/* Returns NULL if successful, otherwise a malloc()'d string describing the * error. The caller is responsible for freeing the returned string. */ static char * WARN_UNUSED_RESULT learn_parse__(char *orig, char *arg, struct ofpbuf *ofpacts) { struct ofpact_learn *learn; struct match match; char *name, *value; learn = ofpact_put_LEARN(ofpacts); learn->idle_timeout = OFP_FLOW_PERMANENT; learn->hard_timeout = OFP_FLOW_PERMANENT; learn->priority = OFP_DEFAULT_PRIORITY; learn->table_id = 1; match_init_catchall(&match); while (ofputil_parse_key_value(&arg, &name, &value)) { if (!strcmp(name, "table")) { learn->table_id = atoi(value); if (learn->table_id == 255) { return xasprintf("%s: table id 255 not valid for `learn' " "action", orig); } } else if (!strcmp(name, "priority")) { learn->priority = atoi(value); } else if (!strcmp(name, "idle_timeout")) { learn->idle_timeout = atoi(value); } else if (!strcmp(name, "hard_timeout")) { learn->hard_timeout = atoi(value); } else if (!strcmp(name, "fin_idle_timeout")) { learn->fin_idle_timeout = atoi(value); } else if (!strcmp(name, "fin_hard_timeout")) { learn->fin_hard_timeout = atoi(value); } else if (!strcmp(name, "cookie")) { learn->cookie = strtoull(value, NULL, 0); } else { struct ofpact_learn_spec *spec; char *error; spec = ofpbuf_put_zeros(ofpacts, sizeof *spec); learn = ofpacts->frame; learn->n_specs++; error = learn_parse_spec(orig, name, value, spec); if (error) { return error; } /* Update 'match' 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, &match); } } } ofpact_update_len(ofpacts, &learn->ofpact); return NULL; }
/* Returns NULL if successful, otherwise a malloc()'d string describing the * error. The caller is responsible for freeing the returned string. */ static char * OVS_WARN_UNUSED_RESULT learn_parse__(char *orig, char *arg, struct ofpbuf *ofpacts) { struct ofpact_learn *learn; struct match match; char *name, *value; learn = ofpact_put_LEARN(ofpacts); learn->idle_timeout = OFP_FLOW_PERMANENT; learn->hard_timeout = OFP_FLOW_PERMANENT; learn->priority = OFP_DEFAULT_PRIORITY; learn->table_id = 1; match_init_catchall(&match); while (ofputil_parse_key_value(&arg, &name, &value)) { if (!strcmp(name, "table")) { learn->table_id = atoi(value); if (learn->table_id == 255) { return xasprintf("%s: table id 255 not valid for `learn' " "action", orig); } } else if (!strcmp(name, "priority")) { learn->priority = atoi(value); } else if (!strcmp(name, "idle_timeout")) { learn->idle_timeout = atoi(value); } else if (!strcmp(name, "hard_timeout")) { learn->hard_timeout = atoi(value); } else if (!strcmp(name, "fin_idle_timeout")) { learn->fin_idle_timeout = atoi(value); } else if (!strcmp(name, "fin_hard_timeout")) { learn->fin_hard_timeout = atoi(value); } else if (!strcmp(name, "cookie")) { learn->cookie = htonll(strtoull(value, NULL, 0)); } else if (!strcmp(name, "send_flow_rem")) { learn->flags |= NX_LEARN_F_SEND_FLOW_REM; } else if (!strcmp(name, "delete_learned")) { learn->flags |= NX_LEARN_F_DELETE_LEARNED; } else { struct ofpact_learn_spec *spec; char *error; spec = ofpbuf_put_zeros(ofpacts, sizeof *spec); error = learn_parse_spec(orig, name, value, spec, ofpacts, &match); if (error) { return error; } learn = ofpacts->header; } } ofpact_finish_LEARN(ofpacts, &learn); return NULL; }
/* 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); }