/
ofp-parse.c
1452 lines (1287 loc) · 46.5 KB
/
ofp-parse.c
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/*
* Copyright (c) 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "ofp-parse.h"
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include "bundle.h"
#include "byte-order.h"
#include "dynamic-string.h"
#include "learn.h"
#include "meta-flow.h"
#include "multipath.h"
#include "netdev.h"
#include "nx-match.h"
#include "ofp-actions.h"
#include "ofp-util.h"
#include "ofpbuf.h"
#include "openflow/openflow.h"
#include "ovs-thread.h"
#include "packets.h"
#include "simap.h"
#include "socket-util.h"
#include "vconn.h"
/* Parses 'str' as an 8-bit unsigned integer into '*valuep'.
*
* 'name' describes the value parsed in an error message, if any.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * WARN_UNUSED_RESULT
str_to_u8(const char *str, const char *name, uint8_t *valuep)
{
int value;
if (!str_to_int(str, 0, &value) || value < 0 || value > 255) {
return xasprintf("invalid %s \"%s\"", name, str);
}
*valuep = value;
return NULL;
}
/* Parses 'str' as a 16-bit unsigned integer into '*valuep'.
*
* 'name' describes the value parsed in an error message, if any.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * WARN_UNUSED_RESULT
str_to_u16(const char *str, const char *name, uint16_t *valuep)
{
int value;
if (!str_to_int(str, 0, &value) || value < 0 || value > 65535) {
return xasprintf("invalid %s \"%s\"", name, str);
}
*valuep = value;
return NULL;
}
/* Parses 'str' as a 32-bit unsigned integer into '*valuep'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * WARN_UNUSED_RESULT
str_to_u32(const char *str, uint32_t *valuep)
{
char *tail;
uint32_t value;
if (!str[0]) {
return xstrdup("missing required numeric argument");
}
errno = 0;
value = strtoul(str, &tail, 0);
if (errno == EINVAL || errno == ERANGE || *tail) {
return xasprintf("invalid numeric format %s", str);
}
*valuep = value;
return NULL;
}
/* Parses 'str' as an 64-bit unsigned integer into '*valuep'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * WARN_UNUSED_RESULT
str_to_u64(const char *str, uint64_t *valuep)
{
char *tail;
uint64_t value;
if (!str[0]) {
return xstrdup("missing required numeric argument");
}
errno = 0;
value = strtoull(str, &tail, 0);
if (errno == EINVAL || errno == ERANGE || *tail) {
return xasprintf("invalid numeric format %s", str);
}
*valuep = value;
return NULL;
}
/* Parses 'str' as an 64-bit unsigned integer in network byte order into
* '*valuep'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * WARN_UNUSED_RESULT
str_to_be64(const char *str, ovs_be64 *valuep)
{
uint64_t value = 0;
char *error;
error = str_to_u64(str, &value);
if (!error) {
*valuep = htonll(value);
}
return error;
}
/* Parses 'str' as an Ethernet address into 'mac'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * WARN_UNUSED_RESULT
str_to_mac(const char *str, uint8_t mac[ETH_ADDR_LEN])
{
if (!ovs_scan(str, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac))) {
return xasprintf("invalid mac address %s", str);
}
return NULL;
}
/* Parses 'str' as an IP address into '*ip'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * WARN_UNUSED_RESULT
str_to_ip(const char *str, ovs_be32 *ip)
{
struct in_addr in_addr;
if (lookup_ip(str, &in_addr)) {
return xasprintf("%s: could not convert to IP address", str);
}
*ip = in_addr.s_addr;
return NULL;
}
struct protocol {
const char *name;
uint16_t dl_type;
