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openvswitch/lib/ofp-parse.c
Andy Zhou bd85dac14e nicira-ext: Add Nicira actions NXAST_STACK_PUSH and NXAST_STACK_POP. 
The Push action takes a single parameter. Any source allowed by NXAST_REG_MOVE
is allowed to be pushed onto the stack. When the source is a bit field,
its value will be right shifted to bit zero before being pushed onto the
stack. The remaining bits will be set to zero.

The Pop action also takes a single parameter. Any destination allowed by
NXAST_REG_MOVE can be used as the destination of the action. The value, in
case of a bit field, will be taken from top of the stack, starting from
bit zero.

The stack size is not limited. The initial 8KB is statically allocated to
efficiently handle most common use cases. When more stack space is
required, the stack can grow using malloc().

Signed-off-by: Andy Zhou <azhou@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
2013-03-06 13:40:28 -08:00

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/*
* Copyright (c) 2010, 2011, 2012 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 "packets.h"
#include "socket-util.h"
#include "vconn.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(ofp_parse);
static void ofp_fatal(const char *flow, bool verbose, const char *format, ...)
NO_RETURN;
static uint8_t
str_to_table_id(const char *str)
{
int table_id;
if (!str_to_int(str, 10, &table_id) || table_id < 0 || table_id > 255) {
ovs_fatal(0, "invalid table \"%s\"", str);
}
return table_id;
}
static uint16_t
str_to_u16(const char *str, const char *name)
{
int value;
if (!str_to_int(str, 0, &value) || value < 0 || value > 65535) {
ovs_fatal(0, "invalid %s \"%s\"", name, str);
}
return value;
}
static uint32_t
str_to_u32(const char *str)
{
char *tail;
uint32_t value;
if (!str[0]) {
ovs_fatal(0, "missing required numeric argument");
}
errno = 0;
value = strtoul(str, &tail, 0);
if (errno == EINVAL || errno == ERANGE || *tail) {
ovs_fatal(0, "invalid numeric format %s", str);
}
return value;
}
static uint64_t
str_to_u64(const char *str)
{
char *tail;
uint64_t value;
if (!str[0]) {
ovs_fatal(0, "missing required numeric argument");
}
errno = 0;
value = strtoull(str, &tail, 0);
if (errno == EINVAL || errno == ERANGE || *tail) {
ovs_fatal(0, "invalid numeric format %s", str);
}
return value;
}
static void
str_to_mac(const char *str, uint8_t mac[6])
{
if (sscanf(str, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac))
!= ETH_ADDR_SCAN_COUNT) {
ovs_fatal(0, "invalid mac address %s", str);
}
}
static void
str_to_ip(const char *str, ovs_be32 *ip)
{
struct in_addr in_addr;
if (lookup_ip(str, &in_addr)) {
ovs_fatal(0, "%s: could not convert to IP address", str);
}
*ip = in_addr.s_addr;
}
static void
parse_enqueue(char *arg, struct ofpbuf *ofpacts)
{
char *sp = NULL;
char *port = strtok_r(arg, ":q", &sp);
char *queue = strtok_r(NULL, "", &sp);
struct ofpact_enqueue *enqueue;
if (port == NULL || queue == NULL) {
ovs_fatal(0, "\"enqueue\" syntax is \"enqueue:PORT:QUEUE\"");
}
enqueue = ofpact_put_ENQUEUE(ofpacts);
