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f7cd0081f525dd1d45fafc68397b5393196e978d
ovs/lib/dpif-linux.c
Ben Pfaff f7cd0081f5 datapath: Convert ODP_EXECUTE to use Netlink framing. 
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
2011-01-27 21:08:40 -08:00

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/*
* Copyright (c) 2008, 2009, 2010, 2011 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-linux.h"
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <net/if.h>
#include <linux/types.h>
#include <linux/ethtool.h>
#include <linux/pkt_sched.h>
#include <linux/rtnetlink.h>
#include <linux/sockios.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <unistd.h>
#include "dpif-provider.h"
#include "netdev.h"
#include "netdev-vport.h"
#include "netlink.h"
#include "odp-util.h"
#include "ofpbuf.h"
#include "openvswitch/tunnel.h"
#include "packets.h"
#include "poll-loop.h"
#include "rtnetlink.h"
#include "rtnetlink-link.h"
#include "shash.h"
#include "svec.h"
#include "unaligned.h"
#include "util.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(dpif_linux);
struct dpif_linux_dp {
/* ioctl command argument. */
int cmd;
/* struct odp_datapath header. */
uint32_t dp_idx;
/* Attributes. */
const char *name; /* ODP_DP_ATTR_NAME. */
struct odp_stats stats; /* ODP_DP_ATTR_STATS. */
enum odp_frag_handling ipv4_frags; /* ODP_DP_ATTR_IPV4_FRAGS. */
const uint32_t *sampling; /* ODP_DP_ATTR_SAMPLING. */
};
static void dpif_linux_dp_init(struct dpif_linux_dp *);
static int dpif_linux_dp_transact(const struct dpif_linux_dp *request,
struct dpif_linux_dp *reply,
struct ofpbuf **bufp);
static int dpif_linux_dp_get(const struct dpif *, struct dpif_linux_dp *reply,
struct ofpbuf **bufp);
struct dpif_linux_flow {
/* ioctl command argument. */
int cmd;
/* struct odp_flow header. */
unsigned int nlmsg_flags;
uint32_t dp_idx;
/* Attributes.
*
* The 'stats', 'used', and 'state' members point to 64-bit data that might
* only be aligned on 32-bit boundaries, so get_unaligned_u64() should be
* used to access their values. */
const struct nlattr *key; /* ODP_FLOW_ATTR_KEY. */
size_t key_len;
const struct nlattr *actions; /* ODP_FLOW_ATTR_ACTIONS. */
size_t actions_len;
const struct odp_flow_stats *stats; /* ODP_FLOW_ATTR_STATS. */
const uint8_t *tcp_flags; /* ODP_FLOW_ATTR_TCP_FLAGS. */
const uint64_t *used; /* ODP_FLOW_ATTR_USED. */
bool clear; /* ODP_FLOW_ATTR_CLEAR. */
const uint64_t *state; /* ODP_FLOW_ATTR_STATE. */
};
static void dpif_linux_flow_init(struct dpif_linux_flow *);
static int dpif_linux_flow_transact(const struct dpif_linux_flow *request,
struct dpif_linux_flow *reply,
struct ofpbuf **bufp);
static void dpif_linux_flow_get_stats(const struct dpif_linux_flow *,
struct dpif_flow_stats *);
/* 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 shash 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 open_dpif(const struct dpif_linux_vport *local_vport,
struct dpif **);
static int get_openvswitch_major(void);
static int open_minor(int minor, int *fdp);
static int make_openvswitch_device(int minor, char **fnp);
static void dpif_linux_port_changed(const struct rtnetlink_link_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)
{
uint32_t dp_idx;
int major;
/* Check that the Open vSwitch module is loaded. */
major = get_openvswitch_major();
if (major < 0) {
return -major;
}
dp_idx = 0;
for (;;) {
struct dpif_linux_dp request, reply;
struct ofpbuf *buf;
char devname[16];
int error;
dpif_linux_dp_init(&request);
request.dp_idx = dp_idx;
request.cmd = ODP_DP_DUMP;
error = dpif_linux_dp_transact(&request, &reply, &buf);
if (error) {
return error == ENODEV ? 0 : error;
}
ofpbuf_delete(buf);
sprintf(devname, "dp%d", reply.dp_idx);
svec_add(all_dps, devname);
dp_idx = reply.dp_idx + 1;
}
}
static int
dpif_linux_open(const struct dpif_class *class OVS_UNUSED, const char *name,
bool create, struct dpif **dpifp)
{
struct dpif_linux_vport request, reply;
struct ofpbuf *buf;
int minor;
int error;
minor = !strncmp(name, "dp", 2)
&& isdigit((unsigned char)name[2]) ? atoi(name + 2) : -1;
if (create) {
struct dpif_linux_dp request, reply;
struct ofpbuf *buf;
int error;
dpif_linux_dp_init(&request);
request.cmd = ODP_DP_NEW;
request.dp_idx = minor;
request.name = name;
error = dpif_linux_dp_transact(&request, &reply, &buf);
if (error) {
return error;
}
minor = reply.dp_idx;
ofpbuf_delete(buf);
}
dpif_linux_vport_init(&request);
