2 * Copyright (c) 2008, 2009, 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.
18 #include "xfif-provider.h"
28 #include "dynamic-string.h"
31 #include "xflow-util.h"
32 #include "ofp-print.h"
35 #include "poll-loop.h"
42 #define THIS_MODULE VLM_xfif
44 static const struct xfif_class *base_xfif_classes[] = {
49 struct registered_xfif_class {
50 struct xfif_class xfif_class;
53 static struct shash xfif_classes = SHASH_INITIALIZER(&xfif_classes);
55 /* Rate limit for individual messages going to or from the datapath, output at
56 * DBG level. This is very high because, if these are enabled, it is because
57 * we really need to see them. */
58 static struct vlog_rate_limit dpmsg_rl = VLOG_RATE_LIMIT_INIT(600, 600);
60 /* Not really much point in logging many xfif errors. */
61 static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5);
63 static void log_operation(const struct xfif *, const char *operation,
65 static void log_flow_operation(const struct xfif *, const char *operation,
66 int error, struct xflow_flow *flow);
67 static void log_flow_put(struct xfif *, int error,
68 const struct xflow_flow_put *);
69 static bool should_log_flow_message(int error);
70 static void check_rw_xflow_flow(struct xflow_flow *);
75 static int status = -1;
81 for (i = 0; i < ARRAY_SIZE(base_xfif_classes); i++) {
82 xf_register_provider(base_xfif_classes[i]);
87 /* Performs periodic work needed by all the various kinds of xfifs.
89 * If your program opens any xfifs, it must call both this function and
90 * netdev_run() within its main poll loop. */
94 struct shash_node *node;
95 SHASH_FOR_EACH(node, &xfif_classes) {
96 const struct registered_xfif_class *registered_class = node->data;
97 if (registered_class->xfif_class.run) {
98 registered_class->xfif_class.run();
103 /* Arranges for poll_block() to wake up when xf_run() needs to be called.
105 * If your program opens any xfifs, it must call both this function and
106 * netdev_wait() within its main poll loop. */
110 struct shash_node *node;
111 SHASH_FOR_EACH(node, &xfif_classes) {
112 const struct registered_xfif_class *registered_class = node->data;
113 if (registered_class->xfif_class.wait) {
114 registered_class->xfif_class.wait();
119 /* Registers a new datapath provider. After successful registration, new
120 * datapaths of that type can be opened using xfif_open(). */
122 xf_register_provider(const struct xfif_class *new_class)
124 struct registered_xfif_class *registered_class;
126 if (shash_find(&xfif_classes, new_class->type)) {
127 VLOG_WARN("attempted to register duplicate datapath provider: %s",
132 registered_class = xmalloc(sizeof *registered_class);
133 memcpy(®istered_class->xfif_class, new_class,
134 sizeof registered_class->xfif_class);
135 registered_class->refcount = 0;
137 shash_add(&xfif_classes, new_class->type, registered_class);
142 /* Unregisters a datapath provider. 'type' must have been previously
143 * registered and not currently be in use by any xfifs. After unregistration
144 * new datapaths of that type cannot be opened using xfif_open(). */
146 xf_unregister_provider(const char *type)
148 struct shash_node *node;
149 struct registered_xfif_class *registered_class;
151 node = shash_find(&xfif_classes, type);
153 VLOG_WARN("attempted to unregister a datapath provider that is not "
154 "registered: %s", type);
158 registered_class = node->data;
159 if (registered_class->refcount) {
160 VLOG_WARN("attempted to unregister in use datapath provider: %s", type);
164 shash_delete(&xfif_classes, node);
165 free(registered_class);
170 /* Clears 'types' and enumerates the types of all currently registered datapath
171 * providers into it. The caller must first initialize the svec. */
173 xf_enumerate_types(struct svec *types)
175 struct shash_node *node;
180 SHASH_FOR_EACH(node, &xfif_classes) {
181 const struct registered_xfif_class *registered_class = node->data;
182 svec_add(types, registered_class->xfif_class.type);
186 /* Clears 'names' and enumerates the names of all known created datapaths with
187 * the given 'type'. The caller must first initialize the svec. Returns 0 if
188 * successful, otherwise a positive errno value.