enqueue->port = str_to_u32(port);
enqueue->queue = str_to_u32(queue);
}
static void
parse_output(char *arg, struct ofpbuf *ofpacts)
{
if (strchr(arg, '[')) {
struct ofpact_output_reg *output_reg;
output_reg = ofpact_put_OUTPUT_REG(ofpacts);
mf_parse_subfield(&output_reg->src, arg);
output_reg->max_len = UINT16_MAX;
} else {
struct ofpact_output *output;
output = ofpact_put_OUTPUT(ofpacts);
output->port = str_to_u32(arg);
output->max_len = output->port == OFPP_CONTROLLER ? UINT16_MAX : 0;
}
}
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_note(const char *arg, struct ofpbuf *ofpacts)
{
struct ofpact_note *note;
note = ofpact_put_NOTE(ofpacts);
while (*arg != '\0') {
uint8_t byte;
bool ok;
if (*arg == '.') {
arg++;
}
if (*arg == '\0') {
break;
}
byte = hexits_value(arg, 2, &ok);
if (!ok) {
ovs_fatal(0, "bad hex digit in `note' argument");
}
ofpbuf_put(ofpacts, &byte, 1);
note = ofpacts->l2;
note->length++;
arg += 2;
}
ofpact_update_len(ofpacts, &note->ofpact);
}
static void
parse_fin_timeout(struct ofpbuf *b, char *arg)
{
struct ofpact_fin_timeout *oft = ofpact_put_FIN_TIMEOUT(b);
char *key, *value;
while (ofputil_parse_key_value(&arg, &key, &value)) {
if (!strcmp(key, "idle_timeout")) {
oft->fin_idle_timeout = str_to_u16(value, key);
} else if (!strcmp(key, "hard_timeout")) {
oft->fin_hard_timeout = str_to_u16(value, key);
} else {
ovs_fatal(0, "invalid key '%s' in 'fin_timeout' argument", key);
}
}
}
static void
parse_controller(struct ofpbuf *b, char *arg)
{
enum ofp_packet_in_reason reason = OFPR_ACTION;
uint16_t controller_id = 0;
uint16_t max_len = UINT16_MAX;
if (!arg[0]) {
/* Use defaults. */
} else if (strspn(arg, "0123456789") == strlen(arg)) {
max_len = str_to_u16(arg, "max_len");
} else {
char *name, *value;
while (ofputil_parse_key_value(&arg, &name, &value)) {
if (!strcmp(name, "reason")) {
if (!ofputil_packet_in_reason_from_string(value, &reason)) {
ovs_fatal(0, "unknown reason \"%s\"", value);
}
} else if (!strcmp(name, "max_len")) {
max_len = str_to_u16(value, "max_len");
} else if (!strcmp(name, "id")) {
controller_id = str_to_u16(value, "id");
} else {
ovs_fatal(0, "unknown key \"%s\" parsing controller action",
name);
}
}
}
if (reason == OFPR_ACTION && controller_id == 0) {
struct ofpact_output *output;
output = ofpact_put_OUTPUT(b);
output->port = OFPP_CONTROLLER;
output->max_len = max_len;
} else {
struct ofpact_controller *controller;
controller = ofpact_put_CONTROLLER(b);
controller->max_len = max_len;
controller->reason = reason;
controller->controller_id = controller_id;
}
}
static void
parse_noargs_dec_ttl(struct ofpbuf *b)
{
struct ofpact_cnt_ids *ids;
uint16_t id = 0;
ids = ofpact_put_DEC_TTL(b);
ofpbuf_put(b, &id, sizeof id);
ids = b->l2;
ids->n_controllers++;
ofpact_update_len(b, &ids->ofpact);
}
static void
parse_dec_ttl(struct ofpbuf *b, char *arg)
{
if (*arg == '\0') {
parse_noargs_dec_ttl(b);
} else {
struct ofpact_cnt_ids *ids;
char *cntr;
ids = ofpact_put_DEC_TTL(b);
ids->ofpact.compat = OFPUTIL_NXAST_DEC_TTL_CNT_IDS;
for (cntr = strtok_r(arg, ", ", &arg); cntr != NULL;
