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ovs/lib/dpif-linux.c
Ethan Jackson 18a2378164 notifiers: Rename run and wait functions. 
It makes more sense to call nln_notifier_run() and
nln_notifier_wait() simply nln_run() and nln_wait() since they
don't operate on notifiers but the entire nln object.  This patch
changes the nln and the rtnetlink-link modules to the new
convention.
2011-09-16 11:22:30 -07:00

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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/pkt_sched.h>
#include <linux/rtnetlink.h>
#include <linux/sockios.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include "bitmap.h"
#include "dpif-provider.h"
#include "dynamic-string.h"
#include "flow.h"
#include "netdev.h"
#include "netdev-linux.h"
#include "netdev-vport.h"
#include "netlink-notifier.h"
#include "netlink-socket.h"
#include "netlink.h"
#include "odp-util.h"
#include "ofpbuf.h"
#include "openvswitch/tunnel.h"
#include "packets.h"
#include "poll-loop.h"
#include "shash.h"
#include "sset.h"
#include "unaligned.h"
#include "util.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(dpif_linux);
enum { LRU_MAX_PORTS = 1024 };
enum { LRU_MASK = LRU_MAX_PORTS - 1};
BUILD_ASSERT_DECL(IS_POW2(LRU_MAX_PORTS));
/* This ethtool flag was introduced in Linux 2.6.24, so it might be
* missing if we have old headers. */
#define ETH_FLAG_LRO (1 << 15) /* LRO is enabled */
struct dpif_linux_dp {
/* Generic Netlink header. */
uint8_t cmd;
/* struct ovs_header. */
int dp_ifindex;
/* Attributes. */
const char *name; /* OVS_DP_ATTR_NAME. */
struct ovs_dp_stats stats; /* OVS_DP_ATTR_STATS. */
enum ovs_frag_handling ipv4_frags; /* OVS_DP_ATTR_IPV4_FRAGS. */
const uint32_t *sampling; /* OVS_DP_ATTR_SAMPLING. */
uint32_t mcgroups[DPIF_N_UC_TYPES]; /* OVS_DP_ATTR_MCGROUPS. */
};
static void dpif_linux_dp_init(struct dpif_linux_dp *);
static int dpif_linux_dp_from_ofpbuf(struct dpif_linux_dp *,
const struct ofpbuf *);
static void dpif_linux_dp_dump_start(struct nl_dump *);
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 {
/* Generic Netlink header. */
uint8_t cmd;
/* struct ovs_header. */
unsigned int nlmsg_flags;
int dp_ifindex;
/* Attributes.
*
* The 'stats' and 'used' 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.
*
* If 'actions' is nonnull then OVS_FLOW_ATTR_ACTIONS will be included in
* the Netlink version of the command, even if actions_len is zero. */
const struct nlattr *key; /* OVS_FLOW_ATTR_KEY. */
size_t key_len;
const struct nlattr *actions; /* OVS_FLOW_ATTR_ACTIONS. */
size_t actions_len;
const struct ovs_flow_stats *stats; /* OVS_FLOW_ATTR_STATS. */
const uint8_t *tcp_flags; /* OVS_FLOW_ATTR_TCP_FLAGS. */
const uint64_t *used; /* OVS_FLOW_ATTR_USED. */
bool clear; /* OVS_FLOW_ATTR_CLEAR. */
};
static void dpif_linux_flow_init(struct dpif_linux_flow *);
static int dpif_linux_flow_from_ofpbuf(struct dpif_linux_flow *,
const struct ofpbuf *);
static void dpif_linux_flow_to_ofpbuf(const struct dpif_linux_flow *,
struct ofpbuf *);
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 dp_ifindex;
/* Multicast group messages. */
struct nl_sock *mc_sock;
uint32_t mcgroups[DPIF_N_UC_TYPES];
unsigned int listen_mask;
/* Change notification. */
struct sset changed_ports; /* Ports that have changed. */
struct nln_notifier port_notifier;
bool change_error;
/* Queue of unused ports. */
unsigned long *lru_bitmap;
uint16_t lru_ports[LRU_MAX_PORTS];
size_t lru_head;
size_t lru_tail;
};
static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5);
/* Generic Netlink family numbers for OVS. */
static int ovs_datapath_family;
static int ovs_vport_family;
static int ovs_flow_family;
static int ovs_packet_family;
/* Generic Netlink socket. */
static struct nl_sock *genl_sock;
static struct nln *nln = NULL;
static int dpif_linux_init(void);
static int open_dpif(const struct dpif_linux_dp *, struct dpif **);
static bool dpif_linux_nln_parse(struct ofpbuf *, void *);
static void dpif_linux_port_changed(const void *vport, void *dpif);
static void dpif_linux_vport_to_ofpbuf(const struct dpif_linux_vport *,
struct ofpbuf *);
