2 * Copyright (c) 2010 Nicira Networks.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include "ofp-parse.h"
27 #include "openflow/openflow.h"
29 #include "socket-util.h"
34 VLOG_DEFINE_THIS_MODULE(ofp_parse)
37 str_to_u32(const char *str)
43 value = strtoul(str, &tail, 0);
44 if (errno == EINVAL || errno == ERANGE || *tail) {
45 ovs_fatal(0, "invalid numeric format %s", str);
51 str_to_u64(const char *str)
57 value = strtoull(str, &tail, 0);
58 if (errno == EINVAL || errno == ERANGE || *tail) {
59 ovs_fatal(0, "invalid numeric format %s", str);
65 str_to_mac(const char *str, uint8_t mac[6])
67 if (sscanf(str, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac))
68 != ETH_ADDR_SCAN_COUNT) {
69 ovs_fatal(0, "invalid mac address %s", str);
74 str_to_ip(const char *str_, uint32_t *ip)
76 char *str = xstrdup(str_);
77 char *save_ptr = NULL;
78 const char *name, *netmask;
79 struct in_addr in_addr;
82 name = strtok_r(str, "/", &save_ptr);
83 retval = name ? lookup_ip(name, &in_addr) : EINVAL;
85 ovs_fatal(0, "%s: could not convert to IP address", str);
89 netmask = strtok_r(NULL, "/", &save_ptr);
92 if (sscanf(netmask, "%"SCNu8".%"SCNu8".%"SCNu8".%"SCNu8,
93 &o[0], &o[1], &o[2], &o[3]) == 4) {
94 uint32_t nm = (o[0] << 24) | (o[1] << 16) | (o[2] << 8) | o[3];
97 /* Find first 1-bit. */
98 for (i = 0; i < 32; i++) {
105 /* Verify that the rest of the bits are 1-bits. */
106 for (; i < 32; i++) {
107 if (!(nm & (1u << i))) {
108 ovs_fatal(0, "%s: %s is not a valid netmask",
113 int prefix = atoi(netmask);
114 if (prefix <= 0 || prefix > 32) {
115 ovs_fatal(0, "%s: network prefix bits not between 1 and 32",
118 n_wild = 32 - prefix;
129 put_action(struct ofpbuf *b, size_t size, uint16_t type)
131 struct ofp_action_header *ah = ofpbuf_put_zeros(b, size);
132 ah->type = htons(type);
133 ah->len = htons(size);
137 static struct ofp_action_output *
138 put_output_action(struct ofpbuf *b, uint16_t port)
140 struct ofp_action_output *oao = put_action(b, sizeof *oao, OFPAT_OUTPUT);
141 oao->port = htons(port);
146 put_enqueue_action(struct ofpbuf *b, uint16_t port, uint32_t queue)
148 struct ofp_action_enqueue *oae = put_action(b, sizeof *oae, OFPAT_ENQUEUE);
149 oae->port = htons(port);
150 oae->queue_id = htonl(queue);
154 put_dl_addr_action(struct ofpbuf *b, uint16_t type, const char *addr)
156 struct ofp_action_dl_addr *oada = put_action(b, sizeof *oada, type);
157 str_to_mac(addr, oada->dl_addr);
162 parse_port_name(const char *name, uint16_t *port)
168 static const struct pair pairs[] = {
169 #define DEF_PAIR(NAME) {#NAME, OFPP_##NAME}
175 DEF_PAIR(CONTROLLER),
180 static const int n_pairs = ARRAY_SIZE(pairs);
183 for (i = 0; i < n_pairs; i++) {
184 if (!strcasecmp(name, pairs[i].name)) {
185 *port = pairs[i].value;
193 str_to_action(char *str, struct ofpbuf *b)
196 char *saveptr = NULL;
