Message ID | 0cd00e8e1fab9eeda1ccdc257e50fb0560354db9.1551289694.git.lorenzo.bianconi@redhat.com |
---|---|
State | Superseded |
Headers | show |
Series | [ovs-dev,v3] OVN: select a random mac_prefix if not provided | expand |
On Wed, Feb 27, 2019 at 11:43 PM Lorenzo Bianconi < lorenzo.bianconi@redhat.com> wrote: > Select a random IPAM mac_prefix if it has not been provided by the user. > With this patch the admin can avoid to configure mac_prefix in order to > avoid L2 address collisions if multiple OVN deployments share the same > broadcast domain. > Remove MAC_ADDR_PREFIX definitions/occurrences since now mac_prefix is > always provided to ovn-northd > > Tested-by: Miguel Duarte de Mora Barroso <mdbarroso@redhat.com> > Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com> > Acked-by: Numan Siddique <nusiddiq@redhat.com> > --- > Changes since v2: > - add automatic test case > > Changes since v1: > - add entry in NEWS > - do not modify the idl object in-place but update it running > nbrec_nb_global_set_options > --- > NEWS | 2 ++ > ovn/northd/ovn-northd.c | 35 ++++++++++++++++------------------- > tests/ovn.at | 13 +++++++++++++ > 3 files changed, 31 insertions(+), 19 deletions(-) > > diff --git a/NEWS b/NEWS > index c86c13a23..b3b347036 100644 > --- a/NEWS > +++ b/NEWS > @@ -17,6 +17,8 @@ Post-v2.11.0 > conntrack fragmentation support. > * New "ovs-appctl dpctl/ipf-get-status" command for userspace > datapath > conntrack fragmentation support. > + - OVN: > + * Select IPAM mac_prefix in a random manner if not provided by the > user > > v2.11.0 - 19 Feb 2019 > --------------------- > diff --git a/ovn/northd/ovn-northd.c b/ovn/northd/ovn-northd.c > index 3569ea2be..373e45573 100644 > --- a/ovn/northd/ovn-northd.c > +++ b/ovn/northd/ovn-northd.c > @@ -62,7 +62,6 @@ static const char *ovnnb_db; > static const char *ovnsb_db; > static const char *unixctl_path; > > -#define MAC_ADDR_PREFIX 0x0A0000000000ULL > #define MAC_ADDR_SPACE 0xffffff > > /* MAC address management (macam) table of "struct eth_addr"s, that holds > the > @@ -937,13 +936,8 @@ ipam_insert_mac(struct eth_addr *ea, bool check) > } > > uint64_t mac64 = eth_addr_to_uint64(*ea); > - uint64_t prefix; > + uint64_t prefix = eth_addr_to_uint64(mac_prefix); > > - if (!eth_addr_is_zero(mac_prefix)) { > - prefix = eth_addr_to_uint64(mac_prefix); > - } else { > - prefix = MAC_ADDR_PREFIX; > - } > /* If the new MAC was not assigned by this address management system > or > * check is true and the new MAC is a duplicate, do not insert it > into the > * macam hmap. */ > @@ -1056,11 +1050,7 @@ ipam_get_unused_mac(ovs_be32 ip) > for (i = 0; i < MAC_ADDR_SPACE - 1; i++) { > /* The tentative MAC's suffix will be in the interval (1, > 0xfffffe). */ > mac_addr_suffix = ((base_addr + i) % (MAC_ADDR_SPACE - 1)) + 1; > - if (!eth_addr_is_zero(mac_prefix)) { > - mac64 = eth_addr_to_uint64(mac_prefix) | mac_addr_suffix; > - } else { > - mac64 = MAC_ADDR_PREFIX | mac_addr_suffix; > - } > + mac64 = eth_addr_to_uint64(mac_prefix) | mac_addr_suffix; > eth_addr_from_uint64(mac64, &mac); > if (!ipam_is_duplicate_mac(&mac, mac64, true)) { > break; > @@ -1132,13 +1122,7 @@ dynamic_mac_changed(const char *lsp_addresses, > } > > uint64_t mac64 = eth_addr_to_uint64(update->current_addresses.ea); > - uint64_t prefix; > - > - if (!eth_addr_is_zero(mac_prefix)) { > - prefix = eth_addr_to_uint64(mac_prefix); > - } else { > - prefix = MAC_ADDR_PREFIX; > - } > + uint64_t prefix = eth_addr_to_uint64(mac_prefix); > > if ((mac64 ^ prefix) >> 24) { > return DYNAMIC; > @@ -7300,6 +7284,19 @@ ovnnb_db_run(struct northd_context *ctx, > &addr.ea[0], &addr.ea[1], &addr.ea[2])) { > mac_prefix = addr; > } > + } else { > + struct smap