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ovs/lib/dpif-netlink.c
Terry Wilson ee89ea7b47 json: Move from lib to include/openvswitch. 
To easily allow both in- and out-of-tree building of the Python
wrapper for the OVS JSON parser (e.g. w/ pip), move json.h to
include/openvswitch. This also requires moving lib/{hmap,shash}.h.

Both hmap.h and shash.h were #include-ing "util.h" even though the
headers themselves did not use anything from there, but rather from
include/openvswitch/util.h. Fixing that required including util.h
in several C files mostly due to OVS_NOT_REACHED and things like
xmalloc.

Signed-off-by: Terry Wilson <twilson@redhat.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
2016-07-22 17:09:17 -07:00

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/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 Nicira, Inc.
*
* 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-netlink.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 <poll.h>
#include <stdlib.h>
#include <strings.h>
#include <sys/epoll.h>
#include <sys/stat.h>
#include <unistd.h>
#include "bitmap.h"
#include "dpif-provider.h"
#include "openvswitch/dynamic-string.h"
#include "flow.h"
#include "fat-rwlock.h"
#include "netdev.h"
#include "netdev-linux.h"
#include "netdev-vport.h"
#include "netlink-conntrack.h"
#include "netlink-notifier.h"
#include "netlink-socket.h"
#include "netlink.h"
#include "odp-util.h"
#include "openvswitch/ofpbuf.h"
#include "packets.h"
#include "poll-loop.h"
#include "random.h"
#include "openvswitch/shash.h"
#include "sset.h"
#include "timeval.h"
#include "unaligned.h"
#include "util.h"
#include "openvswitch/vlog.h"
VLOG_DEFINE_THIS_MODULE(dpif_netlink);
#ifdef _WIN32
enum { WINDOWS = 1 };
#else
enum { WINDOWS = 0 };
#endif
enum { MAX_PORTS = USHRT_MAX };
/* 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_netlink_dp {
/* Generic Netlink header. */
uint8_t cmd;
/* struct ovs_header. */
int dp_ifindex;
/* Attributes. */
const char *name; /* OVS_DP_ATTR_NAME. */
const uint32_t *upcall_pid; /* OVS_DP_ATTR_UPCALL_PID. */
uint32_t user_features; /* OVS_DP_ATTR_USER_FEATURES */
const struct ovs_dp_stats *stats; /* OVS_DP_ATTR_STATS. */
const struct ovs_dp_megaflow_stats *megaflow_stats;
/* OVS_DP_ATTR_MEGAFLOW_STATS.*/
};
static void dpif_netlink_dp_init(struct dpif_netlink_dp *);
static int dpif_netlink_dp_from_ofpbuf(struct dpif_netlink_dp *,
const struct ofpbuf *);
static void dpif_netlink_dp_dump_start(struct nl_dump *);
static int dpif_netlink_dp_transact(const struct dpif_netlink_dp *request,
struct dpif_netlink_dp *reply,
struct ofpbuf **bufp);
static int dpif_netlink_dp_get(const struct dpif *,
struct dpif_netlink_dp *reply,
struct ofpbuf **bufp);
struct dpif_netlink_flow {
/* Generic Netlink header. */
uint8_t cmd;
/* struct ovs_header. */
unsigned int nlmsg_flags;
int dp_ifindex;
/* Attributes.