static int dpif_linux_vport_from_ofpbuf(struct dpif_linux_vport *,
const struct ofpbuf *);
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 void
dpif_linux_push_port(struct dpif_linux *dp, uint16_t port)
{
if (port < LRU_MAX_PORTS && !bitmap_is_set(dp->lru_bitmap, port)) {
bitmap_set1(dp->lru_bitmap, port);
dp->lru_ports[dp->lru_head++ & LRU_MASK] = port;
}
}
static uint32_t
dpif_linux_pop_port(struct dpif_linux *dp)
{
uint16_t port;
if (dp->lru_head == dp->lru_tail) {
return UINT32_MAX;
}
port = dp->lru_ports[dp->lru_tail++ & LRU_MASK];
bitmap_set0(dp->lru_bitmap, port);
return port;
}
static int
dpif_linux_enumerate(struct sset *all_dps)
{
struct nl_dump dump;
struct ofpbuf msg;
int error;
error = dpif_linux_init();
if (error) {
return error;
}
dpif_linux_dp_dump_start(&dump);
while (nl_dump_next(&dump, &msg)) {
struct dpif_linux_dp dp;
if (!dpif_linux_dp_from_ofpbuf(&dp, &msg)) {
sset_add(all_dps, dp.name);
}
}
return nl_dump_done(&dump);
}
static int
dpif_linux_open(const struct dpif_class *class OVS_UNUSED, const char *name,
bool create, struct dpif **dpifp)
{
struct dpif_linux_dp dp_request, dp;
struct ofpbuf *buf;
int error;
error = dpif_linux_init();
if (error) {
return error;
}
/* Create or look up datapath. */
dpif_linux_dp_init(&dp_request);
dp_request.cmd = create ? OVS_DP_CMD_NEW : OVS_DP_CMD_GET;
dp_request.name = name;
error = dpif_linux_dp_transact(&dp_request, &dp, &buf);
if (error) {
return error;
}
error = open_dpif(&dp, dpifp);
ofpbuf_delete(buf);
return error;
}
static int
open_dpif(const struct dpif_linux_dp *dp, struct dpif **dpifp)
{
struct dpif_linux *dpif;
int error;
int i;
dpif = xmalloc(sizeof *dpif);
error = nln_notifier_register(nln, &dpif->port_notifier,
dpif_linux_port_changed, dpif);
if (error) {
goto error_free;
}
dpif_init(&dpif->dpif, &dpif_linux_class, dp->name,
dp->dp_ifindex, dp->dp_ifindex);
dpif->mc_sock = NULL;
for (i = 0; i < DPIF_N_UC_TYPES; i++) {
dpif->mcgroups[i] = dp->mcgroups[i];
}
dpif->listen_mask = 0;
dpif->dp_ifindex = dp->dp_ifindex;
sset_init(&dpif->changed_ports);
dpif->change_error = false;
*dpifp = &dpif->dpif;
dpif->lru_head = dpif->lru_tail = 0;
dpif->lru_bitmap = bitmap_allocate(LRU_MAX_PORTS);
bitmap_set1(dpif->lru_bitmap, OVSP_LOCAL);
for (i = 1; i < LRU_MAX_PORTS; i++) {
dpif_linux_push_port(dpif, i);
}
return 0;
error_free:
free(dpif);
return error;
}
static void
dpif_linux_close(struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
if (nln) {
nln_notifier_unregister(nln, &dpif->port_notifier);
}
nl_sock_destroy(dpif->mc_sock);
sset_destroy(&dpif->changed_ports);
free(dpif->lru_bitmap);
free(dpif);
}
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 = OVS_DP_CMD_DEL;
dp.dp_ifindex = dpif->dp_ifindex;
return dpif_linux_dp_transact(&dp, NULL, NULL);
}
static void
dpif_linux_run(struct dpif *dpif OVS_UNUSED)
{
if (nln) {
nln_run(nln);
}
}
static void
dpif_linux_wait(struct dpif *dpif OVS_UNUSED)
{
if (nln) {
nln_wait(nln);
}
}
static int
dpif_linux_get_stats(const struct dpif *dpif_, struct ovs_dp_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 == OVS_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 = OVS_DP_CMD_SET;
dp.dp_ifindex = dpif->dp_ifindex;
dp.ipv4_frags = drop_frags ? OVS_DP_FRAG_DROP : OVS_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 = OVS_VPORT_CMD_NEW;
request.dp_ifindex = dpif->dp_ifindex;
request.type = netdev_vport_get_vport_type(netdev);
if (request.type == OVS_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;
}
if (request.type == OVS_VPORT_TYPE_NETDEV) {
netdev_linux_ethtool_set_flag(netdev, ETH_FLAG_LRO, "LRO", false);
}
/* Loop until we find a port that isn't used. */
do {
request.port_no = dpif_linux_pop_port(dpif);
error = dpif_linux_vport_transact(&request, &reply, &buf);
if (!error) {
*port_nop = reply.port_no;
}
ofpbuf_delete(buf);
} while (request.port_no != UINT32_MAX
&& (error == EBUSY || error == EFBIG));
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;
int error;
dpif_linux_vport_init(&vport);
vport.cmd = OVS_VPORT_CMD_DEL;
vport.dp_ifindex = dpif->dp_ifindex;
vport.port_no = port_no;
error = dpif_linux_vport_transact(&vport, NULL, NULL);
