static bool
str_to_ofpact__(char *pos, char *act, char *arg,
struct ofpbuf *ofpacts, int n_actions)
{
int code = ofputil_action_code_from_name(act);
if (code >= 0) {
parse_named_action(code, arg, ofpacts);
} else if (!strcasecmp(act, "drop")) {
if (n_actions) {
ovs_fatal(0, "Drop actions must not be preceded by other "
"actions");
} else if (ofputil_parse_key_value(&pos, &act, &arg)) {
ovs_fatal(0, "Drop actions must not be followed by other "
"actions");
}
return false;
} else {
ofp_port_t port;
if (ofputil_port_from_string(act, &port)) {
ofpact_put_OUTPUT(ofpacts)->port = port;
} else {
ovs_fatal(0, "Unknown action: %s", act);
}
}
return true;
}
static void
parse_resubmit(char *arg, struct ofpbuf *ofpacts)
{
struct ofpact_resubmit *resubmit;
char *in_port_s, *table_s;
resubmit = ofpact_put_RESUBMIT(ofpacts);
in_port_s = strsep(&arg, ",");
if (in_port_s && in_port_s[0]) {
if (!ofputil_port_from_string(in_port_s, &resubmit->in_port)) {
ovs_fatal(0, "%s: resubmit to unknown port", in_port_s);
}
} else {
resubmit->in_port = OFPP_IN_PORT;
}
table_s = strsep(&arg, ",");
resubmit->table_id = table_s && table_s[0] ? str_to_u32(table_s) : 255;
if (resubmit->in_port == OFPP_IN_PORT && resubmit->table_id == 255) {
ovs_fatal(0, "at least one \"in_port\" or \"table\" must be specified "
" on resubmit");
}
}
static void
parse_resubmit(struct ofpbuf *b, char *arg)
{
struct nx_action_resubmit *nar;
char *in_port_s, *table_s;
uint16_t in_port;
uint8_t table;
in_port_s = strsep(&arg, ",");
if (in_port_s && in_port_s[0]) {
if (!ofputil_port_from_string(in_port_s, &in_port)) {
in_port = str_to_u32(in_port_s);
}
} else {
in_port = OFPP_IN_PORT;
}
table_s = strsep(&arg, ",");
table = table_s && table_s[0] ? str_to_u32(table_s) : 255;
if (in_port == OFPP_IN_PORT && table == 255) {
ovs_fatal(0, "at least one \"in_port\" or \"table\" must be specified "
" on resubmit");
}
if (in_port != OFPP_IN_PORT && table == 255) {
nar = ofputil_put_NXAST_RESUBMIT(b);
} else {
nar = ofputil_put_NXAST_RESUBMIT_TABLE(b);
nar->table = table;
}
nar->in_port = htons(in_port);
}
static void
str_to_action(const struct flow *flow, char *str, struct ofpbuf *b)
{
char *pos, *act, *arg;
int n_actions;
pos = str;
n_actions = 0;
while (ofputil_parse_key_value(&pos, &act, &arg)) {
uint16_t port;
int code;
code = ofputil_action_code_from_name(act);
if (code >= 0) {
parse_named_action(code, flow, b, arg);
} else if (!strcasecmp(act, "drop")) {
/* A drop action in OpenFlow occurs by just not setting
* an action. */
if (n_actions) {
ovs_fatal(0, "Drop actions must not be preceded by other "
"actions");
} else if (ofputil_parse_key_value(&pos, &act, &arg)) {
ovs_fatal(0, "Drop actions must not be followed by other "
"actions");
}
break;
} else if (!strcasecmp(act, "CONTROLLER")) {
struct ofp_action_output *oao;
oao = put_output_action(b, OFPP_CONTROLLER);
/* Unless a numeric argument is specified, we send the whole
* packet to the controller. */
if (arg[0] && (strspn(arg, "0123456789") == strlen(arg))) {
oao->max_len = htons(str_to_u32(arg));
} else {
oao->max_len = htons(UINT16_MAX);
}
} else if (ofputil_port_from_string(act, &port)) {
put_output_action(b, port);
} else {
ovs_fatal(0, "Unknown action: %s", act);
}
n_actions++;
}
}
/* Convert 'str_' (as described in the Flow Syntax section of the ovs-ofctl man
* page) into 'fm' for sending the specified flow_mod 'command' to a switch.
* If 'actions' is specified, an action must be in 'string' and may be expanded
* or reallocated.
