-static ovs_be16
-get_be16(const void **pp)
-{
- const ovs_be16 *p = *pp;
- ovs_be16 value = *p;
- *pp = p + 1;
- return value;
-}
-
-static ovs_be32
-get_be32(const void **pp)
-{
- const ovs_be32 *p = *pp;
- ovs_be32 value = get_unaligned_be32(p);
- *pp = p + 1;
- return value;
-}
-
-static void
-get_subfield(int n_bits, const void **p, struct mf_subfield *sf)
-{
- sf->field = mf_from_nxm_header(ntohl(get_be32(p)));
- sf->ofs = ntohs(get_be16(p));
- sf->n_bits = n_bits;
-}
-
-static unsigned int
-learn_min_len(uint16_t header)
-{
- int n_bits = header & NX_LEARN_N_BITS_MASK;
- int src_type = header & NX_LEARN_SRC_MASK;
- int dst_type = header & NX_LEARN_DST_MASK;
- unsigned int min_len;
-
- min_len = 0;
- if (src_type == NX_LEARN_SRC_FIELD) {
- min_len += sizeof(ovs_be32); /* src_field */
- min_len += sizeof(ovs_be16); /* src_ofs */
- } else {
- min_len += DIV_ROUND_UP(n_bits, 16);
- }
- if (dst_type == NX_LEARN_DST_MATCH ||
- dst_type == NX_LEARN_DST_LOAD) {
- min_len += sizeof(ovs_be32); /* dst_field */
- min_len += sizeof(ovs_be16); /* dst_ofs */
- }
- return min_len;
-}
-
-/* Converts 'nal' into a "struct ofpact_learn" and appends that struct to
- * 'ofpacts'. Returns 0 if successful, otherwise an OFPERR_*. */
-enum ofperr
-learn_from_openflow(const struct nx_action_learn *nal, struct ofpbuf *ofpacts)
-{
- struct ofpact_learn *learn;
- const void *p, *end;
-
- if (nal->pad) {
- return OFPERR_OFPBAC_BAD_ARGUMENT;
- }
-
- learn = ofpact_put_LEARN(ofpacts);
-
- learn->idle_timeout = ntohs(nal->idle_timeout);
- learn->hard_timeout = ntohs(nal->hard_timeout);
- learn->priority = ntohs(nal->priority);
- learn->cookie = nal->cookie;
- learn->table_id = nal->table_id;
- learn->fin_idle_timeout = ntohs(nal->fin_idle_timeout);
- learn->fin_hard_timeout = ntohs(nal->fin_hard_timeout);
-
- learn->flags = ntohs(nal->flags);
- if (learn->flags & ~(NX_LEARN_F_SEND_FLOW_REM |
- NX_LEARN_F_DELETE_LEARNED)) {
- return OFPERR_OFPBAC_BAD_ARGUMENT;
- }
-
- if (learn->table_id == 0xff) {
- return OFPERR_OFPBAC_BAD_ARGUMENT;
- }
-
- end = (char *) nal + ntohs(nal->len);
- for (p = nal + 1; p != end; ) {
- struct ofpact_learn_spec *spec;
- uint16_t header = ntohs(get_be16(&p));
-
- if (!header) {
- break;
- }
-
- spec = ofpbuf_put_zeros(ofpacts, sizeof *spec);
- learn = ofpacts->frame;
- learn->n_specs++;
-
- spec->src_type = header & NX_LEARN_SRC_MASK;
- spec->dst_type = header & NX_LEARN_DST_MASK;
- spec->n_bits = header & NX_LEARN_N_BITS_MASK;
-
- /* Check for valid src and dst type combination. */
- if (spec->dst_type == NX_LEARN_DST_MATCH ||
- spec->dst_type == NX_LEARN_DST_LOAD ||
- (spec->dst_type == NX_LEARN_DST_OUTPUT &&
- spec->src_type == NX_LEARN_SRC_FIELD)) {
- /* OK. */
- } else {
- return OFPERR_OFPBAC_BAD_ARGUMENT;
- }
-
- /* Check that the arguments don't overrun the end of the action. */
- if ((char *) end - (char *) p < learn_min_len(header)) {
- return OFPERR_OFPBAC_BAD_LEN;
- }
-
- /* Get the source. */
- if (spec->src_type == NX_LEARN_SRC_FIELD) {
- get_subfield(spec->n_bits, &p, &spec->src);
- } else {
- int p_bytes = 2 * DIV_ROUND_UP(spec->n_bits, 16);
-
- bitwise_copy(p, p_bytes, 0,
- &spec->src_imm, sizeof spec->src_imm, 0,
- spec->n_bits);
- p = (const uint8_t *) p + p_bytes;
- }
-
- /* Get the destination. */
- if (spec->dst_type == NX_LEARN_DST_MATCH ||
- spec->dst_type == NX_LEARN_DST_LOAD) {
- get_subfield(spec->n_bits, &p, &spec->dst);
- }
- }
- ofpact_update_len(ofpacts, &learn->ofpact);
-
- if (!is_all_zeros(p, (char *) end - (char *) p)) {
- return OFPERR_OFPBAC_BAD_ARGUMENT;
- }
-
- return 0;
-}