if (!error) {
dpif_linux_push_port(dpif, port_no);
}
return error;
}
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 = OVS_VPORT_CMD_GET;
request.dp_ifindex = dpif_linux_cast(dpif)->dp_ifindex;
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_);
struct dpif_linux_flow flow;
dpif_linux_flow_init(&flow);
flow.cmd = OVS_FLOW_CMD_DEL;
flow.dp_ifindex = dpif->dp_ifindex;
return dpif_linux_flow_transact(&flow, NULL, NULL);
}
struct dpif_linux_port_state {
struct nl_dump dump;
unsigned long *port_bitmap; /* Ports in the datapath. */
bool complete; /* Dump completed without error. */
};
static int
dpif_linux_port_dump_start(const struct dpif *dpif_, void **statep)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_port_state *state;
struct dpif_linux_vport request;
struct ofpbuf *buf;
*statep = state = xmalloc(sizeof *state);
state->port_bitmap = bitmap_allocate(LRU_MAX_PORTS);
state->complete = false;
dpif_linux_vport_init(&request);
request.cmd = OVS_DP_CMD_GET;
request.dp_ifindex = dpif->dp_ifindex;
buf = ofpbuf_new(1024);
dpif_linux_vport_to_ofpbuf(&request, buf);
nl_dump_start(&state->dump, genl_sock, buf);
ofpbuf_delete(buf);
return 0;
}
static int
dpif_linux_port_dump_next(const struct dpif *dpif OVS_UNUSED, void *state_,
struct dpif_port *dpif_port)
{
struct dpif_linux_port_state *state = state_;
struct dpif_linux_vport vport;
struct ofpbuf buf;
int error;
if (!nl_dump_next(&state->dump, &buf)) {
state->complete = true;
return EOF;
}
error = dpif_linux_vport_from_ofpbuf(&vport, &buf);
if (error) {
return error;
}
if (vport.port_no < LRU_MAX_PORTS) {
bitmap_set1(state->port_bitmap, vport.port_no);
}
dpif_port->name = (char *) vport.name;
dpif_port->type = (char *) netdev_vport_get_netdev_type(&vport);
dpif_port->port_no = vport.port_no;
return 0;
}
static int
dpif_linux_port_dump_done(const struct dpif *dpif_, void *state_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_port_state *state = state_;
int error = nl_dump_done(&state->dump);
if (state->complete) {
uint16_t i;
for (i = 0; i < LRU_MAX_PORTS; i++) {
if (!bitmap_is_set(state->port_bitmap, i)) {
dpif_linux_push_port(dpif, i);
}
}
}
free(state->port_bitmap);
free(state);
return error;
}
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;
sset_clear(&dpif->changed_ports);
return ENOBUFS;
} else if (!sset_is_empty(&dpif->changed_ports)) {
*devnamep = sset_pop(&dpif->changed_ports);
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 (!sset_is_empty(&dpif->changed_ports) || dpif->change_error) {
poll_immediate_wake();
}
}
static int
dpif_linux_flow_get__(const struct dpif *dpif_,
const struct nlattr *key, size_t key_len,
struct dpif_linux_flow *reply, struct ofpbuf **bufp)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_flow request;
dpif_linux_flow_init(&request);
request.cmd = OVS_FLOW_CMD_GET;
request.dp_ifindex = dpif->dp_ifindex;
request.key = key;
request.key_len = key_len;
return dpif_linux_flow_transact(&request, reply, bufp);
}
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_flow reply;
struct ofpbuf *buf;
int error;
error = dpif_linux_flow_get__(dpif_, key, key_len, &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 nlattr dummy_action;
struct ofpbuf *buf;
int error;
dpif_linux_flow_init(&request);
request.cmd = flags & DPIF_FP_CREATE ? OVS_FLOW_CMD_NEW : OVS_FLOW_CMD_SET;
request.dp_ifindex = dpif->dp_ifindex;
request.key = key;
request.key_len = key_len;
/* Ensure that OVS_FLOW_ATTR_ACTIONS will always be included. */
request.actions = actions ? actions : &dummy_action;
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 = OVS_FLOW_CMD_DEL;
request.dp_ifindex = dpif->dp_ifindex;
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 nl_dump dump;
struct dpif_linux_flow flow;
struct dpif_flow_stats stats;
struct ofpbuf *buf;
};
static int
dpif_linux_flow_dump_start(const struct dpif *dpif_, void **statep)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_flow_state *state;
struct dpif_linux_flow request;
struct ofpbuf *buf;
*statep = state = xmalloc(sizeof *state);
dpif_linux_flow_init(&request);
request.cmd = OVS_DP_CMD_GET;