190 * Some kinds of datapaths might not be practically enumerable. This is not
191 * considered an error. */
193 xf_enumerate_names(const char *type, struct svec *names)
195 const struct registered_xfif_class *registered_class;
196 const struct xfif_class *xfif_class;
202 registered_class = shash_find_data(&xfif_classes, type);
203 if (!registered_class) {
204 VLOG_WARN("could not enumerate unknown type: %s", type);
208 xfif_class = ®istered_class->xfif_class;
209 error = xfif_class->enumerate ? xfif_class->enumerate(names) : 0;
212 VLOG_WARN("failed to enumerate %s datapaths: %s", xfif_class->type,
219 /* Parses 'datapath name', which is of the form type@name into its
220 * component pieces. 'name' and 'type' must be freed by the caller. */
222 xf_parse_name(const char *datapath_name_, char **name, char **type)
224 char *datapath_name = xstrdup(datapath_name_);
227 separator = strchr(datapath_name, '@');
230 *type = datapath_name;
231 *name = xstrdup(separator + 1);
233 *name = datapath_name;
239 do_open(const char *name, const char *type, bool create, struct xfif **xfifp)
241 struct xfif *xfif = NULL;
243 struct registered_xfif_class *registered_class;
247 if (!type || *type == '\0') {
251 registered_class = shash_find_data(&xfif_classes, type);
252 if (!registered_class) {
253 VLOG_WARN("could not create datapath %s of unknown type %s", name,
255 error = EAFNOSUPPORT;
259 error = registered_class->xfif_class.open(name, type, create, &xfif);
261 registered_class->refcount++;
265 *xfifp = error ? NULL : xfif;
269 /* Tries to open an existing datapath named 'name' and type 'type'. Will fail
270 * if no datapath with 'name' and 'type' exists. 'type' may be either NULL or
271 * the empty string to specify the default system type. Returns 0 if
272 * successful, otherwise a positive errno value. On success stores a pointer
273 * to the datapath in '*xfifp', otherwise a null pointer. */
275 xfif_open(const char *name, const char *type, struct xfif **xfifp)
277 return do_open(name, type, false, xfifp);
280 /* Tries to create and open a new datapath with the given 'name' and 'type'.
281 * 'type' may be either NULL or the empty string to specify the default system
282 * type. Will fail if a datapath with 'name' and 'type' already exists.
283 * Returns 0 if successful, otherwise a positive errno value. On success
284 * stores a pointer to the datapath in '*xfifp', otherwise a null pointer. */
286 xfif_create(const char *name, const char *type, struct xfif **xfifp)
288 return do_open(name, type, true, xfifp);
291 /* Tries to open a datapath with the given 'name' and 'type', creating it if it
292 * does not exist. 'type' may be either NULL or the empty string to specify
293 * the default system type. Returns 0 if successful, otherwise a positive
294 * errno value. On success stores a pointer to the datapath in '*xfifp',
295 * otherwise a null pointer. */
297 xfif_create_and_open(const char *name, const char *type, struct xfif **xfifp)
301 error = xfif_create(name, type, xfifp);
302 if (error == EEXIST || error == EBUSY) {
303 error = xfif_open(name, type, xfifp);
305 VLOG_WARN("datapath %s already exists but cannot be opened: %s",
306 name, strerror(error));
309 VLOG_WARN("failed to create datapath %s: %s", name, strerror(error));
314 /* Closes and frees the connection to 'xfif'. Does not destroy the datapath
315 * itself; call xfif_delete() first, instead, if that is desirable. */
317 xfif_close(struct xfif *xfif)
320 struct registered_xfif_class *registered_class;
322 registered_class = shash_find_data(&xfif_classes,
323 xfif->xfif_class->type);
324 assert(registered_class);
325 assert(registered_class->refcount);
327 registered_class->refcount--;
328 xfif_uninit(xfif, true);
332 /* Returns the name of datapath 'xfif' prefixed with the type
333 * (for use in log messages). */
335 xfif_name(const struct xfif *xfif)
337 return xfif->full_name;
340 /* Returns the name of datapath 'xfif' without the type
341 * (for use in device names). */
343 xfif_base_name(const struct xfif *xfif)
345 return xfif->base_name;
348 /* Enumerates all names that may be used to open 'xfif' into 'all_names'. The
349 * Linux datapath, for example, supports opening a datapath both by number,
350 * e.g. "dp0", and by the name of the datapath's local port. For some
351 * datapaths, this might be an infinite set (e.g. in a file name, slashes may
352 * be duplicated any number of times), in which case only the names most likely
353 * to be used will be enumerated.
