[libvirt] [PATCH 1/2] util: Functions to update host network device's multicast filter
akrowiak at linux.vnet.ibm.com
akrowiak at linux.vnet.ibm.com
Mon Oct 6 21:37:20 UTC 2014
From: Tony Krowiak <akrowiak at linux.vnet.ibm.com>
This patch provides the utility functions to needed to synchronize the
changes made to a guest domain network device's multicast filter
with the corresponding macvtap device's filter on the host:
* Get/add/remove multicast MAC addresses
* Get the macvtap device's RX filter list
Signed-off-by: Tony Krowiak <akrowiak at linux.vnet.ibm.com>
---
src/libvirt_private.syms | 4 +
src/util/virmacaddr.c | 37 +++++
src/util/virmacaddr.h | 4 +
src/util/virnetdev.c | 360 ++++++++++++++++++++++++++++++++++++++++++++++
src/util/virnetdev.h | 11 ++
5 files changed, 416 insertions(+), 0 deletions(-)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index d6265ac..6d06a2c 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1590,13 +1590,16 @@ virMacAddrIsBroadcastRaw;
virMacAddrIsMulticast;
virMacAddrIsUnicast;
virMacAddrParse;
+virMacAddrParseHex;
virMacAddrSet;
virMacAddrSetRaw;
# util/virnetdev.h
+virNetDevAddMulti;
virNetDevAddRoute;
virNetDevClearIPv4Address;
+virNetDevDelMulti;
virNetDevExists;
virNetDevGetIndex;
virNetDevGetIPv4Address;
@@ -1604,6 +1607,7 @@ virNetDevGetLinkInfo;
virNetDevGetMAC;
virNetDevGetMTU;
virNetDevGetPhysicalFunction;
+virNetDevGetRxFilter;
virNetDevGetVirtualFunctionIndex;
virNetDevGetVirtualFunctionInfo;
virNetDevGetVirtualFunctions;
diff --git a/src/util/virmacaddr.c b/src/util/virmacaddr.c
index ebd1182..ae5e5d2 100644
--- a/src/util/virmacaddr.c
+++ b/src/util/virmacaddr.c
@@ -198,6 +198,43 @@ virMacAddrFormat(const virMacAddr *addr,
return str;
}
+/**
+ * virMacAddrParseHex:
+ * @str: string hexadecimal representation of MAC address, e.g., "F801EFCE3aCB"
+ * @addr: 6-byte MAC address
+ *
+ * Parse the hexadecimal representation of a MAC address
+ *
+ * Return 0 upon success, or -1 in case of error.
+ */
+int
+virMacAddrParseHex(const char* str, virMacAddrPtr addr)
+{
+ if (strlen(str) != VIR_MAC_HEXLEN)
+ return -1;
+
+ size_t iaddr;
+ size_t istr;
+
+
+ for (istr = 0, iaddr = 0; iaddr < VIR_MAC_BUFLEN; istr += 2, iaddr++) {
+ unsigned int hex;
+
+ if (sscanf(&str[istr], "%02x", &hex) != 1)
+ break;
+
+ if (hex > UCHAR_MAX)
+ break;
+
+ addr->addr[iaddr] = hex;
+ }
+
+ if (istr == VIR_MAC_HEXLEN)
+ return 0;
+
+ return -1;
+}
+
void virMacAddrGenerate(const unsigned char prefix[VIR_MAC_PREFIX_BUFLEN],
virMacAddrPtr addr)
{
diff --git a/src/util/virmacaddr.h b/src/util/virmacaddr.h
index 49efc36..72a285a 100644
--- a/src/util/virmacaddr.h
+++ b/src/util/virmacaddr.h
@@ -27,6 +27,7 @@
# include "internal.h"
# define VIR_MAC_BUFLEN 6
+#define VIR_MAC_HEXLEN (VIR_MAC_BUFLEN * 2)
# define VIR_MAC_PREFIX_BUFLEN 3
# define VIR_MAC_STRING_BUFLEN (VIR_MAC_BUFLEN * 3)
@@ -50,6 +51,9 @@ void virMacAddrGenerate(const unsigned char prefix[VIR_MAC_PREFIX_BUFLEN],
virMacAddrPtr addr);
int virMacAddrParse(const char* str,