request.dp_ifindex = dpif->dp_ifindex;
buf = ofpbuf_new(1024);
dpif_linux_flow_to_ofpbuf(&request, buf);
nl_dump_start(&state->dump, genl_sock, buf);
ofpbuf_delete(buf);
state->buf = NULL;
return 0;
}
static int
dpif_linux_flow_dump_next(const struct dpif *dpif_ OVS_UNUSED, 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_flow_state *state = state_;
struct ofpbuf buf;
int error;
do {
ofpbuf_delete(state->buf);
state->buf = NULL;
if (!nl_dump_next(&state->dump, &buf)) {
return EOF;
}
error = dpif_linux_flow_from_ofpbuf(&state->flow, &buf);
if (error) {
return error;
}
if (actions && !state->flow.actions) {
error = dpif_linux_flow_get__(dpif_, state->flow.key,
state->flow.key_len,
&state->flow, &state->buf);
if (error == ENOENT) {
VLOG_DBG("dumped flow disappeared on get");
} else if (error) {
VLOG_WARN("error fetching dumped flow: %s", strerror(error));
}
}
} while (error);
if (actions) {
*actions = state->flow.actions;
*actions_len = state->flow.actions_len;
}
if (key) {
*key = state->flow.key;
*key_len = state->flow.key_len;
}
if (stats) {
dpif_linux_flow_get_stats(&state->flow, &state->stats);
*stats = &state->stats;
}
return error;
}
static int
dpif_linux_flow_dump_done(const struct dpif *dpif OVS_UNUSED, void *state_)
{
struct dpif_linux_flow_state *state = state_;
int error = nl_dump_done(&state->dump);
ofpbuf_delete(state->buf);
free(state);
return error;
}
static int
dpif_linux_execute__(int dp_ifindex,
const struct nlattr *key, size_t key_len,
const struct nlattr *actions, size_t actions_len,
const struct ofpbuf *packet)
{
struct ovs_header *execute;
struct ofpbuf *buf;
int error;
buf = ofpbuf_new(128 + actions_len + packet->size);
nl_msg_put_genlmsghdr(buf, 0, ovs_packet_family, NLM_F_REQUEST,
OVS_PACKET_CMD_EXECUTE, 1);
execute = ofpbuf_put_uninit(buf, sizeof *execute);
execute->dp_ifindex = dp_ifindex;
nl_msg_put_unspec(buf, OVS_PACKET_ATTR_PACKET, packet->data, packet->size);
nl_msg_put_unspec(buf, OVS_PACKET_ATTR_KEY, key, key_len);
nl_msg_put_unspec(buf, OVS_PACKET_ATTR_ACTIONS, actions, actions_len);
error = nl_sock_transact(genl_sock, buf, NULL);
ofpbuf_delete(buf);
return error;
}
static int
dpif_linux_execute(struct dpif *dpif_,
const struct nlattr *key, size_t key_len,
const struct nlattr *actions, size_t actions_len,
const struct ofpbuf *packet)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
return dpif_linux_execute__(dpif->dp_ifindex, key, key_len,
actions, actions_len, packet);
}
static int
dpif_linux_recv_get_mask(const struct dpif *dpif_, int *listen_mask)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
*listen_mask = dpif->listen_mask;
return 0;
}
static int
dpif_linux_recv_set_mask(struct dpif *dpif_, int listen_mask)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
int error;
int i;
if (listen_mask == dpif->listen_mask) {
return 0;
} else if (!listen_mask) {
nl_sock_destroy(dpif->mc_sock);
dpif->mc_sock = NULL;
dpif->listen_mask = 0;
return 0;
} else if (!dpif->mc_sock) {
error = nl_sock_create(NETLINK_GENERIC, &dpif->mc_sock);
if (error) {
return error;
}
}
/* Unsubscribe from old groups. */
for (i = 0; i < DPIF_N_UC_TYPES; i++) {
if (dpif->listen_mask & (1u << i)) {
nl_sock_leave_mcgroup(dpif->mc_sock, dpif->mcgroups[i]);
}
}
/* Update listen_mask. */
dpif->listen_mask = listen_mask;
/* Subscribe to new groups. */
error = 0;
for (i = 0; i < DPIF_N_UC_TYPES; i++) {
if (dpif->listen_mask & (1u << i)) {
int retval;
retval = nl_sock_join_mcgroup(dpif->mc_sock, dpif->mcgroups[i]);
if (retval) {
error = retval;
}
}
}
return error;
}
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 = OVS_DP_CMD_SET;
dp.dp_ifindex = dpif->dp_ifindex;
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,
int *dp_ifindex)
{
static const struct nl_policy ovs_packet_policy[] = {
/* Always present. */
[OVS_PACKET_ATTR_PACKET] = { .type = NL_A_UNSPEC,
.min_len = ETH_HEADER_LEN },
[OVS_PACKET_ATTR_KEY] = { .type = NL_A_NESTED },
/* OVS_PACKET_CMD_ACTION only. */
[OVS_PACKET_ATTR_USERDATA] = { .type = NL_A_U64, .optional = true },
/* OVS_PACKET_CMD_SAMPLE only. */
[OVS_PACKET_ATTR_SAMPLE_POOL] = { .type = NL_A_U32, .optional = true },