200 for (act = strtok_r(str, ", \t\r\n", &saveptr), n_actions = 0; act;
201 act = strtok_r(NULL, ", \t\r\n", &saveptr), n_actions++)
206 ovs_fatal(0, "Drop actions must not be followed by other actions");
209 /* Arguments are separated by colons */
210 arg = strchr(act, ':');
216 if (!strcasecmp(act, "mod_vlan_vid")) {
217 struct ofp_action_vlan_vid *va;
218 va = put_action(b, sizeof *va, OFPAT_SET_VLAN_VID);
219 va->vlan_vid = htons(str_to_u32(arg));
220 } else if (!strcasecmp(act, "mod_vlan_pcp")) {
221 struct ofp_action_vlan_pcp *va;
222 va = put_action(b, sizeof *va, OFPAT_SET_VLAN_PCP);
223 va->vlan_pcp = str_to_u32(arg);
224 } else if (!strcasecmp(act, "strip_vlan")) {
225 struct ofp_action_header *ah;
226 ah = put_action(b, sizeof *ah, OFPAT_STRIP_VLAN);
227 ah->type = htons(OFPAT_STRIP_VLAN);
228 } else if (!strcasecmp(act, "mod_dl_src")) {
229 put_dl_addr_action(b, OFPAT_SET_DL_SRC, arg);
230 } else if (!strcasecmp(act, "mod_dl_dst")) {
231 put_dl_addr_action(b, OFPAT_SET_DL_DST, arg);
232 } else if (!strcasecmp(act, "mod_nw_src")) {
233 struct ofp_action_nw_addr *na;
234 na = put_action(b, sizeof *na, OFPAT_SET_NW_SRC);
235 str_to_ip(arg, &na->nw_addr);
236 } else if (!strcasecmp(act, "mod_nw_dst")) {
237 struct ofp_action_nw_addr *na;
238 na = put_action(b, sizeof *na, OFPAT_SET_NW_DST);
239 str_to_ip(arg, &na->nw_addr);
240 } else if (!strcasecmp(act, "mod_tp_src")) {
241 struct ofp_action_tp_port *ta;
242 ta = put_action(b, sizeof *ta, OFPAT_SET_TP_SRC);
243 ta->tp_port = htons(str_to_u32(arg));
244 } else if (!strcasecmp(act, "mod_tp_dst")) {
245 struct ofp_action_tp_port *ta;
246 ta = put_action(b, sizeof *ta, OFPAT_SET_TP_DST);
247 ta->tp_port = htons(str_to_u32(arg));
248 } else if (!strcasecmp(act, "mod_nw_tos")) {
249 struct ofp_action_nw_tos *nt;
250 nt = put_action(b, sizeof *nt, OFPAT_SET_NW_TOS);
251 nt->nw_tos = str_to_u32(arg);
252 } else if (!strcasecmp(act, "resubmit")) {
253 struct nx_action_resubmit *nar;
254 nar = put_action(b, sizeof *nar, OFPAT_VENDOR);
255 nar->vendor = htonl(NX_VENDOR_ID);
256 nar->subtype = htons(NXAST_RESUBMIT);
257 nar->in_port = htons(str_to_u32(arg));
258 } else if (!strcasecmp(act, "set_tunnel")) {
259 struct nx_action_set_tunnel *nast;
260 nast = put_action(b, sizeof *nast, OFPAT_VENDOR);
261 nast->vendor = htonl(NX_VENDOR_ID);
262 nast->subtype = htons(NXAST_SET_TUNNEL);
263 nast->tun_id = htonl(str_to_u32(arg));
264 } else if (!strcasecmp(act, "drop_spoofed_arp")) {
265 struct nx_action_header *nah;
266 nah = put_action(b, sizeof *nah, OFPAT_VENDOR);
267 nah->vendor = htonl(NX_VENDOR_ID);
268 nah->subtype = htons(NXAST_DROP_SPOOFED_ARP);
269 } else if (!strcasecmp(act, "output")) {
270 put_output_action(b, str_to_u32(arg));
271 } else if (!strcasecmp(act, "enqueue")) {
273 char *port_s = strtok_r(arg, ":q", &sp);
274 char *queue = strtok_r(NULL, "", &sp);
