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openvswitch/lib/ofp-flow.c
SatyaValli c7b02b8006 Add support for OpenFlow 1.5 statistics (OXS). 
This patch provides implementation Existing flow entry statistics are
redefined as standard OXS(OpenFlow Extensible Statistics) fields for
displaying the arbitrary flow stats.

To support this implementation below messages are newly added

OFPRAW_OFPT15_FLOW_REMOVED,
OFPRAW_OFPST15_AGGREGATE_REQUEST,
OFPRAW_OFPST15_FLOW_REPLY,
OFPRAW_OFPST15_AGGREGATE_REPLY,

The current commit adds support for the new feature in flow statistics
multipart messages, aggregate multipart messages and OXS support for flow
removal message, individual flow description messages.

Signed-off-by: Satya Valli <satyavalli.rama@tcs.com>
Co-authored-by: Lavanya Harivelam <harivelam.lavanya@tcs.com>
Signed-off-by: Lavanya Harivelam <harivelam.lavanya@tcs.com>
Co-authored-by: Surya Muttamsetty <muttamsetty.surya@tcs.com>
Signed-off-by: Surya Muttamsetty <muttamsetty.surya@tcs.com>
Co-authored-by: Manasa Cherukupally <manasa.cherukupally@tcs.com>
Signed-off-by: Manasa Cherukupally <manasa.cherukupally@tcs.com>
Co-authored-by: Pavani Panthagada <p.pavani1@tcs.com>
Signed-off-by: Pavani Panthagada <p.pavani1@tcs.com>
[blp@ovn.org simplified and rewrote much of the code]
Co-authored-by: Ben Pfaff <blp@ovn.org>
Signed-off-by: Ben Pfaff <blp@ovn.org>
2018-05-16 15:29:46 -07:00

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/*
* Copyright (c) 2008-2017 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 "openvswitch/ofp-flow.h"
#include <errno.h>
#include "byte-order.h"
#include "colors.h"
#include "flow.h"
#include "nx-match.h"
#include "openvswitch/ofp-actions.h"
#include "openvswitch/ofp-group.h"
#include "openvswitch/ofp-match.h"
#include "openvswitch/ofp-msgs.h"
#include "openvswitch/ofp-parse.h"
#include "openvswitch/ofp-port.h"
#include "openvswitch/ofp-print.h"
#include "openvswitch/ofp-table.h"
#include "openvswitch/ofpbuf.h"
#include "openvswitch/vlog.h"
#include "util.h"
#include "ox-stat.h"
VLOG_DEFINE_THIS_MODULE(ofp_flow);
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
struct ofputil_flow_mod_flag {
uint16_t raw_flag;
enum ofp_version min_version, max_version;
enum ofputil_flow_mod_flags flag;
};
static const struct ofputil_flow_mod_flag ofputil_flow_mod_flags[] = {
{ OFPFF_SEND_FLOW_REM, OFP10_VERSION, 0, OFPUTIL_FF_SEND_FLOW_REM },
{ OFPFF_CHECK_OVERLAP, OFP10_VERSION, 0, OFPUTIL_FF_CHECK_OVERLAP },
{ OFPFF10_EMERG, OFP10_VERSION, OFP10_VERSION,
OFPUTIL_FF_EMERG },
{ OFPFF12_RESET_COUNTS, OFP12_VERSION, 0, OFPUTIL_FF_RESET_COUNTS },
{ OFPFF13_NO_PKT_COUNTS, OFP13_VERSION, 0, OFPUTIL_FF_NO_PKT_COUNTS },
{ OFPFF13_NO_BYT_COUNTS, OFP13_VERSION, 0, OFPUTIL_FF_NO_BYT_COUNTS },
{ 0, 0, 0, 0 },
};
static enum ofperr
ofputil_decode_flow_mod_flags(ovs_be16 raw_flags_,
enum ofp_flow_mod_command command,
enum ofp_version version,
enum ofputil_flow_mod_flags *flagsp)
{
uint16_t raw_flags = ntohs(raw_flags_);
const struct ofputil_flow_mod_flag *f;
*flagsp = 0;
for (f = ofputil_flow_mod_flags; f->raw_flag; f++) {
if (raw_flags & f->raw_flag
&& version >= f->min_version
&& (!f->max_version || version <= f->max_version)) {
raw_flags &= ~f->raw_flag;
*flagsp |= f->flag;
}
}
/* In OF1.0 and OF1.1, "add" always resets counters, and other commands
* never do.
*
* In OF1.2 and later, OFPFF12_RESET_COUNTS controls whether each command
* resets counters. */
if ((version == OFP10_VERSION || version == OFP11_VERSION)
&& command == OFPFC_ADD) {
*flagsp |= OFPUTIL_FF_RESET_COUNTS;
}
return raw_flags ? OFPERR_OFPFMFC_BAD_FLAGS : 0;
}
static ovs_be16
ofputil_encode_flow_mod_flags(enum ofputil_flow_mod_flags flags,
enum ofp_version version)
{
const struct ofputil_flow_mod_flag *f;
uint16_t raw_flags;
raw_flags = 0;
for (f = ofputil_flow_mod_flags; f->raw_flag; f++) {
if (f->flag & flags
&& version >= f->min_version
&& (!f->max_version || version <= f->max_version)) {
raw_flags |= f->raw_flag;
}
}
return htons(raw_flags);
}
void
ofputil_flow_mod_flags_format(struct ds *s, enum ofputil_flow_mod_flags flags)
{
if (flags & OFPUTIL_FF_SEND_FLOW_REM) {
ds_put_cstr(s, "send_flow_rem ");
}
if (flags & OFPUTIL_FF_CHECK_OVERLAP) {
ds_put_cstr(s, "check_overlap ");
}
if (flags & OFPUTIL_FF_RESET_COUNTS) {
ds_put_cstr(s, "reset_counts ");
}
if (flags & OFPUTIL_FF_NO_PKT_COUNTS) {
ds_put_cstr(s, "no_packet_counts ");
}
if (flags & OFPUTIL_FF_NO_BYT_COUNTS) {
ds_put_cstr(s, "no_byte_counts ");
}
if (flags & OFPUTIL_FF_HIDDEN_FIELDS) {
ds_put_cstr(s, "allow_hidden_fields ");
}
if (flags & OFPUTIL_FF_NO_READONLY) {
ds_put_cstr(s, "no_readonly_table ");
}
}
/* Converts an OFPT_FLOW_MOD or NXT_FLOW_MOD message 'oh' into an abstract
* flow_mod in 'fm'. Returns 0 if successful, otherwise an OpenFlow error
* code.
*
* Uses 'ofpacts' to store the abstract OFPACT_* version of 'oh''s actions.
* The caller must initialize 'ofpacts' and retains ownership of it.
* 'fm->ofpacts' will point into the 'ofpacts' buffer.
*
* On success, the caller must eventually destroy fm->match.
*
* Does not validate the flow_mod actions. The caller should do that, with
* ofpacts_check(). */
enum ofperr
ofputil_decode_flow_mod(struct ofputil_flow_mod *fm,
const struct ofp_header *oh,
enum ofputil_protocol protocol,
const struct tun_table *tun_table,
const struct vl_mff_map *vl_mff_map,
struct ofpbuf *ofpacts,
ofp_port_t max_port, uint8_t max_table)
{
ovs_be16 raw_flags;
enum ofperr error;
struct match match;
struct ofpbuf b = ofpbuf_const_initializer(oh, ntohs(oh->length));
enum ofpraw raw = ofpraw_pull_assert(&b);
if (raw == OFPRAW_OFPT11_FLOW_MOD) {
/* Standard OpenFlow 1.1+ flow_mod. */
const struct ofp11_flow_mod *ofm;
ofm = ofpbuf_pull(&b, sizeof *ofm);
error = ofputil_pull_ofp11_match(&b, tun_table, vl_mff_map, &match,
NULL);
if (error) {
return error;
}
/* Translate the message. */
fm->priority = ntohs(ofm->priority);
if (ofm->command == OFPFC_ADD
|| (oh->version == OFP11_VERSION
&& (ofm->command == OFPFC_MODIFY ||
ofm->command == OFPFC_MODIFY_STRICT)
&& ofm->cookie_mask == htonll(0))) {
/* In OpenFlow 1.1 only, a "modify" or "modify-strict" that does
* not match on the cookie is treated as an "add" if there is no
* match. */
fm->cookie = htonll(0);
fm->cookie_mask = htonll(0);
fm->new_cookie = ofm->cookie;
} else {
fm->cookie = ofm->cookie;
fm->cookie_mask = ofm->cookie_mask;
fm->new_cookie = OVS_BE64_MAX;
}
fm->modify_cookie = false;
fm->command = ofm->command;
/* Get table ID.