uint8_t nw_proto;
};
static bool
parse_protocol(const char *name, const struct protocol **p_out)
{
static const struct protocol protocols[] = {
{ "ip", ETH_TYPE_IP, 0 },
{ "arp", ETH_TYPE_ARP, 0 },
{ "icmp", ETH_TYPE_IP, IPPROTO_ICMP },
{ "tcp", ETH_TYPE_IP, IPPROTO_TCP },
{ "udp", ETH_TYPE_IP, IPPROTO_UDP },
{ "sctp", ETH_TYPE_IP, IPPROTO_SCTP },
{ "ipv6", ETH_TYPE_IPV6, 0 },
{ "ip6", ETH_TYPE_IPV6, 0 },
{ "icmp6", ETH_TYPE_IPV6, IPPROTO_ICMPV6 },
{ "tcp6", ETH_TYPE_IPV6, IPPROTO_TCP },
{ "udp6", ETH_TYPE_IPV6, IPPROTO_UDP },
{ "sctp6", ETH_TYPE_IPV6, IPPROTO_SCTP },
{ "rarp", ETH_TYPE_RARP, 0},
{ "mpls", ETH_TYPE_MPLS, 0 },
{ "mplsm", ETH_TYPE_MPLS_MCAST, 0 },
};
const struct protocol *p;
for (p = protocols; p < &protocols[ARRAY_SIZE(protocols)]; p++) {
if (!strcmp(p->name, name)) {
*p_out = p;
return true;
}
}
*p_out = NULL;
return false;
}
/* Parses 's' as the (possibly masked) value of field 'mf', and updates
* 'match' appropriately. Restricts the set of usable protocols to ones
* supporting the parsed field.
*
* 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
parse_field(const struct mf_field *mf, const char *s, struct match *match,
enum ofputil_protocol *usable_protocols)
{
union mf_value value, mask;
char *error;
error = mf_parse(mf, s, &value, &mask);
if (!error) {
*usable_protocols &= mf_set(mf, &value, &mask, match);
}
return error;
}
static char *
extract_actions(char *s)
{
s = strstr(s, "action");
if (s) {
*s = '\0';
s = strchr(s + 1, '=');
return s ? s + 1 : NULL;
} else {
return NULL;
}
}
static char * WARN_UNUSED_RESULT
parse_ofp_str__(struct ofputil_flow_mod *fm, int command, char *string,
enum ofputil_protocol *usable_protocols)
{
enum {
F_OUT_PORT = 1 << 0,
F_ACTIONS = 1 << 1,
F_IMPORTANCE = 1 << 2,
F_TIMEOUT = 1 << 3,
F_PRIORITY = 1 << 4,
F_FLAGS = 1 << 5,
} fields;
char *save_ptr = NULL;
char *act_str = NULL;
char *name;
*usable_protocols = OFPUTIL_P_ANY;
switch (command) {
case -1:
fields = F_OUT_PORT;
break;
case OFPFC_ADD:
fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS | F_IMPORTANCE;
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:
OVS_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 = OVS_BE64_MAX;
} else{
fm->new_cookie = htonll(0);
}
fm->modify_cookie = false;
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;
fm->importance = 0;
fm->out_group = OFPG11_ANY;
fm->delete_reason = OFPRR_DELETE;
if (fields & F_ACTIONS) {
act_str = extract_actions(string);
if (!act_str) {
return xstrdup("must specify an action");
}
}
for (name = strtok_r(string, "=, \t\r\n", &save_ptr); name;
name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
const struct protocol *p;
char *error = NULL;
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 |= OFPUTIL_FF_SEND_FLOW_REM;
} else if (fields & F_FLAGS && !strcmp(name, "check_overlap")) {
fm->flags |= OFPUTIL_FF_CHECK_OVERLAP;
} else if (fields & F_FLAGS && !strcmp(name, "reset_counts")) {
fm->flags |= OFPUTIL_FF_RESET_COUNTS;
*usable_protocols &= OFPUTIL_P_OF12_UP;
} else if (fields & F_FLAGS && !strcmp(name, "no_packet_counts")) {
fm->flags |= OFPUTIL_FF_NO_PKT_COUNTS;
*usable_protocols &= OFPUTIL_P_OF13_UP;
} else if (fields & F_FLAGS && !strcmp(name, "no_byte_counts")) {
fm->flags |= OFPUTIL_FF_NO_BYT_COUNTS;
*usable_protocols &= OFPUTIL_P_OF13_UP;
} else if (!strcmp(name, "no_readonly_table")
|| !strcmp(name, "allow_hidden_fields")) {
/* ignore these fields. */
} else {
char *value;
