netstr)
+ return NULL;
+
+ return g_strdup_printf("%s/%d", netstr, prefix);
+}
+
+
/*
* virSocketAddrSetPort:
* @addr: an initialized virSocketAddr *
diff --git a/src/util/virsocketaddr.h b/src/util/virsocketaddr.h
index f76e229730..ec265d6e44 100644
--- a/src/util/virsocketaddr.h
+++ b/src/util/virsocketaddr.h
@@ -88,6 +88,9 @@ char *virSocketAddrFormat(const virSocketAddr *addr);
char *virSocketAddrFormatFull(const virSocketAddr *addr,
bool withService,
const char *separator);
+char *virSocketAddrFormatWithPrefix(virSocketAddr *addr,
+ unsigned int prefix,
+ bool masked);
char *virSocketAddrGetPath(virSocketAddr *addr);
--
2.33.1
More information about the libvir-list
mailing list