*
* OF1.1 entirely forbids table_id == OFPTT_ALL.
* OF1.2+ allows table_id == OFPTT_ALL only for deletes. */
fm->table_id = ofm->table_id;
if (fm->table_id == OFPTT_ALL
&& (oh->version == OFP11_VERSION
|| (ofm->command != OFPFC_DELETE &&
ofm->command != OFPFC_DELETE_STRICT))) {
return OFPERR_OFPFMFC_BAD_TABLE_ID;
}
fm->idle_timeout = ntohs(ofm->idle_timeout);
fm->hard_timeout = ntohs(ofm->hard_timeout);
if (oh->version >= OFP14_VERSION && ofm->command == OFPFC_ADD) {
fm->importance = ntohs(ofm->importance);
} else {
fm->importance = 0;
}
fm->buffer_id = ntohl(ofm->buffer_id);
error = ofputil_port_from_ofp11(ofm->out_port, &fm->out_port);
if (error) {
return error;
}
fm->out_group = (ofm->command == OFPFC_DELETE ||
ofm->command == OFPFC_DELETE_STRICT
? ntohl(ofm->out_group)
: OFPG_ANY);
raw_flags = ofm->flags;
} else {
uint16_t command;
if (raw == OFPRAW_OFPT10_FLOW_MOD) {
/* Standard OpenFlow 1.0 flow_mod. */
const struct ofp10_flow_mod *ofm;
/* Get the ofp10_flow_mod. */
ofm = ofpbuf_pull(&b, sizeof *ofm);
/* Translate the rule. */
ofputil_match_from_ofp10_match(&ofm->match, &match);
ofputil_normalize_match(&match);
/* OpenFlow 1.0 says that exact-match rules have to have the
* highest possible priority. */
fm->priority = (ofm->match.wildcards & htonl(OFPFW10_ALL)
? ntohs(ofm->priority)
: UINT16_MAX);
/* Translate the message. */
command = ntohs(ofm->command);
fm->cookie = htonll(0);
fm->cookie_mask = htonll(0);
fm->new_cookie = ofm->cookie;
fm->idle_timeout = ntohs(ofm->idle_timeout);
fm->hard_timeout = ntohs(ofm->hard_timeout);
fm->importance = 0;
fm->buffer_id = ntohl(ofm->buffer_id);
fm->out_port = u16_to_ofp(ntohs(ofm->out_port));
fm->out_group = OFPG_ANY;
raw_flags = ofm->flags;
} else if (raw == OFPRAW_NXT_FLOW_MOD) {
/* Nicira extended flow_mod. */
const struct nx_flow_mod *nfm;
/* Dissect the message. */
nfm = ofpbuf_pull(&b, sizeof *nfm);
error = nx_pull_match(&b, ntohs(nfm->match_len),
&match, &fm->cookie, &fm->cookie_mask,
false, tun_table, vl_mff_map);
if (error) {
return error;
}
/* Translate the message. */
command = ntohs(nfm->command);
if ((command & 0xff) == OFPFC_ADD && fm->cookie_mask) {
/* Flow additions may only set a new cookie, not match an
* existing cookie. */
return OFPERR_NXBRC_NXM_INVALID;
}
fm->priority = ntohs(nfm->priority);
fm->new_cookie = nfm->cookie;
fm->idle_timeout = ntohs(nfm->idle_timeout);
fm->hard_timeout = ntohs(nfm->hard_timeout);
fm->importance = 0;
fm->buffer_id = ntohl(nfm->buffer_id);
fm->out_port = u16_to_ofp(ntohs(nfm->out_port));
fm->out_group = OFPG_ANY;
raw_flags = nfm->flags;
} else {
OVS_NOT_REACHED();
}
fm->modify_cookie = fm->new_cookie != OVS_BE64_MAX;
if (protocol & OFPUTIL_P_TID) {
fm->command = command & 0xff;
fm->table_id = command >> 8;
} else {
if (command > 0xff) {
VLOG_WARN_RL(&rl, "flow_mod has explicit table_id "
"but flow_mod_table_id extension is not enabled");
}
fm->command = command;
fm->table_id = 0xff;
}
}
/* Check for mismatched conntrack original direction tuple address fields
* w.r.t. the IP version of the match. */
if (((match.wc.masks.ct_nw_src || match.wc.masks.ct_nw_dst)
&& match.flow.dl_type != htons(ETH_TYPE_IP))
|| ((ipv6_addr_is_set(&match.wc.masks.ct_ipv6_src)
|| ipv6_addr_is_set(&match.wc.masks.ct_ipv6_dst))
&& match.flow.dl_type != htons(ETH_TYPE_IPV6))) {
return OFPERR_OFPBAC_MATCH_INCONSISTENT;
}
if (fm->command > OFPFC_DELETE_STRICT) {
return OFPERR_OFPFMFC_BAD_COMMAND;
}
fm->ofpacts_tlv_bitmap = 0;
error = ofpacts_pull_openflow_instructions(&b, b.size, oh->version,
vl_mff_map,
&fm->ofpacts_tlv_bitmap,
ofpacts);
if (error) {
return error;
}
fm->ofpacts = ofpacts->data;
fm->ofpacts_len = ofpacts->size;
error = ofputil_decode_flow_mod_flags(raw_flags, fm->command,
oh->version, &fm->flags);
if (error) {
return error;
}
if (fm->flags & OFPUTIL_FF_EMERG) {
/* We do not support the OpenFlow 1.0 emergency flow cache, which
* is not required in OpenFlow 1.0.1 and removed from OpenFlow 1.1.
*
* OpenFlow 1.0 specifies the error code to use when idle_timeout
* or hard_timeout is nonzero. Otherwise, there is no good error
* code, so just state that the flow table is full. */
return (fm->hard_timeout || fm->idle_timeout
? OFPERR_OFPFMFC_BAD_EMERG_TIMEOUT
: OFPERR_OFPFMFC_TABLE_FULL);
}
error = ofpacts_check_consistency(fm->ofpacts, fm->ofpacts_len,
&match, max_port,
fm->table_id, max_table, protocol);
if (!error) {
minimatch_init(&fm->match, &match);
}
return error;
}
static ovs_be16
ofputil_tid_command(const struct ofputil_flow_mod *fm,
enum ofputil_protocol protocol)
{
return htons(protocol & OFPUTIL_P_TID
? (fm->command & 0xff) | (fm->table_id << 8)
: fm->command);
}
/* Converts 'fm' into an OFPT_FLOW_MOD or NXT_FLOW_MOD message according to
* 'protocol' and returns the message. */
struct ofpbuf *
ofputil_encode_flow_mod(const struct ofputil_flow_mod *fm,
enum ofputil_protocol protocol)
{
enum ofp_version version = ofputil_protocol_to_ofp_version(protocol);
ovs_be16 raw_flags = ofputil_encode_flow_mod_flags(fm->flags, version);
struct ofpbuf *msg;
struct match match;
minimatch_expand(&fm->match, &match);
switch (protocol) {
case OFPUTIL_P_OF11_STD:
case OFPUTIL_P_OF12_OXM:
case OFPUTIL_P_OF13_OXM:
case OFPUTIL_P_OF14_OXM:
case OFPUTIL_P_OF15_OXM:
case OFPUTIL_P_OF16_OXM: {
struct ofp11_flow_mod *ofm;
int tailroom;
tailroom = ofputil_match_typical_len(protocol) + fm->ofpacts_len;
msg = ofpraw_alloc(OFPRAW_OFPT11_FLOW_MOD, version, tailroom);
ofm = ofpbuf_put_zeros(msg, sizeof *ofm);
if ((protocol == OFPUTIL_P_OF11_STD
&& (fm->command == OFPFC_MODIFY ||
fm->command == OFPFC_MODIFY_STRICT)
&& fm->cookie_mask == htonll(0))
|| fm->command == OFPFC_ADD) {
ofm->cookie = fm->new_cookie;
} else {
ofm->cookie = fm->cookie & fm->cookie_mask;
}
ofm->cookie_mask = fm->cookie_mask;
if (fm->table_id != OFPTT_ALL
|| (protocol != OFPUTIL_P_OF11_STD
&& (fm->command == OFPFC_DELETE ||
fm->command == OFPFC_DELETE_STRICT))) {
ofm->table_id = fm->table_id;
} else {
ofm->table_id = 0;
}
ofm->command = fm->command;
ofm->idle_timeout = htons(fm->idle_timeout);
ofm->hard_timeout = htons(fm->hard_timeout);
ofm->priority = htons(fm->priority);
ofm->buffer_id = htonl(fm->buffer_id);
ofm->out_port = ofputil_port_to_ofp11(fm->out_port);
ofm->out_group = htonl(fm->out_group);
ofm->flags = raw_flags;
if (version >= OFP14_VERSION && fm->command == OFPFC_ADD) {
ofm->importance = htons(fm->importance);
} else {
ofm->importance = 0;
}
ofputil_put_ofp11_match(msg, &match, protocol);
ofpacts_put_openflow_instructions(fm->ofpacts, fm->ofpacts_len, msg,
version);
break;
}
case OFPUTIL_P_OF10_STD:
case OFPUTIL_P_OF10_STD_TID: {
struct ofp10_flow_mod *ofm;
msg = ofpraw_alloc(OFPRAW_OFPT10_FLOW_MOD, OFP10_VERSION,