value = strtok_r(NULL, ", \t\r\n", &save_ptr);
if (!value) {
return xasprintf("field %s missing value", name);
}
if (!strcmp(name, "table")) {
error = str_to_u8(value, "table", &fm->table_id);
if (fm->table_id != 0xff) {
*usable_protocols &= OFPUTIL_P_TID;
}
} else if (!strcmp(name, "out_port")) {
if (!ofputil_port_from_string(value, &fm->out_port)) {
error = xasprintf("%s is not a valid OpenFlow port",
value);
}
} else if (fields & F_PRIORITY && !strcmp(name, "priority")) {
uint16_t priority = 0;
error = str_to_u16(value, name, &priority);
fm->priority = priority;
} else if (fields & F_TIMEOUT && !strcmp(name, "idle_timeout")) {
error = str_to_u16(value, name, &fm->idle_timeout);
} else if (fields & F_TIMEOUT && !strcmp(name, "hard_timeout")) {
error = str_to_u16(value, name, &fm->hard_timeout);
} else if (fields & F_IMPORTANCE && !strcmp(name, "importance")) {
error = str_to_u16(value, name, &fm->importance);
} else if (!strcmp(name, "cookie")) {
char *mask = strchr(value, '/');
if (mask) {
/* A mask means we're searching for a cookie. */
if (command == OFPFC_ADD) {
return xstrdup("flow additions cannot use "
"a cookie mask");
}
*mask = '\0';
error = str_to_be64(value, &fm->cookie);
if (error) {
return error;
}
error = str_to_be64(mask + 1, &fm->cookie_mask);
/* Matching of the cookie is only supported through NXM or
* OF1.1+. */
if (fm->cookie_mask != htonll(0)) {
*usable_protocols &= OFPUTIL_P_NXM_OF11_UP;
}
} else {
/* No mask means that the cookie is being set. */
if (command != OFPFC_ADD && command != OFPFC_MODIFY
&& command != OFPFC_MODIFY_STRICT) {
return xstrdup("cannot set cookie");
}
error = str_to_be64(value, &fm->new_cookie);
fm->modify_cookie = true;
}
} else if (mf_from_name(name)) {
error = parse_field(mf_from_name(name), value, &fm->match,
usable_protocols);
} 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 {
error = xasprintf("unknown keyword %s", name);
}
if (error) {
return error;
}
}
}
/* Check for usable protocol interdependencies between match fields. */
if (fm->match.flow.dl_type == htons(ETH_TYPE_IPV6)) {
const struct flow_wildcards *wc = &fm->match.wc;
/* Only NXM and OXM support matching L3 and L4 fields within IPv6.
*
* (IPv6 specific fields as well as arp_sha, arp_tha, nw_frag, and
* nw_ttl are covered elsewhere so they don't need to be included in
* this test too.)
*/
if (wc->masks.nw_proto || wc->masks.nw_tos
|| wc->masks.tp_src || wc->masks.tp_dst) {
*usable_protocols &= OFPUTIL_P_NXM_OXM_ANY;
}
}
if (!fm->cookie_mask && fm->new_cookie == OVS_BE64_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) {
enum ofputil_protocol action_usable_protocols;
struct ofpbuf ofpacts;
char *error;
ofpbuf_init(&ofpacts, 32);
error = ofpacts_parse_instructions(act_str, &ofpacts,
&action_usable_protocols);
*usable_protocols &= action_usable_protocols;
if (!error) {
enum ofperr err;
err = ofpacts_check(ofpbuf_data(&ofpacts), ofpbuf_size(&ofpacts), &fm->match.flow,
OFPP_MAX, fm->table_id, 255, usable_protocols);
if (!err && !usable_protocols) {
err = OFPERR_OFPBAC_MATCH_INCONSISTENT;
}
if (err) {
error = xasprintf("actions are invalid with specified match "
"(%s)", ofperr_to_string(err));
}
}
if (error) {
ofpbuf_uninit(&ofpacts);
return error;
}
fm->ofpacts_len = ofpbuf_size(&ofpacts);
fm->ofpacts = ofpbuf_steal_data(&ofpacts);
} else {
fm->ofpacts_len = 0;
fm->ofpacts = NULL;
}
return NULL;
}
/* 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.
