--- /dev/null
+/*
+ * Copyright (c) 2008, 2009 Nicira Networks.
+ *
+ * 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 "dpif.h"
+
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <net/if.h>
+#include <linux/ethtool.h>
+#include <linux/sockios.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include "dpif-provider.h"
+#include "ofpbuf.h"
+#include "poll-loop.h"
+#include "util.h"
+
+#include "vlog.h"
+#define THIS_MODULE VLM_dpif_linux
+
+/* Datapath interface for the openvswitch Linux kernel module. */
+struct dpif_linux {
+ struct dpif dpif;
+ int fd;
+};
+
+static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5);
+
+static int do_ioctl(const struct dpif *, int cmd, const void *arg);
+static int lookup_minor(const char *name, int *minor);
+static int create_minor(const char *name, int minor, struct dpif **dpifp);
+static int open_minor(int minor, struct dpif **dpifp);
+static int make_openvswitch_device(int minor, char **fnp);
+
+static struct dpif_linux *
+dpif_linux_cast(const struct dpif *dpif)
+{
+ dpif_assert_class(dpif, &dpif_linux_class);
+ return CONTAINER_OF(dpif, struct dpif_linux, dpif);
+}
+
+static int
+dpif_linux_open(const char *name UNUSED, char *suffix, bool create,
+ struct dpif **dpifp)
+{
+ int minor;
+
+ minor = !strncmp(name, "dp", 2) && isdigit(name[2]) ? atoi(name + 2) : -1;
+ if (create) {
+ if (minor >= 0) {
+ return create_minor(suffix, minor, dpifp);
+ } else {
+ /* Scan for unused minor number. */
+ for (minor = 0; minor < ODP_MAX; minor++) {
+ int error = create_minor(suffix, minor, dpifp);
+ if (error != EBUSY) {
+ return error;
+ }
+ }
+
+ /* All datapath numbers in use. */
+ return ENOBUFS;
+ }
+ } else {
+ struct dpif_linux *dpif;
+ int listen_mask;
+ int error;
+
+ if (minor < 0) {
+ error = lookup_minor(suffix, &minor);
+ if (error) {
+ return error;
+ }
+ }
+
+ error = open_minor(minor, dpifp);
+ if (error) {
+ return error;
+ }
+ dpif = dpif_linux_cast(*dpifp);
+
+ /* We can open the device, but that doesn't mean that it's been
+ * created. If it hasn't been, then any command other than
+ * ODP_DP_CREATE will return ENODEV. Try something innocuous. */
+ listen_mask = 0; /* Make Valgrind happy. */
+ error = do_ioctl(*dpifp, ODP_GET_LISTEN_MASK, &listen_mask);
+ if (error) {
+ if (error != ENODEV) {
+ VLOG_WARN("%s: probe returned unexpected error: %s",
+ dpif_name(*dpifp), strerror(error));
+ }
+ dpif_close(*dpifp);
+ }
+ return error;
+ }
+}
+
+static void
+dpif_linux_close(struct dpif *dpif_)
+{
+ struct dpif_linux *dpif = dpif_linux_cast(dpif_);
+ close(dpif->fd);
+ free(dpif);
+}
+
+static int
+dpif_linux_delete(struct dpif *dpif_)
+{
+ return do_ioctl(dpif_, ODP_DP_DESTROY, NULL);
+}
+
+static int
+dpif_linux_get_stats(const struct dpif *dpif_, struct odp_stats *stats)
+{
+ return do_ioctl(dpif_, ODP_DP_STATS, stats);
+}
+
+static int
+dpif_linux_get_drop_frags(const struct dpif *dpif_, bool *drop_fragsp)
+{
+ int drop_frags;
+ int error;
+
+ error = do_ioctl(dpif_, ODP_GET_DROP_FRAGS, &drop_frags);
+ if (!error) {
+ *drop_fragsp = drop_frags & 1;
+ }
+ return error;
+}
+
+static int
+dpif_linux_set_drop_frags(struct dpif *dpif_, bool drop_frags)
+{
+ int drop_frags_int = drop_frags;
+ return do_ioctl(dpif_, ODP_SET_DROP_FRAGS, &drop_frags_int);
+}
+
+static int
+dpif_linux_port_add(struct dpif *dpif_, const char *devname, uint16_t flags,
+ uint16_t *port_no)
+{
+ struct odp_port port;
+ int error;
+
+ memset(&port, 0, sizeof port);
+ strncpy(port.devname, devname, sizeof port.devname);
+ port.flags = flags;
+ error = do_ioctl(dpif_, ODP_PORT_ADD, &port);
+ if (!error) {
+ *port_no = port.port;
+ }
+ return error;
+}
+
+static int
+dpif_linux_port_del(struct dpif *dpif_, uint16_t port_no)
+{
+ int tmp = port_no;
+ return do_ioctl(dpif_, ODP_PORT_DEL, &tmp);
+}
+
+static int
+dpif_linux_port_query_by_number(const struct dpif *dpif_, uint16_t port_no,
+ struct odp_port *port)
+{
+ memset(port, 0, sizeof *port);
+ port->port = port_no;
+ return do_ioctl(dpif_, ODP_PORT_QUERY, port);
+}
+
+static int
+dpif_linux_port_query_by_name(const struct dpif *dpif_, const char *devname,
+ struct odp_port *port)
+{
+ memset(port, 0, sizeof *port);
+ strncpy(port->devname, devname, sizeof port->devname);
+ return do_ioctl(dpif_, ODP_PORT_QUERY, port);
+}
+
+static int
+dpif_linux_flow_flush(struct dpif *dpif_)
+{
+ return do_ioctl(dpif_, ODP_FLOW_FLUSH, NULL);
+}
+
+static int
+dpif_linux_port_list(const struct dpif *dpif_, struct odp_port *ports, int n)
+{
+ struct odp_portvec pv;
+ int error;
+
+ pv.ports = ports;
+ pv.n_ports = n;
+ error = do_ioctl(dpif_, ODP_PORT_LIST, &pv);
+ return error ? -error : pv.n_ports;
+}
+
+static int
+dpif_linux_port_group_get(const struct dpif *dpif_, int group,
+ uint16_t ports[], int n)
+{
+ struct odp_port_group pg;
+ int error;
+
+ assert(n <= UINT16_MAX);
+ pg.group = group;
+ pg.ports = ports;
+ pg.n_ports = n;
+ error = do_ioctl(dpif_, ODP_PORT_GROUP_GET, &pg);
+ return error ? -error : pg.n_ports;
+}
+
+static int
+dpif_linux_port_group_set(struct dpif *dpif_, int group,
+ const uint16_t ports[], int n)
+{
+ struct odp_port_group pg;
+
+ assert(n <= UINT16_MAX);
+ pg.group = group;
+ pg.ports = (uint16_t *) ports;
+ pg.n_ports = n;
+ return do_ioctl(dpif_, ODP_PORT_GROUP_SET, &pg);
+}
+
+static int
+dpif_linux_flow_get(const struct dpif *dpif_, struct odp_flow flows[], int n)
+{
+ struct odp_flowvec fv;
+ fv.flows = flows;
+ fv.n_flows = n;
+ return do_ioctl(dpif_, ODP_FLOW_GET, &fv);
+}
+
+static int
+dpif_linux_flow_put(struct dpif *dpif_, struct odp_flow_put *put)
+{
+ return do_ioctl(dpif_, ODP_FLOW_PUT, put);
+}
+
+static int
+dpif_linux_flow_del(struct dpif *dpif_, struct odp_flow *flow)
+{
+ return do_ioctl(dpif_, ODP_FLOW_DEL, flow);
+}
+
+static int
+dpif_linux_flow_list(const struct dpif *dpif_, struct odp_flow flows[], int n)
+{
+ struct odp_flowvec fv;
+ int error;
+
+ fv.flows = flows;
+ fv.n_flows = n;
+ error = do_ioctl(dpif_, ODP_FLOW_LIST, &fv);
+ return error ? -error : fv.n_flows;
+}
+
+static int
+dpif_linux_execute(struct dpif *dpif_, uint16_t in_port,
+ const union odp_action actions[], int n_actions,
+ const struct ofpbuf *buf)
+{
+ struct odp_execute execute;
+ memset(&execute, 0, sizeof execute);
+ execute.in_port = in_port;
+ execute.actions = (union odp_action *) actions;
+ execute.n_actions = n_actions;
+ execute.data = buf->data;
+ execute.length = buf->size;
+ return do_ioctl(dpif_, ODP_EXECUTE, &execute);
+}
+
+static int
+dpif_linux_recv_get_mask(const struct dpif *dpif_, int *listen_mask)
+{
+ return do_ioctl(dpif_, ODP_GET_LISTEN_MASK, listen_mask);
+}
+
+static int
+dpif_linux_recv_set_mask(struct dpif *dpif_, int listen_mask)
+{
+ return do_ioctl(dpif_, ODP_SET_LISTEN_MASK, &listen_mask);
+}
+
+static int
+dpif_linux_recv(struct dpif *dpif_, struct ofpbuf **bufp)
+{
+ struct dpif_linux *dpif = dpif_linux_cast(dpif_);
+ struct ofpbuf *buf;
+ int retval;
+ int error;
+
+ buf = ofpbuf_new(65536);
+ retval = read(dpif->fd, ofpbuf_tail(buf), ofpbuf_tailroom(buf));
+ if (retval < 0) {
+ error = errno;
+ if (error != EAGAIN) {
+ VLOG_WARN_RL(&error_rl, "%s: read failed: %s",
+ dpif_name(dpif_), strerror(error));
+ }
+ } else if (retval >= sizeof(struct odp_msg)) {
+ struct odp_msg *msg = buf->data;
+ if (msg->length <= retval) {
+ buf->size += retval;
+ *bufp = buf;
+ return 0;
+ } else {
+ VLOG_WARN_RL(&error_rl, "%s: discarding message truncated "
+ "from %zu bytes to %d",
+ dpif_name(dpif_), msg->length, retval);
+ error = ERANGE;
+ }