*
* To parse syntax for an OFPT_FLOW_MOD (or NXT_FLOW_MOD), use an OFPFC_*
* constant for 'command'. To parse syntax for an OFPST_FLOW or
* OFPST_AGGREGATE (or NXST_FLOW or NXST_AGGREGATE), use -1 for 'command'. */
void
parse_ofp_str(struct ofputil_flow_mod *fm, int command, const char *str_,
bool verbose)
{
enum {
F_OUT_PORT = 1 << 0,
F_ACTIONS = 1 << 1,
F_TIMEOUT = 1 << 3,
F_PRIORITY = 1 << 4,
F_FLAGS = 1 << 5,
} fields;
char *string = xstrdup(str_);
char *save_ptr = NULL;
char *act_str = NULL;
char *name;
switch (command) {
case -1:
fields = F_OUT_PORT;
break;
case OFPFC_ADD:
fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
break;
case OFPFC_DELETE:
fields = F_OUT_PORT;
break;
case OFPFC_DELETE_STRICT:
fields = F_OUT_PORT | F_PRIORITY;
break;
case OFPFC_MODIFY:
fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
break;
case OFPFC_MODIFY_STRICT:
fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
break;
default:
NOT_REACHED();
}
match_init_catchall(&fm->match);
fm->priority = OFP_DEFAULT_PRIORITY;
fm->cookie = htonll(0);
fm->cookie_mask = htonll(0);
if (command == OFPFC_MODIFY || command == OFPFC_MODIFY_STRICT) {
/* For modify, by default, don't update the cookie. */
fm->new_cookie = htonll(UINT64_MAX);
} else{
fm->new_cookie = htonll(0);
}
fm->table_id = 0xff;
fm->command = command;
fm->idle_timeout = OFP_FLOW_PERMANENT;
fm->hard_timeout = OFP_FLOW_PERMANENT;
fm->buffer_id = UINT32_MAX;
fm->out_port = OFPP_ANY;
fm->flags = 0;
if (fields & F_ACTIONS) {
act_str = strstr(string, "action");
if (!act_str) {
ofp_fatal(str_, verbose, "must specify an action");
}
*act_str = '\0';
act_str = strchr(act_str + 1, '=');
if (!act_str) {
ofp_fatal(str_, verbose, "must specify an action");
}
act_str++;
}
for (name = strtok_r(string, "=, \t\r\n", &save_ptr); name;
name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
const struct protocol *p;
if (parse_protocol(name, &p)) {
match_set_dl_type(&fm->match, htons(p->dl_type));
if (p->nw_proto) {
match_set_nw_proto(&fm->match, p->nw_proto);
}
} else if (fields & F_FLAGS && !strcmp(name, "send_flow_rem")) {
fm->flags |= OFPFF_SEND_FLOW_REM;
} else if (fields & F_FLAGS && !strcmp(name, "check_overlap")) {
fm->flags |= OFPFF_CHECK_OVERLAP;
} else if (fields & F_FLAGS && !strcmp(name, "reset_counts")) {
fm->flags |= OFPFF12_RESET_COUNTS;
} else if (fields & F_FLAGS && !strcmp(name, "no_packet_counts")) {
fm->flags |= OFPFF13_NO_PKT_COUNTS;
} else if (fields & F_FLAGS && !strcmp(name, "no_byte_counts")) {
fm->flags |= OFPFF13_NO_BYT_COUNTS;
} else {
char *value;
value = strtok_r(NULL, ", \t\r\n", &save_ptr);
if (!value) {
ofp_fatal(str_, verbose, "field %s missing value", name);
}
if (!strcmp(name, "table")) {
fm->table_id = str_to_u8(value, name);
} else if (!strcmp(name, "out_port")) {
if (!ofputil_port_from_string(value, &fm->out_port)) {
ofp_fatal(str_, verbose, "%s is not a valid OpenFlow port",
name);
}
} else if (fields & F_PRIORITY && !strcmp(name, "priority")) {
fm->priority = str_to_u16(value, name);
} else if (fields & F_TIMEOUT && !strcmp(name, "idle_timeout")) {
fm->idle_timeout = str_to_u16(value, name);
} else if (fields & F_TIMEOUT && !strcmp(name, "hard_timeout")) {
fm->hard_timeout = str_to_u16(value, name);
} else if (!strcmp(name, "cookie")) {
char *mask = strchr(value, '/');
if (mask) {