[OVS_PACKET_ATTR_ACTIONS] = { .type = NL_A_NESTED, .optional = true },
};
struct ovs_header *ovs_header;
struct nlattr *a[ARRAY_SIZE(ovs_packet_policy)];
struct nlmsghdr *nlmsg;
struct genlmsghdr *genl;
struct ofpbuf b;
int type;
ofpbuf_use_const(&b, buf->data, buf->size);
nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
genl = ofpbuf_try_pull(&b, sizeof *genl);
ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
if (!nlmsg || !genl || !ovs_header
|| nlmsg->nlmsg_type != ovs_packet_family
|| !nl_policy_parse(&b, 0, ovs_packet_policy, a,
ARRAY_SIZE(ovs_packet_policy))) {
return EINVAL;
}
type = (genl->cmd == OVS_PACKET_CMD_MISS ? DPIF_UC_MISS
: genl->cmd == OVS_PACKET_CMD_ACTION ? DPIF_UC_ACTION
: genl->cmd == OVS_PACKET_CMD_SAMPLE ? DPIF_UC_SAMPLE
: -1);
if (type < 0) {
return EINVAL;
}
memset(upcall, 0, sizeof *upcall);
upcall->type = type;
upcall->packet = buf;
upcall->packet->data = (void *) nl_attr_get(a[OVS_PACKET_ATTR_PACKET]);
upcall->packet->size = nl_attr_get_size(a[OVS_PACKET_ATTR_PACKET]);
upcall->key = (void *) nl_attr_get(a[OVS_PACKET_ATTR_KEY]);
upcall->key_len = nl_attr_get_size(a[OVS_PACKET_ATTR_KEY]);
upcall->userdata = (a[OVS_PACKET_ATTR_USERDATA]
? nl_attr_get_u64(a[OVS_PACKET_ATTR_USERDATA])
: 0);
upcall->sample_pool = (a[OVS_PACKET_ATTR_SAMPLE_POOL]
? nl_attr_get_u32(a[OVS_PACKET_ATTR_SAMPLE_POOL])
: 0);
if (a[OVS_PACKET_ATTR_ACTIONS]) {
upcall->actions = (void *) nl_attr_get(a[OVS_PACKET_ATTR_ACTIONS]);
upcall->actions_len = nl_attr_get_size(a[OVS_PACKET_ATTR_ACTIONS]);
}
*dp_ifindex = ovs_header->dp_ifindex;
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 error;
int i;
if (!dpif->mc_sock) {
return EAGAIN;
}
for (i = 0; i < 50; i++) {
int dp_ifindex;
error = nl_sock_recv(dpif->mc_sock, &buf, false);
if (error) {
return error;
}
error = parse_odp_packet(buf, upcall, &dp_ifindex);
if (!error
&& dp_ifindex == dpif->dp_ifindex
&& dpif->listen_mask & (1u << upcall->type)) {
return 0;
}
ofpbuf_delete(buf);
if (error) {
return error;
}
}
return EAGAIN;
}
static void
dpif_linux_recv_wait(struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
if (dpif->mc_sock) {
nl_sock_wait(dpif->mc_sock, POLLIN);
}
}
static void
dpif_linux_recv_purge(struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
if (dpif->mc_sock) {
nl_sock_drain(dpif->mc_sock);
}
}
const struct dpif_class dpif_linux_class = {
"system",
dpif_linux_enumerate,
dpif_linux_open,
dpif_linux_close,
dpif_linux_destroy,
dpif_linux_run,
dpif_linux_wait,
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
dpif_linux_init(void)
{
static int error = -1;
if (error < 0) {
unsigned int ovs_vport_mcgroup;
error = nl_lookup_genl_family(OVS_DATAPATH_FAMILY,
&ovs_datapath_family);
if (error) {
VLOG_ERR("Generic Netlink family '%s' does not exist. "
"The Open vSwitch kernel module is probably not loaded.",
OVS_DATAPATH_FAMILY);
}
if (!error) {
error = nl_lookup_genl_family(OVS_VPORT_FAMILY, &ovs_vport_family);
}
if (!error) {
error = nl_lookup_genl_family(OVS_FLOW_FAMILY, &ovs_flow_family);
}
if (!error) {
error = nl_lookup_genl_family(OVS_PACKET_FAMILY,
&ovs_packet_family);
}
if (!error) {
error = nl_sock_create(NETLINK_GENERIC, &genl_sock);
}
if (!error) {
error = nl_lookup_genl_mcgroup(OVS_VPORT_FAMILY, OVS_VPORT_MCGROUP,
&ovs_vport_mcgroup);
}
if (!error) {
static struct dpif_linux_vport vport;
nln = nln_create(NETLINK_GENERIC, ovs_vport_mcgroup,
dpif_linux_nln_parse, &vport);
}
}
return error;
}
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 && error != ENOENT) {
VLOG_WARN_RL(&error_rl, "%s: vport query failed (%s)",
name, strerror(error));
}
return reply.type == OVS_VPORT_TYPE_INTERNAL;
}
int
dpif_linux_vport_send(int dp_ifindex, uint32_t port_no,
const void *data, size_t size)
{
struct ofpbuf actions, key, packet;
struct odputil_keybuf keybuf;
struct flow flow;
uint64_t action;
ofpbuf_use_const(&packet, data, size);
flow_extract(&packet, htonll(0), 0, &flow);
ofpbuf_use_stack(&key, &keybuf, sizeof keybuf);
odp_flow_key_from_flow(&key, &flow);
ofpbuf_use_stack(&actions, &action, sizeof action);
nl_msg_put_u32(&actions, OVS_ACTION_ATTR_OUTPUT, port_no);