cntr = strtok_r(NULL, ", ", &arg)) {
uint16_t id = atoi(cntr);
ofpbuf_put(b, &id, sizeof id);
ids = b->l2;
ids->n_controllers++;
}
if (!ids->n_controllers) {
ovs_fatal(0, "dec_ttl_cnt_ids: expected at least one controller "
"id.");
}
ofpact_update_len(b, &ids->ofpact);
}
}
static void
parse_set_mpls_ttl(struct ofpbuf *b, const char *arg)
{
struct ofpact_mpls_ttl *mpls_ttl = ofpact_put_SET_MPLS_TTL(b);
if (*arg == '\0') {
ovs_fatal(0, "parse_set_mpls_ttl: expected ttl.");
}
mpls_ttl->ttl = atoi(arg);
}
static void
set_field_parse(const char *arg, struct ofpbuf *ofpacts)
{
char *orig = xstrdup(arg);
struct ofpact_reg_load *load = ofpact_put_REG_LOAD(ofpacts);
char *value;
char *delim;
char *key;
const struct mf_field *mf;
const char *error;
union mf_value mf_value;
value = orig;
delim = strstr(orig, "->");
if (!delim) {
ovs_fatal(0, "%s: missing `->'", orig);
}
if (strlen(delim) <= strlen("->")) {
ovs_fatal(0, "%s: missing field name following `->'", orig);
}
key = delim + strlen("->");
mf = mf_from_name(key);
if (!mf) {
ovs_fatal(0, "%s is not valid oxm field name", key);
}
if (!mf->writable) {
ovs_fatal(0, "%s is not allowed to set", key);
}
delim[0] = '\0';
error = mf_parse_value(mf, value, &mf_value);
if (error) {
ovs_fatal(0, "%s", error);
}
if (!mf_is_value_valid(mf, &mf_value)) {
ovs_fatal(0, "%s is not valid valid for field %s", value, key);
}
ofpact_set_field_init(load, mf, &mf_value);
free(orig);
}
static void
parse_metadata(struct ofpbuf *b, char *arg)
{
struct ofpact_metadata *om;
char *mask = strchr(arg, '/');
om = ofpact_put_WRITE_METADATA(b);
if (mask) {
*mask = '\0';
om->mask = htonll(str_to_u64(mask + 1));
} else {
om->mask = htonll(UINT64_MAX);
}
om->metadata = htonll(str_to_u64(arg));
}
static void
parse_named_action(enum ofputil_action_code code, const struct flow *flow,
char *arg, struct ofpbuf *ofpacts)
{
struct ofpact_tunnel *tunnel;
uint16_t vid;
uint16_t ethertype;
ovs_be32 ip;
uint8_t pcp;
uint8_t tos;
switch (code) {
case OFPUTIL_ACTION_INVALID:
NOT_REACHED();
case OFPUTIL_OFPAT10_OUTPUT:
case OFPUTIL_OFPAT11_OUTPUT:
parse_output(arg, ofpacts);
break;
case OFPUTIL_OFPAT10_SET_VLAN_VID:
case OFPUTIL_OFPAT11_SET_VLAN_VID:
vid = str_to_u32(arg);
if (vid & ~VLAN_VID_MASK) {
ovs_fatal(0, "%s: not a valid VLAN VID", arg);
}
ofpact_put_SET_VLAN_VID(ofpacts)->vlan_vid = vid;
break;
case OFPUTIL_OFPAT10_SET_VLAN_PCP:
case OFPUTIL_OFPAT11_SET_VLAN_PCP:
pcp = str_to_u32(arg);
if (pcp & ~7) {
ovs_fatal(0, "%s: not a valid VLAN PCP", arg);
}
ofpact_put_SET_VLAN_PCP(ofpacts)->vlan_pcp = pcp;
break;
case OFPUTIL_OFPAT12_SET_FIELD:
set_field_parse(arg, ofpacts);
break;
case OFPUTIL_OFPAT10_STRIP_VLAN:
case OFPUTIL_OFPAT11_POP_VLAN:
ofpact_put_STRIP_VLAN(ofpacts);
break;
case OFPUTIL_OFPAT11_PUSH_VLAN:
ethertype = str_to_u16(arg, "ethertype");
if (ethertype != ETH_TYPE_VLAN_8021Q) {
/* XXX ETH_TYPE_VLAN_8021AD case isn't supported */
ovs_fatal(0, "%s: not a valid VLAN ethertype", arg);
}
ofpact_put_PUSH_VLAN(ofpacts);
break;
case OFPUTIL_OFPAT11_SET_QUEUE:
ofpact_put_SET_QUEUE(ofpacts)->queue_id = str_to_u32(arg);