* Returns the set of usable protocols in '*usable_protocols'.
*
* 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'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * WARN_UNUSED_RESULT
parse_ofp_str(struct ofputil_flow_mod *fm, int command, const char *str_,
enum ofputil_protocol *usable_protocols)
{
char *string = xstrdup(str_);
char *error;
error = parse_ofp_str__(fm, command, string, usable_protocols);
if (error) {
fm->ofpacts = NULL;
fm->ofpacts_len = 0;
}
free(string);
return error;
}
static char * WARN_UNUSED_RESULT
parse_ofp_meter_mod_str__(struct ofputil_meter_mod *mm, char *string,
struct ofpbuf *bands, int command,
enum ofputil_protocol *usable_protocols)
{
enum {
F_METER = 1 << 0,
F_FLAGS = 1 << 1,
F_BANDS = 1 << 2,
} fields;
char *save_ptr = NULL;
char *band_str = NULL;
char *name;
/* Meters require at least OF 1.3. */
*usable_protocols = OFPUTIL_P_OF13_UP;
switch (command) {
case -1:
fields = F_METER;
break;
case OFPMC13_ADD:
fields = F_METER | F_FLAGS | F_BANDS;
break;
case OFPMC13_DELETE:
fields = F_METER;
break;
case OFPMC13_MODIFY:
fields = F_METER | F_FLAGS | F_BANDS;
break;
default:
OVS_NOT_REACHED();
}
mm->command = command;
mm->meter.meter_id = 0;
mm->meter.flags = 0;
if (fields & F_BANDS) {
band_str = strstr(string, "band");
if (!band_str) {
return xstrdup("must specify bands");
}
*band_str = '\0';
band_str = strchr(band_str + 1, '=');
if (!band_str) {
return xstrdup("must specify bands");
}
band_str++;
}
for (name = strtok_r(string, "=, \t\r\n", &save_ptr); name;
name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
if (fields & F_FLAGS && !strcmp(name, "kbps")) {
mm->meter.flags |= OFPMF13_KBPS;
} else if (fields & F_FLAGS && !strcmp(name, "pktps")) {
mm->meter.flags |= OFPMF13_PKTPS;
} else if (fields & F_FLAGS && !strcmp(name, "burst")) {
mm->meter.flags |= OFPMF13_BURST;
} else if (fields & F_FLAGS && !strcmp(name, "stats")) {
mm->meter.flags |= OFPMF13_STATS;
} else {
char *value;
value = strtok_r(NULL, ", \t\r\n", &save_ptr);
if (!value) {
return xasprintf("field %s missing value", name);
}
if (!strcmp(name, "meter")) {
if (!strcmp(value, "all")) {
mm->meter.meter_id = OFPM13_ALL;
} else if (!strcmp(value, "controller")) {
mm->meter.meter_id = OFPM13_CONTROLLER;
} else if (!strcmp(value, "slowpath")) {
mm->meter.meter_id = OFPM13_SLOWPATH;
} else {
char *error = str_to_u32(value, &mm->meter.meter_id);
if (error) {
return error;
}
if (mm->meter.meter_id > OFPM13_MAX
|| !mm->meter.meter_id) {
return xasprintf("invalid value for %s", name);
}
}
} else {
return xasprintf("unknown keyword %s", name);
}
}
}
if (fields & F_METER && !mm->meter.meter_id) {
return xstrdup("must specify 'meter'");
}
if (fields & F_FLAGS && !mm->meter.flags) {
return xstrdup("meter must specify either 'kbps' or 'pktps'");
}
if (fields & F_BANDS) {
uint16_t n_bands = 0;
struct ofputil_meter_band *band = NULL;
int i;
for (name = strtok_r(band_str, "=, \t\r\n", &save_ptr); name;
name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
char *value;
value = strtok_r(NULL, ", \t\r\n", &save_ptr);
if (!value) {
return xasprintf("field %s missing value", name);