275 if (port_s == NULL || queue == NULL) {
276 ovs_fatal(0, "\"enqueue\" syntax is \"enqueue:PORT:QUEUE\"");
278 put_enqueue_action(b, str_to_u32(port_s), str_to_u32(queue));
279 } else if (!strcasecmp(act, "drop")) {
280 /* A drop action in OpenFlow occurs by just not setting
284 ovs_fatal(0, "Drop actions must not be preceded by other "
287 } else if (!strcasecmp(act, "CONTROLLER")) {
288 struct ofp_action_output *oao;
289 oao = put_output_action(b, OFPP_CONTROLLER);
291 /* Unless a numeric argument is specified, we send the whole
292 * packet to the controller. */
293 if (arg && (strspn(arg, "0123456789") == strlen(arg))) {
294 oao->max_len = htons(str_to_u32(arg));
296 oao->max_len = htons(UINT16_MAX);
298 } else if (parse_port_name(act, &port)) {
299 put_output_action(b, port);
300 } else if (strspn(act, "0123456789") == strlen(act)) {
301 put_output_action(b, str_to_u32(act));
303 ovs_fatal(0, "Unknown action: %s", act);
315 parse_protocol(const char *name, const struct protocol **p_out)
317 static const struct protocol protocols[] = {
318 { "ip", ETH_TYPE_IP, 0 },
319 { "arp", ETH_TYPE_ARP, 0 },
320 { "icmp", ETH_TYPE_IP, IP_TYPE_ICMP },
321 { "tcp", ETH_TYPE_IP, IP_TYPE_TCP },
322 { "udp", ETH_TYPE_IP, IP_TYPE_UDP },
324 const struct protocol *p;
326 for (p = protocols; p < &protocols[ARRAY_SIZE(protocols)]; p++) {
327 if (!strcmp(p->name, name)) {
339 enum { F_U8, F_U16, F_MAC, F_IP } type;
340 size_t offset, shift;
344 parse_field(const char *name, const struct field **f_out)
346 #define F_OFS(MEMBER) offsetof(struct ofp_match, MEMBER)
347 static const struct field fields[] = {
348 { "in_port", OFPFW_IN_PORT, F_U16, F_OFS(in_port), 0 },
349 { "dl_vlan", OFPFW_DL_VLAN, F_U16, F_OFS(dl_vlan), 0 },
350 { "dl_vlan_pcp", OFPFW_DL_VLAN_PCP, F_U8, F_OFS(dl_vlan_pcp), 0 },
351 { "dl_src", OFPFW_DL_SRC, F_MAC, F_OFS(dl_src), 0 },
352 { "dl_dst", OFPFW_DL_DST, F_MAC, F_OFS(dl_dst), 0 },
353 { "dl_type", OFPFW_DL_TYPE, F_U16, F_OFS(dl_type), 0 },
354 { "nw_src", OFPFW_NW_SRC_MASK, F_IP,
355 F_OFS(nw_src), OFPFW_NW_SRC_SHIFT },
356 { "nw_dst", OFPFW_NW_DST_MASK, F_IP,
357 F_OFS(nw_dst), OFPFW_NW_DST_SHIFT },
358 { "nw_proto", OFPFW_NW_PROTO, F_U8, F_OFS(nw_proto), 0 },
359 { "nw_tos", OFPFW_NW_TOS, F_U8, F_OFS(nw_tos), 0 },
360 { "tp_src", OFPFW_TP_SRC, F_U16, F_OFS(tp_src), 0 },
361 { "tp_dst", OFPFW_TP_DST, F_U16, F_OFS(tp_dst), 0 },
362 { "icmp_type", OFPFW_ICMP_TYPE, F_U16, F_OFS(icmp_type), 0 },
363 { "icmp_code", OFPFW_ICMP_CODE, F_U16, F_OFS(icmp_code), 0 }
365 const struct field *f;
367 for (f = fields; f < &fields[ARRAY_SIZE(fields)]; f++) {
368 if (!strcmp(f->name, name)) {
377 /* Convert 'string' (as described in the Flow Syntax section of the
378 * ovs-ofctl man page) into 'match'. The other arguments are optional
379 * and may be NULL if their value is not needed. If 'actions' is