+ } else if (!retval) {
+ VLOG_WARN_RL(&error_rl, "%s: unexpected end of file", dpif_name(dpif_));
+ error = EPROTO;
+ } else {
+ VLOG_WARN_RL(&error_rl,
+ "%s: discarding too-short message (%d bytes)",
+ dpif_name(dpif_), retval);
+ error = ERANGE;
+ }
+
+ *bufp = NULL;
+ ofpbuf_delete(buf);
+ return error;
+}
+
+static void
+dpif_linux_recv_wait(struct dpif *dpif_)
+{
+ struct dpif_linux *dpif = dpif_linux_cast(dpif_);
+ poll_fd_wait(dpif->fd, POLLIN);
+}
+
+const struct dpif_class dpif_linux_class = {
+ "", /* This is the default class. */
+ "linux",
+ dpif_linux_open,
+ dpif_linux_close,
+ dpif_linux_delete,
+ dpif_linux_get_stats,
+ dpif_linux_get_drop_frags,
+ dpif_linux_set_drop_frags,
+ dpif_linux_port_add,
+ dpif_linux_port_del,
+ dpif_linux_port_query_by_number,
+ dpif_linux_port_query_by_name,
+ dpif_linux_port_list,
+ dpif_linux_port_group_get,
+ dpif_linux_port_group_set,
+ dpif_linux_flow_get,
+ dpif_linux_flow_put,
+ dpif_linux_flow_del,
+ dpif_linux_flow_flush,
+ dpif_linux_flow_list,
+ dpif_linux_execute,
+ dpif_linux_recv_get_mask,
+ dpif_linux_recv_set_mask,
+ dpif_linux_recv,
+ dpif_linux_recv_wait,
+};
+\f
+static int get_openvswitch_major(void);
+static int get_major(const char *target, int default_major);
+
+static int
+do_ioctl(const struct dpif *dpif_, int cmd, const void *arg)
+{
+ struct dpif_linux *dpif = dpif_linux_cast(dpif_);
+ return ioctl(dpif->fd, cmd, arg) ? errno : 0;
+}
+
+static int
+lookup_minor(const char *name, int *minor)
+{
+ struct ethtool_drvinfo drvinfo;
+ struct ifreq ifr;
+ int error;
+ int sock;
+
+ sock = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock < 0) {
+ VLOG_WARN("socket(AF_INET) failed: %s", strerror(errno));
+ error = errno;
+ goto error;
+ }
+
+ memset(&ifr, 0, sizeof ifr);
+ strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
+ ifr.ifr_data = (caddr_t) &drvinfo;
+
+ memset(&drvinfo, 0, sizeof drvinfo);
+ drvinfo.cmd = ETHTOOL_GDRVINFO;
+ if (ioctl(sock, SIOCETHTOOL, &ifr)) {
+ VLOG_WARN("ioctl(SIOCETHTOOL) failed: %s", strerror(errno));
+ error = errno;
+ goto error_close_sock;
+ }
+
+ if (strcmp(drvinfo.driver, "openvswitch")) {
+ VLOG_WARN("%s is not an openvswitch device", name);
+ error = EOPNOTSUPP;
+ goto error_close_sock;
+ }
+
+ if (!isdigit(drvinfo.bus_info[0])) {
+ VLOG_WARN("%s ethtool info does not contain an openvswitch minor",
+ name);
+ error = EPROTOTYPE;
+ goto error_close_sock;
+ }
+
+ *minor = atoi(drvinfo.bus_info);
+ close(sock);
+ return 0;
+
+error_close_sock:
+ close(sock);
+error:
+ return error;
+}
+
+static int
+make_openvswitch_device(int minor, char **fnp)
+{
+ dev_t dev = makedev(get_openvswitch_major(), minor);
+ const char dirname[] = "/dev/net";
+ struct stat s;
+ char fn[128];
+
+ *fnp = NULL;
+ sprintf(fn, "%s/dp%d", dirname, minor);
+ if (!stat(fn, &s)) {
+ if (!S_ISCHR(s.st_mode)) {
+ VLOG_WARN_RL(&error_rl, "%s is not a character device, fixing",
+ fn);
+ } else if (s.st_rdev != dev) {
+ VLOG_WARN_RL(&error_rl,
+ "%s is device %u:%u instead of %u:%u, fixing",
+ fn, major(s.st_rdev), minor(s.st_rdev),
+ major(dev), minor(dev));
+ } else {
+ goto success;
+ }
+ if (unlink(fn)) {
+ VLOG_WARN_RL(&error_rl, "%s: unlink failed (%s)",
+ fn, strerror(errno));
+ return errno;
+ }
+ } else if (errno == ENOENT) {
+ if (stat(dirname, &s)) {
+ if (errno == ENOENT) {
+ if (mkdir(dirname, 0755)) {
+ VLOG_WARN_RL(&error_rl, "%s: mkdir failed (%s)",
+ dirname, strerror(errno));
+ return errno;
+ }
+ } else {
+ VLOG_WARN_RL(&error_rl, "%s: stat failed (%s)",
+ dirname, strerror(errno));
+ return errno;
+ }
+ }
+ } else {
+ VLOG_WARN_RL(&error_rl, "%s: stat failed (%s)", fn, strerror(errno));
+ return errno;
+ }
+
+ /* The device needs to be created. */
+ if (mknod(fn, S_IFCHR | 0700, dev)) {
+ VLOG_WARN_RL(&error_rl,
+ "%s: creating character device %u:%u failed (%s)",
+ fn, major(dev), minor(dev), strerror(errno));
+ return errno;
+ }
+
+success:
+ *fnp = xstrdup(fn);
+ return 0;
+}
+
+
+static int
+get_openvswitch_major(void)
+{
+ static unsigned int openvswitch_major;
+ if (!openvswitch_major) {
+ enum { DEFAULT_MAJOR = 248 };
+ openvswitch_major = get_major("openvswitch", DEFAULT_MAJOR);
+ }
+ return openvswitch_major;
+}
+
+static int
+get_major(const char *target, int default_major)
+{
+ const char fn[] = "/proc/devices";
+ char line[128];
+ FILE *file;
+ int ln;
+
+ file = fopen(fn, "r");
+ if (!file) {
+ VLOG_ERR("opening %s failed (%s)", fn, strerror(errno));
+ goto error;
+ }
+
+ for (ln = 1; fgets(line, sizeof line, file); ln++) {
+ char name[64];
+ int major;
+
+ if (!strncmp(line, "Character", 9) || line[0] == '\0') {
+ /* Nothing to do. */
+ } else if (!strncmp(line, "Block", 5)) {
+ /* We only want character devices, so skip the rest of the file. */
+ break;
+ } else if (sscanf(line, "%d %63s", &major, name)) {
+ if (!strcmp(name, target)) {
+ fclose(file);
+ return major;
+ }
+ } else {
+ static bool warned;
+ if (!warned) {
+ VLOG_WARN("%s:%d: syntax error", fn, ln);
+ }
+ warned = true;
+ }
+ }
+
+ VLOG_ERR("%s: %s major not found (is the module loaded?), using "
+ "default major %d", fn, target, default_major);
+error:
+ VLOG_INFO("using default major %d for %s", default_major, target);
+ return default_major;
+}
+
+static int
+create_minor(const char *name, int minor, struct dpif **dpifp)
+{
+ int error = open_minor(minor, dpifp);
+ if (!error) {
+ error = do_ioctl(*dpifp, ODP_DP_CREATE, name);
+ if (error) {
+ dpif_close(*dpifp);
+ }
+ }
+ return error;
+}
+
+static int
+open_minor(int minor, struct dpif **dpifp)
+{
+ int error;
+ char *fn;
+ int fd;
+
+ error = make_openvswitch_device(minor, &fn);
+ if (error) {
+ return error;
+ }
+
+ fd = open(fn, O_RDONLY | O_NONBLOCK);
+ if (fd >= 0) {
+ struct dpif_linux *dpif;
+ char *name;
+
+ name = xasprintf("dp%d", minor);
+
+ dpif = xmalloc(sizeof *dpif);
+ dpif_init(&dpif->dpif, &dpif_linux_class, name, minor, minor);
+ dpif->fd = fd;
+ *dpifp = &dpif->dpif;
+
+ free(name);
+ } else {
+ error = errno;
+ VLOG_WARN("%s: open failed (%s)", fn, strerror(error));
+ }
+ free(fn);
+
+ return error;
+}
--- /dev/null
+/*
+ * Copyright (c) 2009 Nicira Networks.
+ *
+ * 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.
+ */
+
+#ifndef DPIF_PROVIDER_H
+#define DPIF_PROVIDER_H 1
+
+/* Provider interface to dpifs, which provide an interface to an Open vSwitch
+ * datapath. */
+
+#include <assert.h>
+#include "dpif.h"
+
+/* Open vSwitch datapath interface.
+ *
+ * This structure should be treated as opaque by dpif implementations. */
+struct dpif {
+ const struct dpif_class *class;
+ char *name;
+ uint8_t netflow_engine_type;
+ uint8_t netflow_engine_id;
+};
+
+void dpif_init(struct dpif *, const struct dpif_class *, const char *name,
+ uint8_t netflow_engine_type, uint8_t netflow_engine_id);
+static inline void dpif_assert_class(const struct dpif *dpif,
+ const struct dpif_class *class)
+{
+ assert(dpif->class == class);
+}
+
+/* Datapath interface class structure, to be defined by each implementation of
+ * a datapath interface
+ *
+ * These functions return 0 if successful or a positive errno value on failure,
+ * except where otherwise noted.
+ *
+ * These functions are expected to execute synchronously, that is, to block as
+ * necessary to obtain a result. Thus, they may not return EAGAIN or
+ * EWOULDBLOCK or EINPROGRESS. We may relax this requirement in the future if
+ * and when we encounter performance problems. */
+struct dpif_class {
+ /* Prefix for names of dpifs in this class, e.g. "udatapath:".