fm->ofpacts_len);
ofm = ofpbuf_put_zeros(msg, sizeof *ofm);
ofputil_match_to_ofp10_match(&match, &ofm->match);
ofm->cookie = fm->new_cookie;
ofm->command = ofputil_tid_command(fm, protocol);
ofm->idle_timeout = htons(fm->idle_timeout);
ofm->hard_timeout = htons(fm->hard_timeout);
ofm->priority = htons(fm->priority);
ofm->buffer_id = htonl(fm->buffer_id);
ofm->out_port = htons(ofp_to_u16(fm->out_port));
ofm->flags = raw_flags;
ofpacts_put_openflow_actions(fm->ofpacts, fm->ofpacts_len, msg,
version);
break;
}
case OFPUTIL_P_OF10_NXM:
case OFPUTIL_P_OF10_NXM_TID: {
struct nx_flow_mod *nfm;
int match_len;
msg = ofpraw_alloc(OFPRAW_NXT_FLOW_MOD, OFP10_VERSION,
NXM_TYPICAL_LEN + fm->ofpacts_len);
nfm = ofpbuf_put_zeros(msg, sizeof *nfm);
nfm->command = ofputil_tid_command(fm, protocol);
nfm->cookie = fm->new_cookie;
match_len = nx_put_match(msg, &match, fm->cookie, fm->cookie_mask);
nfm = msg->msg;
nfm->idle_timeout = htons(fm->idle_timeout);
nfm->hard_timeout = htons(fm->hard_timeout);
nfm->priority = htons(fm->priority);
nfm->buffer_id = htonl(fm->buffer_id);
nfm->out_port = htons(ofp_to_u16(fm->out_port));
nfm->flags = raw_flags;
nfm->match_len = htons(match_len);
ofpacts_put_openflow_actions(fm->ofpacts, fm->ofpacts_len, msg,
version);
break;
}
default:
OVS_NOT_REACHED();
}
ofpmsg_update_length(msg);
return msg;
}
enum ofperr
ofputil_flow_mod_format(struct ds *s, const struct ofp_header *oh,
const struct ofputil_port_map *port_map,
const struct ofputil_table_map *table_map,
int verbosity)
{
struct ofputil_flow_mod fm;
struct ofpbuf ofpacts;
bool need_priority;
enum ofperr error;
enum ofpraw raw;
enum ofputil_protocol protocol;
protocol = ofputil_protocol_from_ofp_version(oh->version);
protocol = ofputil_protocol_set_tid(protocol, true);
ofpbuf_init(&ofpacts, 64);
error = ofputil_decode_flow_mod(&fm, oh, protocol, NULL, NULL, &ofpacts,
OFPP_MAX, 255);
if (error) {
ofpbuf_uninit(&ofpacts);
return error;
}
ds_put_char(s, ' ');
switch (fm.command) {
case OFPFC_ADD:
ds_put_cstr(s, "ADD");
break;
case OFPFC_MODIFY:
ds_put_cstr(s, "MOD");
break;
case OFPFC_MODIFY_STRICT:
ds_put_cstr(s, "MOD_STRICT");
break;
case OFPFC_DELETE:
ds_put_cstr(s, "DEL");
break;
case OFPFC_DELETE_STRICT:
ds_put_cstr(s, "DEL_STRICT");
break;
default:
ds_put_format(s, "cmd:%d", fm.command);
}
if (fm.table_id != 0
|| ofputil_table_map_get_name(table_map, fm.table_id)) {
ds_put_format(s, " table:");
ofputil_format_table(fm.table_id, table_map, s);
}
ds_put_char(s, ' ');
ofpraw_decode(&raw, oh);
if (verbosity >= 3 && raw == OFPRAW_OFPT10_FLOW_MOD) {
const struct ofp10_flow_mod *ofm = ofpmsg_body(oh);
ofp10_match_print(s, &ofm->match, port_map, verbosity);
/* ofp_print_match() doesn't print priority. */
need_priority = true;
} else if (verbosity >= 3 && raw == OFPRAW_NXT_FLOW_MOD) {
const struct nx_flow_mod *nfm = ofpmsg_body(oh);
const void *nxm = nfm + 1;
char *nxm_s;
nxm_s = nx_match_to_string(nxm, ntohs(nfm->match_len));
ds_put_cstr(s, nxm_s);
free(nxm_s);
/* nx_match_to_string() doesn't print priority. */
need_priority = true;
} else {
struct match match;
minimatch_expand(&fm.match, &match);
match_format(&match, port_map, s, fm.priority);
/* match_format() does print priority. */
need_priority = false;
}
if (ds_last(s) != ' ') {
ds_put_char(s, ' ');
}
if (fm.new_cookie != htonll(0) && fm.new_cookie != OVS_BE64_MAX) {
ds_put_format(s, "cookie:0x%"PRIx64" ", ntohll(fm.new_cookie));
}
if (fm.cookie_mask != htonll(0)) {
ds_put_format(s, "cookie:0x%"PRIx64"/0x%"PRIx64" ",
ntohll(fm.cookie), ntohll(fm.cookie_mask));
}
if (fm.idle_timeout != OFP_FLOW_PERMANENT) {
ds_put_format(s, "idle:%"PRIu16" ", fm.idle_timeout);
}
if (fm.hard_timeout != OFP_FLOW_PERMANENT) {
ds_put_format(s, "hard:%"PRIu16" ", fm.hard_timeout);
}
if (fm.importance != 0) {
ds_put_format(s, "importance:%"PRIu16" ", fm.importance);
}
if (fm.priority != OFP_DEFAULT_PRIORITY && need_priority) {
ds_put_format(s, "pri:%d ", fm.priority);
}
if (fm.buffer_id != UINT32_MAX) {
ds_put_format(s, "buf:0x%"PRIx32" ", fm.buffer_id);
}
if (fm.out_port != OFPP_ANY) {
ds_put_format(s, "out_port:");
ofputil_format_port(fm.out_port, port_map, s);
ds_put_char(s, ' ');
}
if (oh->version == OFP10_VERSION || oh->version == OFP11_VERSION) {
/* Don't print the reset_counts flag for OF1.0 and OF1.1 because those
* versions don't really have such a flag and printing one is likely to
* confuse people. */
fm.flags &= ~OFPUTIL_FF_RESET_COUNTS;
}
ofputil_flow_mod_flags_format(s, fm.flags);
ds_put_cstr(s, "actions=");
struct ofpact_format_params fp = {
.port_map = port_map,
.table_map = table_map,
.s = s,
};
ofpacts_format(fm.ofpacts, fm.ofpacts_len, &fp);
ofpbuf_uninit(&ofpacts);
minimatch_destroy(&fm.match);
return 0;
}
static enum ofperr
ofputil_decode_ofpst10_flow_request(struct ofputil_flow_stats_request *fsr,
const struct ofp10_flow_stats_request *ofsr,
bool aggregate)
{
fsr->aggregate = aggregate;
ofputil_match_from_ofp10_match(&ofsr->match, &fsr->match);
fsr->out_port = u16_to_ofp(ntohs(ofsr->out_port));
fsr->out_group = OFPG_ANY;
fsr->table_id = ofsr->table_id;
fsr->cookie = fsr->cookie_mask = htonll(0);
return 0;
}
static enum ofperr
ofputil_decode_ofpst11_flow_request(struct ofputil_flow_stats_request *fsr,
struct ofpbuf *b, bool aggregate,
const struct tun_table *tun_table,
const struct vl_mff_map *vl_mff_map)
{
const struct ofp11_flow_stats_request *ofsr;
enum ofperr error;
ofsr = ofpbuf_pull(b, sizeof *ofsr);
fsr->aggregate = aggregate;
fsr->table_id = ofsr->table_id;
error = ofputil_port_from_ofp11(ofsr->out_port, &fsr->out_port);
if (error) {
return error;
}
fsr->out_group = ntohl(ofsr->out_group);
fsr->cookie = ofsr->cookie;
fsr->cookie_mask = ofsr->cookie_mask;
error = ofputil_pull_ofp11_match(b, tun_table, vl_mff_map, &fsr->match,
NULL);
if (error) {
return error;
}
return 0;
}
static enum ofperr
ofputil_decode_nxst_flow_request(struct ofputil_flow_stats_request *fsr,
struct ofpbuf *b, bool aggregate,
const struct tun_table *tun_table,
const struct vl_mff_map *vl_mff_map)
{
const struct nx_flow_stats_request *nfsr;
enum ofperr error;
nfsr = ofpbuf_pull(b, sizeof *nfsr);
error = nx_pull_match(b, ntohs(nfsr->match_len), &fsr->match,
&fsr->cookie, &fsr->cookie_mask, false, tun_table,
vl_mff_map);
if (error) {
return error;
}
if (b->size) {
return OFPERR_OFPBRC_BAD_LEN;
}
fsr->aggregate = aggregate;
fsr->out_port = u16_to_ofp(ntohs(nfsr->out_port));
fsr->out_group = OFPG_ANY;
fsr->table_id = nfsr->table_id;
return 0;
}
/* Converts an OFPST_FLOW, OFPST_AGGREGATE, NXST_FLOW, or NXST_AGGREGATE
* request 'oh', into an abstract flow_stats_request in 'fsr'. Returns 0 if
* successful, otherwise an OpenFlow error code.