355 * The caller must already have initialized 'all_names'. Any existing names in
356 * 'all_names' will not be disturbed. */
358 xfif_get_all_names(const struct xfif *xfif, struct svec *all_names)
360 if (xfif->xfif_class->get_all_names) {
361 int error = xfif->xfif_class->get_all_names(xfif, all_names);
363 VLOG_WARN_RL(&error_rl,
364 "failed to retrieve names for datpath %s: %s",
365 xfif_name(xfif), strerror(error));
369 svec_add(all_names, xfif_base_name(xfif));
374 /* Destroys the datapath that 'xfif' is connected to, first removing all of its
375 * ports. After calling this function, it does not make sense to pass 'xfif'
376 * to any functions other than xfif_name() or xfif_close(). */
378 xfif_delete(struct xfif *xfif)
382 COVERAGE_INC(xfif_destroy);
384 error = xfif->xfif_class->destroy(xfif);
385 log_operation(xfif, "delete", error);
389 /* Retrieves statistics for 'xfif' into 'stats'. Returns 0 if successful,
390 * otherwise a positive errno value. */
392 xfif_get_xf_stats(const struct xfif *xfif, struct xflow_stats *stats)
394 int error = xfif->xfif_class->get_stats(xfif, stats);
396 memset(stats, 0, sizeof *stats);
398 log_operation(xfif, "get_stats", error);
402 /* Retrieves the current IP fragment handling policy for 'xfif' into
403 * '*drop_frags': true indicates that fragments are dropped, false indicates
404 * that fragments are treated in the same way as other IP packets (except that
405 * the L4 header cannot be read). Returns 0 if successful, otherwise a
406 * positive errno value. */
408 xfif_get_drop_frags(const struct xfif *xfif, bool *drop_frags)
410 int error = xfif->xfif_class->get_drop_frags(xfif, drop_frags);
414 log_operation(xfif, "get_drop_frags", error);
418 /* Changes 'xfif''s treatment of IP fragments to 'drop_frags', whose meaning is
419 * the same as for the get_drop_frags member function. Returns 0 if
420 * successful, otherwise a positive errno value. */
422 xfif_set_drop_frags(struct xfif *xfif, bool drop_frags)
424 int error = xfif->xfif_class->set_drop_frags(xfif, drop_frags);
425 log_operation(xfif, "set_drop_frags", error);
429 /* Attempts to add 'devname' as a port on 'xfif', given the combination of
430 * XFLOW_PORT_* flags in 'flags'. If successful, returns 0 and sets '*port_nop'
431 * to the new port's port number (if 'port_nop' is non-null). On failure,
432 * returns a positive errno value and sets '*port_nop' to UINT16_MAX (if
433 * 'port_nop' is non-null). */
435 xfif_port_add(struct xfif *xfif, const char *devname, uint16_t flags,
441 COVERAGE_INC(xfif_port_add);
443 error = xfif->xfif_class->port_add(xfif, devname, flags, &port_no);
445 VLOG_DBG_RL(&dpmsg_rl, "%s: added %s as port %"PRIu16,
446 xfif_name(xfif), devname, port_no);
448 VLOG_WARN_RL(&error_rl, "%s: failed to add %s as port: %s",
449 xfif_name(xfif), devname, strerror(error));
450 port_no = UINT16_MAX;
458 /* Attempts to remove 'xfif''s port number 'port_no'. Returns 0 if successful,
459 * otherwise a positive errno value. */
461 xfif_port_del(struct xfif *xfif, uint16_t port_no)
465 COVERAGE_INC(xfif_port_del);
467 error = xfif->xfif_class->port_del(xfif, port_no);
468 log_operation(xfif, "port_del", error);
472 /* Looks up port number 'port_no' in 'xfif'. On success, returns 0 and
473 * initializes '*port' appropriately; on failure, returns a positive errno
476 xfif_port_query_by_number(const struct xfif *xfif, uint16_t port_no,
477 struct xflow_port *port)
479 int error = xfif->xfif_class->port_query_by_number(xfif, port_no, port);
481 VLOG_DBG_RL(&dpmsg_rl, "%s: port %"PRIu16" is device %s",
482 xfif_name(xfif), port_no, port->devname);
484 memset(port, 0, sizeof *port);
485 VLOG_WARN_RL(&error_rl, "%s: failed to query port %"PRIu16": %s",
486 xfif_name(xfif), port_no, strerror(error));
491 /* Looks up port named 'devname' in 'xfif'. On success, returns 0 and
492 * initializes '*port' appropriately; on failure, returns a positive errno
495 xfif_port_query_by_name(const struct xfif *xfif, const char *devname,
496 struct xflow_port *port)
498 int error = xfif->xfif_class->port_query_by_name(xfif, devname, port);
500 VLOG_DBG_RL(&dpmsg_rl, "%s: device %s is on port %"PRIu16,
501 xfif_name(xfif), devname, port->port);
503 memset(port, 0, sizeof *port);
505 /* Log level is DBG here because all the current callers are interested
506 * in whether 'xfif' actually has a port 'devname', so that it's not an
507 * issue worth logging if it doesn't. */
508 VLOG_DBG_RL(&error_rl, "%s: failed to query port %s: %s",
509 xfif_name(xfif), devname, strerror(error));
514 /* Looks up port number 'port_no' in 'xfif'. On success, returns 0 and copies
515 * the port's name into the 'name_size' bytes in 'name', ensuring that the
516 * result is null-terminated. On failure, returns a positive errno value and
517 * makes 'name' the empty string. */
519 xfif_port_get_name(struct xfif *xfif, uint16_t port_no,
520 char *name, size_t name_size)
522 struct xflow_port port;
525 assert(name_size > 0);
527 error = xfif_port_query_by_number(xfif, port_no, &port);
529 ovs_strlcpy(name, port.devname, name_size);
536 /* Obtains a list of all the ports in 'xfif'.