break;
case OFPUTIL_OFPAT10_SET_DL_SRC:
case OFPUTIL_OFPAT11_SET_DL_SRC:
str_to_mac(arg, ofpact_put_SET_ETH_SRC(ofpacts)->mac);
break;
case OFPUTIL_OFPAT10_SET_DL_DST:
case OFPUTIL_OFPAT11_SET_DL_DST:
str_to_mac(arg, ofpact_put_SET_ETH_DST(ofpacts)->mac);
break;
case OFPUTIL_OFPAT10_SET_NW_SRC:
case OFPUTIL_OFPAT11_SET_NW_SRC:
str_to_ip(arg, &ip);
ofpact_put_SET_IPV4_SRC(ofpacts)->ipv4 = ip;
break;
case OFPUTIL_OFPAT10_SET_NW_DST:
case OFPUTIL_OFPAT11_SET_NW_DST:
str_to_ip(arg, &ip);
ofpact_put_SET_IPV4_DST(ofpacts)->ipv4 = ip;
break;
case OFPUTIL_OFPAT10_SET_NW_TOS:
case OFPUTIL_OFPAT11_SET_NW_TOS:
tos = str_to_u32(arg);
if (tos & ~IP_DSCP_MASK) {
ovs_fatal(0, "%s: not a valid TOS", arg);
}
ofpact_put_SET_IPV4_DSCP(ofpacts)->dscp = tos;
break;
case OFPUTIL_OFPAT11_DEC_NW_TTL:
NOT_REACHED();
case OFPUTIL_OFPAT10_SET_TP_SRC:
case OFPUTIL_OFPAT11_SET_TP_SRC:
ofpact_put_SET_L4_SRC_PORT(ofpacts)->port = str_to_u32(arg);
break;
case OFPUTIL_OFPAT10_SET_TP_DST:
case OFPUTIL_OFPAT11_SET_TP_DST:
ofpact_put_SET_L4_DST_PORT(ofpacts)->port = str_to_u32(arg);
break;
case OFPUTIL_OFPAT10_ENQUEUE:
parse_enqueue(arg, ofpacts);
break;
case OFPUTIL_NXAST_RESUBMIT:
parse_resubmit(arg, ofpacts);
break;
case OFPUTIL_NXAST_SET_TUNNEL:
case OFPUTIL_NXAST_SET_TUNNEL64:
tunnel = ofpact_put_SET_TUNNEL(ofpacts);
tunnel->ofpact.compat = code;
tunnel->tun_id = str_to_u64(arg);
break;
case OFPUTIL_NXAST_WRITE_METADATA:
parse_metadata(ofpacts, arg);
break;
case OFPUTIL_NXAST_SET_QUEUE:
ofpact_put_SET_QUEUE(ofpacts)->queue_id = str_to_u32(arg);
break;
case OFPUTIL_NXAST_POP_QUEUE:
ofpact_put_POP_QUEUE(ofpacts);
break;
case OFPUTIL_NXAST_REG_MOVE:
nxm_parse_reg_move(ofpact_put_REG_MOVE(ofpacts), arg);
break;
case OFPUTIL_NXAST_REG_LOAD:
nxm_parse_reg_load(ofpact_put_REG_LOAD(ofpacts), arg);
break;
case OFPUTIL_NXAST_NOTE:
parse_note(arg, ofpacts);
break;
case OFPUTIL_NXAST_MULTIPATH:
multipath_parse(ofpact_put_MULTIPATH(ofpacts), arg);
break;
case OFPUTIL_NXAST_BUNDLE:
bundle_parse(arg, ofpacts);
break;
case OFPUTIL_NXAST_BUNDLE_LOAD:
bundle_parse_load(arg, ofpacts);
break;
case OFPUTIL_NXAST_RESUBMIT_TABLE:
case OFPUTIL_NXAST_OUTPUT_REG:
case OFPUTIL_NXAST_DEC_TTL_CNT_IDS:
NOT_REACHED();
case OFPUTIL_NXAST_LEARN:
learn_parse(arg, flow, ofpacts);
break;
case OFPUTIL_NXAST_EXIT:
ofpact_put_EXIT(ofpacts);
break;
case OFPUTIL_NXAST_DEC_TTL:
parse_dec_ttl(ofpacts, arg);
break;
case OFPUTIL_NXAST_SET_MPLS_TTL:
case OFPUTIL_OFPAT11_SET_MPLS_TTL:
parse_set_mpls_ttl(ofpacts, arg);
break;
case OFPUTIL_OFPAT11_DEC_MPLS_TTL:
case OFPUTIL_NXAST_DEC_MPLS_TTL:
ofpact_put_DEC_MPLS_TTL(ofpacts);
break;
case OFPUTIL_NXAST_FIN_TIMEOUT:
parse_fin_timeout(ofpacts, arg);
break;
case OFPUTIL_NXAST_CONTROLLER:
parse_controller(ofpacts, arg);
break;
case OFPUTIL_OFPAT11_PUSH_MPLS:
case OFPUTIL_NXAST_PUSH_MPLS:
ofpact_put_PUSH_MPLS(ofpacts)->ethertype =
htons(str_to_u16(arg, "push_mpls"));
break;
case OFPUTIL_OFPAT11_POP_MPLS:
case OFPUTIL_NXAST_POP_MPLS:
ofpact_put_POP_MPLS(ofpacts)->ethertype =
htons(str_to_u16(arg, "pop_mpls"));
break;
case OFPUTIL_NXAST_STACK_PUSH:
