845         ixa->ixa_conn_id = oldixa->ixa_conn_id;
 846         connp->conn_ixa = ixa;
 847         return (oldixa);
 848 }
 849 
 850 /*
 851  * Return a ip_xmit_attr_t to use with a conn_t that is based on but
 852  * separate from conn_ixa.
 853  *
 854  * This "safe" copy has the pointers set to NULL
 855  * (since the pointers might be changed by another thread using
 856  * conn_ixa). The caller needs to check for NULL pointers to see
 857  * if ip_set_destination needs to be called to re-establish the pointers.
 858  */
 859 ip_xmit_attr_t *
 860 conn_get_ixa_exclusive(conn_t *connp)
 861 {
 862         ip_xmit_attr_t *oldixa;
 863         ip_xmit_attr_t *ixa;
 864 
 865         ixa = kmem_alloc(sizeof (*ixa), KM_NOSLEEP | KM_NORMALPRI);
 866         if (ixa == NULL)
 867                 return (NULL);
 868 
 869         mutex_enter(&connp->conn_lock);
 870 
 871         oldixa = connp->conn_ixa;
 872         IXA_REFHOLD(oldixa);
 873 
 874         ixa_safe_copy(oldixa, ixa);
 875         mutex_exit(&connp->conn_lock);
 876         IXA_REFRELE(oldixa);
 877         return (ixa);
 878 }
 879 
 880 void
 881 ixa_safe_copy(ip_xmit_attr_t *src, ip_xmit_attr_t *ixa)
 882 {
 883         bcopy(src, ixa, sizeof (*ixa));
 884         ixa->ixa_refcnt = 1;
 885         /*

 845         ixa->ixa_conn_id = oldixa->ixa_conn_id;
 846         connp->conn_ixa = ixa;
 847         return (oldixa);
 848 }
 849 
 850 /*
 851  * Return a ip_xmit_attr_t to use with a conn_t that is based on but
 852  * separate from conn_ixa.
 853  *
 854  * This "safe" copy has the pointers set to NULL
 855  * (since the pointers might be changed by another thread using
 856  * conn_ixa). The caller needs to check for NULL pointers to see
 857  * if ip_set_destination needs to be called to re-establish the pointers.
 858  */
 859 ip_xmit_attr_t *
 860 conn_get_ixa_exclusive(conn_t *connp)
 861 {
 862         ip_xmit_attr_t *oldixa;
 863         ip_xmit_attr_t *ixa;
 864 
 865         ixa = kmem_alloc(sizeof (*ixa), KM_NOSLEEP_LAZY);
 866         if (ixa == NULL)
 867                 return (NULL);
 868 
 869         mutex_enter(&connp->conn_lock);
 870 
 871         oldixa = connp->conn_ixa;
 872         IXA_REFHOLD(oldixa);
 873 
 874         ixa_safe_copy(oldixa, ixa);
 875         mutex_exit(&connp->conn_lock);
 876         IXA_REFRELE(oldixa);
 877         return (ixa);
 878 }
 879 
 880 void
 881 ixa_safe_copy(ip_xmit_attr_t *src, ip_xmit_attr_t *ixa)
 882 {
 883         bcopy(src, ixa, sizeof (*ixa));
 884         ixa->ixa_refcnt = 1;
 885         /*