*
* 'vl_mff_map' is an optional parameter that is used to validate the length
* of variable length mf_fields in 'match'. If it is not provided, the
* default mf_fields with maximum length will be used. */
enum ofperr
ofputil_decode_flow_stats_request(struct ofputil_flow_stats_request *fsr,
const struct ofp_header *oh,
const struct tun_table *tun_table,
const struct vl_mff_map *vl_mff_map)
{
struct ofpbuf b = ofpbuf_const_initializer(oh, ntohs(oh->length));
enum ofpraw raw = ofpraw_pull_assert(&b);
switch ((int) raw) {
case OFPRAW_OFPST10_FLOW_REQUEST:
return ofputil_decode_ofpst10_flow_request(fsr, b.data, false);
case OFPRAW_OFPST10_AGGREGATE_REQUEST:
return ofputil_decode_ofpst10_flow_request(fsr, b.data, true);
case OFPRAW_OFPST11_FLOW_REQUEST:
return ofputil_decode_ofpst11_flow_request(fsr, &b, false, tun_table,
vl_mff_map);
case OFPRAW_OFPST11_AGGREGATE_REQUEST:
return ofputil_decode_ofpst11_flow_request(fsr, &b, true, tun_table,
vl_mff_map);
case OFPRAW_OFPST15_AGGREGATE_REQUEST:
return ofputil_decode_ofpst11_flow_request(fsr, &b, true,
tun_table, vl_mff_map);
case OFPRAW_NXST_FLOW_REQUEST:
return ofputil_decode_nxst_flow_request(fsr, &b, false, tun_table,
vl_mff_map);
case OFPRAW_NXST_AGGREGATE_REQUEST:
return ofputil_decode_nxst_flow_request(fsr, &b, true, tun_table,
vl_mff_map);
default:
/* Hey, the caller lied. */
OVS_NOT_REACHED();
}
}
/* Converts abstract flow_stats_request 'fsr' into an OFPST_FLOW,
* OFPST_AGGREGATE, NXST_FLOW, or NXST_AGGREGATE request 'oh' according to
* 'protocol', and returns the message. */
struct ofpbuf *
ofputil_encode_flow_stats_request(const struct ofputil_flow_stats_request *fsr,
enum ofputil_protocol protocol)
{
struct ofpbuf *msg;
enum ofpraw raw;
switch (protocol) {
case OFPUTIL_P_OF11_STD:
case OFPUTIL_P_OF12_OXM:
case OFPUTIL_P_OF13_OXM:
case OFPUTIL_P_OF14_OXM:
case OFPUTIL_P_OF15_OXM:
case OFPUTIL_P_OF16_OXM: {
struct ofp11_flow_stats_request *ofsr;
if (protocol > OFPUTIL_P_OF14_OXM) {
raw = (fsr->aggregate
? OFPRAW_OFPST15_AGGREGATE_REQUEST
: OFPRAW_OFPST11_FLOW_REQUEST);
} else {
raw = (fsr->aggregate
? OFPRAW_OFPST11_AGGREGATE_REQUEST
: OFPRAW_OFPST11_FLOW_REQUEST);
}
msg = ofpraw_alloc(raw, ofputil_protocol_to_ofp_version(protocol),
ofputil_match_typical_len(protocol));
ofsr = ofpbuf_put_zeros(msg, sizeof *ofsr);
ofsr->table_id = fsr->table_id;
ofsr->out_port = ofputil_port_to_ofp11(fsr->out_port);
ofsr->out_group = htonl(fsr->out_group);
ofsr->cookie = fsr->cookie;
ofsr->cookie_mask = fsr->cookie_mask;
ofputil_put_ofp11_match(msg, &fsr->match, protocol);
break;
}
case OFPUTIL_P_OF10_STD:
case OFPUTIL_P_OF10_STD_TID: {
struct ofp10_flow_stats_request *ofsr;
raw = (fsr->aggregate
? OFPRAW_OFPST10_AGGREGATE_REQUEST
: OFPRAW_OFPST10_FLOW_REQUEST);
msg = ofpraw_alloc(raw, OFP10_VERSION, 0);
ofsr = ofpbuf_put_zeros(msg, sizeof *ofsr);
ofputil_match_to_ofp10_match(&fsr->match, &ofsr->match);
ofsr->table_id = fsr->table_id;
ofsr->out_port = htons(ofp_to_u16(fsr->out_port));
break;
}
case OFPUTIL_P_OF10_NXM:
case OFPUTIL_P_OF10_NXM_TID: {
struct nx_flow_stats_request *nfsr;
int match_len;
raw = (fsr->aggregate
? OFPRAW_NXST_AGGREGATE_REQUEST
: OFPRAW_NXST_FLOW_REQUEST);
msg = ofpraw_alloc(raw, OFP10_VERSION, NXM_TYPICAL_LEN);
ofpbuf_put_zeros(msg, sizeof *nfsr);
match_len = nx_put_match(msg, &fsr->match,
fsr->cookie, fsr->cookie_mask);
nfsr = msg->msg;
nfsr->out_port = htons(ofp_to_u16(fsr->out_port));
nfsr->match_len = htons(match_len);
nfsr->table_id = fsr->table_id;
break;
}
default:
OVS_NOT_REACHED();
}
return msg;
}
void
ofputil_flow_stats_request_format(struct ds *s,
const struct ofputil_flow_stats_request *fsr,
const struct ofputil_port_map *port_map,
const struct ofputil_table_map *table_map)
{
if (fsr->table_id != 0xff) {
ds_put_format(s, " table=");
ofputil_format_table(fsr->table_id, table_map, s);
}
if (fsr->out_port != OFPP_ANY) {
ds_put_cstr(s, " out_port=");
ofputil_format_port(fsr->out_port, port_map, s);
}
ds_put_char(s, ' ');
match_format(&fsr->match, port_map, s, OFP_DEFAULT_PRIORITY);
}
char * OVS_WARN_UNUSED_RESULT
parse_ofp_flow_stats_request_str(struct ofputil_flow_stats_request *fsr,
bool aggregate, const char *string,
const struct ofputil_port_map *port_map,
const struct ofputil_table_map *table_map,
enum ofputil_protocol *usable_protocols)
{
struct ofputil_flow_mod fm;
char *error;
error = parse_ofp_str(&fm, -1, string, port_map, table_map,
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;
minimatch_expand(&fm.match, &fsr->match);
fsr->out_port = fm.out_port;
fsr->out_group = fm.out_group;
fsr->table_id = fm.table_id;
minimatch_destroy(&fm.match);
return NULL;
}
/* Converts an OFPST_FLOW or NXST_FLOW reply in 'msg' into an abstract
* ofputil_flow_stats in 'fs'.
