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Clean all tables before applying 'basic' rules

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The functions invoked by the IP address learning thread
that apply some basic filtering rules did not clean up
any previous filtering rules that may still be there
(due to a libvirt restart for example). With the
patch below all the rules are cleaned up first.

Also, I am introducing a function to drop all traffic
in case the IP address learning thread could not apply
the rules.
This commit is contained in:
Stefan Berger 2010-04-30 08:06:18 -04:00
parent b9efc7dc3b
commit 59fe163f2f
4 changed files with 96 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
src/conf/nwfilter_conf.h
View File

@ -521,6 +521,8 @@ typedef int (*virNWFilterApplyDHCPOnlyRules)(const char *ifname,
typedef int (*virNWFilterRemoveBasicRules)(const char *ifname);
typedef int (*virNWFilterDropAllRules)(const char *ifname);
enum techDrvFlags {
TECHDRV_FLAG_INITIALIZED = (1 << 0),
};
@ -544,6 +546,7 @@ struct _virNWFilterTechDriver {
virNWFilterCanApplyBasicRules canApplyBasicRules;
virNWFilterApplyBasicRules applyBasicRules;
virNWFilterApplyDHCPOnlyRules applyDHCPOnlyRules;
virNWFilterDropAllRules applyDropAllRules;
virNWFilterRemoveBasicRules removeBasicRules;
};