*
* The 'stats' member points to 64-bit data that might only be aligned on
* 32-bit boundaries, so get_unaligned_u64() should be used to access its
* 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 *mask; /* OVS_FLOW_ATTR_MASK. */
size_t mask_len;
const struct nlattr *actions; /* OVS_FLOW_ATTR_ACTIONS. */
size_t actions_len;
ovs_u128 ufid; /* OVS_FLOW_ATTR_FLOW_ID. */
bool ufid_present; /* Is there a UFID? */
bool ufid_terse; /* Skip serializing key/mask/acts? */
const struct ovs_flow_stats *stats; /* OVS_FLOW_ATTR_STATS. */
const uint8_t *tcp_flags; /* OVS_FLOW_ATTR_TCP_FLAGS. */
const ovs_32aligned_u64 *used; /* OVS_FLOW_ATTR_USED. */
bool clear; /* OVS_FLOW_ATTR_CLEAR. */
bool probe; /* OVS_FLOW_ATTR_PROBE. */
};
static void dpif_netlink_flow_init(struct dpif_netlink_flow *);
static int dpif_netlink_flow_from_ofpbuf(struct dpif_netlink_flow *,
const struct ofpbuf *);
static void dpif_netlink_flow_to_ofpbuf(const struct dpif_netlink_flow *,
struct ofpbuf *);
static int dpif_netlink_flow_transact(struct dpif_netlink_flow *request,
struct dpif_netlink_flow *reply,
struct ofpbuf **bufp);
static void dpif_netlink_flow_get_stats(const struct dpif_netlink_flow *,
struct dpif_flow_stats *);
static void dpif_netlink_flow_to_dpif_flow(struct dpif *, struct dpif_flow *,
const struct dpif_netlink_flow *);
/* One of the dpif channels between the kernel and userspace. */
struct dpif_channel {
struct nl_sock *sock; /* Netlink socket. */
long long int last_poll; /* Last time this channel was polled. */
};
#ifdef _WIN32
#define VPORT_SOCK_POOL_SIZE 1
/* On Windows, there is no native support for epoll. There are equivalent
* interfaces though, that are not used currently. For simpicity, a pool of
* netlink sockets is used. Each socket is represented by 'struct
* dpif_windows_vport_sock'. Since it is a pool, multiple OVS ports may be
* sharing the same socket. In the future, we can add a reference count and
* such fields. */
struct dpif_windows_vport_sock {
struct nl_sock *nl_sock; /* netlink socket. */
};
#endif
struct dpif_handler {
struct dpif_channel *channels;/* Array of channels for each handler. */
struct epoll_event *epoll_events;
int epoll_fd; /* epoll fd that includes channel socks. */
int n_events; /* Num events returned by epoll_wait(). */
int event_offset; /* Offset into 'epoll_events'. */
#ifdef _WIN32
/* Pool of sockets. */
struct dpif_windows_vport_sock *vport_sock_pool;
size_t last_used_pool_idx; /* Index to aid in allocating a
socket in the pool to a port. */
#endif
};
/* Datapath interface for the openvswitch Linux kernel module. */
struct dpif_netlink {
struct dpif dpif;
int dp_ifindex;
/* Upcall messages. */
struct fat_rwlock upcall_lock;
struct dpif_handler *handlers;
uint32_t n_handlers; /* Num of upcall handlers. */
int uc_array_size; /* Size of 'handler->channels' and */
/* 'handler->epoll_events'. */
/* Change notification. */
struct nl_sock *port_notifier; /* vport multicast group subscriber. */
bool refresh_channels;
};
static void report_loss(struct dpif_netlink *, struct dpif_channel *,
uint32_t ch_idx, uint32_t handler_id);
static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5);
/* Generic Netlink family numbers for OVS.
*
* Initialized by dpif_netlink_init(). */
static int ovs_datapath_family;
static int ovs_vport_family;
static int ovs_flow_family;
static int ovs_packet_family;
/* Generic Netlink multicast groups for OVS.