nxm_parse_stack_action(ofpact_put_STACK_PUSH(ofpacts), arg);
break;
case OFPUTIL_NXAST_STACK_POP:
nxm_parse_stack_action(ofpact_put_STACK_POP(ofpacts), arg);
break;
}
}
static bool
str_to_ofpact__(const struct flow *flow, 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, flow, 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 {
uint16_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
str_to_ofpacts(const struct flow *flow, char *str, struct ofpbuf *ofpacts)
{
char *pos, *act, *arg;
enum ofperr error;
int n_actions;
pos = str;
n_actions = 0;
while (ofputil_parse_key_value(&pos, &act, &arg)) {
if (!str_to_ofpact__(flow, pos, act, arg, ofpacts, n_actions)) {
break;
}
n_actions++;
}
error = ofpacts_verify(ofpacts->data, ofpacts->size);
if (error) {
ovs_fatal(0, "Incorrect action ordering");
}
ofpact_pad(ofpacts);
}
static void
parse_named_instruction(enum ovs_instruction_type type,
char *arg, struct ofpbuf *ofpacts)
{
enum ofperr error;
switch (type) {
case OVSINST_OFPIT11_APPLY_ACTIONS:
NOT_REACHED(); /* This case is handled by str_to_inst_ofpacts() */
break;
case OVSINST_OFPIT11_WRITE_ACTIONS:
/* XXX */
ovs_fatal(0, "instruction write-actions is not supported yet");
break;
case OVSINST_OFPIT11_CLEAR_ACTIONS:
ofpact_put_CLEAR_ACTIONS(ofpacts);
break;
case OVSINST_OFPIT11_WRITE_METADATA:
parse_metadata(ofpacts, arg);
break;
case OVSINST_OFPIT11_GOTO_TABLE: {
struct ofpact_goto_table *ogt = ofpact_put_GOTO_TABLE(ofpacts);
char *table_s = strsep(&arg, ",");
if (!table_s || !table_s[0]) {
ovs_fatal(0, "instruction goto-table needs table id");
}
ogt->table_id = str_to_table_id(table_s);
break;
}
}
/* If write_metadata is specified as an action AND an instruction, ofpacts
could be invalid. */
error = ofpacts_verify(ofpacts->data, ofpacts->size);
if (error) {
ovs_fatal(0, "Incorrect instruction ordering");
}
}
static void
str_to_inst_ofpacts(const struct flow *flow, char *str, struct ofpbuf *ofpacts)
{
char *pos, *inst, *arg;
int type;
const char *prev_inst = NULL;
int prev_type = -1;
int n_actions = 0;
pos = str;
while (ofputil_parse_key_value(&pos, &inst, &arg)) {
type = ofpact_instruction_type_from_name(inst);
if (type < 0) {
if (!str_to_ofpact__(flow, pos, inst, arg, ofpacts, n_actions)) {
break;
}
type = OVSINST_OFPIT11_APPLY_ACTIONS;
if (prev_type == type) {
n_actions++;
continue;
}
} else if (type == OVSINST_OFPIT11_APPLY_ACTIONS) {
ovs_fatal(0, "%s isn't supported. Just write actions then "
"it is interpreted as apply_actions", inst);
} else {
parse_named_instruction(type, arg, ofpacts);
}
if (type == prev_type) {
ovs_fatal(0, "instruction can be specified at most once: %s",
inst);
}
if (type <= prev_type) {
ovs_fatal(0, "Instruction %s must be specified before %s",
inst, prev_inst);
}
prev_inst = inst;
prev_type = type;
n_actions++;
}
ofpact_pad(ofpacts);
}
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 },
{ "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 },
{ "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;
}
static void
ofp_fatal(const char *flow, bool verbose, const char *format, ...)