virMacAddrPtr addr) ATTRIBUTE_RETURN_CHECK;
+int virMacAddrParseHex(const char* str,
+ virMacAddrPtr addr)
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
bool virMacAddrIsUnicast(const virMacAddr *addr);
bool virMacAddrIsMulticast(const virMacAddr *addr);
bool virMacAddrIsBroadcastRaw(const unsigned char s[VIR_MAC_BUFLEN]);
diff --git a/src/util/virnetdev.c b/src/util/virnetdev.c
index db5623a..5e53f5f 100644
--- a/src/util/virnetdev.c
+++ b/src/util/virnetdev.c
@@ -56,6 +56,33 @@
VIR_LOG_INIT("util.netdev");
+# define VIR_MCAST_NAME_LEN (IFNAMSIZ + 1)
+# define VIR_MCAST_INDEX_TOKEN_IDX 0
+# define VIR_MCAST_NAME_TOKEN_IDX 1
+# define VIR_MCAST_USERS_TOKEN_IDX 2
+# define VIR_MCAST_GLOBAL_TOKEN_IDX 3
+# define VIR_MCAST_ADDR_TOKEN_IDX 4
+# define VIR_MCAST_NUM_TOKENS 5
+# define VIR_MCAST_TOKEN_DELIMS " \n"
+# define VIR_MCAST_ADDR_LEN (VIR_MAC_HEXLEN + 1)
+
+typedef struct _virNetDevMcastEntry virNetDevMcastEntry;
+typedef virNetDevMcastEntry *virNetDevMcastEntryPtr;
+struct _virNetDevMcastEntry {
+ int index;
+ char name[VIR_MCAST_NAME_LEN];
+ int users;
+ bool global;
+ virMacAddr macaddr;
+};
+
+typedef struct _virNetDevMcast virNetDevMcast;
+typedef virNetDevMcast *virNetDevMcastPtr;
+struct _virNetDevMcast {
+ size_t nentries;
+ virNetDevMcastEntryPtr *entries;
+};
+
#if defined(HAVE_STRUCT_IFREQ)
static int virNetDevSetupControlFull(const char *ifname,
struct ifreq *ifr,
@@ -1934,6 +1961,266 @@ virNetDevGetLinkInfo(const char *ifname,
#endif /* defined(__linux__) */
+#if defined(SIOCADDMULTI) && defined(HAVE_STRUCT_IFREQ)
+/**
+ * virNetDevAddMulti:
+ * @ifname: interface name to which to add multicast MAC address
+ * @macaddr: MAC address
+ *
+ * This function adds the @macaddr to the multicast list for a given interface
+ * @ifname.
+ *
+ * Returns 0 in case of success or -1 on failure
+ */
+int virNetDevAddMulti(const char *ifname,
+ virMacAddrPtr macaddr)
+{
+ int fd = -1;
+ int ret = -1;
+ struct ifreq ifr;
+
+ if ((fd = virNetDevSetupControl(ifname, &ifr)) < 0)
+ return -1;
+
+ ifr.ifr_hwaddr.sa_family = AF_UNSPEC;
+ virMacAddrGetRaw(macaddr, (unsigned char *)ifr.ifr_hwaddr.sa_data);
+
+ if (ioctl(fd, SIOCADDMULTI, &ifr) < 0) {
+ char macstr[VIR_MAC_STRING_BUFLEN];
+ virReportSystemError(errno,
+ _("Cannot add multicast MAC %s on '%s' interface"),
+ virMacAddrFormat(macaddr, macstr), ifname);
+ goto cleanup;
+ }
+
+ ret = 0;
+
+ cleanup:
+ VIR_FORCE_CLOSE(fd);
+ return ret;
+}
+#else
+int virNetDevAddMulti(const char *ifname,
+ virMacAddrPtr macaddr ATTRIBUTE_UNUSED)
+{
+ char macstr[VIR_MAC_STRING_BUFLEN];
+ virReportSystemError(errno,
+ _("Cannot add multicast MAC %s on '%s' interface"),
+ virMacAddrFormat(macaddr, macstr), ifname);
+ return -1;
+}
+#endif
+
+#if defined(SIOCDELMULTI) && defined(HAVE_STRUCT_IFREQ)
+/**
+ * virNetDevDelMulti:
+ * @ifname: interface name from which to delete the multicast MAC address
+ * @macaddr: MAC address
+ *
+ * This function deletes the @macaddr from the multicast list for a given
+ * interface @ifname.