*
* Initialized by dpif_netlink_init(). */
static unsigned int ovs_vport_mcgroup;
static int dpif_netlink_init(void);
static int open_dpif(const struct dpif_netlink_dp *, struct dpif **);
static uint32_t dpif_netlink_port_get_pid(const struct dpif *,
odp_port_t port_no, uint32_t hash);
static void dpif_netlink_handler_uninit(struct dpif_handler *handler);
static int dpif_netlink_refresh_channels(struct dpif_netlink *,
uint32_t n_handlers);
static void dpif_netlink_vport_to_ofpbuf(const struct dpif_netlink_vport *,
struct ofpbuf *);
static int dpif_netlink_vport_from_ofpbuf(struct dpif_netlink_vport *,
const struct ofpbuf *);
static struct dpif_netlink *
dpif_netlink_cast(const struct dpif *dpif)
{
dpif_assert_class(dpif, &dpif_netlink_class);
return CONTAINER_OF(dpif, struct dpif_netlink, dpif);
}
static int
dpif_netlink_enumerate(struct sset *all_dps,
const struct dpif_class *dpif_class OVS_UNUSED)
{
struct nl_dump dump;
uint64_t reply_stub[NL_DUMP_BUFSIZE / 8];
struct ofpbuf msg, buf;
int error;
error = dpif_netlink_init();
if (error) {
return error;
}
ofpbuf_use_stub(&buf, reply_stub, sizeof reply_stub);
dpif_netlink_dp_dump_start(&dump);
while (nl_dump_next(&dump, &msg, &buf)) {
struct dpif_netlink_dp dp;
if (!dpif_netlink_dp_from_ofpbuf(&dp, &msg)) {
sset_add(all_dps, dp.name);
}
}
ofpbuf_uninit(&buf);
return nl_dump_done(&dump);
}
static int
dpif_netlink_open(const struct dpif_class *class OVS_UNUSED, const char *name,
bool create, struct dpif **dpifp)
{
struct dpif_netlink_dp dp_request, dp;
struct ofpbuf *buf;
uint32_t upcall_pid;
int error;
error = dpif_netlink_init();
if (error) {
return error;
}
/* Create or look up datapath. */
dpif_netlink_dp_init(&dp_request);
if (create) {
dp_request.cmd = OVS_DP_CMD_NEW;
upcall_pid = 0;
dp_request.upcall_pid = &upcall_pid;
} else {
/* Use OVS_DP_CMD_SET to report user features */
dp_request.cmd = OVS_DP_CMD_SET;
}
dp_request.name = name;
dp_request.user_features |= OVS_DP_F_UNALIGNED;
dp_request.user_features |= OVS_DP_F_VPORT_PIDS;
error = dpif_netlink_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_netlink_dp *dp, struct dpif **dpifp)
{
struct dpif_netlink *dpif;
dpif = xzalloc(sizeof *dpif);
dpif->port_notifier = NULL;
fat_rwlock_init(&dpif->upcall_lock);
dpif_init(&dpif->dpif, &dpif_netlink_class, dp->name,
dp->dp_ifindex, dp->dp_ifindex);
dpif->dp_ifindex = dp->dp_ifindex;
*dpifp = &dpif->dpif;
return 0;
}
/* Destroys the netlink sockets pointed by the elements in 'socksp'
* and frees the 'socksp'. */
static void
vport_del_socksp__(struct nl_sock **socksp, uint32_t n_socks)
{
size_t i;
for (i = 0; i < n_socks; i++) {
nl_sock_destroy(socksp[i]);
}
free(socksp);
}
/* Creates an array of netlink sockets. Returns an array of the
* corresponding pointers. Records the error in 'error'. */
static struct nl_sock **
vport_create_socksp__(uint32_t n_socks, int *error)
{
struct nl_sock **socksp = xzalloc(n_socks * sizeof *socksp);
size_t i;
for (i = 0; i < n_socks; i++) {
*error = nl_sock_create(NETLINK_GENERIC, &socksp[i]);