380 * specified, an action must be in 'string' and may be expanded or
383 parse_ofp_str(char *string, struct ofp_match *match, struct ofpbuf *actions,
384 uint8_t *table_idx, uint16_t *out_port, uint16_t *priority,
385 uint16_t *idle_timeout, uint16_t *hard_timeout,
388 struct ofp_match normalized;
389 char *save_ptr = NULL;
397 *out_port = OFPP_NONE;
400 *priority = OFP_DEFAULT_PRIORITY;
403 *idle_timeout = OFP_FLOW_PERMANENT;
406 *hard_timeout = OFP_FLOW_PERMANENT;
412 char *act_str = strstr(string, "action");
414 ovs_fatal(0, "must specify an action");
418 act_str = strchr(act_str + 1, '=');
420 ovs_fatal(0, "must specify an action");
425 str_to_action(act_str, actions);
427 memset(match, 0, sizeof *match);
428 wildcards = OFPFW_ALL;
429 for (name = strtok_r(string, "=, \t\r\n", &save_ptr); name;
430 name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
431 const struct protocol *p;
433 if (parse_protocol(name, &p)) {
434 wildcards &= ~OFPFW_DL_TYPE;
435 match->dl_type = htons(p->dl_type);
437 wildcards &= ~OFPFW_NW_PROTO;
438 match->nw_proto = p->nw_proto;
441 const struct field *f;
444 value = strtok_r(NULL, ", \t\r\n", &save_ptr);
446 ovs_fatal(0, "field %s missing value", name);
449 if (table_idx && !strcmp(name, "table")) {
450 *table_idx = atoi(value);
451 } else if (out_port && !strcmp(name, "out_port")) {
452 *out_port = atoi(value);
453 } else if (priority && !strcmp(name, "priority")) {
454 *priority = atoi(value);
455 } else if (idle_timeout && !strcmp(name, "idle_timeout")) {
456 *idle_timeout = atoi(value);
457 } else if (hard_timeout && !strcmp(name, "hard_timeout")) {
458 *hard_timeout = atoi(value);
459 } else if (cookie && !strcmp(name, "cookie")) {
460 *cookie = str_to_u64(value);
461 } else if (!strcmp(name, "tun_id_wild")) {
462 wildcards |= NXFW_TUN_ID;
463 } else if (parse_field(name, &f)) {
464 void *data = (char *) match + f->offset;
465 if (!strcmp(value, "*") || !strcmp(value, "ANY")) {
466 wildcards |= f->wildcard;
468 wildcards &= ~f->wildcard;
469 if (f->wildcard == OFPFW_IN_PORT
470 && parse_port_name(value, (uint16_t *) data)) {
472 } else if (f->type == F_U8) {
473 *(uint8_t *) data = str_to_u32(value);
474 } else if (f->type == F_U16) {
475 *(uint16_t *) data = htons(str_to_u32(value));
476 } else if (f->type == F_MAC) {
477 str_to_mac(value, data);
478 } else if (f->type == F_IP) {
479 wildcards |= str_to_ip(value, data) << f->shift;
485 ovs_fatal(0, "unknown keyword %s", name);
489 match->wildcards = htonl(wildcards);
492 normalize_match(&normalized);
493 if (memcmp(match, &normalized, sizeof normalized)) {
494 char *old = ofp_match_to_literal_string(match);
495 char *new = ofp_match_to_literal_string(&normalized);
496 VLOG_WARN("The specified flow is not in normal form:");
497 VLOG_WARN(" as specified: %s", old);
498 VLOG_WARN("as normalized: %s", new);