/* Converts 'learn' into a "struct nx_action_learn" and appends that action to * 'ofpacts'. */ void learn_to_nxast(const struct ofpact_learn *learn, struct ofpbuf *openflow) { const struct ofpact_learn_spec *spec; struct nx_action_learn *nal; size_t start_ofs; start_ofs = openflow->size; nal = ofputil_put_NXAST_LEARN(openflow); nal->idle_timeout = htons(learn->idle_timeout); nal->hard_timeout = htons(learn->hard_timeout); nal->fin_idle_timeout = htons(learn->fin_idle_timeout); nal->fin_hard_timeout = htons(learn->fin_hard_timeout); nal->priority = htons(learn->priority); nal->cookie = htonll(learn->cookie); nal->flags = htons(learn->flags); nal->table_id = learn->table_id; for (spec = learn->specs; spec < &learn->specs[learn->n_specs]; spec++) { put_u16(openflow, spec->n_bits | spec->dst_type | spec->src_type); if (spec->src_type == NX_LEARN_SRC_FIELD) { put_u32(openflow, spec->src.field->nxm_header); put_u16(openflow, spec->src.ofs); } else { size_t n_dst_bytes = 2 * DIV_ROUND_UP(spec->n_bits, 16); uint8_t *bits = ofpbuf_put_zeros(openflow, n_dst_bytes); bitwise_copy(&spec->src_imm, sizeof spec->src_imm, 0, bits, n_dst_bytes, 0, spec->n_bits); } if (spec->dst_type == NX_LEARN_DST_MATCH || spec->dst_type == NX_LEARN_DST_LOAD) { put_u32(openflow, spec->dst.field->nxm_header); put_u16(openflow, spec->dst.ofs); } } if ((openflow->size - start_ofs) % 8) { ofpbuf_put_zeros(openflow, 8 - (openflow->size - start_ofs) % 8); } nal = ofpbuf_at_assert(openflow, start_ofs, sizeof *nal); nal->len = htons(openflow->size - start_ofs); }
/* Parses 'arg' as a set of arguments to the "learn" action and appends a * matching NXAST_LEARN action to 'b'. The format parsed is described in * ovs-ofctl(8). * * Prints an error on stderr and aborts the program if 'arg' syntax is invalid. * * If 'flow' is nonnull, then it should be the flow from a cls_rule that is * the matching rule for the learning action. This helps to better validate * the action's arguments. * * Modifies 'arg'. */ void learn_parse(struct ofpbuf *b, char *arg, const struct flow *flow) { char *orig = xstrdup(arg); char *name, *value; enum ofperr error; size_t learn_ofs; size_t len; struct nx_action_learn *learn; struct cls_rule rule; learn_ofs = b->size; learn = ofputil_put_NXAST_LEARN(b); learn->idle_timeout = htons(OFP_FLOW_PERMANENT); learn->hard_timeout = htons(OFP_FLOW_PERMANENT); learn->priority = htons(OFP_DEFAULT_PRIORITY); learn->cookie = htonll(0); learn->flags = htons(0); learn->table_id = 1; cls_rule_init_catchall(&rule, 0); while (ofputil_parse_key_value(&arg, &name, &value)) { learn = ofpbuf_at_assert(b, learn_ofs, sizeof *learn); if (!strcmp(name, "table")) { learn->table_id = atoi(value); if (learn->table_id == 255) { ovs_fatal(0, "%s: table id 255 not valid for `learn' action", orig); } } else if (!strcmp(name, "priority")) { learn->priority = htons(atoi(value)); } else if (!strcmp(name, "idle_timeout")) { learn->idle_timeout = htons(atoi(value)); } else if (!strcmp(name, "hard_timeout")) { learn->hard_timeout = htons(atoi(value)); } else if (!strcmp(name, "fin_idle_timeout")) { learn->fin_idle_timeout = htons(atoi(value)); } else if (!strcmp(name, "fin_hard_timeout")) { learn->fin_hard_timeout = htons(atoi(value)); } else if (!strcmp(name, "cookie")) { learn->cookie = htonll(strtoull(value, NULL, 0)); } else { struct learn_spec spec; learn_parse_spec(orig, name, value, &spec); /* Check prerequisites. */ if (spec.src_type == NX_LEARN_SRC_FIELD && flow && !mf_are_prereqs_ok(spec.src.field, flow)) { ovs_fatal(0, "%s: cannot specify source field %s because " "prerequisites are not satisfied", orig, spec.src.field->name); } if ((spec.dst_type == NX_LEARN_DST_MATCH || spec.dst_type == NX_LEARN_DST_LOAD) && !mf_are_prereqs_ok(spec.dst.field, &rule.flow)) { ovs_fatal(0, "%s: cannot specify destination field %s because " "prerequisites are not satisfied", orig, spec.dst.field->name); } /* Update 'rule' to allow for satisfying destination * prerequisites. */ if (spec.src_type == NX_LEARN_SRC_IMMEDIATE && spec.dst_type == NX_LEARN_DST_MATCH) { mf_write_subfield(&spec.dst, &spec.src_imm, &rule); } /* Output the flow_mod_spec. */ put_u16(b, spec.n_bits | spec.src_type | spec.dst_type); if (spec.src_type == NX_LEARN_SRC_IMMEDIATE) { int n_bytes = DIV_ROUND_UP(spec.n_bits, 16) * 2; int ofs = sizeof spec.src_imm - n_bytes; ofpbuf_put(b, &spec.src_imm.u8[ofs], n_bytes); } else { put_u32(b, spec.src.field->nxm_header); put_u16(b, spec.src.ofs); } if (spec.dst_type == NX_LEARN_DST_MATCH || spec.dst_type == NX_LEARN_DST_LOAD) { put_u32(b, spec.dst.field->nxm_header); put_u16(b, spec.dst.ofs); } else { assert(spec.dst_type == NX_LEARN_DST_OUTPUT); } } } put_u16(b, 0); len = b->size - learn_ofs; if (len % 8) { ofpbuf_put_zeros(b, 8 - len % 8); } learn = ofpbuf_at_assert(b, learn_ofs, sizeof *learn); learn->len = htons(b->size - learn_ofs); /* In theory the above should have caught any errors, but... */ if (flow) { error = learn_check(learn, flow); if (error) { ovs_fatal(0, "%s: %s", orig, ofperr_to_string(error)); } } free(orig); }