return dpif_linux_execute__(dp_ifindex, key.data, key.size,
actions.data, actions.size, &packet);
}
static bool
dpif_linux_nln_parse(struct ofpbuf *buf, void *vport_)
{
struct dpif_linux_vport *vport = vport_;
return dpif_linux_vport_from_ofpbuf(vport, buf) == 0;
}
static void
dpif_linux_port_changed(const void *vport_, void *dpif_)
{
const struct dpif_linux_vport *vport = vport_;
struct dpif_linux *dpif = dpif_;
if (vport) {
if (vport->dp_ifindex == dpif->dp_ifindex
&& (vport->cmd == OVS_VPORT_CMD_NEW
|| vport->cmd == OVS_VPORT_CMD_DEL
|| vport->cmd == OVS_VPORT_CMD_SET)) {
VLOG_DBG("port_changed: dpif:%s vport:%s cmd:%"PRIu8,
dpif->dpif.full_name, vport->name, vport->cmd);
sset_add(&dpif->changed_ports, vport->name);
}
} else {
dpif->change_error = true;
}
}
/* Parses the contents of 'buf', which contains a "struct ovs_header" 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 ovs_vport_policy[] = {
[OVS_VPORT_ATTR_PORT_NO] = { .type = NL_A_U32 },
[OVS_VPORT_ATTR_TYPE] = { .type = NL_A_U32 },
[OVS_VPORT_ATTR_NAME] = { .type = NL_A_STRING, .max_len = IFNAMSIZ },
[OVS_VPORT_ATTR_STATS] = { .type = NL_A_UNSPEC,
.min_len = sizeof(struct ovs_vport_stats),
.max_len = sizeof(struct ovs_vport_stats),
.optional = true },
[OVS_VPORT_ATTR_ADDRESS] = { .type = NL_A_UNSPEC,
.min_len = ETH_ADDR_LEN,
.max_len = ETH_ADDR_LEN,
.optional = true },
[OVS_VPORT_ATTR_OPTIONS] = { .type = NL_A_NESTED, .optional = true },
[OVS_VPORT_ATTR_IFINDEX] = { .type = NL_A_U32, .optional = true },
};
struct nlattr *a[ARRAY_SIZE(ovs_vport_policy)];
struct ovs_header *ovs_header;
struct nlmsghdr *nlmsg;
struct genlmsghdr *genl;
struct ofpbuf b;
dpif_linux_vport_init(vport);
ofpbuf_use_const(&b, buf->data, buf->size);
nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
genl = ofpbuf_try_pull(&b, sizeof *genl);
ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
if (!nlmsg || !genl || !ovs_header
|| nlmsg->nlmsg_type != ovs_vport_family
|| !nl_policy_parse(&b, 0, ovs_vport_policy, a,
ARRAY_SIZE(ovs_vport_policy))) {
return EINVAL;
}
vport->cmd = genl->cmd;
vport->dp_ifindex = ovs_header->dp_ifindex;
vport->port_no = nl_attr_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
vport->type = nl_attr_get_u32(a[OVS_VPORT_ATTR_TYPE]);
vport->name = nl_attr_get_string(a[OVS_VPORT_ATTR_NAME]);
if (a[OVS_VPORT_ATTR_STATS]) {
vport->stats = nl_attr_get(a[OVS_VPORT_ATTR_STATS]);
}
if (a[OVS_VPORT_ATTR_ADDRESS]) {
vport->address = nl_attr_get(a[OVS_VPORT_ATTR_ADDRESS]);
}
if (a[OVS_VPORT_ATTR_OPTIONS]) {
vport->options = nl_attr_get(a[OVS_VPORT_ATTR_OPTIONS]);
vport->options_len = nl_attr_get_size(a[OVS_VPORT_ATTR_OPTIONS]);
}
if (a[OVS_VPORT_ATTR_IFINDEX]) {
vport->ifindex = nl_attr_get_u32(a[OVS_VPORT_ATTR_IFINDEX]);
}
return 0;
}
/* Appends to 'buf' (which must initially be empty) a "struct ovs_header"
* followed by Netlink attributes corresponding to 'vport'. */
static void
dpif_linux_vport_to_ofpbuf(const struct dpif_linux_vport *vport,
struct ofpbuf *buf)
{
struct ovs_header *ovs_header;
nl_msg_put_genlmsghdr(buf, 0, ovs_vport_family, NLM_F_REQUEST | NLM_F_ECHO,
vport->cmd, 1);
ovs_header = ofpbuf_put_uninit(buf, sizeof *ovs_header);
ovs_header->dp_ifindex = vport->dp_ifindex;
if (vport->port_no != UINT32_MAX) {
nl_msg_put_u32(buf, OVS_VPORT_ATTR_PORT_NO, vport->port_no);
}
if (vport->type != OVS_VPORT_TYPE_UNSPEC) {
nl_msg_put_u32(buf, OVS_VPORT_ATTR_TYPE, vport->type);
}
if (vport->name) {
nl_msg_put_string(buf, OVS_VPORT_ATTR_NAME, vport->name);
}
if (vport->stats) {
nl_msg_put_unspec(buf, OVS_VPORT_ATTR_STATS,
vport->stats, sizeof *vport->stats);
}
if (vport->address) {
nl_msg_put_unspec(buf, OVS_VPORT_ATTR_ADDRESS,
vport->address, ETH_ADDR_LEN);
}
if (vport->options) {
nl_msg_put_nested(buf, OVS_VPORT_ATTR_OPTIONS,
vport->options, vport->options_len);
}
if (vport->ifindex) {
nl_msg_put_u32(buf, OVS_VPORT_ATTR_IFINDEX, vport->ifindex);
}
}
/* Clears 'vport' to "empty" values. */
void
dpif_linux_vport_init(struct dpif_linux_vport *vport)
{
memset(vport, 0, sizeof *vport);
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 ovs_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 *request_buf;