538 * If successful, returns 0 and sets '*portsp' to point to an array of
539 * appropriately initialized port structures and '*n_portsp' to the number of
540 * ports in the array. The caller is responsible for freeing '*portp' by
543 * On failure, returns a positive errno value and sets '*portsp' to NULL and
544 * '*n_portsp' to 0. */
546 xfif_port_list(const struct xfif *xfif,
547 struct xflow_port **portsp, size_t *n_portsp)
549 struct xflow_port *ports;
554 struct xflow_stats stats;
557 error = xfif_get_xf_stats(xfif, &stats);
562 ports = xcalloc(stats.n_ports, sizeof *ports);
563 retval = xfif->xfif_class->port_list(xfif, ports, stats.n_ports);
569 } else if (retval <= stats.n_ports) {
575 /* Soft error: port count increased behind our back. Try again. */
588 log_operation(xfif, "port_list", error);
592 /* Polls for changes in the set of ports in 'xfif'. If the set of ports in
593 * 'xfif' has changed, this function does one of the following:
595 * - Stores the name of the device that was added to or deleted from 'xfif' in
596 * '*devnamep' and returns 0. The caller is responsible for freeing
597 * '*devnamep' (with free()) when it no longer needs it.
599 * - Returns ENOBUFS and sets '*devnamep' to NULL.
601 * This function may also return 'false positives', where it returns 0 and
602 * '*devnamep' names a device that was not actually added or deleted or it
603 * returns ENOBUFS without any change.
605 * Returns EAGAIN if the set of ports in 'xfif' has not changed. May also
606 * return other positive errno values to indicate that something has gone
609 xfif_port_poll(const struct xfif *xfif, char **devnamep)
611 int error = xfif->xfif_class->port_poll(xfif, devnamep);
618 /* Arranges for the poll loop to wake up when port_poll(xfif) will return a
619 * value other than EAGAIN. */
621 xfif_port_poll_wait(const struct xfif *xfif)
623 xfif->xfif_class->port_poll_wait(xfif);
626 /* Retrieves a list of the port numbers in port group 'group' in 'xfif'.
628 * On success, returns 0 and points '*ports' to a newly allocated array of
629 * integers, each of which is a 'xfif' port number for a port in
630 * 'group'. Stores the number of elements in the array in '*n_ports'. The
631 * caller is responsible for freeing '*ports' by calling free().
633 * On failure, returns a positive errno value and sets '*ports' to NULL and
634 * '*n_ports' to 0. */
636 xfif_port_group_get(const struct xfif *xfif, uint16_t group,
637 uint16_t **ports, size_t *n_ports)
644 int retval = xfif->xfif_class->port_group_get(xfif, group,
653 } else if (retval <= *n_ports) {
659 /* Soft error: there were more ports than we expected in the
660 * group. Try again. */
662 *ports = xcalloc(retval, sizeof **ports);
666 log_operation(xfif, "port_group_get", error);
670 /* Updates port group 'group' in 'xfif', making it contain the 'n_ports' ports
671 * whose 'xfif' port numbers are given in 'n_ports'. Returns 0 if
672 * successful, otherwise a positive errno value.
674 * Behavior is undefined if the values in ports[] are not unique. */
676 xfif_port_group_set(struct xfif *xfif, uint16_t group,
677 const uint16_t ports[], size_t n_ports)
681 COVERAGE_INC(xfif_port_group_set);
683 error = xfif->xfif_class->port_group_set(xfif, group, ports, n_ports);
684 log_operation(xfif, "port_group_set", error);
688 /* Deletes all flows from 'xfif'. Returns 0 if successful, otherwise a
689 * positive errno value. */
691 xfif_flow_flush(struct xfif *xfif)
695 COVERAGE_INC(xfif_flow_flush);
697 error = xfif->xfif_class->flow_flush(xfif);
698 log_operation(xfif, "flow_flush", error);
702 /* Queries 'xfif' for a flow entry matching 'flow->key'.