if (*error) {
goto error;
}
}
return socksp;
error:
vport_del_socksp__(socksp, n_socks);
return NULL;
}
#ifdef _WIN32
static void
vport_delete_sock_pool(struct dpif_handler *handler)
OVS_REQ_WRLOCK(dpif->upcall_lock)
{
if (handler->vport_sock_pool) {
uint32_t i;
struct dpif_windows_vport_sock *sock_pool =
handler->vport_sock_pool;
for (i = 0; i < VPORT_SOCK_POOL_SIZE; i++) {
if (sock_pool[i].nl_sock) {
nl_sock_unsubscribe_packets(sock_pool[i].nl_sock);
nl_sock_destroy(sock_pool[i].nl_sock);
sock_pool[i].nl_sock = NULL;
}
}
free(handler->vport_sock_pool);
handler->vport_sock_pool = NULL;
}
}
static int
vport_create_sock_pool(struct dpif_handler *handler)
OVS_REQ_WRLOCK(dpif->upcall_lock)
{
struct dpif_windows_vport_sock *sock_pool;
size_t i;
int error = 0;
sock_pool = xzalloc(VPORT_SOCK_POOL_SIZE * sizeof *sock_pool);
for (i = 0; i < VPORT_SOCK_POOL_SIZE; i++) {
error = nl_sock_create(NETLINK_GENERIC, &sock_pool[i].nl_sock);
if (error) {
goto error;
}
/* Enable the netlink socket to receive packets. This is equivalent to
* calling nl_sock_join_mcgroup() to receive events. */
error = nl_sock_subscribe_packets(sock_pool[i].nl_sock);
if (error) {
goto error;
}
}
handler->vport_sock_pool = sock_pool;
handler->last_used_pool_idx = 0;
return 0;
error:
vport_delete_sock_pool(handler);
return error;
}
/* Returns an array pointers to netlink sockets. The sockets are picked from a
* pool. Records the error in 'error'. */
static struct nl_sock **
vport_create_socksp_windows(struct dpif_netlink *dpif, int *error)
OVS_REQ_WRLOCK(dpif->upcall_lock)
{
uint32_t n_socks = dpif->n_handlers;
struct nl_sock **socksp;
size_t i;
ovs_assert(n_socks <= 1);
socksp = xzalloc(n_socks * sizeof *socksp);
/* Pick netlink sockets to use in a round-robin fashion from each
* handler's pool of sockets. */
for (i = 0; i < n_socks; i++) {
struct dpif_handler *handler = &dpif->handlers[i];
struct dpif_windows_vport_sock *sock_pool = handler->vport_sock_pool;
size_t index = handler->last_used_pool_idx;
/* A pool of sockets is allocated when the handler is initialized. */
if (sock_pool == NULL) {
free(socksp);
*error = EINVAL;
return NULL;
}
ovs_assert(index < VPORT_SOCK_POOL_SIZE);
socksp[i] = sock_pool[index].nl_sock;
socksp[i] = sock_pool[index].nl_sock;
ovs_assert(socksp[i]);
index = (index == VPORT_SOCK_POOL_SIZE - 1) ? 0 : index + 1;
handler->last_used_pool_idx = index;
}
return socksp;
}
static void
vport_del_socksp_windows(struct dpif_netlink *dpif, struct nl_sock **socksp)
{
free(socksp);
}
#endif /* _WIN32 */
static struct nl_sock **
vport_create_socksp(struct dpif_netlink *dpif, int *error)
{
#ifdef _WIN32
return vport_create_socksp_windows(dpif, error);
#else
return vport_create_socksp__(dpif->n_handlers, error);
#endif
}
static void
vport_del_socksp(struct dpif_netlink *dpif, struct nl_sock **socksp)
{
#ifdef _WIN32
vport_del_socksp_windows(dpif, socksp);
#else
vport_del_socksp__(socksp, dpif->n_handlers);
#endif
}
/* Given the array of pointers to netlink sockets 'socksp', returns