}
if (!strcmp(name, "type")) {
/* Start a new band */
band = ofpbuf_put_zeros(bands, sizeof *band);
n_bands++;
if (!strcmp(value, "drop")) {
band->type = OFPMBT13_DROP;
} else if (!strcmp(value, "dscp_remark")) {
band->type = OFPMBT13_DSCP_REMARK;
} else {
return xasprintf("field %s unknown value %s", name, value);
}
} else if (!band || !band->type) {
return xstrdup("band must start with the 'type' keyword");
} else if (!strcmp(name, "rate")) {
char *error = str_to_u32(value, &band->rate);
if (error) {
return error;
}
} else if (!strcmp(name, "burst_size")) {
char *error = str_to_u32(value, &band->burst_size);
if (error) {
return error;
}
} else if (!strcmp(name, "prec_level")) {
char *error = str_to_u8(value, name, &band->prec_level);
if (error) {
return error;
}
} else {
return xasprintf("unknown keyword %s", name);
}
}
/* validate bands */
if (!n_bands) {
return xstrdup("meter must have bands");
}
mm->meter.n_bands = n_bands;
mm->meter.bands = ofpbuf_steal_data(bands);
for (i = 0; i < n_bands; ++i) {
band = &mm->meter.bands[i];
if (!band->type) {
return xstrdup("band must have 'type'");
}
if (band->type == OFPMBT13_DSCP_REMARK) {
if (!band->prec_level) {
return xstrdup("'dscp_remark' band must have"
" 'prec_level'");
}
} else {
if (band->prec_level) {
return xstrdup("Only 'dscp_remark' band may have"
" 'prec_level'");
}
}
if (!band->rate) {
return xstrdup("band must have 'rate'");
}
if (mm->meter.flags & OFPMF13_BURST) {
if (!band->burst_size) {
return xstrdup("band must have 'burst_size' "
"when 'burst' flag is set");
}
} else {
if (band->burst_size) {
return xstrdup("band may have 'burst_size' only "
"when 'burst' flag is set");
}
}
}
} else {
mm->meter.n_bands = 0;
mm->meter.bands = NULL;
}
return NULL;
}
/* Convert 'str_' (as described in the Flow Syntax section of the ovs-ofctl man
* page) into 'mm' for sending the specified meter_mod 'command' to a switch.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * WARN_UNUSED_RESULT
parse_ofp_meter_mod_str(struct ofputil_meter_mod *mm, const char *str_,
int command, enum ofputil_protocol *usable_protocols)
{
struct ofpbuf bands;
char *string;
char *error;
ofpbuf_init(&bands, 64);
string = xstrdup(str_);
error = parse_ofp_meter_mod_str__(mm, string, &bands, command,
usable_protocols);
free(string);
ofpbuf_uninit(&bands);
return error;
}
static char * WARN_UNUSED_RESULT
parse_flow_monitor_request__(struct ofputil_flow_monitor_request *fmr,
const char *str_, char *string,
enum ofputil_protocol *usable_protocols)
{
static atomic_count id = ATOMIC_COUNT_INIT(0);
char *save_ptr = NULL;
char *name;
fmr->id = atomic_count_inc(&id);
fmr->flags = (NXFMF_INITIAL | NXFMF_ADD | NXFMF_DELETE | NXFMF_MODIFY
| NXFMF_OWN | NXFMF_ACTIONS);
fmr->out_port = OFPP_NONE;
fmr->table_id = 0xff;
match_init_catchall(&fmr->match);
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 (!strcmp(name, "!initial")) {
fmr->flags &= ~NXFMF_INITIAL;
} else if (!strcmp(name, "!add")) {
fmr->flags &= ~NXFMF_ADD;
} else if (!strcmp(name, "!delete")) {
fmr->flags &= ~NXFMF_DELETE;
} else if (!strcmp(name, "!modify")) {
fmr->flags &= ~NXFMF_MODIFY;