request.cmd = ODP_VPORT_GET;
request.port_no = ODPP_LOCAL;
if (minor >= 0) {
request.dp_idx = minor;
} else {
request.name = name;
}
error = dpif_linux_vport_transact(&request, &reply, &buf);
if (error) {
return error;
} else if (reply.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;
} else {
error = open_dpif(&reply, dpifp);
}
ofpbuf_delete(buf);
return error;
}
static int
open_dpif(const struct dpif_linux_vport *local_vport, struct dpif **dpifp)
{
int dp_idx = local_vport->dp_idx;
struct dpif_linux *dpif;
char *name;
int error;
int fd;
error = open_minor(dp_idx, &fd);
if (error) {
goto error;
}
dpif = xmalloc(sizeof *dpif);
error = rtnetlink_link_notifier_register(&dpif->port_notifier,
dpif_linux_port_changed, dpif);
if (error) {
goto error_free;
}
name = xasprintf("dp%d", dp_idx);
dpif_init(&dpif->dpif, &dpif_linux_class, name, dp_idx, dp_idx);
free(name);
dpif->fd = fd;
dpif->local_ifname = xstrdup(local_vport->name);
dpif->local_ifindex = local_vport->ifindex;
dpif->minor = dp_idx;
shash_init(&dpif->changed_ports);
dpif->change_error = false;
*dpifp = &dpif->dpif;
return 0;
error_free:
free(dpif);
close(fd);
error:
return error;
}
static void
dpif_linux_close(struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
rtnetlink_link_notifier_unregister(&dpif->port_notifier);
shash_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_destroy(struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_dp dp;
dpif_linux_dp_init(&dp);
dp.cmd = ODP_DP_DEL;
dp.dp_idx = dpif->minor;
return dpif_linux_dp_transact(&dp, NULL, NULL);
}
static int
dpif_linux_get_stats(const struct dpif *dpif_, struct odp_stats *stats)
{
struct dpif_linux_dp dp;
struct ofpbuf *buf;
int error;
error = dpif_linux_dp_get(dpif_, &dp, &buf);
if (!error) {
*stats = dp.stats;
ofpbuf_delete(buf);
}
return error;
}
static int
dpif_linux_get_drop_frags(const struct dpif *dpif_, bool *drop_fragsp)
{
struct dpif_linux_dp dp;
struct ofpbuf *buf;
int error;
error = dpif_linux_dp_get(dpif_, &dp, &buf);
if (!error) {
*drop_fragsp = dp.ipv4_frags == ODP_DP_FRAG_DROP;
ofpbuf_delete(buf);
}
return error;
}
static int
dpif_linux_set_drop_frags(struct dpif *dpif_, bool drop_frags)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_dp dp;
dpif_linux_dp_init(&dp);
dp.cmd = ODP_DP_SET;
dp.dp_idx = dpif->minor;
dp.ipv4_frags = drop_frags ? ODP_DP_FRAG_DROP : ODP_DP_FRAG_ZERO;
return dpif_linux_dp_transact(&dp, NULL, NULL);
}
static int
dpif_linux_port_add(struct dpif *dpif_, struct netdev *netdev,
uint16_t *port_nop)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
const char *name = netdev_get_name(netdev);
const char *type = netdev_get_type(netdev);
struct dpif_linux_vport request, reply;
const struct ofpbuf *options;
struct ofpbuf *buf;
int error;
dpif_linux_vport_init(&request);
request.cmd = ODP_VPORT_NEW;
request.dp_idx = dpif->minor;
request.type = netdev_vport_get_vport_type(netdev);
if (request.type == ODP_VPORT_TYPE_UNSPEC) {
VLOG_WARN_RL(&error_rl, "%s: cannot create port `%s' because it has "
"unsupported type `%s'",
dpif_name(dpif_), name, type);
return EINVAL;
}
request.name = name;
options = netdev_vport_get_options(netdev);
if (options && options->size) {
request.options = options->data;
request.options_len = options->size;
}
error = dpif_linux_vport_transact(&request, &reply, &buf);
if (!error) {
*port_nop = reply.port_no;
ofpbuf_delete(buf);
}
return error;
}
static int
dpif_linux_port_del(struct dpif *dpif_, uint16_t port_no)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_vport vport;
dpif_linux_vport_init(&vport);
vport.cmd = ODP_VPORT_DEL;
vport.dp_idx = dpif->minor;
vport.port_no = port_no;
return dpif_linux_vport_transact(&vport, NULL, NULL);
}
static int
dpif_linux_port_query__(const struct dpif *dpif, uint32_t port_no,
const char *port_name, struct dpif_port *dpif_port)
{
struct dpif_linux_vport request;
struct dpif_linux_vport reply;
struct ofpbuf *buf;
int error;
dpif_linux_vport_init(&request);
request.cmd = ODP_VPORT_GET;
request.dp_idx = dpif_linux_cast(dpif)->minor;
request.port_no = port_no;
request.name = port_name;
error = dpif_linux_vport_transact(&request, &reply, &buf);
if (!error) {
dpif_port->name = xstrdup(reply.name);
dpif_port->type = xstrdup(netdev_vport_get_netdev_type(&reply));
dpif_port->port_no = reply.port_no;
ofpbuf_delete(buf);
}
return error;
}
static int
dpif_linux_port_query_by_number(const struct dpif *dpif, uint16_t port_no,