+ *
+ * One dpif class may have the empty string "" as its prefix, in which case
+ * that dpif class is associated with dpif names that don't match any other
+ * class name. */
+ const char *prefix;
+
+ /* Class name, for use in error messages. */
+ const char *name;
+
+ /* Attempts to open an existing dpif, if 'create' is false, or to open an
+ * existing dpif or create a new one, if 'create' is true. 'name' is the
+ * full dpif name provided by the user, e.g. "udatapath:/var/run/mypath".
+ * This name is useful for error messages but must not be modified.
+ *
+ * 'suffix' is a copy of 'name' following the dpif's 'prefix'.
+ *
+ * If successful, stores a pointer to the new dpif in '*dpifp'. On failure
+ * there are no requirements on what is stored in '*dpifp'. */
+ int (*open)(const char *name, char *suffix, bool create,
+ struct dpif **dpifp);
+
+ /* Closes 'dpif' and frees associated memory. */
+ void (*close)(struct dpif *dpif);
+
+ /* Attempts to destroy the dpif underlying 'dpif'.
+ *
+ * If successful, 'dpif' will not be used again except as an argument for
+ * the 'close' member function. */
+ int (*delete)(struct dpif *dpif);
+
+ /* Retrieves statistics for 'dpif' into 'stats'. */
+ int (*get_stats)(const struct dpif *dpif, struct odp_stats *stats);
+
+ /* Retrieves 'dpif''s current treatment of IP fragments into '*drop_frags':
+ * true indicates that fragments are dropped, false indicates that
+ * fragments are treated in the same way as other IP packets (except that
+ * the L4 header cannot be read). */
+ int (*get_drop_frags)(const struct dpif *dpif, bool *drop_frags);
+
+ /* Changes 'dpif''s treatment of IP fragments to 'drop_frags', whose
+ * meaning is the same as for the get_drop_frags member function. */
+ int (*set_drop_frags)(struct dpif *dpif, bool drop_frags);
+
+ /* Creates a new port in 'dpif' connected to network device 'devname'.
+ * 'flags' is a set of ODP_PORT_* flags. If successful, sets '*port_no'
+ * to the new port's port number. */
+ int (*port_add)(struct dpif *dpif, const char *devname, uint16_t flags,
+ uint16_t *port_no);
+
+ /* Removes port numbered 'port_no' from 'dpif'. */
+ int (*port_del)(struct dpif *dpif, uint16_t port_no);
+
+ /* Queries 'dpif' for a port with the given 'port_no' or 'devname'. Stores
+ * information about the port into '*port' if successful. */
+ int (*port_query_by_number)(const struct dpif *dpif, uint16_t port_no,
+ struct odp_port *port);
+ int (*port_query_by_name)(const struct dpif *dpif, const char *devname,
+ struct odp_port *port);
+
+ /* Stores in 'ports' information about up to 'n' ports attached to 'dpif',
+ * in no particular order. Returns the number of ports attached to 'dpif'
+ * (not the number stored), if successful, otherwise a negative errno
+ * value. */
+ int (*port_list)(const struct dpif *dpif, struct odp_port *ports, int n);
+
+ /* Stores in 'ports' the port numbers of up to 'n' ports that belong to
+ * 'group' in 'dpif'. Returns the number of ports in 'group' (not the
+ * number stored), if successful, otherwise a negative errno value. */
+ int (*port_group_get)(const struct dpif *dpif, int group,
+ uint16_t ports[], int n);
+
+ /* Changes port group 'group' in 'dpif' to consist of the 'n' ports whose
+ * numbers are given in 'ports'.
+ *
+ * Use the get_stats member function to obtain the number of supported port
+ * groups. */
+ int (*port_group_set)(struct dpif *dpif, int group,
+ const uint16_t ports[], int n);
+
+ /* For each flow 'flow' in the 'n' flows in 'flows':
+ *
+ * - If a flow matching 'flow->key' exists in 'dpif':
+ *
+ * Stores 0 into 'flow->stats.error' and stores statistics for the flow
+ * into 'flow->stats'.
+ *
+ * If 'flow->n_actions' is zero, then 'flow->actions' is ignored. If
+ * 'flow->n_actions' is nonzero, then 'flow->actions' should point to
+ * an array of the specified number of actions. At most that many of
+ * the flow's actions will be copied into that array.
+ * 'flow->n_actions' will be updated to the number of actions actually
+ * present in the flow, which may be greater than the number stored if
+ * the flow has more actions than space available in the array.
+ *
+ * - Flow-specific errors are indicated by a positive errno value in
+ * 'flow->stats.error'. In particular, ENOENT indicates that no flow
+ * matching 'flow->key' exists in 'dpif'. When an error value is stored,
+ * the contents of 'flow->key' are preserved but other members of 'flow'
+ * should be treated as indeterminate.
+ *
+ * Returns 0 if all 'n' flows in 'flows' were updated (whether they were
+ * individually successful or not is indicated by 'flow->stats.error',
+ * however). Returns a positive errno value if an error that prevented
+ * this update occurred, in which the caller must not depend on any
+ * elements in 'flows' being updated or not updated.
+ */
+ int (*flow_get)(const struct dpif *dpif, struct odp_flow flows[], int n);
+
+ /* Adds or modifies a flow in 'dpif' as specified in 'put':
+ *
+ * - If the flow specified in 'put->flow' does not exist in 'dpif', then
+ * behavior depends on whether ODPPF_CREATE is specified in 'put->flags':
+ * if it is, the flow will be added, otherwise the operation will fail
+ * with ENOENT.
+ *
+ * - Otherwise, the flow specified in 'put->flow' does exist in 'dpif'.
+ * Behavior in this case depends on whether ODPPF_MODIFY is specified in
+ * 'put->flags': if it is, the flow's actions will be updated, otherwise
+ * the operation will fail with EEXIST. If the flow's actions are
+ * updated, then its statistics will be zeroed if ODPPF_ZERO_STATS is set
+ * in 'put->flags', left as-is otherwise.
+ */
+ int (*flow_put)(struct dpif *dpif, struct odp_flow_put *put);
+
+ /* Deletes a flow matching 'flow->key' from 'dpif' or returns ENOENT if
+ * 'dpif' does not contain such a flow.
+ *
+ * If successful, updates 'flow->stats', 'flow->n_actions', and
+ * 'flow->actions' as described in more detail under the flow_get member
+ * function below. */
+ int (*flow_del)(struct dpif *dpif, struct odp_flow *flow);
+
+ /* Deletes all flows from 'dpif' and clears all of its queues of received
+ * packets. */
+ int (*flow_flush)(struct dpif *dpif);
+
+ /* Stores up to 'n' flows in 'dpif' into 'flows', updating their statistics
+ * and actions as described under the flow_get member function. If
+ * successful, returns the number of flows actually present in 'dpif',
+ * which might be greater than the number stored (if 'dpif' has more than
+ * 'n' flows). On failure, returns a negative errno value. */
+ int (*flow_list)(const struct dpif *dpif, struct odp_flow flows[], int n);
+
+ /* Performs the 'n_actions' actions in 'actions' on the Ethernet frame
+ * specified in 'packet'.
+ *
+ * Pretends that the frame was originally received on the port numbered
+ * 'in_port'. This affects only ODPAT_OUTPUT_GROUP actions, which will not
+ * send a packet out their input port. Specify the number of an unused
+ * port (e.g. UINT16_MAX is currently always unused) to avoid this
+ * behavior. */
+ int (*execute)(struct dpif *dpif, uint16_t in_port,
+ const union odp_action actions[], int n_actions,
+ const struct ofpbuf *packet);
+
+ /* Retrieves 'dpif''s "listen mask" into '*listen_mask'. Each ODPL_* bit
+ * set in '*listen_mask' indicates the 'dpif' will receive messages of the
+ * corresponding type when it calls the recv member function. */
+ int (*recv_get_mask)(const struct dpif *dpif, int *listen_mask);
+
+ /* Sets 'dpif''s "listen mask" to 'listen_mask'. Each ODPL_* bit set in
+ * 'listen_mask' indicates the 'dpif' will receive messages of the
+ * corresponding type when it calls the recv member function. */
+ int (*recv_set_mask)(struct dpif *dpif, int listen_mask);
+
+ /* Attempts to receive a message from 'dpif'. If successful, stores the
+ * message into '*packetp'. The message, if one is received, must begin
+ * with 'struct odp_msg' as a header. Only messages of the types selected
+ * with the set_listen_mask member function should be received.