704 * If a flow matching 'flow->key' exists in 'xfif', stores statistics for the
705 * flow into 'flow->stats'. If 'flow->n_actions' is zero, then 'flow->actions'
706 * is ignored. If 'flow->n_actions' is nonzero, then 'flow->actions' should
707 * point to an array of the specified number of actions. At most that many of
708 * the flow's actions will be copied into that array. 'flow->n_actions' will
709 * be updated to the number of actions actually present in the flow, which may
710 * be greater than the number stored if the flow has more actions than space
711 * available in the array.
713 * If no flow matching 'flow->key' exists in 'xfif', returns ENOENT. On other
714 * failure, returns a positive errno value. */
716 xfif_flow_get(const struct xfif *xfif, struct xflow_flow *flow)
720 COVERAGE_INC(xfif_flow_get);
722 check_rw_xflow_flow(flow);
723 error = xfif->xfif_class->flow_get(xfif, flow, 1);
725 error = flow->stats.error;
727 if (should_log_flow_message(error)) {
728 log_flow_operation(xfif, "flow_get", error, flow);
733 /* For each flow 'flow' in the 'n' flows in 'flows':
735 * - If a flow matching 'flow->key' exists in 'xfif':
737 * Stores 0 into 'flow->stats.error' and stores statistics for the flow
738 * into 'flow->stats'.
740 * If 'flow->n_actions' is zero, then 'flow->actions' is ignored. If
741 * 'flow->n_actions' is nonzero, then 'flow->actions' should point to an
742 * array of the specified number of actions. At most that many of the
743 * flow's actions will be copied into that array. 'flow->n_actions' will
744 * be updated to the number of actions actually present in the flow, which
745 * may be greater than the number stored if the flow has more actions than
746 * space available in the array.
748 * - Flow-specific errors are indicated by a positive errno value in
749 * 'flow->stats.error'. In particular, ENOENT indicates that no flow
750 * matching 'flow->key' exists in 'xfif'. When an error value is stored, the
751 * contents of 'flow->key' are preserved but other members of 'flow' should
752 * be treated as indeterminate.
754 * Returns 0 if all 'n' flows in 'flows' were updated (whether they were
755 * individually successful or not is indicated by 'flow->stats.error',
756 * however). Returns a positive errno value if an error that prevented this
757 * update occurred, in which the caller must not depend on any elements in
758 * 'flows' being updated or not updated.
761 xfif_flow_get_multiple(const struct xfif *xfif,
762 struct xflow_flow flows[], size_t n)
767 COVERAGE_ADD(xfif_flow_get, n);
769 for (i = 0; i < n; i++) {
770 check_rw_xflow_flow(&flows[i]);
773 error = xfif->xfif_class->flow_get(xfif, flows, n);
774 log_operation(xfif, "flow_get_multiple", error);
778 /* Adds or modifies a flow in 'xfif' as specified in 'put':
780 * - If the flow specified in 'put->flow' does not exist in 'xfif', then
781 * behavior depends on whether XFLOWPF_CREATE is specified in 'put->flags': if
782 * it is, the flow will be added, otherwise the operation will fail with
785 * - Otherwise, the flow specified in 'put->flow' does exist in 'xfif'.
786 * Behavior in this case depends on whether XFLOWPF_MODIFY is specified in
787 * 'put->flags': if it is, the flow's actions will be updated, otherwise the
788 * operation will fail with EEXIST. If the flow's actions are updated, then
789 * its statistics will be zeroed if XFLOWPF_ZERO_STATS is set in 'put->flags',
790 * left as-is otherwise.
792 * Returns 0 if successful, otherwise a positive errno value.
795 xfif_flow_put(struct xfif *xfif, struct xflow_flow_put *put)
799 COVERAGE_INC(xfif_flow_put);
801 error = xfif->xfif_class->flow_put(xfif, put);
802 if (should_log_flow_message(error)) {
803 log_flow_put(xfif, error, put);
808 /* Deletes a flow matching 'flow->key' from 'xfif' or returns ENOENT if 'xfif'
809 * does not contain such a flow.
