Dear all:

struct secashead defined in keydb.h line 89:

/* Security Association Data Base */
struct secashead {
   LIST_ENTRY(secashead) chain;

   struct secasindex saidx;

   struct secident *idents;    /* source identity */
   struct secident *identd;    /* destination identity */
                   /* XXX I don't know how to use them. */

   u_int8_t state;            /* MATURE or DEAD. */
   LIST_HEAD(_satree, secasvar) savtree[SADB_SASTATE_MAX+1];
                   /* SA chain */
                   /* The first of this list is newer SA */

   struct route sa_route;        /* route cache */
};

The last field "sa_route" is "struct route", whose space is not enough for IPv6 address. However, in ipsec6_output_tunnel() in ipsec_output.c, the field could possibly be assigned with an IPv6 address.

My suggestion is to enlarge the field as struct route_in6, which could accommodate both IPv4 and IPv6 address.

BR,
blue


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