*
* Multiple OFPST_FLOW or NXST_FLOW replies can be packed into a single
* OpenFlow message. Calling this function multiple times for a single 'msg'
* iterates through the replies. The caller must initially leave 'msg''s layer
* pointers null and not modify them between calls.
*
* Most switches don't send the values needed to populate fs->idle_age and
* fs->hard_age, so those members will usually be set to 0. If the switch from
* which 'msg' originated is known to implement NXT_FLOW_AGE, then pass
* 'flow_age_extension' as true so that the contents of 'msg' determine the
* 'idle_age' and 'hard_age' members in 'fs'.
*
* Uses 'ofpacts' to store the abstract OFPACT_* version of the flow stats
* reply's actions. The caller must initialize 'ofpacts' and retains ownership
* of it. 'fs->ofpacts' will point into the 'ofpacts' buffer.
*
* Returns 0 if successful, EOF if no replies were left in this 'msg',
* otherwise an OFPERR_* value. */
int
ofputil_decode_flow_stats_reply(struct ofputil_flow_stats *fs,
struct ofpbuf *msg,
bool flow_age_extension,
struct ofpbuf *ofpacts)
{
const struct ofp_header *oh;
size_t instructions_len;
enum ofperr error;
enum ofpraw raw;
error = (msg->header ? ofpraw_decode(&raw, msg->header)
: ofpraw_pull(&raw, msg));
if (error) {
return error;
}
oh = msg->header;
if (!msg->size) {
return EOF;
} else if (raw == OFPRAW_OFPST15_FLOW_REPLY) {
const struct ofp15_flow_desc *ofd;
size_t length;
uint16_t padded_match_len;
uint16_t stat_len;
uint8_t oxs_field_set;
ofd = ofpbuf_try_pull(msg, sizeof *ofd);
if (!ofd) {
VLOG_WARN_RL(&rl, "OFPST_FLOW reply has %" PRIu32
" leftover " "bytes at end", msg->size);
return EINVAL;
}
length = ntohs(ofd->length);
if (length < sizeof *ofd) {
VLOG_WARN_RL(&rl, "OFPST_FLOW reply claims invalid "
"length %" PRIuSIZE, length);
return EINVAL;
}
if (ofputil_pull_ofp11_match(msg, NULL, NULL, &fs->match,
&padded_match_len)) {
VLOG_WARN_RL(&rl, "OFPST_FLOW reply bad match");
return EINVAL;
}
fs->priority = ntohs(ofd->priority);
fs->table_id = ofd->table_id;
fs->cookie = ofd->cookie;
fs->idle_timeout = ntohs(ofd->idle_timeout);
fs->hard_timeout = ntohs(ofd->hard_timeout);
fs->importance = ntohs(ofd->importance);
error = ofputil_decode_flow_mod_flags(ofd->flags, -1, oh->version,
&fs->flags);
if (error) {
return error;
}
struct oxs_stats oxs;
if (oxs_pull_stat(msg, &oxs, &stat_len, &oxs_field_set)) {
VLOG_WARN_RL(&rl, "OXS OFPST_FLOW reply bad stats");
return EINVAL;
}
fs->duration_sec = oxs.duration_sec;
fs->duration_nsec = oxs.duration_nsec;
fs->packet_count = oxs.packet_count;
fs->byte_count = oxs.byte_count;
fs->idle_age = oxs.idle_age == UINT32_MAX ? -1 : oxs.idle_age;
instructions_len = length - sizeof *ofd - padded_match_len - stat_len;
} else if (raw == OFPRAW_OFPST11_FLOW_REPLY
|| raw == OFPRAW_OFPST13_FLOW_REPLY) {
const struct ofp11_flow_stats *ofs;
size_t length;
uint16_t padded_match_len;
ofs = ofpbuf_try_pull(msg, sizeof *ofs);
if (!ofs) {
VLOG_WARN_RL(&rl, "OFPST_FLOW reply has %"PRIu32" leftover "
"bytes at end", msg->size);
return OFPERR_OFPBRC_BAD_LEN;
}
length = ntohs(ofs->length);
if (length < sizeof *ofs) {
VLOG_WARN_RL(&rl, "OFPST_FLOW reply claims invalid "
"length %"PRIuSIZE, length);
return OFPERR_OFPBRC_BAD_LEN;
}
error = ofputil_pull_ofp11_match(msg, NULL, NULL, &fs->match,
&padded_match_len);
if (error) {
VLOG_WARN_RL(&rl, "OFPST_FLOW reply bad match");
return error;
}
instructions_len = length - sizeof *ofs - padded_match_len;
fs->priority = ntohs(ofs->priority);
fs->table_id = ofs->table_id;
fs->duration_sec = ntohl(ofs->duration_sec);
fs->duration_nsec = ntohl(ofs->duration_nsec);
fs->idle_timeout = ntohs(ofs->idle_timeout);
fs->hard_timeout = ntohs(ofs->hard_timeout);
if (oh->version >= OFP14_VERSION) {
fs->importance = ntohs(ofs->importance);
} else {
fs->importance = 0;
}
if (raw == OFPRAW_OFPST13_FLOW_REPLY) {
error = ofputil_decode_flow_mod_flags(ofs->flags, -1, oh->version,
&fs->flags);
if (error) {
return error;
}
} else {
fs->flags = 0;
}
fs->idle_age = -1;
fs->hard_age = -1;
fs->cookie = ofs->cookie;
fs->packet_count = ntohll(ofs->packet_count);
fs->byte_count = ntohll(ofs->byte_count);
} else if (raw == OFPRAW_OFPST10_FLOW_REPLY) {
const struct ofp10_flow_stats *ofs;
size_t length;
ofs = ofpbuf_try_pull(msg, sizeof *ofs);
if (!ofs) {
VLOG_WARN_RL(&rl, "OFPST_FLOW reply has %"PRIu32" leftover "
"bytes at end", msg->size);
return OFPERR_OFPBRC_BAD_LEN;
}
length = ntohs(ofs->length);
if (length < sizeof *ofs) {
VLOG_WARN_RL(&rl, "OFPST_FLOW reply claims invalid "
"length %"PRIuSIZE, length);
return OFPERR_OFPBRC_BAD_LEN;
}
instructions_len = length - sizeof *ofs;
fs->cookie = get_32aligned_be64(&ofs->cookie);
ofputil_match_from_ofp10_match(&ofs->match, &fs->match);
fs->priority = ntohs(ofs->priority);
fs->table_id = ofs->table_id;
fs->duration_sec = ntohl(ofs->duration_sec);
fs->duration_nsec = ntohl(ofs->duration_nsec);
fs->idle_timeout = ntohs(ofs->idle_timeout);
fs->hard_timeout = ntohs(ofs->hard_timeout);
fs->importance = 0;
fs->idle_age = -1;
fs->hard_age = -1;
fs->packet_count = ntohll(get_32aligned_be64(&ofs->packet_count));
fs->byte_count = ntohll(get_32aligned_be64(&ofs->byte_count));
fs->flags = 0;
} else if (raw == OFPRAW_NXST_FLOW_REPLY) {
const struct nx_flow_stats *nfs;
size_t match_len, length;
nfs = ofpbuf_try_pull(msg, sizeof *nfs);
if (!nfs) {
VLOG_WARN_RL(&rl, "NXST_FLOW reply has %"PRIu32" leftover "
"bytes at end", msg->size);
return OFPERR_OFPBRC_BAD_LEN;
}
length = ntohs(nfs->length);
match_len = ntohs(nfs->match_len);
if (length < sizeof *nfs + ROUND_UP(match_len, 8)) {
VLOG_WARN_RL(&rl, "NXST_FLOW reply with match_len=%"PRIuSIZE" "
"claims invalid length %"PRIuSIZE, match_len, length);
return OFPERR_OFPBRC_BAD_LEN;
}
error = nx_pull_match(msg, match_len, &fs->match, NULL, NULL, false,
NULL, NULL);
if (error) {
return error;
}
instructions_len = length - sizeof *nfs - ROUND_UP(match_len, 8);
fs->cookie = nfs->cookie;
fs->table_id = nfs->table_id;
fs->duration_sec = ntohl(nfs->duration_sec);
fs->duration_nsec = ntohl(nfs->duration_nsec);
fs->priority = ntohs(nfs->priority);
fs->idle_timeout = ntohs(nfs->idle_timeout);
fs->hard_timeout = ntohs(nfs->hard_timeout);
fs->importance = 0;
fs->idle_age = -1;
fs->hard_age = -1;
if (flow_age_extension) {
if (nfs->idle_age) {
fs->idle_age = ntohs(nfs->idle_age) - 1;
}
if (nfs->hard_age) {
fs->hard_age = ntohs(nfs->hard_age) - 1;
}
}
fs->packet_count = ntohll(nfs->packet_count);
fs->byte_count = ntohll(nfs->byte_count);
fs->flags = 0;
} else {
OVS_NOT_REACHED();
}
error = ofpacts_pull_openflow_instructions(msg, instructions_len,
oh->version, NULL, NULL,
ofpacts);
if (error) {
VLOG_WARN_RL(&rl, "OFPST_FLOW reply bad instructions");
return error;
}
fs->ofpacts = ofpacts->data;
fs->ofpacts_len = ofpacts->size;
return 0;
}
/* Returns 'count' unchanged except that UINT64_MAX becomes 0.
