[ovs-dev] [PATCH v4 ovn 1/6] Avoid case-sensitive MAC address comparisons.

Numan Siddique numans at ovn.org
Fri Jun 26 08:38:36 UTC 2020


On Thu, Jun 25, 2020 at 12:51 AM Mark Michelson <mmichels at redhat.com> wrote:

> Hex digits in MAC addresses can be represented as either capital or
> lowercase, and they're equal. Using strcmp to compare MAC addresses has
> the potential to compare MAC addresses as different when they represent
> the same address.
>
> This commit fixes the issue by converting the string representation to
> the binary representation and comparing that instead.
>
> Reported at: https://bugzilla.redhat.com/show_bug.cgi?id=1829059
> Signed-off-by: Mark Michelson <mmichels at redhat.com>
>

Acked-by: Numan Siddique <numans at ovn.org> for all whole series.

I think you can add the below tag in the commit message of thi patch.

Fixes: ba0d6eae960d("ovn-northd: Add support for Load Balancer health
check")


Thanks
Numan

---
>  northd/ovn-northd.c   | 17 ++++++++---------
>  tests/ovn.at          |  9 +++++++++
>  utilities/ovn-nbctl.c | 16 +++++++++-------
>  3 files changed, 26 insertions(+), 16 deletions(-)
>
> diff --git a/northd/ovn-northd.c b/northd/ovn-northd.c
> index eb78f317e..cf3cffd67 100644
> --- a/northd/ovn-northd.c
> +++ b/northd/ovn-northd.c
> @@ -91,6 +91,7 @@ static bool controller_event_en;
>   * defined in Service_Monitor Southbound table. Since these packets
>   * all locally handled, having just one mac is good enough. */
>  static char svc_monitor_mac[ETH_ADDR_STRLEN + 1];
> +static struct eth_addr svc_monitor_mac_ea;
>
>  /* Default probe interval for NB and SB DB connections. */
>  #define DEFAULT_PROBE_INTERVAL_MSEC 5000
> @@ -3321,8 +3322,10 @@ ovn_lb_create(struct northd_context *ctx, struct
> hmap *lbs,
>                  ovs_assert(mon_info);
>                  sbrec_service_monitor_set_options(
>                      mon_info->sbrec_mon, &lb_health_check->options);
> +                struct eth_addr ea;
>                  if (!mon_info->sbrec_mon->src_mac ||
> -                    strcmp(mon_info->sbrec_mon->src_mac,
> svc_monitor_mac)) {
> +                    !eth_addr_from_string(mon_info->sbrec_mon->src_mac,
> &ea) ||
> +                    !eth_addr_equals(ea, svc_monitor_mac_ea)) {
>                      sbrec_service_monitor_set_src_mac(mon_info->sbrec_mon,
>                                                        svc_monitor_mac);
>                  }
> @@ -11061,12 +11064,9 @@ ovnnb_db_run(struct northd_context *ctx,
>
>      const char *monitor_mac = smap_get(&nb->options, "svc_monitor_mac");
>      if (monitor_mac) {
> -        struct eth_addr addr;
> -
> -        memset(&addr, 0, sizeof addr);
> -        if (eth_addr_from_string(monitor_mac, &addr)) {
> +        if (eth_addr_from_string(monitor_mac, &svc_monitor_mac_ea)) {
>              snprintf(svc_monitor_mac, sizeof svc_monitor_mac,
> -                     ETH_ADDR_FMT, ETH_ADDR_ARGS(addr));
> +                     ETH_ADDR_FMT, ETH_ADDR_ARGS(svc_monitor_mac_ea));
>          } else {
>              monitor_mac = NULL;
>          }
> @@ -11087,10 +11087,9 @@ ovnnb_db_run(struct northd_context *ctx,
>          }
>
>          if (!monitor_mac) {
> -            struct eth_addr addr;
> -            eth_addr_random(&addr);
> +            eth_addr_random(&svc_monitor_mac_ea);
>              snprintf(svc_monitor_mac, sizeof svc_monitor_mac,
> -                     ETH_ADDR_FMT, ETH_ADDR_ARGS(addr));
> +                     ETH_ADDR_FMT, ETH_ADDR_ARGS(svc_monitor_mac_ea));
>              smap_replace(&options, "svc_monitor_mac", svc_monitor_mac);
>          }
>
> diff --git a/tests/ovn.at b/tests/ovn.at
> index 15b40ca1e..9181b8425 100644
> --- a/tests/ovn.at
> +++ b/tests/ovn.at
> @@ -19720,3 +19720,12 @@ AT_CHECK([test 2287 = `ovs-ofctl dump-group-stats
> br-int | grep -o bucket | wc -
>
>  OVN_CLEANUP([hv1])
>  AT_CLEANUP
> +
> +AT_SETUP([ovn -- case-insensitive lrp-add])
> +ovn_start
> +
> +ovn-nbctl lr-add r1
> +ovn-nbctl lrp-add r1 rp1 CC:DD:EE:EE:DD:CC
> +
> +AT_CHECK([ovn-nbctl --may-exist lrp-add r1 rp1 cc:dd:ee:ee:dd:cc])
> +AT_CLEANUP
> diff --git a/utilities/ovn-nbctl.c b/utilities/ovn-nbctl.c
> index 6ccc7025d..638e6f7c0 100644
> --- a/utilities/ovn-nbctl.c
> +++ b/utilities/ovn-nbctl.c
> @@ -4678,6 +4678,12 @@ nbctl_lrp_add(struct ctl_context *ctx)
>      char **settings = (char **) &ctx->argv[n_networks + 4];
>      int n_settings = ctx->argc - 4 - n_networks;
>
> +    struct eth_addr ea;
> +    if (!eth_addr_from_string(mac, &ea)) {
> +        ctl_error(ctx, "%s: invalid mac address %s", lrp_name, mac);
> +        return;
> +    }
> +
>      const struct nbrec_logical_router_port *lrp;
>      error = lrp_by_name_or_uuid(ctx, lrp_name, false, &lrp);
>      if (error) {
> @@ -4704,7 +4710,9 @@ nbctl_lrp_add(struct ctl_context *ctx)
>              return;
>          }
>
> -        if (strcmp(mac, lrp->mac)) {
> +        struct eth_addr lrp_ea;
> +        eth_addr_from_string(lrp->mac, &lrp_ea);
> +        if (!eth_addr_equals(ea, lrp_ea)) {
>              ctl_error(ctx, "%s: port already exists with mac %s",
> lrp_name,
>                        lrp->mac);
>              return;
> @@ -4746,12 +4754,6 @@ nbctl_lrp_add(struct ctl_context *ctx)
>          return;
>      }
>
> -    struct eth_addr ea;
> -    if (!eth_addr_from_string(mac, &ea)) {
> -        ctl_error(ctx, "%s: invalid mac address %s", lrp_name, mac);
> -        return;
> -    }
> -
>      for (int i = 0; i < n_networks; i++) {
>          ovs_be32 ipv4;
>          unsigned int plen;
> --
> 2.25.4
>
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