{
va_list args;
if (verbose) {
fprintf(stderr, "%s:\n", flow);
}
va_start(args, format);
ovs_fatal_valist(0, format, args);
}
static void
parse_field(const struct mf_field *mf, const char *s, struct match *match)
{
union mf_value value, mask;
char *error;
error = mf_parse(mf, s, &value, &mask);
if (error) {
ovs_fatal(0, "%s", error);
}
mf_set(mf, &value, &mask, match);
}
/* 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_table_id(value);
} else if (!strcmp(name, "out_port")) {
if (!ofputil_port_from_string(name, &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;
ofpbuf_init(&ofpacts, 32);
str_to_inst_ofpacts(&fm->match.flow, act_str, &ofpacts);
fm->ofpacts_len = ofpacts.size;
fm->ofpacts = ofpbuf_steal_data(&ofpacts);
} else {
fm->ofpacts_len = 0;
fm->ofpacts = NULL;
}
free(string);
}
/* Convert 'str_' (as described in the documentation for the "monitor" command
* in the ovs-ofctl man page) into 'fmr'. */
void
parse_flow_monitor_request(struct ofputil_flow_monitor_request *fmr,
const char *str_)
{
static uint32_t id;
char *string = xstrdup(str_);
char *save_ptr = NULL;
char *name;
fmr->id = 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) {
ovs_fatal(0, "%s: field %s missing value", str_, name);
}
if (!strcmp(name, "table")) {
fmr->table_id = str_to_table_id(value);
} else if (!strcmp(name, "out_port")) {
fmr->out_port = atoi(value);
} else if (mf_from_name(name)) {
parse_field(mf_from_name(name), value, &fmr->match);
} else {
ovs_fatal(0, "%s: unknown keyword %s", str_, name);
}
}
}
free(string);
}
/* Parses 's' as a set of OpenFlow actions and appends the actions to
* 'actions'.
*
* Prints an error on stderr and aborts the program if 's' syntax is
* invalid. */
void
parse_ofpacts(const char *s_, struct ofpbuf *ofpacts)
{
char *s = xstrdup(s_);
str_to_ofpacts(NULL, s, ofpacts);
free(s);
}
/* Parses 'string' as an OFPT_FLOW_MOD or NXT_FLOW_MOD with command 'command'
* (one of OFPFC_*) into 'fm'. */
void
parse_ofp_flow_mod_str(struct ofputil_flow_mod *fm, const char *string,
uint16_t command, bool verbose)
{
struct match match_copy;
parse_ofp_str(fm, command, string, verbose);
/* 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. */
match_copy = fm->match;
ofputil_normalize_match(&match_copy);
}
void
parse_ofp_flow_mod_file(const char *file_name, uint16_t command,
struct ofputil_flow_mod **fms, size_t *n_fms)
{
size_t allocated_fms;
FILE *stream;
struct ds s;
stream = !strcmp(file_name, "-") ? stdin : fopen(file_name, "r");
if (stream == NULL) {
ovs_fatal(errno, "%s: open", file_name);
}
allocated_fms = *n_fms;
ds_init(&s);
while (!ds_get_preprocessed_line(&s, stream)) {
if (*n_fms >= allocated_fms) {
*fms = x2nrealloc(*fms, &allocated_fms, sizeof **fms);
}
parse_ofp_flow_mod_str(&(*fms)[*n_fms], ds_cstr(&s), command, false);
*n_fms += 1;
}
ds_destroy(&s);
if (stream != stdin) {
fclose(stream);
}
}
void
parse_ofp_flow_stats_request_str(struct ofputil_flow_stats_request *fsr,
bool aggregate, const char *string)
{
struct ofputil_flow_mod fm;
parse_ofp_str(&fm, -1, string, false);
fsr->aggregate = aggregate;
fsr->cookie = fm.cookie;
fsr->cookie_mask = fm.cookie_mask;
fsr->match = fm.match;
fsr->out_port = fm.out_port;
fsr->table_id = fm.table_id;
}
/* 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.
*
* Returns NULL on success, otherwise a malloc()'d string that explains the
* problem. */
char *
parse_ofp_exact_flow(struct flow *flow, const char *s)
{
char *pos, *key, *value_s;
char *error = NULL;
char *copy;
memset(flow, 0, sizeof *flow);
pos = copy = xstrdup(s);
while (ofputil_parse_key_value(&pos, &key, &value_s)) {
const struct protocol *p;
if (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 (p->nw_proto) {
if (flow->nw_proto) {
error = xasprintf("%s: network protocol set "
"multiple times", s);
goto exit;
}
flow->nw_proto = p->nw_proto;
}
} 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)) {
error = xasprintf("%s: prerequisites not met for setting %s",
s, key);
goto exit;
}
if (!mf_is_zero(mf, flow)) {
error = xasprintf("%s: field %s set multiple times", s, key);
goto exit;
}
field_error = mf_parse_value(mf, value_s, &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 (!flow->in_port) {
flow->in_port = OFPP_NONE;
}
exit:
free(copy);
if (error) {
memset(flow, 0, sizeof *flow);
}
return error;
}
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