Re: [libvirt] [PATCH] nwfilter: fix IP address learning

In a previous commit: commit d4bf8f415074759baf051644559e04fe78888f8b Author: Daniel P. Berrangé <berrange(a)redhat.com&gt; Date: Wed Feb 14 09:43:59 2018 +0000 nwfilter: handle missing switch enum cases Ensure all enum cases are listed in switch statements, or cast away enum type in places where we don't wish to cover all cases. Reviewed-by: John Ferlan <jferlan(a)redhat.com&gt; Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com&gt; we changed a switch in the nwfilter learning thread so that it had explict cases for all enum entries. Unfortunately the parameters in the method had been declared with incorrect type. The "howDetect" parameter does *not* accept "enum howDetect" values, rather it accepts a bitmask of "enum howDetect" values, so it should have been an "int" type. The caller always passes DETECT_STATIC|DETECT_DHCP, so essentially the IP addressing learning was completely broken by the above change, as it never matched any switch case, hitting the default leading to EINVAL. Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com&gt; --- src/nwfilter/nwfilter_learnipaddr.c | 13 ++++++------- src/nwfilter/nwfilter_learnipaddr.h | 2 +- 2 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/src/nwfilter/nwfilter_learnipaddr.c b/src/nwfilter/nwfilter_learnipaddr.c index cc3bfd971c..061b39d72b 100644 --- a/src/nwfilter/nwfilter_learnipaddr.c +++ b/src/nwfilter/nwfilter_learnipaddr.c @@ -144,7 +144,7 @@ struct _virNWFilterIPAddrLearnReq { char *filtername; virHashTablePtr filterparams; virNWFilterDriverStatePtr driver; - enum howDetect howDetect; + int howDetect; /* bitmask of enum howDetect */ int status; volatile bool terminate; @@ -442,23 +442,22 @@ learnIPAddressThread(void *arg) if (techdriver->applyDHCPOnlyRules(req->ifname, &req->macaddr, NULL, false) < 0) { + VIR_DEBUG("Unable to apply DHCP only rules"); req->status = EINVAL; goto done; } virBufferAddLit(&buf, "src port 67 and dst port 68"); break; - case DETECT_STATIC: + default: if (techdriver->applyBasicRules(req->ifname, &req->macaddr) < 0) { + VIR_DEBUG("Unable to apply basic rules"); req->status = EINVAL; goto done; } virBufferAsprintf(&buf, "ether host %s or ether dst ff:ff:ff:ff:ff:ff", macaddr); break; - default: - req->status = EINVAL; - goto done; } if (virBufferError(&buf)) { @@ -693,7 +692,7 @@ learnIPAddressThread(void *arg) * once its IP address has been detected * @driver : the network filter driver * @howDetect : the method on how the thread is supposed to detect the - * IP address; must choose any of the available flags + * IP address; bitmask of "enum howDetect" flags. * * Instruct to learn the IP address being used on a given interface (ifname). * Unless there already is a thread attempting to learn the IP address @@ -711,7 +710,7 @@ virNWFilterLearnIPAddress(virNWFilterTechDriverPtr techdriver, const char *filtername, virHashTablePtr filterparams, virNWFilterDriverStatePtr driver, - enum howDetect howDetect) + int howDetect) { int rc; virThread thread; diff --git a/src/nwfilter/nwfilter_learnipaddr.h b/src/nwfilter/nwfilter_learnipaddr.h index 06fea5bff8..753aabc594 100644 --- a/src/nwfilter/nwfilter_learnipaddr.h +++ b/src/nwfilter/nwfilter_learnipaddr.h @@ -43,7 +43,7 @@ int virNWFilterLearnIPAddress(virNWFilterTechDriverPtr techdriver, const char *filtername, virHashTablePtr filterparams, virNWFilterDriverStatePtr driver, - enum howDetect howDetect); + int howDetect); bool virNWFilterHasLearnReq(int ifindex); int virNWFilterTerminateLearnReq(const char *ifname);