options; > + > + smap_clone(&options, &nb->options); > + eth_addr_random(&mac_prefix); > + memset(&mac_prefix.ea[3], 0, 3); > + > + char *addr_prefix = xasprintf(ETH_ADDR_FMT, > ETH_ADDR_ARGS(mac_prefix)); > + smap_add(&options, "mac_prefix", addr_prefix); > + nbrec_nb_global_set_options(nb, &options); > + > + smap_destroy(&options); > + free(addr_prefix); > } > > cleanup_macam(&macam); > diff --git a/tests/ovn.at b/tests/ovn.at > index ec79651bd..84c06204c 100644 > --- a/tests/ovn.at > +++ b/tests/ovn.at > @@ -5596,6 +5596,7 @@ ovn_start > > # Add a port to a switch that does not have a subnet set, then set the > # subnet which should result in an address being allocated for the port. > +ovn-nbctl --wait=hv set NB_Global . options:mac_prefix="0a:00:00:00:00:00" > ovn-nbctl ls-add sw0 > ovn-nbctl lsp-add sw0 p0 -- lsp-set-addresses p0 dynamic > ovn-nbctl --wait=sb add Logical-Switch sw0 other_config subnet= > 192.168.1.0/24 > @@ -5963,6 +5964,16 @@ AT_CHECK([ovn-nbctl get Logical-Switch-Port p83 > dynamic_addresses], [0], > ["00:11:22:00:00:08" > ]) > > +# clear mac_prefix and check it is allocated in a random manner > +ovn-nbctl --wait=hv remove NB_Global . options mac_prefix > +ovn-nbctl ls-add sw9 > +ovn-nbctl --wait=sb set Logical-Switch sw9 other_config:mac_only=true > +ovn-nbctl --wait=sb lsp-add sw9 p91 -- lsp-set-addresses p91 dynamic > + > +mac_prefix=$(ovn-nbctl --wait=sb get NB_Global . options:mac_prefix | awk > -F \" '{print substr($2,0,8)}') > +port_addr=$(ovn-nbctl get Logical-Switch-Port p91 dynamic_addresses | tr > -d \") > +AT_CHECK([test "$port_addr" = "${mac_prefix}:00:00:09"], [0], []) > + > as ovn-sb > OVS_APP_EXIT_AND_WAIT([ovsdb-server]) > > @@ -5981,6 +5992,7 @@ ovn_start > ovn-nbctl lr-add R1 > > # Test for a ping using dynamically allocated addresses. > +ovn-nbctl --wait=hv set NB_Global . options:mac_prefix="0a:00:00:00:00:00" > ovn-nbctl ls-add foo -- add Logical_Switch foo other_config subnet= > 192.168.1.0/24 > ovn-nbctl ls-add alice -- add Logical_Switch alice other_config subnet= > 192.168.2.0/24 > > @@ -12232,6 +12244,7 @@ AT_CLEANUP > AT_SETUP([ovn -- ipam to non-ipam]) > ovn_start > > +ovn-nbctl --wait=hv set NB_Global . options:mac_prefix="0a:00:00:00:00:00" > ovn-nbctl ls-add sw0 > ovn-nbctl lsp-add sw0 p0 -- lsp-set-addresses p0 dynamic > ovn-nbctl --wait=sb add Logical-Switch sw0 other_config subnet= > 192.168.1.0/24 > -- > 2.20.1 > > _______________________________________________ > dev mailing list > dev@openvswitch.org > https://mail.openvswitch.org/mailman/listinfo/ovs-dev >
On Wed, Feb 27, 2019 at 07:01:10PM +0100, Lorenzo Bianconi wrote: > Select a random IPAM mac_prefix if it has not been provided by the user. > With this patch the admin can avoid to configure mac_prefix in order to > avoid L2 address collisions if multiple OVN deployments share the same > broadcast domain. > Remove MAC_ADDR_PREFIX definitions/occurrences since now mac_prefix is > always provided to ovn-northd > > Tested-by: Miguel Duarte de Mora Barroso <mdbarroso@redhat.com> > Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com> > --- > Changes since v2: > - add automatic test case > > Changes since v1: > - add entry in NEWS > - do not modify the idl object in-place but update it running > nbrec_nb_global_set_options It looks to me like this puts a full MAC address in options:mac_prefix, like xx:xx:xx:xx:xx:xx. The documented format for this setting is just xx:xx:xx: <column name="options" key="mac_prefix"> Configure a given OUI to be used as prefix when L2 address is dynamically assigned, e.g. <code>00:11:22</code> </column> On upgrade, I think that this will suddenly change the MAC addresses of all the VMs. Is there a way to avoid that? Should we add a release note?