*
* We use this in situations where OVS internally uses UINT64_MAX to mean
* "value unknown" but OpenFlow 1.0 does not define any unknown value. */
static uint64_t
unknown_to_zero(uint64_t count)
{
return count != UINT64_MAX ? count : 0;
}
/* Appends an OFPST_FLOW or NXST_FLOW reply that contains the data in 'fs' to
* those already present in the list of ofpbufs in 'replies'. 'replies' should
* have been initialized with ofpmp_init(). */
void
ofputil_append_flow_stats_reply(const struct ofputil_flow_stats *fs,
struct ovs_list *replies,
const struct tun_table *tun_table)
{
struct ofputil_flow_stats *fs_ = CONST_CAST(struct ofputil_flow_stats *,
fs);
const struct tun_table *orig_tun_table;
struct ofpbuf *reply = ofpbuf_from_list(ovs_list_back(replies));
size_t start_ofs = reply->size;
enum ofp_version version = ofpmp_version(replies);
enum ofpraw raw = ofpmp_decode_raw(replies);
orig_tun_table = fs->match.flow.tunnel.metadata.tab;
fs_->match.flow.tunnel.metadata.tab = tun_table;
if (raw == OFPRAW_OFPST15_FLOW_REPLY) {
struct ofp15_flow_desc *ofd;
ofpbuf_put_uninit(reply, sizeof *ofd);
oxm_put_match(reply, &fs->match, version);
struct oxs_stats oxs = {
.duration_sec = fs->duration_sec,
.duration_nsec = fs->duration_nsec,
.idle_age = fs->idle_age >= 0 ? fs->idle_age : UINT32_MAX,
.packet_count = fs->packet_count,
.byte_count = fs->byte_count,
.flow_count = UINT32_MAX,
};
oxs_put_stats(reply, &oxs);
ofpacts_put_openflow_instructions(fs->ofpacts, fs->ofpacts_len, reply,
version);
ofd = ofpbuf_at_assert(reply, start_ofs, sizeof *ofd);
ofd->length = htons(reply->size - start_ofs);
ofd->table_id = fs->table_id;
ofd->priority = htons(fs->priority);
ofd->idle_timeout = htons(fs->idle_timeout);
ofd->hard_timeout = htons(fs->hard_timeout);
ofd->cookie = fs->cookie;
memset(ofd->pad2, 0, sizeof ofd->pad2);
ofd->pad = 0;
ofd->importance = htons(fs->importance);
ofd->flags = ofputil_encode_flow_mod_flags(fs->flags, version);
} else if (raw == OFPRAW_OFPST11_FLOW_REPLY ||
raw == OFPRAW_OFPST13_FLOW_REPLY) {
struct ofp11_flow_stats *ofs;
ofpbuf_put_uninit(reply, sizeof *ofs);
oxm_put_match(reply, &fs->match, version);
ofpacts_put_openflow_instructions(fs->ofpacts, fs->ofpacts_len, reply,
version);
ofs = ofpbuf_at_assert(reply, start_ofs, sizeof *ofs);
ofs->length = htons(reply->size - start_ofs);
ofs->table_id = fs->table_id;
ofs->pad = 0;
ofs->duration_sec = htonl(fs->duration_sec);
ofs->duration_nsec = htonl(fs->duration_nsec);
ofs->priority = htons(fs->priority);
ofs->idle_timeout = htons(fs->idle_timeout);
ofs->hard_timeout = htons(fs->hard_timeout);
if (version >= OFP14_VERSION) {
ofs->importance = htons(fs->importance);
} else {
ofs->importance = 0;
}
if (raw == OFPRAW_OFPST13_FLOW_REPLY) {
ofs->flags = ofputil_encode_flow_mod_flags(fs->flags, version);
} else {
ofs->flags = 0;
}
memset(ofs->pad2, 0, sizeof ofs->pad2);
ofs->cookie = fs->cookie;
ofs->packet_count = htonll(unknown_to_zero(fs->packet_count));
ofs->byte_count = htonll(unknown_to_zero(fs->byte_count));
} else if (raw == OFPRAW_OFPST10_FLOW_REPLY) {
struct ofp10_flow_stats *ofs;
ofpbuf_put_uninit(reply, sizeof *ofs);
ofpacts_put_openflow_actions(fs->ofpacts, fs->ofpacts_len, reply,
version);
ofs = ofpbuf_at_assert(reply, start_ofs, sizeof *ofs);
ofs->length = htons(reply->size - start_ofs);
ofs->table_id = fs->table_id;
ofs->pad = 0;
ofputil_match_to_ofp10_match(&fs->match, &ofs->match);
ofs->duration_sec = htonl(fs->duration_sec);
ofs->duration_nsec = htonl(fs->duration_nsec);
ofs->priority = htons(fs->priority);
ofs->idle_timeout = htons(fs->idle_timeout);
ofs->hard_timeout = htons(fs->hard_timeout);
memset(ofs->pad2, 0, sizeof ofs->pad2);
put_32aligned_be64(&ofs->cookie, fs->cookie);
put_32aligned_be64(&ofs->packet_count,
htonll(unknown_to_zero(fs->packet_count)));
put_32aligned_be64(&ofs->byte_count,
htonll(unknown_to_zero(fs->byte_count)));
} else if (raw == OFPRAW_NXST_FLOW_REPLY) {
struct nx_flow_stats *nfs;
int match_len;
ofpbuf_put_uninit(reply, sizeof *nfs);
match_len = nx_put_match(reply, &fs->match, 0, 0);
ofpacts_put_openflow_actions(fs->ofpacts, fs->ofpacts_len, reply,
version);
nfs = ofpbuf_at_assert(reply, start_ofs, sizeof *nfs);
nfs->length = htons(reply->size - start_ofs);
nfs->table_id = fs->table_id;
nfs->pad = 0;
nfs->duration_sec = htonl(fs->duration_sec);
nfs->duration_nsec = htonl(fs->duration_nsec);
nfs->priority = htons(fs->priority);
nfs->idle_timeout = htons(fs->idle_timeout);
nfs->hard_timeout = htons(fs->hard_timeout);
nfs->idle_age = htons(fs->idle_age < 0 ? 0
: fs->idle_age < UINT16_MAX ? fs->idle_age + 1
: UINT16_MAX);
nfs->hard_age = htons(fs->hard_age < 0 ? 0
: fs->hard_age < UINT16_MAX ? fs->hard_age + 1
: UINT16_MAX);
nfs->match_len = htons(match_len);
nfs->cookie = fs->cookie;
nfs->packet_count = htonll(fs->packet_count);
nfs->byte_count = htonll(fs->byte_count);
} else {
OVS_NOT_REACHED();
}
ofpmp_postappend(replies, start_ofs);
fs_->match.flow.tunnel.metadata.tab = orig_tun_table;
}
static void
print_flow_stat(struct ds *string, const char *leader, uint64_t stat)
{
ds_put_format(string, "%s%s=%s", colors.param, leader, colors.end);
if (stat != UINT64_MAX) {
ds_put_format(string, "%"PRIu64, stat);
} else {
ds_put_char(string, '?');
}
ds_put_cstr(string, ", ");
}
/* Appends a textual form of 'fs' to 'string', translating port numbers to
* names using 'port_map' (if provided). If 'show_stats' is true, the output
* includes the flow duration, packet and byte counts, and its idle and hard
* ages, otherwise they are omitted. */
void
ofputil_flow_stats_format(struct ds *string,
const struct ofputil_flow_stats *fs,
const struct ofputil_port_map *port_map,
const struct ofputil_table_map *table_map,
bool show_stats)
{
if (show_stats || fs->cookie) {
ds_put_format(string, "%scookie=%s0x%"PRIx64", ",
colors.param, colors.end, ntohll(fs->cookie));
}
if (show_stats) {
ds_put_format(string, "%sduration=%s", colors.param, colors.end);
ofp_print_duration(string, fs->duration_sec, fs->duration_nsec);
ds_put_cstr(string, ", ");
}
if (show_stats || fs->table_id
|| ofputil_table_map_get_name(table_map, fs->table_id) != NULL) {
ds_put_format(string, "%stable=%s", colors.special, colors.end);
ofputil_format_table(fs->table_id, table_map, string);
ds_put_cstr(string, ", ");
}
if (show_stats) {
print_flow_stat(string, "n_packets", fs->packet_count);
print_flow_stat(string, "n_bytes", fs->byte_count);
}
if (fs->idle_timeout != OFP_FLOW_PERMANENT) {
ds_put_format(string, "%sidle_timeout=%s%"PRIu16", ",
colors.param, colors.end, fs->idle_timeout);
}
if (fs->hard_timeout != OFP_FLOW_PERMANENT) {