} else if (!strcmp(name, "!actions")) {
fmr->flags &= ~NXFMF_ACTIONS;
} else if (!strcmp(name, "!own")) {
fmr->flags &= ~NXFMF_OWN;
} else if (parse_protocol(name, &p)) {
match_set_dl_type(&fmr->match, htons(p->dl_type));
if (p->nw_proto) {
match_set_nw_proto(&fmr->match, p->nw_proto);
}
} else {
char *value;
value = strtok_r(NULL, ", \t\r\n", &save_ptr);
if (!value) {
return xasprintf("%s: field %s missing value", str_, name);
}
if (!strcmp(name, "table")) {
char *error = str_to_u8(value, "table", &fmr->table_id);
if (error) {
return error;
}
} else if (!strcmp(name, "out_port")) {
fmr->out_port = u16_to_ofp(atoi(value));
} else if (mf_from_name(name)) {
char *error;
error = parse_field(mf_from_name(name), value, &fmr->match,
usable_protocols);
if (error) {
return error;
}
} else {
return xasprintf("%s: unknown keyword %s", str_, name);
}
}
}
return NULL;
}
/* Convert 'str_' (as described in the documentation for the "monitor" command
* in the ovs-ofctl man page) into 'fmr'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * WARN_UNUSED_RESULT
parse_flow_monitor_request(struct ofputil_flow_monitor_request *fmr,
const char *str_,
enum ofputil_protocol *usable_protocols)
{
char *string = xstrdup(str_);
char *error = parse_flow_monitor_request__(fmr, str_, string,
usable_protocols);
free(string);
return error;
}
/* Parses 'string' as an OFPT_FLOW_MOD or NXT_FLOW_MOD with command 'command'
* (one of OFPFC_*) into 'fm'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * WARN_UNUSED_RESULT
parse_ofp_flow_mod_str(struct ofputil_flow_mod *fm, const char *string,
uint16_t command,
enum ofputil_protocol *usable_protocols)
{
char *error = parse_ofp_str(fm, command, string, usable_protocols);
if (!error) {
/* Normalize a copy of the match. This ensures that non-normalized
* flows get logged but doesn't affect what gets sent to the switch, so
* that the switch can do whatever it likes with the flow. */
struct match match_copy = fm->match;
ofputil_normalize_match(&match_copy);
}
return error;
}
/* Convert 'table_id' and 'flow_miss_handling' (as described for the
* "mod-table" command in the ovs-ofctl man page) into 'tm' for sending the
* specified table_mod 'command' to a switch.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * WARN_UNUSED_RESULT
parse_ofp_table_mod(struct ofputil_table_mod *tm, const char *table_id,
const char *flow_miss_handling,
enum ofputil_protocol *usable_protocols)
{
/* Table mod requires at least OF 1.1. */
*usable_protocols = OFPUTIL_P_OF11_UP;
if (!strcasecmp(table_id, "all")) {
tm->table_id = OFPTT_ALL;
} else {
char *error = str_to_u8(table_id, "table_id", &tm->table_id);
if (error) {
return error;
}
}
if (strcmp(flow_miss_handling, "controller") == 0) {
tm->miss_config = OFPUTIL_TABLE_MISS_CONTROLLER;
} else if (strcmp(flow_miss_handling, "continue") == 0) {
tm->miss_config = OFPUTIL_TABLE_MISS_CONTINUE;
} else if (strcmp(flow_miss_handling, "drop") == 0) {
tm->miss_config = OFPUTIL_TABLE_MISS_DROP;
} else {
return xasprintf("invalid flow_miss_handling %s", flow_miss_handling);
}
if (tm->table_id == 0xfe
&& tm->miss_config == OFPUTIL_TABLE_MISS_CONTINUE) {