struct dpif_port *dpif_port)
{
return dpif_linux_port_query__(dpif, port_no, NULL, dpif_port);
}
static int
dpif_linux_port_query_by_name(const struct dpif *dpif, const char *devname,
struct dpif_port *dpif_port)
{
return dpif_linux_port_query__(dpif, 0, devname, dpif_port);
}
static int
dpif_linux_get_max_ports(const struct dpif *dpif OVS_UNUSED)
{
/* If the datapath increases its range of supported ports, then it should
* start reporting that. */
return 1024;
}
static int
dpif_linux_flow_flush(struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
return ioctl(dpif->fd, ODP_FLOW_FLUSH, dpif->minor) ? errno : 0;
}
struct dpif_linux_port_state {
struct ofpbuf *buf;
uint32_t next;
};
static int
dpif_linux_port_dump_start(const struct dpif *dpif OVS_UNUSED, void **statep)
{
*statep = xzalloc(sizeof(struct dpif_linux_port_state));
return 0;
}
static int
dpif_linux_port_dump_next(const struct dpif *dpif, void *state_,
struct dpif_port *dpif_port)
{
struct dpif_linux_port_state *state = state_;
struct dpif_linux_vport request, reply;
struct ofpbuf *buf;
int error;
ofpbuf_delete(state->buf);
state->buf = NULL;
dpif_linux_vport_init(&request);
request.cmd = ODP_VPORT_DUMP;
request.dp_idx = dpif_linux_cast(dpif)->minor;
request.port_no = state->next;
error = dpif_linux_vport_transact(&request, &reply, &buf);
if (error) {
return error == ENODEV ? EOF : error;
} else {
dpif_port->name = (char *) reply.name;
dpif_port->type = (char *) netdev_vport_get_netdev_type(&reply);
dpif_port->port_no = reply.port_no;
state->buf = buf;
state->next = reply.port_no + 1;
return 0;
}
}
static int
dpif_linux_port_dump_done(const struct dpif *dpif OVS_UNUSED, void *state_)
{
struct dpif_linux_port_state *state = state_;
ofpbuf_delete(state->buf);
free(state);
return 0;
}
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;
shash_clear(&dpif->changed_ports);
return ENOBUFS;
} else if (!shash_is_empty(&dpif->changed_ports)) {
struct shash_node *node = shash_first(&dpif->changed_ports);
*devnamep = shash_steal(&dpif->changed_ports, node);
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 (!shash_is_empty(&dpif->changed_ports) || dpif->change_error) {
poll_immediate_wake();
} else {
rtnetlink_link_notifier_wait();
}
}
static int
dpif_linux_flow_get(const struct dpif *dpif_,
const struct nlattr *key, size_t key_len,
struct ofpbuf **actionsp, struct dpif_flow_stats *stats)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_flow request, reply;
struct ofpbuf *buf;
int error;
dpif_linux_flow_init(&request);
request.cmd = ODP_FLOW_GET;
request.dp_idx = dpif->minor;
request.key = key;
request.key_len = key_len;
error = dpif_linux_flow_transact(&request, &reply, &buf);
if (!error) {
if (stats) {
dpif_linux_flow_get_stats(&reply, stats);
}
if (actionsp) {
buf->data = (void *) reply.actions;
buf->size = reply.actions_len;
*actionsp = buf;
} else {
ofpbuf_delete(buf);
}
}
return error;
}
static int
dpif_linux_flow_put(struct dpif *dpif_, enum dpif_flow_put_flags flags,
const struct nlattr *key, size_t key_len,
const struct nlattr *actions, size_t actions_len,
struct dpif_flow_stats *stats)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_flow request, reply;
struct ofpbuf *buf;
int error;
dpif_linux_flow_init(&request);
request.cmd = flags & DPIF_FP_CREATE ? ODP_FLOW_NEW : ODP_FLOW_SET;
request.dp_idx = dpif->minor;
request.key = key;
request.key_len = key_len;
request.actions = actions;
request.actions_len = actions_len;
if (flags & DPIF_FP_ZERO_STATS) {
request.clear = true;
}
request.nlmsg_flags = flags & DPIF_FP_MODIFY ? 0 : NLM_F_CREATE;
error = dpif_linux_flow_transact(&request,
stats ? &reply : NULL,
stats ? &buf : NULL);
if (!error && stats) {
dpif_linux_flow_get_stats(&reply, stats);
ofpbuf_delete(buf);
}
return error;
}
static int
dpif_linux_flow_del(struct dpif *dpif_,
const struct nlattr *key, size_t key_len,
struct dpif_flow_stats *stats)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_flow request, reply;
struct ofpbuf *buf;
int error;
dpif_linux_flow_init(&request);
request.cmd = ODP_FLOW_DEL;
request.dp_idx = dpif->minor;
request.key = key;
request.key_len = key_len;
error = dpif_linux_flow_transact(&request,
stats ? &reply : NULL,
stats ? &buf : NULL);
if (!error && stats) {
dpif_linux_flow_get_stats(&reply, stats);
ofpbuf_delete(buf);
}
return error;
}
struct dpif_linux_flow_state {
struct dpif_linux_flow flow;
struct ofpbuf *buf;
struct dpif_flow_stats stats;