811 * If successful, updates 'flow->stats', 'flow->n_actions', and 'flow->actions'
812 * as described for xfif_flow_get(). */
814 xfif_flow_del(struct xfif *xfif, struct xflow_flow *flow)
818 COVERAGE_INC(xfif_flow_del);
820 check_rw_xflow_flow(flow);
821 memset(&flow->stats, 0, sizeof flow->stats);
823 error = xfif->xfif_class->flow_del(xfif, flow);
824 if (should_log_flow_message(error)) {
825 log_flow_operation(xfif, "delete flow", error, flow);
830 /* Stores up to 'n' flows in 'xfif' into 'flows', including their statistics
831 * but not including any information about their actions. If successful,
832 * returns 0 and sets '*n_out' to the number of flows actually present in
833 * 'xfif', which might be greater than the number stored (if 'xfif' has more
834 * than 'n' flows). On failure, returns a negative errno value and sets
837 xfif_flow_list(const struct xfif *xfif, struct xflow_flow flows[], size_t n,
843 COVERAGE_INC(xfif_flow_query_list);
844 if (RUNNING_ON_VALGRIND) {
845 memset(flows, 0, n * sizeof *flows);
847 for (i = 0; i < n; i++) {
848 flows[i].actions = NULL;
849 flows[i].n_actions = 0;
852 retval = xfif->xfif_class->flow_list(xfif, flows, n);
855 VLOG_WARN_RL(&error_rl, "%s: flow list failed (%s)",
856 xfif_name(xfif), strerror(-retval));
859 COVERAGE_ADD(xfif_flow_query_list_n, retval);
860 *n_out = MIN(n, retval);
861 VLOG_DBG_RL(&dpmsg_rl, "%s: listed %zu flows (of %d)",
862 xfif_name(xfif), *n_out, retval);
867 /* Retrieves all of the flows in 'xfif'.
869 * If successful, returns 0 and stores in '*flowsp' a pointer to a newly
870 * allocated array of flows, including their statistics but not including any
871 * information about their actions, and sets '*np' to the number of flows in
872 * '*flowsp'. The caller is responsible for freeing '*flowsp' by calling
875 * On failure, returns a positive errno value and sets '*flowsp' to NULL and
878 xfif_flow_list_all(const struct xfif *xfif,
879 struct xflow_flow **flowsp, size_t *np)
881 struct xflow_stats stats;
882 struct xflow_flow *flows;
889 error = xfif_get_xf_stats(xfif, &stats);
894 flows = xmalloc(sizeof *flows * stats.n_flows);
895 error = xfif_flow_list(xfif, flows, stats.n_flows, &n_flows);
901 if (stats.n_flows != n_flows) {
902 VLOG_WARN_RL(&error_rl, "%s: datapath stats reported %"PRIu32" "
903 "flows but flow listing reported %zu",
904 xfif_name(xfif), stats.n_flows, n_flows);
911 /* Causes 'xfif' to perform the 'n_actions' actions in 'actions' on the
912 * Ethernet frame specified in 'packet'.
914 * Pretends that the frame was originally received on the port numbered
915 * 'in_port'. This affects only XFLOWAT_OUTPUT_GROUP actions, which will not
916 * send a packet out their input port. Specify the number of an unused port
917 * (e.g. UINT16_MAX is currently always unused) to avoid this behavior.
919 * Returns 0 if successful, otherwise a positive errno value. */
921 xfif_execute(struct xfif *xfif, uint16_t in_port,
922 const union xflow_action actions[], size_t n_actions,
923 const struct ofpbuf *buf)
927 COVERAGE_INC(xfif_execute);
929 error = xfif->xfif_class->execute(xfif, in_port, actions,
935 if (!(error ? VLOG_DROP_WARN(&error_rl) : VLOG_DROP_DBG(&dpmsg_rl))) {
936 struct ds ds = DS_EMPTY_INITIALIZER;
937 char *packet = ofp_packet_to_string(buf->data, buf->size, buf->size);
938 ds_put_format(&ds, "%s: execute ", xfif_name(xfif));
939 format_xflow_actions(&ds, actions, n_actions);
941 ds_put_format(&ds, " failed (%s)", strerror(error));
943 ds_put_format(&ds, " on packet %s", packet);
944 vlog(THIS_MODULE, error ? VLL_WARN : VLL_DBG, "%s", ds_cstr(&ds));
951 /* Retrieves 'xfif''s "listen mask" into '*listen_mask'. Each XFLOWL_* bit set
952 * in '*listen_mask' indicates that xfif_recv() will receive messages of that
953 * type. Returns 0 if successful, otherwise a positive errno value. */
955 xfif_recv_get_mask(const struct xfif *xfif, int *listen_mask)
957 int error = xfif->xfif_class->recv_get_mask(xfif, listen_mask);
961 log_operation(xfif, "recv_get_mask", error);
965 /* Sets 'xfif''s "listen mask" to 'listen_mask'. Each XFLOWL_* bit set in
966 * '*listen_mask' requests that xfif_recv() receive messages of that type.