+ *
+ * This function must not block. If no message is ready to be received
+ * when it is called, it should return EAGAIN without blocking. */
+ int (*recv)(struct dpif *dpif, struct ofpbuf **packetp);
+
+ /* Arranges for the poll loop to wake up when 'dpif' has a message queued
+ * to be received with the recv member function. */
+ void (*recv_wait)(struct dpif *dpif);
+};
+
+extern const struct dpif_class dpif_linux_class;
+
+#endif /* dpif-provider.h */
*/
#include <config.h>
-#include "dpif.h"
+#include "dpif-provider.h"
#include <assert.h>
#include <ctype.h>
#include <errno.h>
-#include <fcntl.h>
#include <inttypes.h>
-#include <net/if.h>
-#include <linux/rtnetlink.h>
-#include <linux/ethtool.h>
-#include <linux/sockios.h>
-#include <netinet/in.h>
#include <stdlib.h>
#include <string.h>
-#include <sys/ioctl.h>
-#include <sys/stat.h>
-#include <sys/sysmacros.h>
-#include <unistd.h>
#include "coverage.h"
#include "dynamic-string.h"
#include "vlog.h"
#define THIS_MODULE VLM_dpif
-/* A datapath interface. */
-struct dpif {
- char *name;
- unsigned int minor;
- int fd;
+static struct dpif_class *dpif_classes[] = {
+ &dpif_linux_class,
};
+enum { N_DPIF_CLASSES = ARRAY_SIZE(dpif_classes) };
/* Rate limit for individual messages going to or from the datapath, output at
* DBG level. This is very high because, if these are enabled, it is because
/* Not really much point in logging many dpif errors. */
static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5);
-static int get_minor_from_name(const char *name, unsigned int *minor);
-static int name_to_minor(const char *name, unsigned int *minor);
-static int lookup_minor(const char *name, unsigned int *minor);
-static int open_by_minor(unsigned int minor, struct dpif **dpifp);
-static int make_openvswitch_device(unsigned int minor, char **fnp);
+static void log_operation(const struct dpif *, const char *operation,
+ int error);
+static void log_flow_operation(const struct dpif *, const char *operation,
+ int error, struct odp_flow *flow);
+static void log_flow_put(struct dpif *, int error,
+ const struct odp_flow_put *);
+static bool should_log_flow_message(int error);
static void check_rw_odp_flow(struct odp_flow *);
-int
-dpif_open(const char *name, struct dpif **dpifp)
+static int
+do_open(const char *name_, bool create, struct dpif **dpifp)
{
- struct dpif *dpif;
- unsigned int minor;
- int listen_mask;
+ char *name = xstrdup(name_);
+ char *prefix, *suffix, *colon;
+ struct dpif *dpif = NULL;
int error;
+ int i;
- *dpifp = NULL;
-
- error = name_to_minor(name, &minor);
- if (error) {
- return error;
- }
-
- error = open_by_minor(minor, &dpif);
- if (error) {
- return error;
+ colon = strchr(name, ':');
+ if (colon) {
+ *colon = '\0';
+ prefix = name;
+ suffix = colon + 1;
+ } else {
+ prefix = "";
+ suffix = name;
}
- /* We can open the device, but that doesn't mean that it's been created.
- * If it hasn't been, then any command other than ODP_DP_CREATE will
- * return ENODEV. Try something innocuous. */
- listen_mask = 0; /* Make Valgrind happy. */
- if (ioctl(dpif->fd, ODP_GET_LISTEN_MASK, &listen_mask)) {
- error = errno;
- if (error != ENODEV) {
- VLOG_WARN("%s: probe returned unexpected error: %s",
- dpif_name(dpif), strerror(error));
+ for (i = 0; i < N_DPIF_CLASSES; i++) {
+ const struct dpif_class *class = dpif_classes[i];
+ if (!strcmp(prefix, class->prefix)) {
+ error = class->open(name_, suffix, create, &dpif);
+ goto exit;
}
- dpif_close(dpif);
- return error;
}
- *dpifp = dpif;
- return 0;
-}
+ error = EAFNOSUPPORT;
-void
-dpif_close(struct dpif *dpif)
-{
- if (dpif) {
- free(dpif->name);
- close(dpif->fd);
- free(dpif);
- }
+exit:
+ *dpifp = error ? NULL : dpif;
+ return error;
}
-static int
-do_ioctl(const struct dpif *dpif, int cmd, const char *cmd_name,
- const void *arg)
+/* Tries to open an existing datapath named 'name'. Will fail if no datapath
+ * named 'name' exists. Returns 0 if successful, otherwise a positive errno
+ * value. On success stores a pointer to the datapath in '*dpifp', otherwise a
+ * null pointer. */
+int
+dpif_open(const char *name, struct dpif **dpifp)
{
- int error = ioctl(dpif->fd, cmd, arg) ? errno : 0;
- if (cmd_name) {
- if (error) {
- VLOG_WARN_RL(&error_rl, "%s: ioctl(%s) failed (%s)",
- dpif_name(dpif), cmd_name, strerror(error));
- } else {
- VLOG_DBG_RL(&dpmsg_rl, "%s: ioctl(%s): success",
- dpif_name(dpif), cmd_name);
- }
- }
- return error;
+ return do_open(name, false, dpifp);
}
+/* Tries to create and open a new datapath with the given 'name'. Will fail if
+ * a datapath named 'name' already exists. Returns 0 if successful, otherwise
+ * a positive errno value. On success stores a pointer to the datapath in
+ * '*dpifp', otherwise a null pointer.*/
int
dpif_create(const char *name, struct dpif **dpifp)
{
- unsigned int minor;
- int error;
-
- *dpifp = NULL;
- if (!get_minor_from_name(name, &minor)) {
- /* Minor was specified in 'name', go ahead and create it. */
- struct dpif *dpif;
-
- error = open_by_minor(minor, &dpif);
- if (error) {
- return error;
- }
-
- error = ioctl(dpif->fd, ODP_DP_CREATE, name) < 0 ? errno : 0;
- if (!error) {
- *dpifp = dpif;
- } else {
- dpif_close(dpif);
- }
- return error;
- } else {
- for (minor = 0; minor < ODP_MAX; minor++) {
- struct dpif *dpif;
-
- error = open_by_minor(minor, &dpif);
- if (error) {
- return error;
- }
+ return do_open(name, true, dpifp);
+}
- error = ioctl(dpif->fd, ODP_DP_CREATE, name) < 0 ? errno : 0;
- if (!error) {
- *dpifp = dpif;
- return 0;
- }
- dpif_close(dpif);
- if (error != EBUSY) {
- return error;
- }
- }
- return ENOBUFS;
+/* Closes and frees the connection to 'dpif'. Does not destroy the datapath
+ * itself; call dpif_delete() first, instead, if that is desirable. */
+void
+dpif_close(struct dpif *dpif)
+{
+ if (dpif) {
+ char *name = dpif->name;
+ dpif->class->close(dpif);
+ free(name);
}
}
+/* Returns the name of datapath 'dpif' (for use in log messages). */
const char *
dpif_name(const struct dpif *dpif)
{
return dpif->name;
}
+/* Destroys the datapath that 'dpif' is connected to, first removing all of its
+ * ports. After calling this function, it does not make sense to pass 'dpif'
+ * to any functions other than dpif_name() or dpif_close(). */
int
dpif_delete(struct dpif *dpif)
{
+ int error;
+
COVERAGE_INC(dpif_destroy);
- return do_ioctl(dpif, ODP_DP_DESTROY, "ODP_DP_DESTROY", NULL);
+
+ error = dpif->class->delete(dpif);
+ log_operation(dpif, "delete", error);
+ return error;
}
+/* Retrieves statistics for 'dpif' into 'stats'. Returns 0 if successful,
+ * otherwise a positive errno value. */
int
dpif_get_dp_stats(const struct dpif *dpif, struct odp_stats *stats)
{
- memset(stats, 0, sizeof *stats);
- return do_ioctl(dpif, ODP_DP_STATS, "ODP_DP_STATS", stats);
+ int error = dpif->class->get_stats(dpif, stats);
+ if (error) {
+ memset(stats, 0, sizeof *stats);
+ }
+ log_operation(dpif, "get_stats", error);
+ return error;
}
+/* Retrieves the current IP fragment handling policy for 'dpif' into
+ * '*drop_frags': true indicates that fragments are dropped, false indicates
+ * that fragments are treated in the same way as other IP packets (except that
+ * the L4 header cannot be read). Returns 0 if successful, otherwise a
+ * positive errno value. */
int
dpif_get_drop_frags(const struct dpif *dpif, bool *drop_frags)
{
- int tmp;
- int error = do_ioctl(dpif, ODP_GET_DROP_FRAGS, "ODP_GET_DROP_FRAGS", &tmp);
- *drop_frags = error ? tmp & 1 : false;
+ int error = dpif->class->get_drop_frags(dpif, drop_frags);
+ if (error) {
+ *drop_frags = false;
+ }
+ log_operation(dpif, "get_drop_frags", error);
return error;
}
+/* Changes 'dpif''s treatment of IP fragments to 'drop_frags', whose meaning is
+ * the same as for the get_drop_frags member function. Returns 0 if
+ * successful, otherwise a positive errno value. */
int
dpif_set_drop_frags(struct dpif *dpif, bool drop_frags)
{
- int tmp = drop_frags;
- return do_ioctl(dpif, ODP_SET_DROP_FRAGS, "ODP_SET_DROP_FRAGS", &tmp);
-}
-
-int
-dpif_recv_purge(struct dpif *dpif)
-{
- struct odp_stats stats;
- unsigned int i;
- int error;
-
- COVERAGE_INC(dpif_purge);
-
- error = dpif_get_dp_stats(dpif, &stats);
- if (error) {
- return error;
- }
-
- for (i = 0; i < stats.max_miss_queue + stats.max_action_queue; i++) {
- struct ofpbuf *buf;
- error = dpif_recv(dpif, &buf);
- if (error) {
- return error == EAGAIN ? 0 : error;
- }
- ofpbuf_delete(buf);
- }
- return 0;
+ int error = dpif->class->set_drop_frags(dpif, drop_frags);
+ log_operation(dpif, "set_drop_frags", error);
+ return error;
}
+/* Attempts to add 'devname' as a port on 'dpif', given the combination of
+ * ODP_PORT_* flags in 'flags'. If successful, returns 0 and sets '*port_nop'