/* A mask means we're searching for a cookie. */
if (command == OFPFC_ADD) {
ofp_fatal(str_, verbose, "flow additions cannot use "
"a cookie mask");
}
*mask = '\0';
fm->cookie = htonll(str_to_u64(value));
fm->cookie_mask = htonll(str_to_u64(mask+1));
} else {
/* No mask means that the cookie is being set. */
if (command != OFPFC_ADD && command != OFPFC_MODIFY
&& command != OFPFC_MODIFY_STRICT) {
ofp_fatal(str_, verbose, "cannot set cookie");
}
fm->new_cookie = htonll(str_to_u64(value));
}
} else if (mf_from_name(name)) {
parse_field(mf_from_name(name), value, &fm->match);
} else if (!strcmp(name, "duration")
|| !strcmp(name, "n_packets")
|| !strcmp(name, "n_bytes")
|| !strcmp(name, "idle_age")
|| !strcmp(name, "hard_age")) {
/* Ignore these, so that users can feed the output of
* "ovs-ofctl dump-flows" back into commands that parse
* flows. */
} else {
ofp_fatal(str_, verbose, "unknown keyword %s", name);
}
}
}
if (!fm->cookie_mask && fm->new_cookie == htonll(UINT64_MAX)
&& (command == OFPFC_MODIFY || command == OFPFC_MODIFY_STRICT)) {
/* On modifies without a mask, we are supposed to add a flow if
* one does not exist. If a cookie wasn't been specified, use a
* default of zero. */
fm->new_cookie = htonll(0);
}
if (fields & F_ACTIONS) {
struct ofpbuf ofpacts;
enum ofperr err;
ofpbuf_init(&ofpacts, 32);
str_to_inst_ofpacts(act_str, &ofpacts);
fm->ofpacts_len = ofpacts.size;
fm->ofpacts = ofpbuf_steal_data(&ofpacts);
err = ofpacts_check(fm->ofpacts, fm->ofpacts_len, &fm->match.flow,
OFPP_MAX, 0);
if (err) {
exit(EXIT_FAILURE);
}
} else {
fm->ofpacts_len = 0;
fm->ofpacts = NULL;
}
free(string);
}
/* Helper for bundle_parse and bundle_parse_load.
*
* 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
bundle_parse__(const char *s, char **save_ptr,
const char *fields, const char *basis, const char *algorithm,
const char *slave_type, const char *dst,
const char *slave_delim, struct ofpbuf *ofpacts)
{
struct ofpact_bundle *bundle;
if (!slave_delim) {
return xasprintf("%s: not enough arguments to bundle action", s);
}
if (strcasecmp(slave_delim, "slaves")) {
return xasprintf("%s: missing slave delimiter, expected `slaves' "
"got `%s'", s, slave_delim);
}
bundle = ofpact_put_BUNDLE(ofpacts);
for (;;) {
ofp_port_t slave_port;
char *slave;
slave = strtok_r(NULL, ", []", save_ptr);
if (!slave || bundle->n_slaves >= BUNDLE_MAX_SLAVES) {
break;
}
if (!ofputil_port_from_string(slave, &slave_port)) {
return xasprintf("%s: bad port number", slave);
}
ofpbuf_put(ofpacts, &slave_port, sizeof slave_port);
bundle = ofpacts->l2;
bundle->n_slaves++;
}
ofpact_update_len(ofpacts, &bundle->ofpact);
bundle->basis = atoi(basis);
if (!strcasecmp(fields, "eth_src")) {
bundle->fields = NX_HASH_FIELDS_ETH_SRC;
} else if (!strcasecmp(fields, "symmetric_l4")) {
bundle->fields = NX_HASH_FIELDS_SYMMETRIC_L4;
} else {
return xasprintf("%s: unknown fields `%s'", s, fields);
}
if (!strcasecmp(algorithm, "active_backup")) {
bundle->algorithm = NX_BD_ALG_ACTIVE_BACKUP;
} else if (!strcasecmp(algorithm, "hrw")) {
bundle->algorithm = NX_BD_ALG_HRW;
} else {
return xasprintf("%s: unknown algorithm `%s'", s, algorithm);
}
if (strcasecmp(slave_type, "ofport")) {
return xasprintf("%s: unknown slave_type `%s'", s, slave_type);
}
if (dst) {
char *error = mf_parse_subfield(&bundle->dst, dst);
if (error) {
return error;
}
}
return NULL;
}