967 * Returns 0 if successful, otherwise a positive errno value. */
969 xfif_recv_set_mask(struct xfif *xfif, int listen_mask)
971 int error = xfif->xfif_class->recv_set_mask(xfif, listen_mask);
972 log_operation(xfif, "recv_set_mask", error);
976 /* Retrieve the sFlow sampling probability. '*probability' is expressed as the
977 * number of packets out of UINT_MAX to sample, e.g. probability/UINT_MAX is
978 * the probability of sampling a given packet.
980 * Returns 0 if successful, otherwise a positive errno value. EOPNOTSUPP
981 * indicates that 'xfif' does not support sFlow sampling. */
983 xfif_get_sflow_probability(const struct xfif *xfif, uint32_t *probability)
985 int error = (xfif->xfif_class->get_sflow_probability
986 ? xfif->xfif_class->get_sflow_probability(xfif, probability)
991 log_operation(xfif, "get_sflow_probability", error);
995 /* Set the sFlow sampling probability. 'probability' is expressed as the
996 * number of packets out of UINT_MAX to sample, e.g. probability/UINT_MAX is
997 * the probability of sampling a given packet.
999 * Returns 0 if successful, otherwise a positive errno value. EOPNOTSUPP
1000 * indicates that 'xfif' does not support sFlow sampling. */
1002 xfif_set_sflow_probability(struct xfif *xfif, uint32_t probability)
1004 int error = (xfif->xfif_class->set_sflow_probability
1005 ? xfif->xfif_class->set_sflow_probability(xfif, probability)
1007 log_operation(xfif, "set_sflow_probability", error);
1011 /* Attempts to receive a message from 'xfif'. If successful, stores the
1012 * message into '*packetp'. The message, if one is received, will begin with
1013 * 'struct xflow_msg' as a header. Only messages of the types selected with
1014 * xfif_set_listen_mask() will ordinarily be received (but if a message type is
1015 * enabled and then later disabled, some stragglers might pop up).
1017 * Returns 0 if successful, otherwise a positive errno value. Returns EAGAIN
1018 * if no message is immediately available. */
1020 xfif_recv(struct xfif *xfif, struct ofpbuf **packetp)
1022 int error = xfif->xfif_class->recv(xfif, packetp);
1024 if (VLOG_IS_DBG_ENABLED()) {
1025 struct ofpbuf *buf = *packetp;
1026 struct xflow_msg *msg = buf->data;
1027 void *payload = msg + 1;
1028 size_t payload_len = buf->size - sizeof *msg;
1029 char *s = ofp_packet_to_string(payload, payload_len, payload_len);
1030 VLOG_DBG_RL(&dpmsg_rl, "%s: received %s message of length "
1031 "%zu on port %"PRIu16": %s", xfif_name(xfif),
1032 (msg->type == _XFLOWL_MISS_NR ? "miss"
1033 : msg->type == _XFLOWL_ACTION_NR ? "action"
1034 : msg->type == _XFLOWL_SFLOW_NR ? "sFlow"
1036 payload_len, msg->port, s);
1045 /* Discards all messages that would otherwise be received by xfif_recv() on
1046 * 'xfif'. Returns 0 if successful, otherwise a positive errno value. */
1048 xfif_recv_purge(struct xfif *xfif)
1050 struct xflow_stats stats;
1054 COVERAGE_INC(xfif_purge);
1056 error = xfif_get_xf_stats(xfif, &stats);
1061 for (i = 0; i < stats.max_miss_queue + stats.max_action_queue + stats.max_sflow_queue; i++) {
1063 error = xfif_recv(xfif, &buf);
1065 return error == EAGAIN ? 0 : error;
1072 /* Arranges for the poll loop to wake up when 'xfif' has a message queued to be
1073 * received with xfif_recv(). */
1075 xfif_recv_wait(struct xfif *xfif)
1077 xfif->xfif_class->recv_wait(xfif);
1080 /* Obtains the NetFlow engine type and engine ID for 'xfif' into '*engine_type'
1081 * and '*engine_id', respectively. */
1083 xfif_get_netflow_ids(const struct xfif *xfif,
1084 uint8_t *engine_type, uint8_t *engine_id)
1086 *engine_type = xfif->netflow_engine_type;
1087 *engine_id = xfif->netflow_engine_id;
1091 xfif_init(struct xfif *xfif, const struct xfif_class *xfif_class,
1093 uint8_t netflow_engine_type, uint8_t netflow_engine_id)
1095 xfif->xfif_class = xfif_class;
1096 xfif->base_name = xstrdup(name);
1097 xfif->full_name = xasprintf("%s@%s", xfif_class->type, name);
1098 xfif->netflow_engine_type = netflow_engine_type;
1099 xfif->netflow_engine_id = netflow_engine_id;
1102 /* Undoes the results of initialization.