+ * to the new port's port number (if 'port_nop' is non-null). On failure,
+ * returns a positive errno value and sets '*port_nop' to UINT16_MAX (if
+ * 'port_nop' is non-null). */
int
dpif_port_add(struct dpif *dpif, const char *devname, uint16_t flags,
uint16_t *port_nop)
{
- struct odp_port port;
uint16_t port_no;
int error;
COVERAGE_INC(dpif_port_add);
- memset(&port, 0, sizeof port);
- strncpy(port.devname, devname, sizeof port.devname);
- port.flags = flags;
-
- error = do_ioctl(dpif, ODP_PORT_ADD, NULL, &port);
+ error = dpif->class->port_add(dpif, devname, flags, &port_no);
if (!error) {
- port_no = port.port;
VLOG_DBG_RL(&dpmsg_rl, "%s: added %s as port %"PRIu16,
dpif_name(dpif), devname, port_no);
} else {
- port_no = UINT16_MAX;
VLOG_WARN_RL(&error_rl, "%s: failed to add %s as port: %s",
- dpif_name(dpif), devname, strerror(errno));
+ dpif_name(dpif), devname, strerror(error));
+ port_no = UINT16_MAX;
}
if (port_nop) {
*port_nop = port_no;
return error;
}
+/* Attempts to remove 'dpif''s port number 'port_no'. Returns 0 if successful,
+ * otherwise a positive errno value. */
int
dpif_port_del(struct dpif *dpif, uint16_t port_no)
{
- int tmp = port_no;
+ int error;
+
COVERAGE_INC(dpif_port_del);
- return do_ioctl(dpif, ODP_PORT_DEL, "ODP_PORT_DEL", &tmp);
+
+ error = dpif->class->port_del(dpif, port_no);
+ log_operation(dpif, "port_del", error);
+ return error;
}
+/* Looks up port number 'port_no' in 'dpif'. On success, returns 0 and
+ * initializes '*port' appropriately; on failure, returns a positive errno
+ * value. */
int
dpif_port_query_by_number(const struct dpif *dpif, uint16_t port_no,
struct odp_port *port)
{
- memset(port, 0, sizeof *port);
- port->port = port_no;
- if (!ioctl(dpif->fd, ODP_PORT_QUERY, port)) {
+ int error = dpif->class->port_query_by_number(dpif, port_no, port);
+ if (!error) {
VLOG_DBG_RL(&dpmsg_rl, "%s: port %"PRIu16" is device %s",
dpif_name(dpif), port_no, port->devname);
- return 0;
} else {
+ memset(port, 0, sizeof *port);
VLOG_WARN_RL(&error_rl, "%s: failed to query port %"PRIu16": %s",
- dpif_name(dpif), port_no, strerror(errno));
- return errno;
+ dpif_name(dpif), port_no, strerror(error));
}
+ return error;
}
+/* Looks up port named 'devname' in 'dpif'. On success, returns 0 and
+ * initializes '*port' appropriately; on failure, returns a positive errno
+ * value. */
int
dpif_port_query_by_name(const struct dpif *dpif, const char *devname,
struct odp_port *port)
{
- memset(port, 0, sizeof *port);
- strncpy(port->devname, devname, sizeof port->devname);
- if (!ioctl(dpif->fd, ODP_PORT_QUERY, port)) {
+ int error = dpif->class->port_query_by_name(dpif, devname, port);
+ if (!error) {
VLOG_DBG_RL(&dpmsg_rl, "%s: device %s is on port %"PRIu16,
dpif_name(dpif), devname, port->port);
- return 0;
} else {
+ memset(port, 0, sizeof *port);
+
/* Log level is DBG here because all the current callers are interested
* in whether 'dpif' actually has a port 'devname', so that it's not an
* issue worth logging if it doesn't. */
VLOG_DBG_RL(&error_rl, "%s: failed to query port %s: %s",
- dpif_name(dpif), devname, strerror(errno));
- return errno;
+ dpif_name(dpif), devname, strerror(error));
}
+ return error;
}
+/* Looks up port number 'port_no' in 'dpif'. On success, returns 0 and copies
+ * the port's name into the 'name_size' bytes in 'name', ensuring that the
+ * result is null-terminated. On failure, returns a positive errno value and
+ * makes 'name' the empty string. */
int
dpif_port_get_name(struct dpif *dpif, uint16_t port_no,
char *name, size_t name_size)
return error;
}
+/* Obtains a list of all the ports in 'dpif'.
+ *
+ * If successful, returns 0 and sets '*portsp' to point to an array of
+ * appropriately initialized port structures and '*n_portsp' to the number of
+ * ports in the array. The caller is responsible for freeing '*portp' by
+ * calling free().
+ *
+ * On failure, returns a positive errno value and sets '*portsp' to NULL and
+ * '*n_portsp' to 0. */
int
dpif_port_list(const struct dpif *dpif,
struct odp_port **portsp, size_t *n_portsp)
for (;;) {
struct odp_stats stats;
- struct odp_portvec pv;
+ int retval;
error = dpif_get_dp_stats(dpif, &stats);
if (error) {
}
ports = xcalloc(stats.n_ports, sizeof *ports);
- pv.ports = ports;
- pv.n_ports = stats.n_ports;
- error = do_ioctl(dpif, ODP_PORT_LIST, "ODP_PORT_LIST", &pv);
- if (error) {
+ retval = dpif->class->port_list(dpif, ports, stats.n_ports);
+ if (retval < 0) {
/* Hard error. */
+ error = -retval;
free(ports);
goto exit;
- } else if (pv.n_ports <= stats.n_ports) {
+ } else if (retval <= stats.n_ports) {
/* Success. */
error = 0;
- n_ports = pv.n_ports;
+ n_ports = retval;
goto exit;
} else {
/* Soft error: port count increased behind our back. Try again. */
*portsp = ports;
*n_portsp = n_ports;
}
+ log_operation(dpif, "port_list", error);
return error;
}
-int
-dpif_port_group_set(struct dpif *dpif, uint16_t group,
- const uint16_t ports[], size_t n_ports)
-{
- struct odp_port_group pg;
-
- COVERAGE_INC(dpif_port_group_set);
- assert(n_ports <= UINT16_MAX);
- pg.group = group;
- pg.ports = (uint16_t *) ports;
- pg.n_ports = n_ports;
- return do_ioctl(dpif, ODP_PORT_GROUP_SET, "ODP_PORT_GROUP_SET", &pg);
-}
-
+/* Retrieves a list of the port numbers in port group 'group' in 'dpif'.
+ *
+ * On success, returns 0 and points '*ports' to a newly allocated array of
+ * integers, each of which is a 'dpif' port number for a port in
+ * 'group'. Stores the number of elements in the array in '*n_ports'. The
+ * caller is responsible for freeing '*ports' by calling free().
+ *
+ * On failure, returns a positive errno value and sets '*ports' to NULL and
+ * '*n_ports' to 0. */
int
dpif_port_group_get(const struct dpif *dpif, uint16_t group,
uint16_t **ports, size_t *n_ports)
*ports = NULL;
*n_ports = 0;
for (;;) {
- struct odp_port_group pg;
- pg.group = group;
- pg.ports = *ports;
- pg.n_ports = *n_ports;
-
- error = do_ioctl(dpif, ODP_PORT_GROUP_GET, "ODP_PORT_GROUP_GET", &pg);
- if (error) {
+ int retval = dpif->class->port_group_get(dpif, group,
+ *ports, *n_ports);
+ if (retval < 0) {
/* Hard error. */
+ error = -retval;
free(*ports);
*ports = NULL;
*n_ports = 0;
break;
- } else if (pg.n_ports <= *n_ports) {
+ } else if (retval <= *n_ports) {
/* Success. */
- *n_ports = pg.n_ports;
+ error = 0;
+ *n_ports = retval;
break;
} else {
/* Soft error: there were more ports than we expected in the
* group. Try again. */
free(*ports);
- *ports = xcalloc(pg.n_ports, sizeof **ports);
- *n_ports = pg.n_ports;
+ *ports = xcalloc(retval, sizeof **ports);
+ *n_ports = retval;
}
}
+ log_operation(dpif, "port_group_get", error);
return error;
}
+/* Updates port group 'group' in 'dpif', making it contain the 'n_ports' ports
+ * whose 'dpif' port numbers are given in 'n_ports'. Returns 0 if
+ * successful, otherwise a positive errno value.
+ *
+ * Behavior is undefined if the values in ports[] are not unique. */
int
-dpif_flow_flush(struct dpif *dpif)
+dpif_port_group_set(struct dpif *dpif, uint16_t group,
+ const uint16_t ports[], size_t n_ports)
{
- COVERAGE_INC(dpif_flow_flush);
- return do_ioctl(dpif, ODP_FLOW_FLUSH, "ODP_FLOW_FLUSH", NULL);
-}
+ int error;
-static enum vlog_level
-flow_message_log_level(int error)
-{
- return error ? VLL_WARN : VLL_DBG;
+ COVERAGE_INC(dpif_port_group_set);
+
+ error = dpif->class->port_group_set(dpif, group, ports, n_ports);
+ log_operation(dpif, "port_group_set", error);
+ return error;
}
-static bool
-should_log_flow_message(int error)
+/* Deletes all flows from 'dpif'. Returns 0 if successful, otherwise a
+ * positive errno value. */
+int
+dpif_flow_flush(struct dpif *dpif)
{
- return !vlog_should_drop(THIS_MODULE, flow_message_log_level(error),
- error ? &error_rl : &dpmsg_rl);
+ int error;
+
+ COVERAGE_INC(dpif_flow_flush);
+
+ error = dpif->class->flow_flush(dpif);
+ log_operation(dpif, "flow_flush", error);
+ return error;
}
-static void
-log_flow_message(const struct dpif *dpif, int error,
- const char *operation,
- const flow_t *flow, const struct odp_flow_stats *stats,
- const union odp_action *actions, size_t n_actions)
+/* Queries 'dpif' for a flow entry matching 'flow->key'.
+ *
+ * If a flow matching 'flow->key' exists in 'dpif', stores statistics for the
+ * flow into 'flow->stats'. If 'flow->n_actions' is zero, then 'flow->actions'
+ * is ignored. If 'flow->n_actions' is nonzero, then 'flow->actions' should
+ * point to an array of the specified number of actions. At most that many of
+ * the flow's actions will be copied into that array. 'flow->n_actions' will
+ * be updated to the number of actions actually present in the flow, which may
+ * be greater than the number stored if the flow has more actions than space
+ * available in the array.