};
static int
dpif_linux_flow_dump_start(const struct dpif *dpif OVS_UNUSED, void **statep)
{
*statep = xzalloc(sizeof(struct dpif_linux_flow_state));
return 0;
}
static int
dpif_linux_flow_dump_next(const struct dpif *dpif_, void *state_,
const struct nlattr **key, size_t *key_len,
const struct nlattr **actions, size_t *actions_len,
const struct dpif_flow_stats **stats)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_flow_state *state = state_;
struct ofpbuf *old_buf = state->buf;
struct dpif_linux_flow request;
int error;
dpif_linux_flow_init(&request);
request.cmd = ODP_FLOW_DUMP;
request.dp_idx = dpif->minor;
request.state = state->flow.state;
error = dpif_linux_flow_transact(&request, &state->flow, &state->buf);
ofpbuf_delete(old_buf);
if (!error) {
if (key) {
*key = state->flow.key;
*key_len = state->flow.key_len;
}
if (actions) {
*actions = state->flow.actions;
*actions_len = state->flow.actions_len;
}
if (stats) {
dpif_linux_flow_get_stats(&state->flow, &state->stats);
*stats = &state->stats;
}
}
return error == ENODEV ? EOF : error;
}
static int
dpif_linux_flow_dump_done(const struct dpif *dpif OVS_UNUSED, void *state_)
{
struct dpif_linux_flow_state *state = state_;
ofpbuf_delete(state->buf);
free(state);
return 0;
}
static int
dpif_linux_execute(struct dpif *dpif_,
const struct nlattr *actions, size_t actions_len,
const struct ofpbuf *packet)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct odp_upcall *execute;
struct ofpbuf *buf;
int error;
buf = ofpbuf_new(128 + actions_len + packet->size);
ofpbuf_reserve(buf, sizeof *execute);
nl_msg_put_unspec(buf, ODP_PACKET_ATTR_PACKET, packet->data, packet->size);
nl_msg_put_unspec(buf, ODP_PACKET_ATTR_ACTIONS, actions, actions_len);
execute = ofpbuf_push_uninit(buf, sizeof *execute);
execute->dp_idx = dpif->minor;
execute->len = buf->size;
error = do_ioctl(dpif_, ODP_EXECUTE, buf->data);
ofpbuf_delete(buf);
return error;
}
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_get_sflow_probability(const struct dpif *dpif_,
uint32_t *probability)
{
struct dpif_linux_dp dp;
struct ofpbuf *buf;
int error;
error = dpif_linux_dp_get(dpif_, &dp, &buf);
if (!error) {
*probability = dp.sampling ? *dp.sampling : 0;
ofpbuf_delete(buf);
}
return error;
}
static int
dpif_linux_set_sflow_probability(struct dpif *dpif_, uint32_t probability)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_dp dp;
dpif_linux_dp_init(&dp);
dp.cmd = ODP_DP_SET;
dp.dp_idx = dpif->minor;
dp.sampling = &probability;
return dpif_linux_dp_transact(&dp, NULL, NULL);
}
static int
dpif_linux_queue_to_priority(const struct dpif *dpif OVS_UNUSED,
uint32_t queue_id, uint32_t *priority)
{
if (queue_id < 0xf000) {
*priority = TC_H_MAKE(1 << 16, queue_id + 1);
return 0;
} else {
return EINVAL;
}
}
static int
parse_odp_packet(struct ofpbuf *buf, struct dpif_upcall *upcall)
{
static const struct nl_policy odp_packet_policy[] = {
/* Always present. */
[ODP_PACKET_ATTR_TYPE] = { .type = NL_A_U32 },
[ODP_PACKET_ATTR_PACKET] = { .type = NL_A_UNSPEC,
.min_len = ETH_HEADER_LEN },
[ODP_PACKET_ATTR_KEY] = { .type = NL_A_NESTED },
/* _ODPL_ACTION_NR only. */
[ODP_PACKET_ATTR_USERDATA] = { .type = NL_A_U64, .optional = true },
/* _ODPL_SFLOW_NR only. */
[ODP_PACKET_ATTR_SAMPLE_POOL] = { .type = NL_A_U32, .optional = true },
[ODP_PACKET_ATTR_ACTIONS] = { .type = NL_A_NESTED, .optional = true },
};
struct odp_packet *odp_packet = buf->data;
struct nlattr *a[ARRAY_SIZE(odp_packet_policy)];
if (!nl_policy_parse(buf, sizeof *odp_packet, odp_packet_policy,
a, ARRAY_SIZE(odp_packet_policy))) {
return EINVAL;
}
memset(upcall, 0, sizeof *upcall);
upcall->type = nl_attr_get_u32(a[ODP_PACKET_ATTR_TYPE]);
upcall->packet = buf;
upcall->packet->data = (void *) nl_attr_get(a[ODP_PACKET_ATTR_PACKET]);
upcall->packet->size = nl_attr_get_size(a[ODP_PACKET_ATTR_PACKET]);
upcall->key = (void *) nl_attr_get(a[ODP_PACKET_ATTR_KEY]);
upcall->key_len = nl_attr_get_size(a[ODP_PACKET_ATTR_KEY]);
upcall->userdata = (a[ODP_PACKET_ATTR_USERDATA]
? nl_attr_get_u64(a[ODP_PACKET_ATTR_USERDATA])
: 0);
upcall->sample_pool = (a[ODP_PACKET_ATTR_SAMPLE_POOL]
? nl_attr_get_u32(a[ODP_PACKET_ATTR_SAMPLE_POOL])
: 0);
if (a[ODP_PACKET_ATTR_ACTIONS]) {
upcall->actions = (void *) nl_attr_get(a[ODP_PACKET_ATTR_ACTIONS]);
upcall->actions_len = nl_attr_get_size(a[ODP_PACKET_ATTR_ACTIONS]);
}
return 0;
}
static int
dpif_linux_recv(struct dpif *dpif_, struct dpif_upcall *upcall)
