--- /dev/null
- "from %zu bytes to %d",
+/*
+ * 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/rtnetlink.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 "rtnetlink.h"
+#include "svec.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;
+
+ /* Used by dpif_linux_get_all_names(). */
+ char *local_ifname;
+ int minor;
+
+ /* Change notification. */
+ int local_ifindex; /* Ifindex of local port. */
+ struct svec changed_ports; /* Ports that have changed. */
+ struct rtnetlink_notifier port_notifier;
+ bool change_error;
+};
+
+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 finish_open(struct dpif *, const char *local_ifname);
+static int get_openvswitch_major(void);
+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 void dpif_linux_port_changed(const struct rtnetlink_change *,
+ void *dpif);
+
+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_enumerate(struct svec *all_dps)
+{
+ int major;
+ int error;
+ int i;
+
+ /* Check that the Open vSwitch module is loaded. */
+ major = get_openvswitch_major();
+ if (major < 0) {
+ return -major;
+ }
+
+ error = 0;
+ for (i = 0; i < ODP_MAX; i++) {
+ struct dpif *dpif;
+ char devname[16];
+ int retval;
+
+ sprintf(devname, "dp%d", i);
+ retval = dpif_open(devname, &dpif);
+ if (!retval) {
+ svec_add(all_dps, devname);
+ dpif_close(dpif);
+ } else if (retval != ENODEV && !error) {
+ error = retval;
+ }
+ }
+ return error;
+}
+
+static int
+dpif_linux_open(const char *name UNUSED, char *suffix, bool create,
+ struct dpif **dpifp)
+{
+ int minor;
+
+ minor = !strncmp(name, "dp", 2)
+ && isdigit((unsigned char)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;
+ struct odp_port port;
+ 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 need the local port's ifindex for the poll function. Start by
+ * getting the local port's name. */
+ memset(&port, 0, sizeof port);
+ port.port = ODPP_LOCAL;
+ if (ioctl(dpif->fd, ODP_PORT_QUERY, &port)) {
+ error = errno;
+ if (error != ENODEV) {
+ VLOG_WARN("%s: probe returned unexpected error: %s",
+ dpif_name(*dpifp), strerror(error));
+ }
+ dpif_close(*dpifp);
+ return error;
+ }
+
+ /* Then use that to finish up opening. */
+ return finish_open(&dpif->dpif, port.devname);
+ }
+}
+
+static void
+dpif_linux_close(struct dpif *dpif_)
+{
+ struct dpif_linux *dpif = dpif_linux_cast(dpif_);
+ rtnetlink_notifier_unregister(&dpif->port_notifier);
+ svec_destroy(&dpif->changed_ports);
+ free(dpif->local_ifname);
+ close(dpif->fd);
+ free(dpif);
+}
+
+static int
+dpif_linux_get_all_names(const struct dpif *dpif_, struct svec *all_names)
+{
+ struct dpif_linux *dpif = dpif_linux_cast(dpif_);
+
+ svec_add_nocopy(all_names, xasprintf("dp%d", dpif->minor));
+ svec_add(all_names, dpif->local_ifname);
+ return 0;
+}
+
+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_poll(const struct dpif *dpif_, char **devnamep)
+{
+ struct dpif_linux *dpif = dpif_linux_cast(dpif_);
+
+ if (dpif->change_error) {
+ dpif->change_error = false;
+ svec_clear(&dpif->changed_ports);
+ return ENOBUFS;
+ } else if (dpif->changed_ports.n) {
+ *devnamep = dpif->changed_ports.names[--dpif->changed_ports.n];
+ return 0;
+ } else {
+ return EAGAIN;
+ }
+}
+
+static void
+dpif_linux_port_poll_wait(const struct dpif *dpif_)
+{
+ struct dpif_linux *dpif = dpif_linux_cast(dpif_);
+ if (dpif->changed_ports.n || dpif->change_error) {
+ poll_immediate_wake();
+ } else {
+ rtnetlink_notifier_wait();
+ }
+}
+
+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 %"PRIu32" 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",
+ NULL,
+ NULL,
+ dpif_linux_enumerate,
+ dpif_linux_open,
+ dpif_linux_close,
+ dpif_linux_get_all_names,