1104 * Normally this function only needs to be called from xfif_close().
1105 * However, it may be called by providers due to an error on opening
1106 * that occurs after initialization. In this case xfif_close() would
1107 * never be called. */
1109 xfif_uninit(struct xfif *xfif, bool close)
1111 char *base_name = xfif->base_name;
1112 char *full_name = xfif->full_name;
1115 xfif->xfif_class->close(xfif);
1123 log_operation(const struct xfif *xfif, const char *operation, int error)
1126 VLOG_DBG_RL(&dpmsg_rl, "%s: %s success", xfif_name(xfif), operation);
1128 VLOG_WARN_RL(&error_rl, "%s: %s failed (%s)",
1129 xfif_name(xfif), operation, strerror(error));
1133 static enum vlog_level
1134 flow_message_log_level(int error)
1136 return error ? VLL_WARN : VLL_DBG;
1140 should_log_flow_message(int error)
1142 return !vlog_should_drop(THIS_MODULE, flow_message_log_level(error),
1143 error ? &error_rl : &dpmsg_rl);
1147 log_flow_message(const struct xfif *xfif, int error, const char *operation,
1148 const struct xflow_key *flow,
1149 const struct xflow_flow_stats *stats,
1150 const union xflow_action *actions, size_t n_actions)
1152 struct ds ds = DS_EMPTY_INITIALIZER;
1153 ds_put_format(&ds, "%s: ", xfif_name(xfif));
1155 ds_put_cstr(&ds, "failed to ");
1157 ds_put_format(&ds, "%s ", operation);
1159 ds_put_format(&ds, "(%s) ", strerror(error));
1161 format_xflow_key(&ds, flow);
1163 ds_put_cstr(&ds, ", ");
1164 format_xflow_flow_stats(&ds, stats);
1166 if (actions || n_actions) {
1167 ds_put_cstr(&ds, ", actions:");
1168 format_xflow_actions(&ds, actions, n_actions);
1170 vlog(THIS_MODULE, flow_message_log_level(error), "%s", ds_cstr(&ds));
1175 log_flow_operation(const struct xfif *xfif, const char *operation, int error,
1176 struct xflow_flow *flow)
1179 flow->n_actions = 0;
1181 log_flow_message(xfif, error, operation, &flow->key,
1182 !error ? &flow->stats : NULL,
1183 flow->actions, flow->n_actions);
1187 log_flow_put(struct xfif *xfif, int error, const struct xflow_flow_put *put)
1189 enum { XFLOWPF_ALL = XFLOWPF_CREATE | XFLOWPF_MODIFY | XFLOWPF_ZERO_STATS };
1193 ds_put_cstr(&s, "put");
1194 if (put->flags & XFLOWPF_CREATE) {
1195 ds_put_cstr(&s, "[create]");
1197 if (put->flags & XFLOWPF_MODIFY) {
1198 ds_put_cstr(&s, "[modify]");
1200 if (put->flags & XFLOWPF_ZERO_STATS) {
1201 ds_put_cstr(&s, "[zero]");
1203 if (put->flags & ~XFLOWPF_ALL) {
1204 ds_put_format(&s, "[%x]", put->flags & ~XFLOWPF_ALL);
1206 log_flow_message(xfif, error, ds_cstr(&s), &put->flow.key,
1207 !error ? &put->flow.stats : NULL,
1208 put->flow.actions, put->flow.n_actions);
1212 /* There is a tendency to construct xflow_flow objects on the stack and to
1213 * forget to properly initialize their "actions" and "n_actions" members.
1214 * When this happens, we get memory corruption because the kernel
1215 * writes through the random pointer that is in the "actions" member.
1217 * This function attempts to combat the problem by:
1219 * - Forcing a segfault if "actions" points to an invalid region (instead
1220 * of just getting back EFAULT, which can be easily missed in the log).
1222 * - Storing a distinctive value that is likely to cause an
1223 * easy-to-identify error later if it is dereferenced, etc.
1225 * - Triggering a warning on uninitialized memory from Valgrind if
1226 * "actions" or "n_actions" was not initialized.
1229 check_rw_xflow_flow(struct xflow_flow *flow)
1231 if (flow->n_actions) {
1232 memset(&flow->actions[0], 0xcc, sizeof flow->actions[0]);