return xstrdup("last table's flow miss handling can not be continue");
}
return NULL;
}
/* Opens file 'file_name' and reads each line as a flow_mod of the specified
* type (one of OFPFC_*). Stores each flow_mod in '*fm', an array allocated
* on the caller's behalf, and the number of flow_mods in '*n_fms'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * WARN_UNUSED_RESULT
parse_ofp_flow_mod_file(const char *file_name, uint16_t command,
struct ofputil_flow_mod **fms, size_t *n_fms,
enum ofputil_protocol *usable_protocols)
{
size_t allocated_fms;
int line_number;
FILE *stream;
struct ds s;
*usable_protocols = OFPUTIL_P_ANY;
*fms = NULL;
*n_fms = 0;
stream = !strcmp(file_name, "-") ? stdin : fopen(file_name, "r");
if (stream == NULL) {
return xasprintf("%s: open failed (%s)",
file_name, ovs_strerror(errno));
}
allocated_fms = *n_fms;
ds_init(&s);
line_number = 0;
while (!ds_get_preprocessed_line(&s, stream, &line_number)) {
char *error;
enum ofputil_protocol usable;
if (*n_fms >= allocated_fms) {
*fms = x2nrealloc(*fms, &allocated_fms, sizeof **fms);
}
error = parse_ofp_flow_mod_str(&(*fms)[*n_fms], ds_cstr(&s), command,
&usable);
if (error) {
size_t i;
for (i = 0; i < *n_fms; i++) {
free(CONST_CAST(struct ofpact *, (*fms)[i].ofpacts));
}
free(*fms);
*fms = NULL;
*n_fms = 0;
ds_destroy(&s);
if (stream != stdin) {
fclose(stream);
}
return xasprintf("%s:%d: %s", file_name, line_number, error);
}
*usable_protocols &= usable; /* Each line can narrow the set. */
*n_fms += 1;
}
ds_destroy(&s);
if (stream != stdin) {
fclose(stream);
}
return NULL;
}
char * WARN_UNUSED_RESULT
parse_ofp_flow_stats_request_str(struct ofputil_flow_stats_request *fsr,
bool aggregate, const char *string,
enum ofputil_protocol *usable_protocols)
{
struct ofputil_flow_mod fm;
char *error;
error = parse_ofp_str(&fm, -1, string, usable_protocols);
if (error) {
return error;
}
/* Special table ID support not required for stats requests. */
if (*usable_protocols & OFPUTIL_P_OF10_STD_TID) {
*usable_protocols |= OFPUTIL_P_OF10_STD;
}
if (*usable_protocols & OFPUTIL_P_OF10_NXM_TID) {
*usable_protocols |= OFPUTIL_P_OF10_NXM;
}
fsr->aggregate = aggregate;
fsr->cookie = fm.cookie;
fsr->cookie_mask = fm.cookie_mask;
fsr->match = fm.match;
fsr->out_port = fm.out_port;
fsr->out_group = fm.out_group;
fsr->table_id = fm.table_id;
return NULL;
}
/* Parses a specification of a flow from 's' into 'flow'. 's' must take the
* form FIELD=VALUE[,FIELD=VALUE]... where each FIELD is the name of a
* mf_field. Fields must be specified in a natural order for satisfying
* prerequisites. If 'mask' is specified, fills the mask field for each of the
* field specified in flow. If the map, 'names_portno' is specfied, converts
* the in_port name into port no while setting the 'flow'.
*
* Returns NULL on success, otherwise a malloc()'d string that explains the
* problem. */
char *
parse_ofp_exact_flow(struct flow *flow, struct flow *mask, const char *s,
const struct simap *portno_names)
{
char *pos, *key, *value_s;
char *error = NULL;
char *copy;
memset(flow, 0, sizeof *flow);
if (mask) {
memset(mask, 0, sizeof *mask);