+ *
+ * Returns 0 in case of success or -1 on failure
+ */
+int virNetDevDelMulti(const char *ifname,
+ virMacAddrPtr macaddr)
+{
+ int fd = -1;
+ int ret = -1;
+ struct ifreq ifr;
+
+ if ((fd = virNetDevSetupControl(ifname, &ifr)) < 0)
+ return -1;
+
+ ifr.ifr_hwaddr.sa_family = AF_UNSPEC;
+ virMacAddrGetRaw(macaddr, (unsigned char *)ifr.ifr_hwaddr.sa_data);
+
+ if (ioctl(fd, SIOCDELMULTI, &ifr) < 0) {
+ char macstr[VIR_MAC_STRING_BUFLEN];
+ virReportSystemError(errno,
+ _("Cannot add multicast MAC %s on '%s' interface"),
+ virMacAddrFormat(macaddr, macstr), ifname);
+ goto cleanup;
+ }
+
+ ret = 0;
+
+ cleanup:
+ VIR_FORCE_CLOSE(fd);
+ return ret;
+}
+#else
+int virNetDevDelMulti(const char *ifname,
+ virMacAddrPtr macaddr ATTRIBUTE_UNUSED)
+{
+ char macstr[VIR_MAC_STRING_BUFLEN];
+ virReportSystemError(errno,
+ _("Cannot delete multicast MAC %s on '%s' interface"),
+ virMacAddrFormat(macaddr, macstr), ifname);
+ return -1;
+}
+#endif
+
+static int virNetDevParseMcast(char *buf, virNetDevMcastEntryPtr mcast)
+{
+ int ifindex;
+ int num;
+ char *next;
+ char *token;
+ char *saveptr;
+ char *endptr;
+
+ for (ifindex = 0, next = buf; ifindex < VIR_MCAST_NUM_TOKENS; ifindex++,
+ next = NULL) {
+ token = strtok_r(next, VIR_MCAST_TOKEN_DELIMS, &saveptr);
+
+ if (token == NULL) {
+ virReportSystemError(EINVAL,
+ _("failed to parse multicast address from '%s'"),
+ buf);
+ return -1;
+ }
+
+ switch (ifindex) {
+ case VIR_MCAST_INDEX_TOKEN_IDX:
+ if (virStrToLong_i(token, &endptr, 10, &num) < 0) {
+ virReportSystemError(EINVAL,
+ _("Failed to parse index from '%s'"),
+ buf);
+ return -1;
+
+ }
+
+ mcast->index = num;
+
+ break;
+ case VIR_MCAST_NAME_TOKEN_IDX:
+ if (virStrncpy(mcast->name, token, strlen(token),
+ VIR_MCAST_NAME_LEN) == NULL) {
+ virReportSystemError(EINVAL,
+ _("Failed to parse NIC name from '%s'"),
+ buf);
+ return -1;
+ }
+
+ break;
+ case VIR_MCAST_USERS_TOKEN_IDX:
+ if (virStrToLong_i(token, &endptr, 10, &num) < 0) {
+ virReportSystemError(EINVAL,
+ _("Failed to parse users from '%s'"),
+ buf);
+ return -1;
+
+ }
+
+ mcast->users = num;
+
+ break;
+ case VIR_MCAST_GLOBAL_TOKEN_IDX:
+ if (virStrToLong_i(token, &endptr, 10, &num) < 0) {
+ virReportSystemError(EINVAL,
+ _("Failed to parse users from '%s'"),
+ buf);
+ return -1;
+
+ }
+
+ mcast->global = num;
+
+ break;
+ case VIR_MCAST_ADDR_TOKEN_IDX:
+ if (virMacAddrParseHex((const char*)token,
+ &mcast->macaddr) < 0) {
+ virReportSystemError(EINVAL,
+ _("Failed to parse MAC address from '%s'"),
+ buf);
+ }
+
+ break;
+ default:
+ break;
+ }
+ }
+
+ return 0;
+}
+
+
+static int virNetDevGetMcast(const char *ifname,
+ virNetDevMcastPtr mcast)
+{
+ FILE *file;
+ const char *path = "/proc/net/dev_mcast";
+ char buf[256];
+ int ret = -1;
+ virNetDevMcastEntry entry;
+ virNetDevMcastEntryPtr *entries = NULL;
+ size_t nentries = 0;
+ size_t entries_sz = 0;
+ size_t i;
+ mcast->entries = NULL;
+ mcast->nentries = 0;
+
+ file = fopen(path, "r");
+
+ if (!file) {
+ virReportSystemError(errno,
+ _("cannot open multicast address file %s"), path);
+ return -1;
+ }
+
+ while (fgets(buf, sizeof(buf), file)) {
+ if (virNetDevParseMcast(buf, &entry) < 0) {
+ goto error;
+ }
+
+ if (entry.global && STREQ(ifname, entry.name)) {
+ if (VIR_RESIZE_N(entries, entries_sz,
+ nentries, 1) < 0) {
+ virReportSystemError(ENOMEM,
+ _("Failed to resize multicast MAC address array: "