* the array of corresponding pids. If the 'socksp' is NULL, returns
* a single-element array of value 0. */
static uint32_t *
vport_socksp_to_pids(struct nl_sock **socksp, uint32_t n_socks)
{
uint32_t *pids;
if (!socksp) {
pids = xzalloc(sizeof *pids);
} else {
size_t i;
pids = xzalloc(n_socks * sizeof *pids);
for (i = 0; i < n_socks; i++) {
pids[i] = nl_sock_pid(socksp[i]);
}
}
return pids;
}
/* Given the port number 'port_idx', extracts the pids of netlink sockets
* associated to the port and assigns it to 'upcall_pids'. */
static bool
vport_get_pids(struct dpif_netlink *dpif, uint32_t port_idx,
uint32_t **upcall_pids)
{
uint32_t *pids;
size_t i;
/* Since the nl_sock can only be assigned in either all
* or none "dpif->handlers" channels, the following check
* would suffice. */
if (!dpif->handlers[0].channels[port_idx].sock) {
return false;
}
ovs_assert(!WINDOWS || dpif->n_handlers <= 1);
pids = xzalloc(dpif->n_handlers * sizeof *pids);
for (i = 0; i < dpif->n_handlers; i++) {
pids[i] = nl_sock_pid(dpif->handlers[i].channels[port_idx].sock);
}
*upcall_pids = pids;
return true;
}
static int
vport_add_channels(struct dpif_netlink *dpif, odp_port_t port_no,
struct nl_sock **socksp)
{
struct epoll_event event;
uint32_t port_idx = odp_to_u32(port_no);
size_t i, j;
int error;
if (dpif->handlers == NULL) {
return 0;
}
/* We assume that the datapath densely chooses port numbers, which can
* therefore be used as an index into 'channels' and 'epoll_events' of
* 'dpif->handler'. */
if (port_idx >= dpif->uc_array_size) {
uint32_t new_size = port_idx + 1;
if (new_size > MAX_PORTS) {
VLOG_WARN_RL(&error_rl, "%s: datapath port %"PRIu32" too big",
dpif_name(&dpif->dpif), port_no);
return EFBIG;
}
for (i = 0; i < dpif->n_handlers; i++) {
struct dpif_handler *handler = &dpif->handlers[i];
handler->channels = xrealloc(handler->channels,
new_size * sizeof *handler->channels);
for (j = dpif->uc_array_size; j < new_size; j++) {
handler->channels[j].sock = NULL;
}
handler->epoll_events = xrealloc(handler->epoll_events,
new_size * sizeof *handler->epoll_events);
}
dpif->uc_array_size = new_size;
}
memset(&event, 0, sizeof event);
event.events = EPOLLIN;
event.data.u32 = port_idx;
for (i = 0; i < dpif->n_handlers; i++) {
struct dpif_handler *handler = &dpif->handlers[i];
#ifndef _WIN32
if (epoll_ctl(handler->epoll_fd, EPOLL_CTL_ADD, nl_sock_fd(socksp[i]),
&event) < 0) {
error = errno;
goto error;
}
#endif
dpif->handlers[i].channels[port_idx].sock = socksp[i];
dpif->handlers[i].channels[port_idx].last_poll = LLONG_MIN;
}
return 0;
error:
for (j = 0; j < i; j++) {
#ifndef _WIN32
epoll_ctl(dpif->handlers[j].epoll_fd, EPOLL_CTL_DEL,
nl_sock_fd(socksp[j]), NULL);
#endif
dpif->handlers[j].channels[port_idx].sock = NULL;
}
return error;
}
static void
vport_del_channels(struct dpif_netlink *dpif, odp_port_t port_no)
{
uint32_t port_idx = odp_to_u32(port_no);
size_t i;
if (!dpif->handlers || port_idx >= dpif->uc_array_size) {
return;
}