+ *
+ * If no flow matching 'flow->key' exists in 'dpif', returns ENOENT. On other
+ * failure, returns a positive errno value. */
+int
+dpif_flow_get(const struct dpif *dpif, struct odp_flow *flow)
{
- struct ds ds = DS_EMPTY_INITIALIZER;
- ds_put_format(&ds, "%s: ", dpif_name(dpif));
- if (error) {
- ds_put_cstr(&ds, "failed to ");
- }
- ds_put_format(&ds, "%s ", operation);
- if (error) {
- ds_put_format(&ds, "(%s) ", strerror(error));
- }
- flow_format(&ds, flow);
- if (stats) {
- ds_put_cstr(&ds, ", ");
- format_odp_flow_stats(&ds, stats);
+ int error;
+
+ COVERAGE_INC(dpif_flow_get);
+
+ check_rw_odp_flow(flow);
+ error = dpif->class->flow_get(dpif, flow, 1);
+ if (!error) {
+ error = flow->stats.error;
}
- if (actions || n_actions) {
- ds_put_cstr(&ds, ", actions:");
- format_odp_actions(&ds, actions, n_actions);
+ if (should_log_flow_message(error)) {
+ log_flow_operation(dpif, "flow_get", error, flow);
}
- vlog(THIS_MODULE, flow_message_log_level(error), "%s", ds_cstr(&ds));
- ds_destroy(&ds);
+ return error;
}
-static int
-do_flow_ioctl(const struct dpif *dpif, int cmd, struct odp_flow *flow,
- const char *operation, bool show_stats)
+/* For each flow 'flow' in the 'n' flows in 'flows':
+ *
+ * - If a flow matching 'flow->key' exists in 'dpif':
+ *
+ * Stores 0 into 'flow->stats.error' and stores statistics for the flow
+ * into 'flow->stats'.
+ *
+ * If 'flow->n_actions' is zero, then 'flow->actions' is ignored. If
+ * 'flow->n_actions' is nonzero, then 'flow->actions' should point to an
+ * array of the specified number of actions. At most that many of the
+ * flow's actions will be copied into that array. 'flow->n_actions' will
+ * be updated to the number of actions actually present in the flow, which
+ * may be greater than the number stored if the flow has more actions than
+ * space available in the array.
+ *
+ * - Flow-specific errors are indicated by a positive errno value in
+ * 'flow->stats.error'. In particular, ENOENT indicates that no flow
+ * matching 'flow->key' exists in 'dpif'. When an error value is stored, the
+ * contents of 'flow->key' are preserved but other members of 'flow' should
+ * be treated as indeterminate.
+ *
+ * Returns 0 if all 'n' flows in 'flows' were updated (whether they were
+ * individually successful or not is indicated by 'flow->stats.error',
+ * however). Returns a positive errno value if an error that prevented this
+ * update occurred, in which the caller must not depend on any elements in
+ * 'flows' being updated or not updated.
+ */
+int
+dpif_flow_get_multiple(const struct dpif *dpif,
+ struct odp_flow flows[], size_t n)
{
- int error = do_ioctl(dpif, cmd, NULL, flow);
- if (error && show_stats) {
- flow->n_actions = 0;
- }
- if (should_log_flow_message(error)) {
- log_flow_message(dpif, error, operation, &flow->key,
- show_stats && !error ? &flow->stats : NULL,
- flow->actions, flow->n_actions);
+ int error;
+ size_t i;
+
+ COVERAGE_ADD(dpif_flow_get, n);
+
+ for (i = 0; i < n; i++) {
+ check_rw_odp_flow(&flows[i]);
}
+
+ error = dpif->class->flow_get(dpif, flows, n);
+ log_operation(dpif, "flow_get_multiple", error);
return error;
}
+/* Adds or modifies a flow in 'dpif' as specified in 'put':
+ *
+ * - If the flow specified in 'put->flow' does not exist in 'dpif', then
+ * behavior depends on whether ODPPF_CREATE is specified in 'put->flags': if
+ * it is, the flow will be added, otherwise the operation will fail with
+ * ENOENT.
+ *
+ * - Otherwise, the flow specified in 'put->flow' does exist in 'dpif'.
+ * Behavior in this case depends on whether ODPPF_MODIFY is specified in
+ * 'put->flags': if it is, the flow's actions will be updated, otherwise the
+ * operation will fail with EEXIST. If the flow's actions are updated, then
+ * its statistics will be zeroed if ODPPF_ZERO_STATS is set in 'put->flags',
+ * left as-is otherwise.
+ *
+ * Returns 0 if successful, otherwise a positive errno value.
+ */
int
dpif_flow_put(struct dpif *dpif, struct odp_flow_put *put)
{
- int error = do_ioctl(dpif, ODP_FLOW_PUT, NULL, put);
+ int error;
+
COVERAGE_INC(dpif_flow_put);
+
+ error = dpif->class->flow_put(dpif, put);
if (should_log_flow_message(error)) {
- struct ds operation = DS_EMPTY_INITIALIZER;
- ds_put_cstr(&operation, "put");
- if (put->flags & ODPPF_CREATE) {
- ds_put_cstr(&operation, "[create]");
- }
- if (put->flags & ODPPF_MODIFY) {
- ds_put_cstr(&operation, "[modify]");
- }
- if (put->flags & ODPPF_ZERO_STATS) {
- ds_put_cstr(&operation, "[zero]");
- }
-#define ODPPF_ALL (ODPPF_CREATE | ODPPF_MODIFY | ODPPF_ZERO_STATS)
- if (put->flags & ~ODPPF_ALL) {
- ds_put_format(&operation, "[%x]", put->flags & ~ODPPF_ALL);
- }
- log_flow_message(dpif, error, ds_cstr(&operation), &put->flow.key,
- !error ? &put->flow.stats : NULL,
- put->flow.actions, put->flow.n_actions);
- ds_destroy(&operation);
+ log_flow_put(dpif, error, put);
}
return error;
}
+/* Deletes a flow matching 'flow->key' from 'dpif' or returns ENOENT if 'dpif'
+ * does not contain such a flow.
+ *
+ * If successful, updates 'flow->stats', 'flow->n_actions', and 'flow->actions'
+ * as described for dpif_flow_get(). */
int
dpif_flow_del(struct dpif *dpif, struct odp_flow *flow)
{
- COVERAGE_INC(dpif_flow_del);
- check_rw_odp_flow(flow);
- memset(&flow->stats, 0, sizeof flow->stats);
- return do_flow_ioctl(dpif, ODP_FLOW_DEL, flow, "delete flow", true);
-}
-
-int
-dpif_flow_get(const struct dpif *dpif, struct odp_flow *flow)
-{
- struct odp_flowvec fv;
int error;
- COVERAGE_INC(dpif_flow_get);
+ COVERAGE_INC(dpif_flow_del);
check_rw_odp_flow(flow);
- fv.flows = flow;
- fv.n_flows = 1;
- error = do_ioctl(dpif, ODP_FLOW_GET, "ODP_FLOW_GET", &fv);
- if (!error) {
- error = flow->stats.error;
- if (error) {
- VLOG_WARN_RL(&error_rl, "%s: ioctl(ODP_FLOW_GET) failed (%s)",
- dpif_name(dpif), strerror(error));
- }
- }
- return error;
-}
-
-int
-dpif_flow_get_multiple(const struct dpif *dpif,
- struct odp_flow flows[], size_t n)
-{
- struct odp_flowvec fv;
- size_t i;
+ memset(&flow->stats, 0, sizeof flow->stats);
- COVERAGE_ADD(dpif_flow_query_multiple, n);
- fv.flows = flows;
- fv.n_flows = n;
- for (i = 0; i < n; i++) {
- check_rw_odp_flow(&flows[i]);
+ error = dpif->class->flow_del(dpif, flow);
+ if (should_log_flow_message(error)) {
+ log_flow_operation(dpif, "delete flow", error, flow);
}
- return do_ioctl(dpif, ODP_FLOW_GET, "ODP_FLOW_GET",
- &fv);
+ return error;
}
+/* Stores up to 'n' flows in 'dpif' into 'flows', including their statistics
+ * but not including any information about their actions. If successful,
+ * returns 0 and sets '*n_out' to the number of flows actually present in
+ * 'dpif', which might be greater than the number stored (if 'dpif' has more
+ * than 'n' flows). On failure, returns a negative errno value and sets
+ * '*n_out' to 0. */
int
dpif_flow_list(const struct dpif *dpif, struct odp_flow flows[], size_t n,
size_t *n_out)
{
- struct odp_flowvec fv;
uint32_t i;
- int error;
+ int retval;
COVERAGE_INC(dpif_flow_query_list);
- fv.flows = flows;
- fv.n_flows = n;
if (RUNNING_ON_VALGRIND) {
memset(flows, 0, n * sizeof *flows);
} else {
flows[i].n_actions = 0;
}
}
- error = do_ioctl(dpif, ODP_FLOW_LIST, NULL, &fv);
- if (error) {
+ retval = dpif->class->flow_list(dpif, flows, n);
+ if (retval < 0) {
*n_out = 0;
VLOG_WARN_RL(&error_rl, "%s: flow list failed (%s)",
- dpif_name(dpif), strerror(error));
+ dpif_name(dpif), strerror(-retval));
+ return -retval;
} else {
- COVERAGE_ADD(dpif_flow_query_list_n, fv.n_flows);
- *n_out = fv.n_flows;
- VLOG_DBG_RL(&dpmsg_rl, "%s: listed %zu flows",
- dpif_name(dpif), *n_out);
+ COVERAGE_ADD(dpif_flow_query_list_n, retval);
+ *n_out = MIN(n, retval);
+ VLOG_DBG_RL(&dpmsg_rl, "%s: listed %zu flows (of %d)",
+ dpif_name(dpif), *n_out, retval);
+ return 0;
}
- return error;
}
+/* Retrieves all of the flows in 'dpif'.