int error;
assert((reply != NULL) == (bufp != NULL));
error = dpif_linux_init();
if (error) {
if (reply) {
*bufp = NULL;
dpif_linux_vport_init(reply);
}
return error;
}
request_buf = ofpbuf_new(1024);
dpif_linux_vport_to_ofpbuf(request, request_buf);
error = nl_sock_transact(genl_sock, request_buf, bufp);
ofpbuf_delete(request_buf);
if (reply) {
if (!error) {
error = dpif_linux_vport_from_ofpbuf(reply, *bufp);
}
if (error) {
dpif_linux_vport_init(reply);
ofpbuf_delete(*bufp);
*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 = OVS_VPORT_CMD_GET;
request.name = name;
return dpif_linux_vport_transact(&request, reply, bufp);
}
/* Parses the contents of 'buf', which contains a "struct ovs_header" 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 ovs_datapath_policy[] = {
[OVS_DP_ATTR_NAME] = { .type = NL_A_STRING, .max_len = IFNAMSIZ },
[OVS_DP_ATTR_STATS] = { .type = NL_A_UNSPEC,
.min_len = sizeof(struct ovs_dp_stats),
.max_len = sizeof(struct ovs_dp_stats),
.optional = true },
[OVS_DP_ATTR_IPV4_FRAGS] = { .type = NL_A_U32, .optional = true },
[OVS_DP_ATTR_SAMPLING] = { .type = NL_A_U32, .optional = true },
[OVS_DP_ATTR_MCGROUPS] = { .type = NL_A_NESTED, .optional = true },
};
struct nlattr *a[ARRAY_SIZE(ovs_datapath_policy)];
struct ovs_header *ovs_header;
struct nlmsghdr *nlmsg;
struct genlmsghdr *genl;
struct ofpbuf b;
dpif_linux_dp_init(dp);
ofpbuf_use_const(&b, buf->data, buf->size);
nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
genl = ofpbuf_try_pull(&b, sizeof *genl);
ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
if (!nlmsg || !genl || !ovs_header
|| nlmsg->nlmsg_type != ovs_datapath_family
|| !nl_policy_parse(&b, 0, ovs_datapath_policy, a,
ARRAY_SIZE(ovs_datapath_policy))) {
return EINVAL;
}
dp->cmd = genl->cmd;
dp->dp_ifindex = ovs_header->dp_ifindex;
dp->name = nl_attr_get_string(a[OVS_DP_ATTR_NAME]);
if (a[OVS_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[OVS_DP_ATTR_STATS]),
sizeof dp->stats);
}
if (a[OVS_DP_ATTR_IPV4_FRAGS]) {
dp->ipv4_frags = nl_attr_get_u32(a[OVS_DP_ATTR_IPV4_FRAGS]);
}
if (a[OVS_DP_ATTR_SAMPLING]) {
dp->sampling = nl_attr_get(a[OVS_DP_ATTR_SAMPLING]);
}
if (a[OVS_DP_ATTR_MCGROUPS]) {
static const struct nl_policy ovs_mcgroup_policy[] = {
[OVS_PACKET_CMD_MISS] = { .type = NL_A_U32, .optional = true },
[OVS_PACKET_CMD_ACTION] = { .type = NL_A_U32, .optional = true },
[OVS_PACKET_CMD_SAMPLE] = { .type = NL_A_U32, .optional = true },
};
struct nlattr *mcgroups[ARRAY_SIZE(ovs_mcgroup_policy)];
if (!nl_parse_nested(a[OVS_DP_ATTR_MCGROUPS], ovs_mcgroup_policy,
mcgroups, ARRAY_SIZE(ovs_mcgroup_policy))) {
return EINVAL;
}
if (mcgroups[OVS_PACKET_CMD_MISS]) {
dp->mcgroups[DPIF_UC_MISS]
= nl_attr_get_u32(mcgroups[OVS_PACKET_CMD_MISS]);
}
if (mcgroups[OVS_PACKET_CMD_ACTION]) {
dp->mcgroups[DPIF_UC_ACTION]
= nl_attr_get_u32(mcgroups[OVS_PACKET_CMD_ACTION]);
}
if (mcgroups[OVS_PACKET_CMD_SAMPLE]) {
dp->mcgroups[DPIF_UC_SAMPLE]
= nl_attr_get_u32(mcgroups[OVS_PACKET_CMD_SAMPLE]);
}
}
return 0;
}
/* Appends to 'buf' the Generic Netlink message described by 'dp'. */
static void
dpif_linux_dp_to_ofpbuf(const struct dpif_linux_dp *dp, struct ofpbuf *buf)
{
struct ovs_header *ovs_header;
nl_msg_put_genlmsghdr(buf, 0, ovs_datapath_family,
NLM_F_REQUEST | NLM_F_ECHO, dp->cmd, 1);
ovs_header = ofpbuf_put_uninit(buf, sizeof *ovs_header);
ovs_header->dp_ifindex = dp->dp_ifindex;
if (dp->name) {
nl_msg_put_string(buf, OVS_DP_ATTR_NAME, dp->name);
}
/* Skip OVS_DP_ATTR_STATS since we never have a reason to serialize it. */
if (dp->ipv4_frags) {
nl_msg_put_u32(buf, OVS_DP_ATTR_IPV4_FRAGS, dp->ipv4_frags);
}
if (dp->sampling) {
nl_msg_put_u32(buf, OVS_DP_ATTR_SAMPLING, *dp->sampling);
}
}
/* Clears 'dp' to "empty" values. */
static void
dpif_linux_dp_init(struct dpif_linux_dp *dp)
{
memset(dp, 0, sizeof *dp);
}
static void
dpif_linux_dp_dump_start(struct nl_dump *dump)
{
struct dpif_linux_dp request;
struct ofpbuf *buf;
dpif_linux_dp_init(&request);
request.cmd = OVS_DP_CMD_GET;
buf = ofpbuf_new(1024);
dpif_linux_dp_to_ofpbuf(&request, buf);
nl_dump_start(dump, genl_sock, buf);
ofpbuf_delete(buf);
}