{
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_packet)) {
struct odp_packet *odp_packet = buf->data;
buf->size += retval;
if (odp_packet->len <= retval) {
error = parse_odp_packet(buf, upcall);
} else {
VLOG_WARN_RL(&error_rl, "%s: discarding message truncated "
"from %"PRIu32" bytes to %d",
dpif_name(dpif_), odp_packet->len, 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;
}
if (error) {
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);
}
static void
dpif_linux_recv_purge(struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
int i;
/* This is somewhat bogus because it assumes that the following macros have
* fixed values, but it's going to go away later. */
#define DP_N_QUEUES 3
#define DP_MAX_QUEUE_LEN 100
for (i = 0; i < DP_N_QUEUES * DP_MAX_QUEUE_LEN; i++) {
/* Reading even 1 byte discards a whole datagram and saves time. */
char buffer;
if (read(dpif->fd, &buffer, 1) != 1) {
break;
}
}
}
const struct dpif_class dpif_linux_class = {
"system",
NULL,
NULL,
dpif_linux_enumerate,
dpif_linux_open,
dpif_linux_close,
dpif_linux_get_all_names,
dpif_linux_destroy,
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_get_max_ports,
dpif_linux_port_dump_start,
dpif_linux_port_dump_next,
dpif_linux_port_dump_done,
dpif_linux_port_poll,
dpif_linux_port_poll_wait,
dpif_linux_flow_get,
dpif_linux_flow_put,
dpif_linux_flow_del,
dpif_linux_flow_flush,
dpif_linux_flow_dump_start,
dpif_linux_flow_dump_next,
dpif_linux_flow_dump_done,
dpif_linux_execute,
dpif_linux_recv_get_mask,
dpif_linux_recv_set_mask,
dpif_linux_get_sflow_probability,
dpif_linux_set_sflow_probability,
dpif_linux_queue_to_priority,
dpif_linux_recv,
dpif_linux_recv_wait,
dpif_linux_recv_purge,
};
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;
}
bool
dpif_linux_is_internal_device(const char *name)
{
struct dpif_linux_vport reply;
struct ofpbuf *buf;
int error;
error = dpif_linux_vport_get(name, &reply, &buf);
if (!error) {
ofpbuf_delete(buf);
} else if (error != ENODEV) {
VLOG_WARN_RL(&error_rl, "%s: vport query failed (%s)",
name, strerror(error));
}
return reply.type == ODP_VPORT_TYPE_INTERNAL;
}
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];
*fnp = NULL;
major = get_openvswitch_major();
if (major < 0) {
return -major;
}
dev = makedev(major, minor);
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 {
VLOG_WARN_ONCE("%s:%d: syntax error", fn, ln);
}
}
fclose(file);
VLOG_ERR("%s: %s major not found (is the module loaded?)", fn, target);
return -ENODEV;
}
static int
open_minor(int minor, int *fdp)
{
int error;
char *fn;
error = make_openvswitch_device(minor, &fn);
if (error) {
return error;
}
*fdp = open(fn, O_RDONLY | O_NONBLOCK);
if (*fdp < 0) {
error = errno;
VLOG_WARN("%s: open failed (%s)", fn, strerror(error));
free(fn);
return error;
}
free(fn);
return 0;
}
static void
dpif_linux_port_changed(const struct rtnetlink_link_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. */
shash_add_once(&dpif->changed_ports, change->ifname, NULL);
}
} else {
dpif->change_error = true;
}
}
static int
get_dp0_fd(int *dp0_fdp)
{
static int dp0_fd = -1;
if (dp0_fd < 0) {
int error;
int fd;
error = open_minor(0, &fd);
if (error) {
return error;
}
dp0_fd = fd;
}
*dp0_fdp = dp0_fd;
return 0;
}
/* Parses the contents of 'buf', which contains a "struct odp_vport" followed
* by Netlink attributes, into 'vport'. Returns 0 if successful, otherwise a
* positive errno value.
*
* 'vport' will contain pointers into 'buf', so the caller should not free
* 'buf' while 'vport' is still in use. */
static int
dpif_linux_vport_from_ofpbuf(struct dpif_linux_vport *vport,
const struct ofpbuf *buf)
{
static const struct nl_policy odp_vport_policy[] = {
[ODP_VPORT_ATTR_PORT_NO] = { .type = NL_A_U32 },
[ODP_VPORT_ATTR_TYPE] = { .type = NL_A_U32 },
[ODP_VPORT_ATTR_NAME] = { .type = NL_A_STRING, .max_len = IFNAMSIZ },
[ODP_VPORT_ATTR_STATS] = { .type = NL_A_UNSPEC,
.min_len = sizeof(struct rtnl_link_stats64),
.max_len = sizeof(struct rtnl_link_stats64),
.optional = true },
[ODP_VPORT_ATTR_ADDRESS] = { .type = NL_A_UNSPEC,
.min_len = ETH_ADDR_LEN,
.max_len = ETH_ADDR_LEN,
.optional = true },
[ODP_VPORT_ATTR_MTU] = { .type = NL_A_U32, .optional = true },
[ODP_VPORT_ATTR_OPTIONS] = { .type = NL_A_NESTED, .optional = true },
[ODP_VPORT_ATTR_IFINDEX] = { .type = NL_A_U32, .optional = true },
[ODP_VPORT_ATTR_IFLINK] = { .type = NL_A_U32, .optional = true },
};
struct odp_vport *odp_vport;
