I guess technically it's not needed. I carried it over because it's a
small and potentially useful change. However I also see a point in not
bloating the code with unused feature, so feel free to drop it.

Martin.

On Thu, 2025-02-13 at 14:45 +0100, Dumitru Ceara wrote:
> On 2/13/25 2:33 PM, Martin Kalcok wrote:
> > From: Frode Nordahl <[email protected]>
> > 
> > While IPv6 and NAT does not ring particularly well together in my
> > mind, it is a supported feature.
> > 
> > We need this function to allow them in a subsequent patch adding
> > host route exchange for NAT addresses.
> > 
> > Signed-off-by: Frode Nordahl <[email protected]>
> > Signed-off-by: Martin Kalcok <[email protected]>
> > ---
> 
> Hi Martin, Frode,
> 
> Is this patch still needed?  I don't think we use get_nat_addresses()
> anymore, do we?
> 
> Regards,
> Dumitru
> 
> >  northd/northd.c | 22 +++++++++++++++++-----
> >  1 file changed, 17 insertions(+), 5 deletions(-)
> > 
> > diff --git a/northd/northd.c b/northd/northd.c
> > index 1097bb159..9fa627db7 100644
> > --- a/northd/northd.c
> > +++ b/northd/northd.c
> > @@ -1200,7 +1200,8 @@ destroy_routable_addresses(struct
> > ovn_port_routable_addresses *ra)
> >  
> >  static char **get_nat_addresses(const struct ovn_port *op, size_t
> > *n,
> >                                  bool routable_only, bool
> > include_lb_ips,
> > -                                const struct lr_stateful_record
> > *);
> > +                                const struct lr_stateful_record *,
> > +                                bool allow_ipv6);
> >  
> >  struct ovn_port_routable_addresses
> >  get_op_addresses(const struct ovn_port *op,
> > @@ -1209,7 +1210,7 @@ get_op_addresses(const struct ovn_port *op,
> >  {
> >      size_t n;
> >      char **nats = get_nat_addresses(op, &n, routable_only, true,
> > -                                    lr_stateful_rec);
> > +                                    lr_stateful_rec, false);
> >  
> >      if (!nats) {
> >          return (struct ovn_port_routable_addresses) {
> > @@ -2627,7 +2628,8 @@ join_logical_ports(const struct
> > sbrec_port_binding_table *sbrec_pb_table,
> >  static char **
> >  get_nat_addresses(const struct ovn_port *op, size_t *n, bool
> > routable_only,
> >                    bool include_lb_ips,
> > -                  const struct lr_stateful_record
> > *lr_stateful_rec)
> > +                  const struct lr_stateful_record
> > *lr_stateful_rec,
> > +                  bool allow_ipv6)
> >  {
> >      size_t n_nats = 0;
> >      struct eth_addr mac;
> > @@ -2650,6 +2652,7 @@ get_nat_addresses(const struct ovn_port *op,
> > size_t *n, bool routable_only,
> >      for (size_t i = 0; i < op->od->nbr->n_nat; i++) {
> >          const struct nbrec_nat *nat = op->od->nbr->nat[i];
> >          ovs_be32 ip, mask;
> > +        struct in6_addr ip6, mask6;
> >  
> >          if (routable_only &&
> >              (!strcmp(nat->type, "snat") ||
> > @@ -2660,7 +2663,15 @@ get_nat_addresses(const struct ovn_port *op,
> > size_t *n, bool routable_only,
> >          char *error = ip_parse_masked(nat->external_ip, &ip,
> > &mask);
> >          if (error || mask != OVS_BE32_MAX) {
> >              free(error);
> > -            continue;
> > +            if (allow_ipv6) {
> > +                error = ipv6_parse_masked(nat->external_ip, &ip6,
> > &mask6);
> > +                if (error || ipv6_count_cidr_bits(&mask6) != 128)
> > {
> > +                    free(error);
> > +                    continue;
> > +                }
> > +            } else {
> > +                continue;
> > +            }
> >          }
> >  
> >          /* Not including external IP of NAT rules whose
> > gateway_port is
> > @@ -4049,7 +4060,8 @@ sync_pb_for_lsp(struct ovn_port *op,
> >                          lr_stateful_table, op->peer->od->index);
> >                  }
> >                  nats = get_nat_addresses(op->peer, &n_nats, false,
> > -                                         include_lb_vips,
> > lr_stateful_rec);
> > +                                         include_lb_vips,
> > lr_stateful_rec,
> > +                                         false);
> >              }
> >          } else if (nat_addresses && (chassis || l3dgw_ports)) {
> >              struct lport_addresses laddrs;
> 

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