/* 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 of the same form, 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'). */
static int
dpif_linux_dp_transact(const struct dpif_linux_dp *request,
struct dpif_linux_dp *reply, struct ofpbuf **bufp)
{
struct ofpbuf *request_buf;
int error;
assert((reply != NULL) == (bufp != NULL));
request_buf = ofpbuf_new(1024);
dpif_linux_dp_to_ofpbuf(request, request_buf);
error = nl_sock_transact(genl_sock, request_buf, bufp);
ofpbuf_delete(request_buf);
if (reply) {
if (!error) {
error = dpif_linux_dp_from_ofpbuf(reply, *bufp);
}
if (error) {
dpif_linux_dp_init(reply);
ofpbuf_delete(*bufp);
*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'). */
static 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 = OVS_DP_CMD_GET;
request.dp_ifindex = dpif->dp_ifindex;
return dpif_linux_dp_transact(&request, reply, bufp);
}
/* Parses the contents of 'buf', which contains a "struct ovs_header" 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 ovs_flow_policy[] = {
[OVS_FLOW_ATTR_KEY] = { .type = NL_A_NESTED },
[OVS_FLOW_ATTR_ACTIONS] = { .type = NL_A_NESTED, .optional = true },
[OVS_FLOW_ATTR_STATS] = { .type = NL_A_UNSPEC,
.min_len = sizeof(struct ovs_flow_stats),
.max_len = sizeof(struct ovs_flow_stats),
.optional = true },
[OVS_FLOW_ATTR_TCP_FLAGS] = { .type = NL_A_U8, .optional = true },
[OVS_FLOW_ATTR_USED] = { .type = NL_A_U64, .optional = true },
/* The kernel never uses OVS_FLOW_ATTR_CLEAR. */
};
struct nlattr *a[ARRAY_SIZE(ovs_flow_policy)];
struct ovs_header *ovs_header;
struct nlmsghdr *nlmsg;
struct genlmsghdr *genl;
struct ofpbuf b;
dpif_linux_flow_init(flow);
ofpbuf_use_const(&b, buf->data, buf->size);
nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
genl = ofpbuf_try_pull(&b, sizeof *genl);
ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
if (!nlmsg || !genl || !ovs_header
|| nlmsg->nlmsg_type != ovs_flow_family
|| !nl_policy_parse(&b, 0, ovs_flow_policy, a,
ARRAY_SIZE(ovs_flow_policy))) {
return EINVAL;
}
flow->nlmsg_flags = nlmsg->nlmsg_flags;
flow->dp_ifindex = ovs_header->dp_ifindex;
flow->key = nl_attr_get(a[OVS_FLOW_ATTR_KEY]);
flow->key_len = nl_attr_get_size(a[OVS_FLOW_ATTR_KEY]);
if (a[OVS_FLOW_ATTR_ACTIONS]) {
flow->actions = nl_attr_get(a[OVS_FLOW_ATTR_ACTIONS]);
flow->actions_len = nl_attr_get_size(a[OVS_FLOW_ATTR_ACTIONS]);
}
if (a[OVS_FLOW_ATTR_STATS]) {
flow->stats = nl_attr_get(a[OVS_FLOW_ATTR_STATS]);
}
if (a[OVS_FLOW_ATTR_TCP_FLAGS]) {
flow->tcp_flags = nl_attr_get(a[OVS_FLOW_ATTR_TCP_FLAGS]);
}
if (a[OVS_FLOW_ATTR_USED]) {
flow->used = nl_attr_get(a[OVS_FLOW_ATTR_USED]);
}
return 0;
}
/* Appends to 'buf' (which must initially be empty) a "struct ovs_header"
* followed by Netlink attributes corresponding to 'flow'. */
static void
dpif_linux_flow_to_ofpbuf(const struct dpif_linux_flow *flow,
struct ofpbuf *buf)
{
struct ovs_header *ovs_header;
nl_msg_put_genlmsghdr(buf, 0, ovs_flow_family,
NLM_F_REQUEST | NLM_F_ECHO | flow->nlmsg_flags,
flow->cmd, 1);
ovs_header = ofpbuf_put_uninit(buf, sizeof *ovs_header);
ovs_header->dp_ifindex = flow->dp_ifindex;
if (flow->key_len) {
nl_msg_put_unspec(buf, OVS_FLOW_ATTR_KEY, flow->key, flow->key_len);
}
if (flow->actions || flow->actions_len) {
nl_msg_put_unspec(buf, OVS_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, OVS_FLOW_ATTR_CLEAR);
}
}
/* Clears 'flow' to "empty" values. */
static 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 a 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'). */
static int
dpif_linux_flow_transact(const struct dpif_linux_flow *request,
struct dpif_linux_flow *reply, struct ofpbuf **bufp)
{
struct ofpbuf *request_buf;
int error;
assert((reply != NULL) == (bufp != NULL));
request_buf = ofpbuf_new(1024);
dpif_linux_flow_to_ofpbuf(request, request_buf);
error = nl_sock_transact(genl_sock, request_buf, bufp);
ofpbuf_delete(request_buf);
if (reply) {
if (!error) {
error = dpif_linux_flow_from_ofpbuf(reply, *bufp);
}
if (error) {
dpif_linux_flow_init(reply);
ofpbuf_delete(*bufp);
*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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