104
src/nwfilter/nwfilter_ebiptables_driver.c
View File

@ -102,6 +102,7 @@ static const char *m_physdev_out_str = "-m physdev " PHYSDEV_OUT;
static int ebtablesRemoveBasicRules(const char *ifname);
static int ebiptablesDriverInit(void);
static void ebiptablesDriverShutdown(void);
static int ebtablesCleanAll(const char *ifname);
struct ushort_map {
@ -2679,12 +2680,7 @@ ebtablesApplyBasicRules(const char *ifname,
virFormatMacAddr(macaddr, macaddr_str);
ebtablesUnlinkTmpRootChain(&buf, 1, ifname);
ebtablesUnlinkTmpRootChain(&buf, 0, ifname);
ebtablesRemoveTmpSubChains(&buf, ifname);
ebtablesRemoveTmpRootChain(&buf, 1, ifname);
ebtablesRemoveTmpRootChain(&buf, 0, ifname);
ebiptablesExecCLI(&buf, &cli_status);
ebtablesCleanAll(ifname);
ebtablesCreateTmpRootChain(&buf, 1, ifname, 1);
@ -2723,6 +2719,7 @@ ebtablesApplyBasicRules(const char *ifname,
CMD_STOPONERR(1));
ebtablesLinkTmpRootChain(&buf, 1, ifname, 1);
ebtablesRenameTmpRootChain(&buf, 1, ifname);
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
goto tear_down_tmpebchains;
@ -2730,7 +2727,7 @@ ebtablesApplyBasicRules(const char *ifname,
return 0;
tear_down_tmpebchains:
ebtablesRemoveBasicRules(ifname);
ebtablesCleanAll(ifname);
virNWFilterReportError(VIR_ERR_BUILD_FIREWALL,
"%s",
@ -2782,12 +2779,7 @@ ebtablesApplyDHCPOnlyRules(const char *ifname,
virFormatMacAddr(macaddr, macaddr_str);
ebtablesUnlinkTmpRootChain(&buf, 1, ifname);
ebtablesUnlinkTmpRootChain(&buf, 0, ifname);
ebtablesRemoveTmpSubChains(&buf, ifname);
ebtablesRemoveTmpRootChain(&buf, 1, ifname);
ebtablesRemoveTmpRootChain(&buf, 0, ifname);
ebiptablesExecCLI(&buf, &cli_status);
ebtablesCleanAll(ifname);
ebtablesCreateTmpRootChain(&buf, 1, ifname, 1);
ebtablesCreateTmpRootChain(&buf, 0, ifname, 1);
@ -2842,6 +2834,8 @@ ebtablesApplyDHCPOnlyRules(const char *ifname,
ebtablesLinkTmpRootChain(&buf, 1, ifname, 1);
ebtablesLinkTmpRootChain(&buf, 0, ifname, 1);
ebtablesRenameTmpRootChain(&buf, 1, ifname);
ebtablesRenameTmpRootChain(&buf, 0, ifname);
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
goto tear_down_tmpebchains;
@ -2851,7 +2845,7 @@ ebtablesApplyDHCPOnlyRules(const char *ifname,
return 0;
tear_down_tmpebchains:
ebtablesRemoveBasicRules(ifname);
ebtablesCleanAll(ifname);
virNWFilterReportError(VIR_ERR_BUILD_FIREWALL,
"%s",
@ -2863,8 +2857,83 @@ tear_down_tmpebchains:
}
/**
* ebtablesApplyDropAllRules
*
* @ifname: name of the backend-interface to which to apply the rules
*
* Returns 0 on success, 1 on failure with the rules removed
*
* Apply filtering rules so that the VM cannot receive or send traffic.
*/
static int
ebtablesApplyDropAllRules(const char *ifname)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
int cli_status;
char chain_in [MAX_CHAINNAME_LENGTH],
chain_out[MAX_CHAINNAME_LENGTH];
if (!ebtables_cmd_path) {
virNWFilterReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("cannot create rules since ebtables tool is "
"missing."));
return 1;
}
ebtablesCleanAll(ifname);
ebtablesCreateTmpRootChain(&buf, 1, ifname, 1);
ebtablesCreateTmpRootChain(&buf, 0, ifname, 1);
PRINT_ROOT_CHAIN(chain_in , CHAINPREFIX_HOST_IN_TEMP , ifname);
PRINT_ROOT_CHAIN(chain_out, CHAINPREFIX_HOST_OUT_TEMP, ifname);
virBufferVSprintf(&buf,
CMD_DEF("%s -t %s -A %s -j DROP") CMD_SEPARATOR
CMD_EXEC
"%s",
ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain_in,
CMD_STOPONERR(1));
virBufferVSprintf(&buf,
CMD_DEF("%s -t %s -A %s -j DROP") CMD_SEPARATOR
CMD_EXEC
"%s",
ebtables_cmd_path, EBTABLES_DEFAULT_TABLE, chain_out,
CMD_STOPONERR(1));
ebtablesLinkTmpRootChain(&buf, 1, ifname, 1);
ebtablesLinkTmpRootChain(&buf, 0, ifname, 1);
ebtablesRenameTmpRootChain(&buf, 1, ifname);
ebtablesRenameTmpRootChain(&buf, 0, ifname);
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
goto tear_down_tmpebchains;
return 0;
tear_down_tmpebchains:
ebtablesCleanAll(ifname);
virNWFilterReportError(VIR_ERR_BUILD_FIREWALL,
"%s",
_("Some rules could not be created."));
return 1;
}
static int
ebtablesRemoveBasicRules(const char *ifname)
{
return ebtablesCleanAll(ifname);
}
static int ebtablesCleanAll(const char *ifname)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
int cli_status;
@ -2872,6 +2941,12 @@ ebtablesRemoveBasicRules(const char *ifname)
if (!ebtables_cmd_path)
return 0;
ebtablesUnlinkRootChain(&buf, 1, ifname);
ebtablesUnlinkRootChain(&buf, 0, ifname);
ebtablesRemoveSubChains(&buf, ifname);
ebtablesRemoveRootChain(&buf, 1, ifname);
ebtablesRemoveRootChain(&buf, 0, ifname);
ebtablesUnlinkTmpRootChain(&buf, 1, ifname);
ebtablesUnlinkTmpRootChain(&buf, 0, ifname);
ebtablesRemoveTmpSubChains(&buf, ifname);
@ -3265,6 +3340,7 @@ virNWFilterTechDriver ebiptables_driver = {
.canApplyBasicRules = ebiptablesCanApplyBasicRules,
.applyBasicRules = ebtablesApplyBasicRules,
.applyDHCPOnlyRules = ebtablesApplyDHCPOnlyRules,
.applyDropAllRules = ebtablesApplyDropAllRules,
.removeBasicRules = ebtablesRemoveBasicRules,
};

4
src/nwfilter/nwfilter_learnipaddr.c
View File

@ -598,8 +598,6 @@ learnIPAddressThread(void *arg)
if (handle)
pcap_close(handle);
techdriver->removeBasicRules(req->ifname);
if (req->status == 0) {
int ret;
char inetaddr[INET_ADDRSTRLEN];
@ -624,6 +622,8 @@ learnIPAddressThread(void *arg)
_("encountered an error on interface %s "
"index %d"),
req->ifname, req->ifindex);
techdriver->applyDropAllRules(req->ifname);
}
memset(&req->thread, 0x0, sizeof(req->thread));

2
src/nwfilter/nwfilter_learnipaddr.h
View File

@ -60,7 +60,7 @@ int virNWFilterLearnIPAddress(virNWFilterTechDriverPtr techdriver,
enum howDetect howDetect);
virNWFilterIPAddrLearnReqPtr virNWFilterLookupLearnReq(int ifindex);
int virNWFilterTerminateLearnReq(const char *ifname);
void virNWFilterDelIpAddrForIfname(const char *ifname);
const char *virNWFilterGetIpAddrForIfname(const char *ifname);