+ 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_poll,
+ dpif_linux_port_poll_wait,
+ 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);
+
+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 *minorp)
+{
+ struct ethtool_drvinfo drvinfo;
+ int minor, port_no;
+ 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 (sscanf(drvinfo.bus_info, "%d.%d", &minor, &port_no) != 2) {
+ VLOG_WARN("%s ethtool bus_info has unexpected format", name);
+ error = EPROTOTYPE;
+ goto error_close_sock;
+ } else if (port_no != ODPP_LOCAL) {
+ /* This is an Open vSwitch device but not the local port. We
+ * intentionally support only using the name of the local port as the
+ * name of a datapath; otherwise, it would be too difficult to
+ * enumerate all the names of a datapath. */
+ error = EOPNOTSUPP;
+ goto error_close_sock;
+ }
+
+ *minorp = minor;
+ close(sock);
+ return 0;
+
+error_close_sock:
+ close(sock);
+error:
+ return error;
+}
+
+static int
+make_openvswitch_device(int minor, char **fnp)
+{
+ const char dirname[] = "/dev/net";
+ int major;
+ dev_t dev;
+ struct stat s;
+ char fn[128];
+
+ major = get_openvswitch_major();
+ if (major < 0) {
+ return -major;
+ }
+ dev = makedev(major, minor);
+
+ *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 but should be %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;
+}
+
+/* Return the major device number of the Open vSwitch device. If it
+ * cannot be determined, a negative errno is returned. */
+static int
+get_openvswitch_major(void)
+{
+ static int openvswitch_major = -1;
+ if (openvswitch_major < 0) {
+ openvswitch_major = get_major("openvswitch");
+ }
+ return openvswitch_major;
+}
+
+static int
+get_major(const char *target)
+{
+ 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));
+ return -errno;
+ }
+
+ 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?)", fn, target);
+ return -ENODEV;
+}
+
+static int
+finish_open(struct dpif *dpif_, const char *local_ifname)
+{
+ struct dpif_linux *dpif = dpif_linux_cast(dpif_);
+ dpif->local_ifname = strdup(local_ifname);
+ dpif->local_ifindex = if_nametoindex(local_ifname);
+ if (!dpif->local_ifindex) {
+ int error = errno;
+ dpif_close(dpif_);
+ VLOG_WARN("could not get ifindex of %s device: %s",
+ local_ifname, strerror(errno));
+ return error;
+ }
+ return 0;
+}
+
+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) {
+ error = finish_open(*dpifp, name);
+ } else {
+ 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 = xmalloc(sizeof *dpif);
+ error = rtnetlink_notifier_register(&dpif->port_notifier,
+ dpif_linux_port_changed, dpif);
+ if (!error) {
+ char *name;
+
+ name = xasprintf("dp%d", minor);
+ dpif_init(&dpif->dpif, &dpif_linux_class, name, minor, minor);
+ free(name);
+
+ dpif->fd = fd;
+ dpif->local_ifname = NULL;
+ dpif->minor = minor;
+ dpif->local_ifindex = 0;
+ svec_init(&dpif->changed_ports);
+ dpif->change_error = false;
+ *dpifp = &dpif->dpif;
+ } else {
+ free(dpif);
+ }
+ } else {
+ error = errno;
+ VLOG_WARN("%s: open failed (%s)", fn, strerror(error));
+ }
+ free(fn);
+
+ return error;
+}
+
+static void
+dpif_linux_port_changed(const struct rtnetlink_change *change, void *dpif_)
+{
+ struct dpif_linux *dpif = dpif_;
+
+ if (change) {
+ if (change->master_ifindex == dpif->local_ifindex
+ && (change->nlmsg_type == RTM_NEWLINK
+ || change->nlmsg_type == RTM_DELLINK))
+ {
+ /* Our datapath changed, either adding a new port or deleting an
+ * existing one. */
+ if (!svec_contains(&dpif->changed_ports, change->ifname)) {
+ svec_add(&dpif->changed_ports, change->ifname);
+ svec_sort(&dpif->changed_ports);
+ }
+ }
+ } else {
+ dpif->change_error = true;
+ }
+}
git://git.onelab.eu / sliver-openvswitch.git / commitdiff