/* Since the sock can only be assigned in either all or none
* of "dpif->handlers" channels, the following check would
* suffice. */
if (!dpif->handlers[0].channels[port_idx].sock) {
return;
}
for (i = 0; i < dpif->n_handlers; i++) {
struct dpif_handler *handler = &dpif->handlers[i];
#ifndef _WIN32
epoll_ctl(handler->epoll_fd, EPOLL_CTL_DEL,
nl_sock_fd(handler->channels[port_idx].sock), NULL);
nl_sock_destroy(handler->channels[port_idx].sock);
#endif
handler->channels[port_idx].sock = NULL;
handler->event_offset = handler->n_events = 0;
}
}
static void
destroy_all_channels(struct dpif_netlink *dpif)
OVS_REQ_WRLOCK(dpif->upcall_lock)
{
unsigned int i;
if (!dpif->handlers) {
return;
}
for (i = 0; i < dpif->uc_array_size; i++ ) {
struct dpif_netlink_vport vport_request;
uint32_t upcall_pids = 0;
/* Since the sock can only be assigned in either all or none
* of "dpif->handlers" channels, the following check would
* suffice. */
if (!dpif->handlers[0].channels[i].sock) {
continue;
}
/* Turn off upcalls. */
dpif_netlink_vport_init(&vport_request);
vport_request.cmd = OVS_VPORT_CMD_SET;
vport_request.dp_ifindex = dpif->dp_ifindex;
vport_request.port_no = u32_to_odp(i);
vport_request.n_upcall_pids = 1;
vport_request.upcall_pids = &upcall_pids;
dpif_netlink_vport_transact(&vport_request, NULL, NULL);
vport_del_channels(dpif, u32_to_odp(i));
}
for (i = 0; i < dpif->n_handlers; i++) {
struct dpif_handler *handler = &dpif->handlers[i];
dpif_netlink_handler_uninit(handler);
free(handler->epoll_events);
free(handler->channels);
}
free(dpif->handlers);
dpif->handlers = NULL;
dpif->n_handlers = 0;
dpif->uc_array_size = 0;
}
static void
dpif_netlink_close(struct dpif *dpif_)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
nl_sock_destroy(dpif->port_notifier);
fat_rwlock_wrlock(&dpif->upcall_lock);
destroy_all_channels(dpif);
fat_rwlock_unlock(&dpif->upcall_lock);
fat_rwlock_destroy(&dpif->upcall_lock);
free(dpif);
}
static int
dpif_netlink_destroy(struct dpif *dpif_)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
struct dpif_netlink_dp dp;
dpif_netlink_dp_init(&dp);
dp.cmd = OVS_DP_CMD_DEL;
dp.dp_ifindex = dpif->dp_ifindex;
return dpif_netlink_dp_transact(&dp, NULL, NULL);
}
static bool
dpif_netlink_run(struct dpif *dpif_)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
if (dpif->refresh_channels) {
dpif->refresh_channels = false;
fat_rwlock_wrlock(&dpif->upcall_lock);
dpif_netlink_refresh_channels(dpif, dpif->n_handlers);
fat_rwlock_unlock(&dpif->upcall_lock);
}
return false;
}
static int
dpif_netlink_get_stats(const struct dpif *dpif_, struct dpif_dp_stats *stats)
{
struct dpif_netlink_dp dp;
struct ofpbuf *buf;
int error;
error = dpif_netlink_dp_get(dpif_, &dp, &buf);
if (!error) {
memset(stats, 0, sizeof *stats);
if (dp.stats) {
stats->n_hit = get_32aligned_u64(&dp.stats->n_hit);
stats->n_missed = get_32aligned_u64(&dp.stats->n_missed);
stats->n_lost = get_32aligned_u64(&dp.stats->n_lost);
stats->n_flows = get_32aligned_u64(&dp.stats->n_flows);
}
if (dp.megaflow_stats) {