struct nlattr *a[ARRAY_SIZE(odp_vport_policy)];
dpif_linux_vport_init(vport);
if (!nl_policy_parse(buf, sizeof *odp_vport, odp_vport_policy,
a, ARRAY_SIZE(odp_vport_policy))) {
return EINVAL;
}
odp_vport = buf->data;
vport->dp_idx = odp_vport->dp_idx;
vport->port_no = nl_attr_get_u32(a[ODP_VPORT_ATTR_PORT_NO]);
vport->type = nl_attr_get_u32(a[ODP_VPORT_ATTR_TYPE]);
vport->name = nl_attr_get_string(a[ODP_VPORT_ATTR_NAME]);
if (a[ODP_VPORT_ATTR_STATS]) {
vport->stats = nl_attr_get(a[ODP_VPORT_ATTR_STATS]);
}
if (a[ODP_VPORT_ATTR_ADDRESS]) {
vport->address = nl_attr_get(a[ODP_VPORT_ATTR_ADDRESS]);
}
if (a[ODP_VPORT_ATTR_MTU]) {
vport->mtu = nl_attr_get_u32(a[ODP_VPORT_ATTR_MTU]);
}
if (a[ODP_VPORT_ATTR_OPTIONS]) {
vport->options = nl_attr_get(a[ODP_VPORT_ATTR_OPTIONS]);
vport->options_len = nl_attr_get_size(a[ODP_VPORT_ATTR_OPTIONS]);
}
if (a[ODP_VPORT_ATTR_IFINDEX]) {
vport->ifindex = nl_attr_get_u32(a[ODP_VPORT_ATTR_IFINDEX]);
}
if (a[ODP_VPORT_ATTR_IFLINK]) {
vport->iflink = nl_attr_get_u32(a[ODP_VPORT_ATTR_IFLINK]);
}
return 0;
}
/* Appends to 'buf' (which must initially be empty) a "struct odp_vport"
* followed by Netlink attributes corresponding to 'vport'. */
static void
dpif_linux_vport_to_ofpbuf(const struct dpif_linux_vport *vport,
struct ofpbuf *buf)
{
struct odp_vport *odp_vport;
ofpbuf_reserve(buf, sizeof odp_vport);
if (vport->port_no != UINT32_MAX) {
nl_msg_put_u32(buf, ODP_VPORT_ATTR_PORT_NO, vport->port_no);
}
if (vport->type != ODP_VPORT_TYPE_UNSPEC) {
nl_msg_put_u32(buf, ODP_VPORT_ATTR_TYPE, vport->type);
}
if (vport->name) {
nl_msg_put_string(buf, ODP_VPORT_ATTR_NAME, vport->name);
}
if (vport->stats) {
nl_msg_put_unspec(buf, ODP_VPORT_ATTR_STATS,
vport->stats, sizeof *vport->stats);
}
if (vport->address) {
nl_msg_put_unspec(buf, ODP_VPORT_ATTR_ADDRESS,
vport->address, ETH_ADDR_LEN);
}
if (vport->mtu) {
nl_msg_put_u32(buf, ODP_VPORT_ATTR_MTU, vport->mtu);
}
if (vport->options) {
nl_msg_put_nested(buf, ODP_VPORT_ATTR_OPTIONS,
vport->options, vport->options_len);
}
if (vport->ifindex) {
nl_msg_put_u32(buf, ODP_VPORT_ATTR_IFINDEX, vport->ifindex);
}
if (vport->iflink) {
nl_msg_put_u32(buf, ODP_VPORT_ATTR_IFLINK, vport->iflink);
}
odp_vport = ofpbuf_push_uninit(buf, sizeof *odp_vport);
odp_vport->dp_idx = vport->dp_idx;
odp_vport->len = buf->size;
odp_vport->total_len = (char *) ofpbuf_end(buf) - (char *) buf->data;
}
/* Clears 'vport' to "empty" values. */
void
dpif_linux_vport_init(struct dpif_linux_vport *vport)
{
memset(vport, 0, sizeof *vport);
vport->dp_idx = UINT32_MAX;
vport->port_no = UINT32_MAX;
}
/* Executes 'request' in the kernel datapath. If the command fails, returns a
* positive errno value. Otherwise, if 'reply' and 'bufp' are null, returns 0
* without doing anything else. If 'reply' and 'bufp' are nonnull, then the
* result of the command is expected to be an odp_vport also, which is decoded
* and stored in '*reply' and '*bufp'. The caller must free '*bufp' when the
* reply is no longer needed ('reply' will contain pointers into '*bufp'). */
int
dpif_linux_vport_transact(const struct dpif_linux_vport *request,
struct dpif_linux_vport *reply,
struct ofpbuf **bufp)
{
struct ofpbuf *buf = NULL;
int error;
int fd;
assert((reply != NULL) == (bufp != NULL));
error = get_dp0_fd(&fd);
if (error) {
goto error;
}
buf = ofpbuf_new(1024);
dpif_linux_vport_to_ofpbuf(request, buf);
error = ioctl(fd, request->cmd, buf->data) ? errno : 0;
if (error) {
goto error;
}
if (bufp) {
buf->size = ((struct odp_vport *) buf->data)->len;
error = dpif_linux_vport_from_ofpbuf(reply, buf);
if (error) {
goto error;
}
*bufp = buf;
} else {
ofpbuf_delete(buf);
}
return 0;
error:
ofpbuf_delete(buf);
if (bufp) {
memset(reply, 0, sizeof *reply);
*bufp = NULL;
}
return error;
}
/* Obtains information about the kernel vport named 'name' and stores it into
* '*reply' and '*bufp'. The caller must free '*bufp' when the reply is no
* longer needed ('reply' will contain pointers into '*bufp'). */
int
dpif_linux_vport_get(const char *name, struct dpif_linux_vport *reply,
struct ofpbuf **bufp)
{
struct dpif_linux_vport request;
dpif_linux_vport_init(&request);
request.cmd = ODP_VPORT_GET;
request.name = name;
return dpif_linux_vport_transact(&request, reply, bufp);
}
/* Parses the contents of 'buf', which contains a "struct odp_datapath"
* followed by Netlink attributes, into 'dp'. Returns 0 if successful,
* otherwise a positive errno value.