On Feb 28, Ben Pfaff wrote: > On Wed, Feb 27, 2019 at 07:01:10PM +0100, Lorenzo Bianconi wrote: > > Select a random IPAM mac_prefix if it has not been provided by the user. > > With this patch the admin can avoid to configure mac_prefix in order to > > avoid L2 address collisions if multiple OVN deployments share the same > > broadcast domain. > > Remove MAC_ADDR_PREFIX definitions/occurrences since now mac_prefix is > > always provided to ovn-northd > > > > Tested-by: Miguel Duarte de Mora Barroso <mdbarroso@redhat.com> > > Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com> > > --- > > Changes since v2: > > - add automatic test case > > > > Changes since v1: > > - add entry in NEWS > > - do not modify the idl object in-place but update it running > > nbrec_nb_global_set_options > > It looks to me like this puts a full MAC address in options:mac_prefix, > like xx:xx:xx:xx:xx:xx. The documented format for this setting is just > xx:xx:xx: > > <column name="options" key="mac_prefix"> > Configure a given OUI to be used as prefix when L2 address is > dynamically assigned, e.g. <code>00:11:22</code> > </column> Hi Ben, thx for the review, I will post a v4 fixing this. > > On upgrade, I think that this will suddenly change the MAC addresses of > all the VMs. Is there a way to avoid that? Should we add a release > note? > Do you mean after the upgrade if mac_prefix has not previously set? I added an entry in NEWS but maybe we can add a way to disable it (something like 'legacy mac_prefix'), what do you think? Regards, Lorenzo
On Fri, Mar 01, 2019 at 02:20:04PM +0100, Lorenzo Bianconi wrote: > On Feb 28, Ben Pfaff wrote: > > On upgrade, I think that this will suddenly change the MAC addresses of > > all the VMs. Is there a way to avoid that? Should we add a release > > note? > > Do you mean after the upgrade if mac_prefix has not previously set? I > added an entry in NEWS but maybe we can add a way to disable it > (something like 'legacy mac_prefix'), what do you think? Oh, I asked about this before, didn't I? At least I'm consistent. I guess we can just leave it in NEWS.
diff --git a/NEWS b/NEWS index c86c13a23..b3b347036 100644 --- a/NEWS +++ b/NEWS @@ -17,6 +17,8 @@ Post-v2.11.0 conntrack fragmentation support. * New "ovs-appctl dpctl/ipf-get-status" command for userspace datapath conntrack fragmentation support. + - OVN: + * Select IPAM mac_prefix in a random manner if not provided by the user v2.11.0 - 19 Feb 2019 --------------------- diff --git a/ovn/northd/ovn-northd.c b/ovn/northd/ovn-northd.c index 3569ea2be..373e45573 100644 --- a/ovn/northd/ovn-northd.c +++ b/ovn/northd/ovn-northd.c @@ -62,7 +62,6 @@ static const char *ovnnb_db; static const char *ovnsb_db; static const char *unixctl_path; -#define MAC_ADDR_PREFIX 0x0A0000000000ULL #define MAC_ADDR_SPACE 0xffffff /* MAC address management (macam) table of "struct eth_addr"s, that holds the @@ -937,13 +936,8 @@ ipam_insert_mac(struct eth_addr *ea, bool check) } uint64_t mac64 = eth_addr_to_uint64(*ea); - uint64_t prefix; + uint64_t prefix = eth_addr_to_uint64(mac_prefix); - if (!eth_addr_is_zero(mac_prefix)) { - prefix = eth_addr_to_uint64(mac_prefix); - } else { - prefix = MAC_ADDR_PREFIX; - } /* If the new MAC was not assigned by this address management system or * check is true and the new MAC is a duplicate, do not insert it into the * macam hmap. */ @@ -1056,11 +1050,7 @@ ipam_get_unused_mac(ovs_be32 ip) for (i = 0; i < MAC_ADDR_SPACE - 1; i++) { /* The tentative MAC's suffix will be in the interval (1, 0xfffffe). */ mac_addr_suffix = ((base_addr + i) % (MAC_ADDR_SPACE - 1)) + 1; - if (!eth_addr_is_zero(mac_prefix)) { - mac64 = eth_addr_to_uint64(mac_prefix) | mac_addr_suffix; - } else { - mac64 = MAC_ADDR_PREFIX | mac_addr_suffix; - } + mac64 = eth_addr_to_uint64(mac_prefix) | mac_addr_suffix; eth_addr_from_uint64(mac64, &mac); if (!ipam_is_duplicate_mac(&mac, mac64, true)) { break; @@ -1132,13 +1122,7 @@ dynamic_mac_changed(const char *lsp_addresses, } uint64_t mac64 = eth_addr_to_uint64(update->current_addresses.ea); - uint64_t prefix; - - if (!eth_addr_is_zero(mac_prefix)) { - prefix = eth_addr_to_uint64(mac_prefix); - } else { - prefix = MAC_ADDR_PREFIX; - } + uint64_t prefix = eth_addr_to_uint64(mac_prefix); if ((mac64 ^ prefix) >> 24) { return DYNAMIC; @@ -7300,6 +7284,19 @@ ovnnb_db_run(struct northd_context *ctx, &addr.ea[0], &addr.ea[1], &addr.ea[2])) { mac_prefix = addr; } + } else { + struct smap options; + + smap_clone(&options, &nb->options); + eth_addr_random(&mac_prefix); + memset(&mac_prefix.ea[3], 0, 3); + + char *addr_prefix = xasprintf(ETH_ADDR_FMT, ETH_ADDR_ARGS(mac_prefix)); + smap_add(&options, "mac_prefix", addr_prefix); + nbrec_nb_global_set_options(nb, &options); + + smap_destroy(&options); + free(addr_prefix); } cleanup_macam(&macam); diff --git a/tests/ovn.at b/tests/ovn.at index ec79651bd..84c06204c 100644 --- a/tests/ovn.at +++ b/tests/ovn.at @@ -5596,6 +5596,7 @@ ovn_start # Add a port to a switch that does not have a subnet set, then set the # subnet which should result in an address being allocated for the port. +ovn-nbctl --wait=hv set NB_Global . options:mac_prefix="0a:00:00:00:00:00" ovn-nbctl ls-add sw0 ovn-nbctl lsp-add sw0 p0 -- lsp-set-addresses p0 dynamic ovn-nbctl --wait=sb add Logical-Switch sw0 other_config subnet=192.168.1.0/24 @@ -5963,6 +5964,16 @@ AT_CHECK([ovn-nbctl get Logical-Switch-Port p83 dynamic_addresses], [0], ["00:11:22:00:00:08" ]) +# clear mac_prefix and check it is allocated in a random manner +ovn-nbctl --wait=hv remove NB_Global . options mac_prefix +ovn-nbctl ls-add sw9 +ovn-nbctl --wait=sb set Logical-Switch sw9 other_config:mac_only=true +ovn-nbctl --wait=sb lsp-add sw9 p91 -- lsp-set-addresses p91 dynamic + +mac_prefix=$(ovn-nbctl --wait=sb get NB_Global . options:mac_prefix | awk -F \" '{print substr($2,0,8)}') +port_addr=$(ovn-nbctl get Logical-Switch-Port p91 dynamic_addresses | tr -d \") +AT_CHECK([test "$port_addr" = "${mac_prefix}:00:00:09"], [0], []) + as ovn-sb OVS_APP_EXIT_AND_WAIT([ovsdb-server]) @@ -5981,6 +5992,7 @@ ovn_start ovn-nbctl lr-add R1 # Test for a ping using dynamically allocated addresses. +ovn-nbctl --wait=hv set NB_Global . options:mac_prefix="0a:00:00:00:00:00" ovn-nbctl ls-add foo -- add Logical_Switch foo other_config subnet=192.168.1.0/24 ovn-nbctl ls-add alice -- add Logical_Switch alice other_config subnet=192.168.2.0/24 @@ -12232,6 +12244,7 @@ AT_CLEANUP AT_SETUP([ovn -- ipam to non-ipam]) ovn_start +ovn-nbctl --wait=hv set NB_Global . options:mac_prefix="0a:00:00:00:00:00" ovn-nbctl ls-add sw0 ovn-nbctl lsp-add sw0 p0 -- lsp-set-addresses p0 dynamic ovn-nbctl --wait=sb add Logical-Switch sw0 other_config subnet=192.168.1.0/24