ds_put_format(string, "%shard_timeout=%s%"PRIu16", ",
colors.param, colors.end, fs->hard_timeout);
}
if (fs->flags) {
ofputil_flow_mod_flags_format(string, fs->flags);
}
if (fs->importance != 0) {
ds_put_format(string, "%simportance=%s%"PRIu16", ",
colors.param, colors.end, fs->importance);
}
if (show_stats && fs->idle_age >= 0) {
ds_put_format(string, "%sidle_age=%s%d, ",
colors.param, colors.end, fs->idle_age);
}
if (show_stats && fs->hard_age >= 0 && fs->hard_age != fs->duration_sec) {
ds_put_format(string, "%shard_age=%s%d, ",
colors.param, colors.end, fs->hard_age);
}
/* Print the match, followed by a space (but omit the space if the match
* was an empty string). */
size_t length = string->length;
match_format(&fs->match, port_map, string, fs->priority);
if (string->length != length) {
ds_put_char(string, ' ');
}
ds_put_format(string, "%sactions=%s", colors.actions, colors.end);
struct ofpact_format_params fp = {
.port_map = port_map,
.table_map = table_map,
.s = string,
};
ofpacts_format(fs->ofpacts, fs->ofpacts_len, &fp);
}
/* Converts abstract ofputil_aggregate_stats 'stats' into an OFPST_AGGREGATE or
* NXST_AGGREGATE reply matching 'request', and returns the message. */
struct ofpbuf *
ofputil_encode_aggregate_stats_reply(
const struct ofputil_aggregate_stats *stats,
const struct ofp_header *request)
{
struct ofp_aggregate_stats_reply *asr;
uint64_t packet_count;
uint64_t byte_count;
struct ofpbuf *msg;
enum ofpraw raw;
ofpraw_decode(&raw, request);
if (raw == OFPRAW_OFPST15_AGGREGATE_REQUEST) {
msg = ofpraw_alloc_stats_reply(request, 0);
struct oxs_stats oxs = {
.duration_sec = UINT32_MAX,
.duration_nsec = UINT32_MAX,
.idle_age = UINT32_MAX,
.packet_count = stats->packet_count,
.byte_count = stats->byte_count,
.flow_count = stats->flow_count,
};
oxs_put_stats(msg, &oxs);
} else {
if (raw == OFPRAW_OFPST10_AGGREGATE_REQUEST) {
packet_count = unknown_to_zero(stats->packet_count);
byte_count = unknown_to_zero(stats->byte_count);
} else {
packet_count = stats->packet_count;
byte_count = stats->byte_count;
}
msg = ofpraw_alloc_stats_reply(request, 0);
asr = ofpbuf_put_zeros(msg, sizeof *asr);
put_32aligned_be64(&asr->packet_count, htonll(packet_count));
put_32aligned_be64(&asr->byte_count, htonll(byte_count));
asr->flow_count = htonl(stats->flow_count);
}
return msg;
}
enum ofperr
ofputil_decode_aggregate_stats_reply(struct ofputil_aggregate_stats *stats,
const struct ofp_header *reply)
{
struct ofpbuf msg = ofpbuf_const_initializer(reply, ntohs(reply->length));
enum ofpraw raw;
raw = ofpraw_pull_assert(&msg);
if (raw == OFPRAW_OFPST15_AGGREGATE_REPLY) {
struct oxs_stats oxs;
uint16_t statlen;
uint8_t oxs_field_set;
enum ofperr error = oxs_pull_stat(&msg, &oxs, &statlen,
&oxs_field_set);
if (error) {
return error;
}
stats->packet_count = oxs.packet_count;
stats->byte_count = oxs.byte_count;
stats->flow_count = oxs.flow_count;
} else {
struct ofp_aggregate_stats_reply *asr = msg.msg;
stats->packet_count = ntohll(get_32aligned_be64(&asr->packet_count));
stats->byte_count = ntohll(get_32aligned_be64(&asr->byte_count));
stats->flow_count = ntohl(asr->flow_count);
}
return 0;
}
void
ofputil_aggregate_stats_format(struct ds *s,
const struct ofputil_aggregate_stats *as)
{
ds_put_format(s, " packet_count=%"PRIu64, as->packet_count);
ds_put_format(s, " byte_count=%"PRIu64, as->byte_count);
ds_put_format(s, " flow_count=%"PRIu32, as->flow_count);
}
/* Parses 'str_value' as the value of subfield 'name', 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 * OVS_WARN_UNUSED_RESULT
parse_subfield(const char *name, const char *str_value, struct match *match,
enum ofputil_protocol *usable_protocols)
{
struct mf_subfield sf;
char *error;
error = mf_parse_subfield(&sf, name);
if (!error) {
union mf_value val;
char *tail;
if (parse_int_string(str_value, (uint8_t *)&val, sf.field->n_bytes,
&tail) || *tail != 0) {
return xasprintf("%s: cannot parse integer value: %s", name,
str_value);
}
if (!bitwise_is_all_zeros(&val, sf.field->n_bytes, sf.n_bits,
sf.field->n_bytes * 8 - sf.n_bits)) {
struct ds ds;
ds_init(&ds);
mf_format(sf.field, &val, NULL, NULL, &ds);
error = xasprintf("%s: value %s does not fit into %d bits",
name, ds_cstr(&ds), sf.n_bits);
ds_destroy(&ds);
return error;
}
const struct mf_field *field = sf.field;
union mf_value value, mask;
unsigned int size = field->n_bytes;
mf_get(field, match, &value, &mask);
bitwise_copy(&val, size, 0, &value, size, sf.ofs, sf.n_bits);
bitwise_one ( &mask, size, sf.ofs, sf.n_bits);
*usable_protocols &= mf_set(field, &value, &mask, match, &error);
match_add_ethernet_prereq(match, sf.field);
}
return error;
}
static char * OVS_WARN_UNUSED_RESULT
parse_ofp_str__(struct ofputil_flow_mod *fm, int command, char *string,
const struct ofputil_port_map *port_map,
const struct ofputil_table_map *table_map,
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 *act_str = NULL;
char *name, *value;
*usable_protocols = OFPUTIL_P_ANY;
if (command == -2) {
size_t len;
string += strspn(string, " \t\r\n"); /* Skip white space. */
len = strcspn(string, ", \t\r\n"); /* Get length of the first token. */
if (!strncmp(string, "add", len)) {
command = OFPFC_ADD;
} else if (!strncmp(string, "delete", len)) {
command = OFPFC_DELETE;
} else if (!strncmp(string, "delete_strict", len)) {
command = OFPFC_DELETE_STRICT;
} else if (!strncmp(string, "modify", len)) {
command = OFPFC_MODIFY;
} else if (!strncmp(string, "modify_strict", len)) {
command = OFPFC_MODIFY_STRICT;
} else {
len = 0;
command = OFPFC_ADD;
}
string += len;
}
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();
}
*fm = (struct ofputil_flow_mod) {
.priority = OFP_DEFAULT_PRIORITY,
.table_id = 0xff,
.command = command,
.buffer_id = UINT32_MAX,
.out_port = OFPP_ANY,
.out_group = OFPG_ANY,
};
/* For modify, by default, don't update the cookie. */
if (command == OFPFC_MODIFY || command == OFPFC_MODIFY_STRICT) {
fm->new_cookie = OVS_BE64_MAX;
}
if (fields & F_ACTIONS) {
act_str = ofp_extract_actions(string);
if (!act_str) {
return xstrdup("must specify an action");
}
}
struct match match = MATCH_CATCHALL_INITIALIZER;
while (ofputil_parse_key_value(&string, &name, &value)) {
const struct ofp_protocol *p;
const struct mf_field *mf;
char *error = NULL;
if (ofp_parse_protocol(name, &p)) {
match_set_dl_type(&match, htons(p->dl_type));
if (p->nw_proto) {
match_set_nw_proto(&match, p->nw_proto);
}
match_set_default_packet_type(&match);
} else if (!strcmp(name, "eth")) {
match_set_packet_type(&match, htonl(PT_ETH));