+ *
+ * If successful, returns 0 and stores in '*flowsp' a pointer to a newly
+ * allocated array of flows, including their statistics but not including any
+ * information about their actions, and sets '*np' to the number of flows in
+ * '*flowsp'. The caller is responsible for freeing '*flowsp' by calling
+ * free().
+ *
+ * On failure, returns a positive errno value and sets '*flowsp' to NULL and
+ * '*np' to 0. */
int
dpif_flow_list_all(const struct dpif *dpif,
struct odp_flow **flowsp, size_t *np)
return 0;
}
+/* Causes 'dpif' to perform the 'n_actions' actions in 'actions' on the
+ * Ethernet frame specified in 'packet'.
+ *
+ * Pretends that the frame was originally received on the port numbered
+ * 'in_port'. This affects only ODPAT_OUTPUT_GROUP actions, which will not
+ * send a packet out their input port. Specify the number of an unused port
+ * (e.g. UINT16_MAX is currently always unused) to avoid this behavior.
+ *
+ * Returns 0 if successful, otherwise a positive errno value. */
int
dpif_execute(struct dpif *dpif, uint16_t in_port,
const union odp_action actions[], size_t n_actions,
COVERAGE_INC(dpif_execute);
if (n_actions > 0) {
- struct odp_execute execute;
- memset(&execute, 0, sizeof execute);
- execute.in_port = in_port;
- execute.actions = (union odp_action *) actions;
- execute.n_actions = n_actions;
- execute.data = buf->data;
- execute.length = buf->size;
- error = do_ioctl(dpif, ODP_EXECUTE, NULL, &execute);
+ error = dpif->class->execute(dpif, in_port, actions, n_actions, buf);
} else {
error = 0;
}
return error;
}
+/* Retrieves 'dpif''s "listen mask" into '*listen_mask'. Each ODPL_* bit set
+ * in '*listen_mask' indicates that dpif_recv() will receive messages of that
+ * type. Returns 0 if successful, otherwise a positive errno value. */
int
dpif_recv_get_mask(const struct dpif *dpif, int *listen_mask)
{
- int error = do_ioctl(dpif, ODP_GET_LISTEN_MASK, "ODP_GET_LISTEN_MASK",
- listen_mask);
+ int error = dpif->class->recv_get_mask(dpif, listen_mask);
if (error) {
*listen_mask = 0;
}
+ log_operation(dpif, "recv_get_mask", error);
return error;
}
+/* Sets 'dpif''s "listen mask" to 'listen_mask'. Each ODPL_* bit set in
+ * '*listen_mask' requests that dpif_recv() receive messages of that type.
+ * Returns 0 if successful, otherwise a positive errno value. */
int
dpif_recv_set_mask(struct dpif *dpif, int listen_mask)
{
- return do_ioctl(dpif, ODP_SET_LISTEN_MASK, "ODP_SET_LISTEN_MASK",
- &listen_mask);
+ int error = dpif->class->recv_set_mask(dpif, listen_mask);
+ log_operation(dpif, "recv_set_mask", error);
+ return error;
}
+/* Attempts to receive a message from 'dpif'. If successful, stores the
+ * message into '*packetp'. The message, if one is received, will begin with
+ * 'struct odp_msg' as a header. Only messages of the types selected with
+ * dpif_set_listen_mask() will ordinarily be received (but if a message type is
+ * enabled and then later disabled, some stragglers might pop up).
+ *
+ * Returns 0 if successful, otherwise a positive errno value. Returns EAGAIN
+ * if no message is immediately available. */
int
-dpif_recv(struct dpif *dpif, struct ofpbuf **bufp)
+dpif_recv(struct dpif *dpif, struct ofpbuf **packetp)
{
- struct ofpbuf *buf;
- int retval;
- int error;
-
- buf = ofpbuf_new(65536);
- retval = read(dpif->fd, ofpbuf_tail(buf), ofpbuf_tailroom(buf));
- if (retval < 0) {
- error = errno;
- if (error != EAGAIN) {
- VLOG_WARN_RL(&error_rl, "%s: read failed: %s",
- dpif_name(dpif), strerror(error));
- }
- } else if (retval >= sizeof(struct odp_msg)) {
- struct odp_msg *msg = buf->data;
- if (msg->length <= retval) {
- buf->size += retval;
- if (VLOG_IS_DBG_ENABLED()) {
- void *payload = msg + 1;
- size_t length = buf->size - sizeof *msg;
- char *s = ofp_packet_to_string(payload, length, length);
- VLOG_DBG_RL(&dpmsg_rl, "%s: received %s message of length "
- "%zu on port %"PRIu16": %s", dpif_name(dpif),
- (msg->type == _ODPL_MISS_NR ? "miss"
- : msg->type == _ODPL_ACTION_NR ? "action"
- : "<unknown>"),
- msg->length - sizeof(struct odp_msg),
- msg->port, s);
- free(s);
- }
- *bufp = buf;
- COVERAGE_INC(dpif_recv);
- return 0;
- } else {
- VLOG_WARN_RL(&error_rl, "%s: discarding message truncated "
- "from %zu bytes to %d",
- dpif_name(dpif), msg->length, retval);
- error = ERANGE;
+ int error = dpif->class->recv(dpif, packetp);
+ if (!error) {
+ if (VLOG_IS_DBG_ENABLED()) {
+ struct ofpbuf *buf = *packetp;
+ struct odp_msg *msg = buf->data;
+ void *payload = msg + 1;
+ size_t payload_len = buf->size - sizeof *msg;
+ char *s = ofp_packet_to_string(payload, payload_len, payload_len);
+ VLOG_DBG_RL(&dpmsg_rl, "%s: received %s message of length "
+ "%zu on port %"PRIu16": %s", dpif_name(dpif),
+ (msg->type == _ODPL_MISS_NR ? "miss"
+ : msg->type == _ODPL_ACTION_NR ? "action"
+ : "<unknown>"),
+ payload_len, msg->port, s);
+ free(s);
}
- } else if (!retval) {
- VLOG_WARN_RL(&error_rl, "%s: unexpected end of file", dpif_name(dpif));
- error = EPROTO;
} else {
- VLOG_WARN_RL(&error_rl,
- "%s: discarding too-short message (%d bytes)",
- dpif_name(dpif), retval);
- error = ERANGE;
+ *packetp = NULL;
}
-
- *bufp = NULL;
- ofpbuf_delete(buf);
return error;
}
+/* Discards all messages that would otherwise be received by dpif_recv() on
+ * 'dpif'. Returns 0 if successful, otherwise a positive errno value. */
+int
+dpif_recv_purge(struct dpif *dpif)
+{
+ struct odp_stats stats;
+ unsigned int i;
+ int error;
+
+ COVERAGE_INC(dpif_purge);
+
+ error = dpif_get_dp_stats(dpif, &stats);
+ if (error) {
+ return error;
+ }
+
+ for (i = 0; i < stats.max_miss_queue + stats.max_action_queue; i++) {
+ struct ofpbuf *buf;
+ error = dpif_recv(dpif, &buf);
+ if (error) {
+ return error == EAGAIN ? 0 : error;
+ }
+ ofpbuf_delete(buf);
+ }
+ return 0;
+}
+
+/* Arranges for the poll loop to wake up when 'dpif' has a message queued to be
+ * received with dpif_recv(). */
void
dpif_recv_wait(struct dpif *dpif)
{
- poll_fd_wait(dpif->fd, POLLIN);
+ dpif->class->recv_wait(dpif);
}
+/* Obtains the NetFlow engine type and engine ID for 'dpif' into '*engine_type'
+ * and '*engine_id', respectively. */
void
dpif_get_netflow_ids(const struct dpif *dpif,
uint8_t *engine_type, uint8_t *engine_id)
{
- *engine_type = *engine_id = dpif->minor;
+ *engine_type = dpif->netflow_engine_type;
+ *engine_id = dpif->netflow_engine_id;
+}
+\f
+void
+dpif_init(struct dpif *dpif, const struct dpif_class *class, const char *name,
+ uint8_t netflow_engine_type, uint8_t netflow_engine_id)
+{
+ dpif->class = class;
+ dpif->name = xstrdup(name);
+ dpif->netflow_engine_type = netflow_engine_type;
+ dpif->netflow_engine_id = netflow_engine_id;
+}
+\f
+static void
+log_operation(const struct dpif *dpif, const char *operation, int error)
+{
+ if (!error) {
+ VLOG_DBG_RL(&dpmsg_rl, "%s: %s success", dpif_name(dpif), operation);
+ } else {
+ VLOG_WARN_RL(&error_rl, "%s: %s failed (%s)",
+ dpif_name(dpif), operation, strerror(error));
+ }
+}
+
+static enum vlog_level
+flow_message_log_level(int error)
+{
+ return error ? VLL_WARN : VLL_DBG;
+}
+
+static bool
+should_log_flow_message(int error)
+{
+ return !vlog_should_drop(THIS_MODULE, flow_message_log_level(error),
+ error ? &error_rl : &dpmsg_rl);
+}
+
+static void
+log_flow_message(const struct dpif *dpif, int error, const char *operation,
+ const flow_t *flow, const struct odp_flow_stats *stats,
+ const union odp_action *actions, size_t n_actions)
+{
+ struct ds ds = DS_EMPTY_INITIALIZER;
+ ds_put_format(&ds, "%s: ", dpif_name(dpif));
+ if (error) {
+ ds_put_cstr(&ds, "failed to ");
+ }
+ ds_put_format(&ds, "%s ", operation);
+ if (error) {
+ ds_put_format(&ds, "(%s) ", strerror(error));
+ }
+ flow_format(&ds, flow);
+ if (stats) {
+ ds_put_cstr(&ds, ", ");
+ format_odp_flow_stats(&ds, stats);
+ }
+ if (actions || n_actions) {
+ ds_put_cstr(&ds, ", actions:");
+ format_odp_actions(&ds, actions, n_actions);
+ }
+ vlog(THIS_MODULE, flow_message_log_level(error), "%s", ds_cstr(&ds));
+ ds_destroy(&ds);
+}
+
+static void
+log_flow_operation(const struct dpif *dpif, const char *operation, int error,
+ struct odp_flow *flow)
+{
+ if (error) {
+ flow->n_actions = 0;
+ }
+ log_flow_message(dpif, error, operation, &flow->key,
+ !error ? &flow->stats : NULL,
+ flow->actions, flow->n_actions);
+}
+
+static void
+log_flow_put(struct dpif *dpif, int error, const struct odp_flow_put *put)
+{
+ enum { ODPPF_ALL = ODPPF_CREATE | ODPPF_MODIFY | ODPPF_ZERO_STATS };
+ struct ds s;
+
+ ds_init(&s);
+ ds_put_cstr(&s, "put");
+ if (put->flags & ODPPF_CREATE) {
+ ds_put_cstr(&s, "[create]");
+ }
+ if (put->flags & ODPPF_MODIFY) {
+ ds_put_cstr(&s, "[modify]");
+ }
+ if (put->flags & ODPPF_ZERO_STATS) {
+ ds_put_cstr(&s, "[zero]");
+ }
+ if (put->flags & ~ODPPF_ALL) {
+ ds_put_format(&s, "[%x]", put->flags & ~ODPPF_ALL);
+ }
+ log_flow_message(dpif, error, ds_cstr(&s), &put->flow.key,
+ !error ? &put->flow.stats : NULL,
+ put->flow.actions, put->flow.n_actions);
+ ds_destroy(&s);
+}
+
+/* There is a tendency to construct odp_flow objects on the stack and to
+ * forget to properly initialize their "actions" and "n_actions" members.