+ "ptr=%p, alloc=%zu, count=%zu, add=1"),
+ entries, entries_sz, nentries);
+ goto error;
+ }
+
+ if (VIR_ALLOC(entries[nentries]) < 0) {
+ char addr[VIR_MAC_STRING_BUFLEN];
+ virReportSystemError(ENOMEM,
+ _("Failed to allocate storage for MAC address %s"),
+ virMacAddrFormat(&mcast->entries[nentries]->macaddr,
+ addr));
+ goto error;
+ }
+
+ memcpy(entries[nentries++], &entry,
+ sizeof(virNetDevMcastEntry));
+ }
+
+ memset(buf, 0, sizeof(buf));
+ memset(&entry, 0, sizeof(virNetDevMcastEntry));
+ }
+
+
+ mcast->nentries = nentries;
+ mcast->entries = entries;
+ ret = 0;
+
+ error:
+ VIR_FORCE_FCLOSE(file);
+
+ if ((ret < 0) && (nentries > 0)) {
+ for (i = 0; i < nentries; i++) {
+ VIR_FREE(entries[i]);
+ }
+
+ VIR_FREE(entries);
+ }
+
+ return ret;
+}
+
+
VIR_ENUM_IMPL(virNetDevRxFilterMode,
VIR_NETDEV_RX_FILTER_MODE_LAST,
"none",
@@ -1941,6 +2228,37 @@ VIR_ENUM_IMPL(virNetDevRxFilterMode,
"all");
+static int virNetDevGetMulticastTable(const char *ifname,
+ virNetDevRxFilterPtr filter)
+{
+ int i;
+ int ret = -1;
+ virNetDevMcast mcast;
+ filter->multicast.nTable = 0;
+ filter->multicast.table = NULL;
+
+ if (virNetDevGetMcast(ifname, &mcast) < 0)
+ goto error;
+
+ if (mcast.nentries > 0) {
+ if (VIR_ALLOC_N(filter->multicast.table, mcast.nentries))
+ goto error;
+
+ for (i = 0; i < mcast.nentries; i++) {
+ virMacAddrSet(&filter->multicast.table[i],
+ &mcast.entries[i]->macaddr);
+ }
+
+ filter->multicast.nTable = mcast.nentries;
+ }
+
+ ret = 0;
+
+ error:
+ return ret;
+}
+
+
virNetDevRxFilterPtr
virNetDevRxFilterNew(void)
{
@@ -1963,3 +2281,45 @@ virNetDevRxFilterFree(virNetDevRxFilterPtr filter)
VIR_FREE(filter);
}
}
+
+
+/**
+ * virNetDevGetRxFilter:
+ * This function supplies the RX filter list for a given device interface
+ *
+ * @ifname: Name of the interface
+ * @filter: The RX filter list
+ *
+ * Returns 0 or -1 on failure.
+ */
+int virNetDevGetRxFilter(const char *ifname,
+ virNetDevRxFilterPtr *filter)
+{
+ int ret = -1;
+ virNetDevRxFilterPtr fil = virNetDevRxFilterNew();
+
+ if (!fil) {
+ virReportSystemError(ENOMEM,
+ _("Failed to allocate filter for %s interface"),
+ ifname);
+
+ }
+
+ if (virNetDevGetMAC(ifname, &fil->mac))
+ goto cleanup;
+
+ if (virNetDevGetMulticastTable(ifname, fil))
+ goto cleanup;
+
+ ret = 0;
+
+ cleanup:
+ if (ret < 0) {
+ virNetDevRxFilterFree(fil);
+ fil = NULL;
+ }
+
+ *filter = fil;
+
+ return ret;
+}
diff --git a/src/util/virnetdev.h b/src/util/virnetdev.h
index 2a6e67d..1d274b3 100644
--- a/src/util/virnetdev.h
+++ b/src/util/virnetdev.h
@@ -30,6 +30,7 @@
# include "virmacaddr.h"
# include "virpci.h"
# include "device_conf.h"
+# include "virutil.h"
# ifdef HAVE_STRUCT_IFREQ
typedef struct ifreq virIfreq;
@@ -189,5 +190,15 @@ int virNetDevGetLinkInfo(const char *ifname,
virNetDevRxFilterPtr virNetDevRxFilterNew(void)
ATTRIBUTE_RETURN_CHECK;
void virNetDevRxFilterFree(virNetDevRxFilterPtr filter);
+int virNetDevGetRxFilter(const char *ifname,
+ virNetDevRxFilterPtr *filter)
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
+
+int virNetDevAddMulti(const char *ifname,
+ virMacAddrPtr macaddr)
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
+int virNetDevDelMulti(const char *ifname,
+ virMacAddrPtr macaddr)
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
#endif /* __VIR_NETDEV_H__ */
--
1.7.1
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