} 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 if ((mf = mf_from_name(name)) != NULL) {
error = ofp_parse_field(mf, value, port_map,
&match, usable_protocols);
} else if (strchr(name, '[')) {
error = parse_subfield(name, value, &match, usable_protocols);
} else {
if (!*value) {
return xasprintf("field %s missing value", name);
}
if (!strcmp(name, "table")) {
if (!ofputil_table_from_string(value, table_map,
&fm->table_id)) {
return xasprintf("unknown table \"%s\"", value);
}
if (fm->table_id != 0xff) {
*usable_protocols &= OFPUTIL_P_TID;
}
} else if (fields & F_OUT_PORT && !strcmp(name, "out_port")) {
if (!ofputil_port_from_string(value, port_map,
&fm->out_port)) {
error = xasprintf("%s is not a valid OpenFlow port",
value);
}
} else if (fields & F_OUT_PORT && !strcmp(name, "out_group")) {
*usable_protocols &= OFPUTIL_P_OF11_UP;
if (!ofputil_group_from_string(value, &fm->out_group)) {
error = xasprintf("%s is not a valid OpenFlow group",
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 (!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;
}
}
/* Copy ethertype to flow->dl_type for matches on packet_type
* (OFPHTN_ETHERTYPE, ethertype). */
if (match.wc.masks.packet_type == OVS_BE32_MAX &&
pt_ns(match.flow.packet_type) == OFPHTN_ETHERTYPE) {
match.flow.dl_type = pt_ns_type_be(match.flow.packet_type);
}
/* Check for usable protocol interdependencies between match fields. */
if (match.flow.dl_type == htons(ETH_TYPE_IPV6)) {
const struct flow_wildcards *wc = &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);
struct ofpact_parse_params pp = {
.port_map = port_map,
.table_map = table_map,
.ofpacts = &ofpacts,
.usable_protocols = &action_usable_protocols
};
error = ofpacts_parse_instructions(act_str, &pp);
*usable_protocols &= action_usable_protocols;
if (!error) {
enum ofperr err;
err = ofpacts_check(ofpacts.data, ofpacts.size, &match,
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 = ofpacts.size;
fm->ofpacts = ofpbuf_steal_data(&ofpacts);
} else {
fm->ofpacts_len = 0;
fm->ofpacts = NULL;
}
minimatch_init(&fm->match, &match);
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'.
*
* If 'command' is given as -2, 'str_' may begin with a command name ("add",
* "modify", "delete", "modify_strict", or "delete_strict"). A missing command
* name is treated as "add".
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string.
*
* On success, the caller is responsible for freeing fm->ofpacts and
* fm->match. */
char * OVS_WARN_UNUSED_RESULT
parse_ofp_str(struct ofputil_flow_mod *fm, int command, const char *str_,
const struct ofputil_port_map *port_map,
const struct ofputil_table_map *table_map,
enum ofputil_protocol *usable_protocols)
{
char *string = xstrdup(str_);
char *error;
error = parse_ofp_str__(fm, command, string, port_map, table_map,
usable_protocols);
if (error) {
fm->ofpacts = NULL;
fm->ofpacts_len = 0;
}
free(string);
return error;
}
/* Parses 'string' as an OFPT_FLOW_MOD or NXT_FLOW_MOD with command 'command'
* (one of OFPFC_*) into 'fm'.
*
* If 'command' is given as -2, 'string' may begin with a command name ("add",
* "modify", "delete", "modify_strict", or "delete_strict"). A missing command
* name is treated as "add".
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * OVS_WARN_UNUSED_RESULT
parse_ofp_flow_mod_str(struct ofputil_flow_mod *fm, const char *string,
const struct ofputil_port_map *port_map,
const struct ofputil_table_map *table_map,
int command,
enum ofputil_protocol *usable_protocols)
{
char *error = parse_ofp_str(fm, command, string, port_map, table_map,
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;
minimatch_expand(&fm->match, &match);
ofputil_normalize_match(&match);
}
return error;
}
/* 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'.
*
* If 'command' is given as -2, each line may start with a command name
* ("add", "modify", "delete", "modify_strict", or "delete_strict"). A missing
* command name is treated as "add".
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * OVS_WARN_UNUSED_RESULT
parse_ofp_flow_mod_file(const char *file_name,
const struct ofputil_port_map *port_map,
const struct ofputil_table_map *table_map,
int 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), port_map,
table_map, command, &usable);
if (error) {
char *err_msg;
size_t i;
for (i = 0; i < *n_fms; i++) {
free(CONST_CAST(struct ofpact *, (*fms)[i].ofpacts));
minimatch_destroy(&(*fms)[i].match);
}
free(*fms);
*fms = NULL;
*n_fms = 0;
ds_destroy(&s);
if (stream != stdin) {
fclose(stream);
}
err_msg = xasprintf("%s:%d: %s", file_name, line_number, error);
free(error);
return err_msg;
}
*usable_protocols &= usable; /* Each line can narrow the set. */
*n_fms += 1;
}
ds_destroy(&s);
if (stream != stdin) {
fclose(stream);
}
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 'wc' is specified, masks the field in 'wc' 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_wildcards *wc,
const struct tun_table *tun_table, const char *s,
const struct ofputil_port_map *port_map)
{
char *pos, *key, *value_s;
char *error = NULL;
char *copy;
memset(flow, 0, sizeof *flow);
if (wc) {
memset(wc, 0, sizeof *wc);
}
flow->tunnel.metadata.tab = tun_table;
pos = copy = xstrdup(s);
while (ofputil_parse_key_value(&pos, &key, &value_s)) {
const struct ofp_protocol *p;
if (ofp_parse_protocol(key, &p)) {
if (flow->dl_type) {
error = xasprintf("%s: Ethernet type set multiple times", s);
goto exit;
}
flow->dl_type = htons(p->dl_type);
if (wc) {
wc->masks.dl_type = OVS_BE16_MAX;
}
if (p->nw_proto) {
if (flow->nw_proto) {
error = xasprintf("%s: network protocol set "
"multiple times", s);
goto exit;
}
flow->nw_proto = p->nw_proto;
if (wc) {
wc->masks.nw_proto = UINT8_MAX;
}
}
} else {
const struct mf_field *mf;
union mf_value value;
char *field_error;
mf = mf_from_name(key);
if (!mf) {
error = xasprintf("%s: unknown field %s", s, key);
goto exit;
}
if (!mf_are_prereqs_ok(mf, flow, NULL)) {
error = xasprintf("%s: prerequisites not met for setting %s",
s, key);
goto exit;
}
if (mf_is_set(mf, flow)) {
error = xasprintf("%s: field %s set multiple times", s, key);
goto exit;
}
field_error = mf_parse_value(mf, value_s, port_map, &value);
if (field_error) {
error = xasprintf("%s: bad value for %s (%s)",
s, key, field_error);
free(field_error);
goto exit;
}
mf_set_flow_value(mf, &value, flow);
if (wc) {
mf_mask_field(mf, wc);
}
}
}
if (!flow->in_port.ofp_port) {
flow->in_port.ofp_port = OFPP_NONE;
}
exit:
free(copy);
if (error) {
memset(flow, 0, sizeof *flow);
if (wc) {
memset(wc, 0, sizeof *wc);
}
}
return error;
}
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