+ * When this happens, we get memory corruption because the kernel
+ * writes through the random pointer that is in the "actions" member.
+ *
+ * This function attempts to combat the problem by:
+ *
+ * - Forcing a segfault if "actions" points to an invalid region (instead
+ * of just getting back EFAULT, which can be easily missed in the log).
+ *
+ * - Storing a distinctive value that is likely to cause an
+ * easy-to-identify error later if it is dereferenced, etc.
+ *
+ * - Triggering a warning on uninitialized memory from Valgrind if
+ * "actions" or "n_actions" was not initialized.
+ */
+static void
+check_rw_odp_flow(struct odp_flow *flow)
+{
+ if (flow->n_actions) {
+ memset(&flow->actions[0], 0xcc, sizeof flow->actions[0]);
+ }
}
\f
+#include <net/if.h>
+#include <linux/rtnetlink.h>
+#include <linux/ethtool.h>
+#include <linux/sockios.h>
+#include <netinet/in.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#include <unistd.h>
+
struct dpifmon {
struct dpif *dpif;
struct nl_sock *sock;
{
nl_sock_wait(mon->sock, POLLIN);
}
-\f
-static int get_openvswitch_major(void);
-static int get_major(const char *target, int default_major);
-
-static int
-lookup_minor(const char *name, unsigned int *minor)
-{
- struct ethtool_drvinfo drvinfo;
- struct ifreq ifr;
- int error;
- int sock;
-
- *minor = -1;
- sock = socket(AF_INET, SOCK_DGRAM, 0);
- if (sock < 0) {
- VLOG_WARN("socket(AF_INET) failed: %s", strerror(errno));
- error = errno;
- goto error;
- }
-
- memset(&ifr, 0, sizeof ifr);
- strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
- ifr.ifr_data = (caddr_t) &drvinfo;
-
- memset(&drvinfo, 0, sizeof drvinfo);
- drvinfo.cmd = ETHTOOL_GDRVINFO;
- if (ioctl(sock, SIOCETHTOOL, &ifr)) {
- VLOG_WARN("ioctl(SIOCETHTOOL) failed: %s", strerror(errno));
- error = errno;
- goto error_close_sock;
- }
-
- if (strcmp(drvinfo.driver, "openvswitch")) {
- VLOG_WARN("%s is not an openvswitch device", name);
- error = EOPNOTSUPP;
- goto error_close_sock;
- }
-
- if (!isdigit(drvinfo.bus_info[0])) {
- VLOG_WARN("%s ethtool info does not contain an openvswitch minor",
- name);
- error = EPROTOTYPE;
- goto error_close_sock;
- }
-
- *minor = atoi(drvinfo.bus_info);
- close(sock);
- return 0;
-
-error_close_sock:
- close(sock);
-error:
- return error;
-}
-
-static int
-make_openvswitch_device(unsigned int minor, char **fnp)
-{
- dev_t dev = makedev(get_openvswitch_major(), minor);
- const char dirname[] = "/dev/net";
- struct stat s;
- char fn[128];
-
- *fnp = NULL;
- sprintf(fn, "%s/dp%d", dirname, minor);
- if (!stat(fn, &s)) {
- if (!S_ISCHR(s.st_mode)) {
- VLOG_WARN_RL(&error_rl, "%s is not a character device, fixing",
- fn);
- } else if (s.st_rdev != dev) {
- VLOG_WARN_RL(&error_rl,
- "%s is device %u:%u instead of %u:%u, fixing",
- fn, major(s.st_rdev), minor(s.st_rdev),
- major(dev), minor(dev));
- } else {
- goto success;
- }
- if (unlink(fn)) {
- VLOG_WARN_RL(&error_rl, "%s: unlink failed (%s)",
- fn, strerror(errno));
- return errno;
- }
- } else if (errno == ENOENT) {
- if (stat(dirname, &s)) {
- if (errno == ENOENT) {
- if (mkdir(dirname, 0755)) {
- VLOG_WARN_RL(&error_rl, "%s: mkdir failed (%s)",
- dirname, strerror(errno));
- return errno;
- }
- } else {
- VLOG_WARN_RL(&error_rl, "%s: stat failed (%s)",
- dirname, strerror(errno));
- return errno;
- }
- }
- } else {
- VLOG_WARN_RL(&error_rl, "%s: stat failed (%s)", fn, strerror(errno));
- return errno;
- }
-
- /* The device needs to be created. */
- if (mknod(fn, S_IFCHR | 0700, dev)) {
- VLOG_WARN_RL(&error_rl,
- "%s: creating character device %u:%u failed (%s)",
- fn, major(dev), minor(dev), strerror(errno));
- return errno;
- }
-
-success:
- *fnp = xstrdup(fn);
- return 0;
-}
-
-
-static int
-get_openvswitch_major(void)
-{
- static unsigned int openvswitch_major;
- if (!openvswitch_major) {
- enum { DEFAULT_MAJOR = 248 };
- openvswitch_major = get_major("openvswitch", DEFAULT_MAJOR);
- }
- return openvswitch_major;
-}
-
-static int
-get_major(const char *target, int default_major)
-{
- const char fn[] = "/proc/devices";
- char line[128];
- FILE *file;
- int ln;
-
- file = fopen(fn, "r");
- if (!file) {
- VLOG_ERR("opening %s failed (%s)", fn, strerror(errno));
- goto error;
- }
-
- for (ln = 1; fgets(line, sizeof line, file); ln++) {
- char name[64];
- int major;
-
- if (!strncmp(line, "Character", 9) || line[0] == '\0') {
- /* Nothing to do. */
- } else if (!strncmp(line, "Block", 5)) {
- /* We only want character devices, so skip the rest of the file. */
- break;
- } else if (sscanf(line, "%d %63s", &major, name)) {
- if (!strcmp(name, target)) {
- fclose(file);
- return major;
- }
- } else {
- static bool warned;
- if (!warned) {
- VLOG_WARN("%s:%d: syntax error", fn, ln);
- }
- warned = true;
- }
- }
-
- VLOG_ERR("%s: %s major not found (is the module loaded?), using "
- "default major %d", fn, target, default_major);
-error:
- VLOG_INFO("using default major %d for %s", default_major, target);
- return default_major;
-}
-
-static int
-name_to_minor(const char *name, unsigned int *minor)
-{
- if (!get_minor_from_name(name, minor)) {
- return 0;
- }
- return lookup_minor(name, minor);
-}
-
-static int
-get_minor_from_name(const char *name, unsigned int *minor)
-{
- if (!strncmp(name, "dp", 2) && isdigit(name[2])) {
- *minor = atoi(name + 2);
- return 0;
- } else {
- return EINVAL;
- }
-}
-
-static int
-open_by_minor(unsigned int minor, struct dpif **dpifp)
-{
- struct dpif *dpif;
- int error;
- char *fn;
- int fd;
-
- *dpifp = NULL;
- error = make_openvswitch_device(minor, &fn);
- if (error) {
- return error;
- }
-
- fd = open(fn, O_RDONLY | O_NONBLOCK);
- if (fd < 0) {
- error = errno;
- VLOG_WARN("%s: open failed (%s)", fn, strerror(error));
- free(fn);
- return error;
- }
- free(fn);
-
- dpif = xmalloc(sizeof *dpif);
- dpif->name = xasprintf("dp%u", dpif->minor);
- dpif->minor = minor;
- dpif->fd = fd;
- *dpifp = dpif;
- return 0;
-}
-\f
-/* There is a tendency to construct odp_flow objects on the stack and to
- * forget to properly initialize their "actions" and "n_actions" members.
- * When this happens, we get memory corruption because the kernel
- * writes through the random pointer that is in the "actions" member.
- *
- * This function attempts to combat the problem by:
- *
- * - Forcing a segfault if "actions" points to an invalid region (instead
- * of just getting back EFAULT, which can be easily missed in the log).
- *
- * - Storing a distinctive value that is likely to cause an
- * easy-to-identify error later if it is dereferenced, etc.
- *
- * - Triggering a warning on uninitialized memory from Valgrind if
- * "actions" or "n_actions" was not initialized.
- */
-static void
-check_rw_odp_flow(struct odp_flow *flow)
-{
- if (flow->n_actions) {
- memset(&flow->actions[0], 0xcc, sizeof flow->actions[0]);
- }
-}
projects / openvswitch / commitdiff