*
* 'dp' will contain pointers into 'buf', so the caller should not free 'buf'
* while 'dp' is still in use. */
static int
dpif_linux_dp_from_ofpbuf(struct dpif_linux_dp *dp, const struct ofpbuf *buf)
{
static const struct nl_policy odp_datapath_policy[] = {
[ODP_DP_ATTR_NAME] = { .type = NL_A_STRING, .max_len = IFNAMSIZ },
[ODP_DP_ATTR_STATS] = { .type = NL_A_UNSPEC,
.min_len = sizeof(struct odp_stats),
.max_len = sizeof(struct odp_stats),
.optional = true },
[ODP_DP_ATTR_IPV4_FRAGS] = { .type = NL_A_U32, .optional = true },
[ODP_DP_ATTR_SAMPLING] = { .type = NL_A_U32, .optional = true },
};
struct odp_datapath *odp_dp;
struct nlattr *a[ARRAY_SIZE(odp_datapath_policy)];
dpif_linux_dp_init(dp);
if (!nl_policy_parse(buf, sizeof *odp_dp, odp_datapath_policy,
a, ARRAY_SIZE(odp_datapath_policy))) {
return EINVAL;
}
odp_dp = buf->data;
dp->dp_idx = odp_dp->dp_idx;
dp->name = nl_attr_get_string(a[ODP_DP_ATTR_NAME]);
if (a[ODP_DP_ATTR_STATS]) {
/* Can't use structure assignment because Netlink doesn't ensure
* sufficient alignment for 64-bit members. */
memcpy(&dp->stats, nl_attr_get(a[ODP_DP_ATTR_STATS]),
sizeof dp->stats);
}
if (a[ODP_DP_ATTR_IPV4_FRAGS]) {
dp->ipv4_frags = nl_attr_get_u32(a[ODP_DP_ATTR_IPV4_FRAGS]);
}
if (a[ODP_DP_ATTR_SAMPLING]) {
dp->sampling = nl_attr_get(a[ODP_DP_ATTR_SAMPLING]);
}
return 0;
}
/* Appends to 'buf' (which must initially be empty) a "struct odp_datapath"
* followed by Netlink attributes corresponding to 'dp'. */
static void
dpif_linux_dp_to_ofpbuf(const struct dpif_linux_dp *dp, struct ofpbuf *buf)
{
struct odp_datapath *odp_dp;
ofpbuf_reserve(buf, sizeof odp_dp);
if (dp->name) {
nl_msg_put_string(buf, ODP_DP_ATTR_NAME, dp->name);
}
/* Skip ODP_DP_ATTR_STATS since we never have a reason to serialize it. */
if (dp->ipv4_frags) {
nl_msg_put_u32(buf, ODP_DP_ATTR_IPV4_FRAGS, dp->ipv4_frags);
}
if (dp->sampling) {
nl_msg_put_u32(buf, ODP_DP_ATTR_SAMPLING, *dp->sampling);
}
odp_dp = ofpbuf_push_uninit(buf, sizeof *odp_dp);
odp_dp->dp_idx = dp->dp_idx;
odp_dp->len = buf->size;
odp_dp->total_len = (char *) ofpbuf_end(buf) - (char *) buf->data;
}
/* Clears 'dp' to "empty" values. */
void
dpif_linux_dp_init(struct dpif_linux_dp *dp)
{
memset(dp, 0, sizeof *dp);
dp->dp_idx = -1;
}
/* Executes 'request' in the kernel datapath. If the command fails, returns a
* positive errno value. Otherwise, if 'reply' and 'bufp' are null, returns 0
* without doing anything else. If 'reply' and 'bufp' are nonnull, then the
* result of the command is expected to be an odp_datapath also, which is
* decoded and stored in '*reply' and '*bufp'. The caller must free '*bufp'
* when the reply is no longer needed ('reply' will contain pointers into
* '*bufp'). */
int
dpif_linux_dp_transact(const struct dpif_linux_dp *request,
struct dpif_linux_dp *reply, struct ofpbuf **bufp)
{
struct ofpbuf *buf = NULL;
int error;
int fd;
assert((reply != NULL) == (bufp != NULL));
error = get_dp0_fd(&fd);
if (error) {
goto error;
}
buf = ofpbuf_new(1024);
dpif_linux_dp_to_ofpbuf(request, buf);
error = ioctl(fd, request->cmd, buf->data) ? errno : 0;
if (error) {
goto error;
}
if (bufp) {
buf->size = ((struct odp_datapath *) buf->data)->len;
error = dpif_linux_dp_from_ofpbuf(reply, buf);
if (error) {
goto error;
}
*bufp = buf;
} else {
ofpbuf_delete(buf);
}
return 0;
error:
ofpbuf_delete(buf);
if (bufp) {
memset(reply, 0, sizeof *reply);
*bufp = NULL;
}
return error;
}
/* Obtains information about 'dpif_' and stores it into '*reply' and '*bufp'.
* The caller must free '*bufp' when the reply is no longer needed ('reply'
* will contain pointers into '*bufp'). */
int
dpif_linux_dp_get(const struct dpif *dpif_, struct dpif_linux_dp *reply,
struct ofpbuf **bufp)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_dp request;
dpif_linux_dp_init(&request);
request.cmd = ODP_DP_GET;
request.dp_idx = dpif->minor;
return dpif_linux_dp_transact(&request, reply, bufp);
}
/* Parses the contents of 'buf', which contains a "struct odp_flow" followed by
* Netlink attributes, into 'flow'. Returns 0 if successful, otherwise a
* positive errno value.
*
* 'flow' will contain pointers into 'buf', so the caller should not free 'buf'
* while 'flow' is still in use. */
static int
dpif_linux_flow_from_ofpbuf(struct dpif_linux_flow *flow,
const struct ofpbuf *buf)
{
static const struct nl_policy odp_flow_policy[] = {
[ODP_FLOW_ATTR_KEY] = { .type = NL_A_NESTED },
[ODP_FLOW_ATTR_ACTIONS] = { .type = NL_A_NESTED, .optional = true },
[ODP_FLOW_ATTR_STATS] = { .type = NL_A_UNSPEC,
.min_len = sizeof(struct odp_flow_stats),
.max_len = sizeof(struct odp_flow_stats),
.optional = true },
[ODP_FLOW_ATTR_TCP_FLAGS] = { .type = NL_A_U8, .optional = true },
[ODP_FLOW_ATTR_USED] = { .type = NL_A_U64, .optional = true },
/* The kernel never uses ODP_FLOW_ATTR_CLEAR. */
[ODP_FLOW_ATTR_STATE] = { .type = NL_A_U64, .optional = true },
};
struct odp_flow *odp_flow;
struct nlattr *a[ARRAY_SIZE(odp_flow_policy)];
dpif_linux_flow_init(flow);
if (!nl_policy_parse(buf, sizeof *odp_flow, odp_flow_policy,
a, ARRAY_SIZE(odp_flow_policy))) {
return EINVAL;
}
odp_flow = buf->data;
flow->nlmsg_flags = odp_flow->nlmsg_flags;
flow->dp_idx = odp_flow->dp_idx;
flow->key = nl_attr_get(a[ODP_FLOW_ATTR_KEY]);
flow->key_len = nl_attr_get_size(a[ODP_FLOW_ATTR_KEY]);
if (a[ODP_FLOW_ATTR_ACTIONS]) {
flow->actions = nl_attr_get(a[ODP_FLOW_ATTR_ACTIONS]);
flow->actions_len = nl_attr_get_size(a[ODP_FLOW_ATTR_ACTIONS]);
}
if (a[ODP_FLOW_ATTR_STATS]) {
flow->stats = nl_attr_get(a[ODP_FLOW_ATTR_STATS]);
}
if (a[ODP_FLOW_ATTR_TCP_FLAGS]) {
flow->tcp_flags = nl_attr_get(a[ODP_FLOW_ATTR_TCP_FLAGS]);
}
if (a[ODP_FLOW_ATTR_STATE]) {
flow->state = nl_attr_get(a[ODP_FLOW_ATTR_STATE]);
}
return 0;
}
/* Appends to 'buf' (which must initially be empty) a "struct odp_flow"
* followed by Netlink attributes corresponding to 'flow'. */
static void
dpif_linux_flow_to_ofpbuf(const struct dpif_linux_flow *flow,
struct ofpbuf *buf)
{
struct odp_flow *odp_flow;
ofpbuf_reserve(buf, sizeof odp_flow);
if (flow->key_len) {
nl_msg_put_unspec(buf, ODP_FLOW_ATTR_KEY, flow->key, flow->key_len);
}
if (flow->actions_len) {
nl_msg_put_unspec(buf, ODP_FLOW_ATTR_ACTIONS,
flow->actions, flow->actions_len);
}
/* We never need to send these to the kernel. */
assert(!flow->stats);
assert(!flow->tcp_flags);
assert(!flow->used);
if (flow->clear) {
nl_msg_put_flag(buf, ODP_FLOW_ATTR_CLEAR);
}
if (flow->state) {
nl_msg_put_u64(buf, ODP_FLOW_ATTR_STATE,
get_unaligned_u64(flow->state));
}
odp_flow = ofpbuf_push_uninit(buf, sizeof *odp_flow);
odp_flow->nlmsg_flags = flow->nlmsg_flags;
odp_flow->dp_idx = flow->dp_idx;
odp_flow->len = buf->size;
odp_flow->total_len = (char *) ofpbuf_end(buf) - (char *) buf->data;
}
/* Clears 'flow' to "empty" values. */
void
dpif_linux_flow_init(struct dpif_linux_flow *flow)
{
memset(flow, 0, sizeof *flow);
}
/* Executes 'request' in the kernel datapath. If the command fails, returns a
* positive errno value. Otherwise, if 'reply' and 'bufp' are null, returns 0
* without doing anything else. If 'reply' and 'bufp' are nonnull, then the
* result of the command is expected to be an odp_flow also, which is decoded
* and stored in '*reply' and '*bufp'. The caller must free '*bufp' when the
* reply is no longer needed ('reply' will contain pointers into '*bufp'). */
int
dpif_linux_flow_transact(const struct dpif_linux_flow *request,
struct dpif_linux_flow *reply, struct ofpbuf **bufp)
{
struct ofpbuf *buf = NULL;
int error;
int fd;
assert((reply != NULL) == (bufp != NULL));
error = get_dp0_fd(&fd);
if (error) {
goto error;
}
buf = ofpbuf_new(1024);
dpif_linux_flow_to_ofpbuf(request, buf);
error = ioctl(fd, request->cmd, buf->data) ? errno : 0;
if (error) {
goto error;
}
if (bufp) {
buf->size = ((struct odp_flow *) buf->data)->len;
error = dpif_linux_flow_from_ofpbuf(reply, buf);
if (error) {
goto error;
}
*bufp = buf;
} else {
ofpbuf_delete(buf);
}
return 0;
error:
ofpbuf_delete(buf);
if (bufp) {
memset(reply, 0, sizeof *reply);
*bufp = NULL;
}
return error;
}
static void
dpif_linux_flow_get_stats(const struct dpif_linux_flow *flow,
struct dpif_flow_stats *stats)
{
if (flow->stats) {
stats->n_packets = get_unaligned_u64(&flow->stats->n_packets);
stats->n_bytes = get_unaligned_u64(&flow->stats->n_bytes);
} else {
stats->n_packets = 0;
stats->n_bytes = 0;
}
stats->used = flow->used ? get_unaligned_u64(flow->used) : 0;
stats->tcp_flags = flow->tcp_flags ? *flow->tcp_flags : 0;
}
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