stats->n_masks = dp.megaflow_stats->n_masks;
stats->n_mask_hit = get_32aligned_u64(
&dp.megaflow_stats->n_mask_hit);
} else {
stats->n_masks = UINT32_MAX;
stats->n_mask_hit = UINT64_MAX;
}
ofpbuf_delete(buf);
}
return error;
}
static const char *
get_vport_type(const struct dpif_netlink_vport *vport)
{
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
switch (vport->type) {
case OVS_VPORT_TYPE_NETDEV: {
const char *type = netdev_get_type_from_name(vport->name);
return type ? type : "system";
}
case OVS_VPORT_TYPE_INTERNAL:
return "internal";
case OVS_VPORT_TYPE_GENEVE:
return "geneve";
case OVS_VPORT_TYPE_GRE:
return "gre";
case OVS_VPORT_TYPE_VXLAN:
return "vxlan";
case OVS_VPORT_TYPE_LISP:
return "lisp";
case OVS_VPORT_TYPE_STT:
return "stt";
case OVS_VPORT_TYPE_UNSPEC:
case __OVS_VPORT_TYPE_MAX:
break;
}
VLOG_WARN_RL(&rl, "dp%d: port `%s' has unsupported type %u",
vport->dp_ifindex, vport->name, (unsigned int) vport->type);
return "unknown";
}
static enum ovs_vport_type
netdev_to_ovs_vport_type(const struct netdev *netdev)
{
const char *type = netdev_get_type(netdev);
if (!strcmp(type, "tap") || !strcmp(type, "system")) {
return OVS_VPORT_TYPE_NETDEV;
} else if (!strcmp(type, "internal")) {
return OVS_VPORT_TYPE_INTERNAL;
} else if (strstr(type, "stt")) {
return OVS_VPORT_TYPE_STT;
} else if (!strcmp(type, "geneve")) {
return OVS_VPORT_TYPE_GENEVE;
} else if (strstr(type, "gre")) {
return OVS_VPORT_TYPE_GRE;
} else if (!strcmp(type, "vxlan")) {
return OVS_VPORT_TYPE_VXLAN;
} else if (!strcmp(type, "lisp")) {
return OVS_VPORT_TYPE_LISP;
} else {
return OVS_VPORT_TYPE_UNSPEC;
}
}
static int
dpif_netlink_port_add__(struct dpif_netlink *dpif, struct netdev *netdev,
odp_port_t *port_nop)
OVS_REQ_WRLOCK(dpif->upcall_lock)
{
const struct netdev_tunnel_config *tnl_cfg;
char namebuf[NETDEV_VPORT_NAME_BUFSIZE];
const char *name = netdev_vport_get_dpif_port(netdev,
namebuf, sizeof namebuf);
const char *type = netdev_get_type(netdev);
struct dpif_netlink_vport request, reply;
struct ofpbuf *buf;
uint64_t options_stub[64 / 8];
struct ofpbuf options;
struct nl_sock **socksp = NULL;
uint32_t *upcall_pids;
int error = 0;
if (dpif->handlers) {
socksp = vport_create_socksp(dpif, &error);
if (!socksp) {
return error;
}
}
dpif_netlink_vport_init(&request);
request.cmd = OVS_VPORT_CMD_NEW;
request.dp_ifindex = dpif->dp_ifindex;
request.type = netdev_to_ovs_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->dpif), name, type);
vport_del_socksp(dpif, socksp);
return EINVAL;
}
request.name = name;
if (request.type == OVS_VPORT_TYPE_NETDEV) {
#ifdef _WIN32
/* XXX : Map appropiate Windows handle */
#else
netdev_linux_ethtool_set_flag(netdev, ETH_FLAG_LRO, "LRO", false);
#endif
}
tnl_cfg = netdev_get_tunnel_config(netdev);
if (tnl_cfg && (tnl_cfg->dst_port != 0 || tnl_cfg->exts)) {
ofpbuf_use_stack(&options, options_stub, sizeof options_stub);
if (tnl_cfg->dst_port) {
nl_msg_put_u16(&options, OVS_TUNNEL_ATTR_DST_PORT,
ntohs(tnl_cfg->dst_port));
}
if (tnl_cfg->exts) {
size_t ext_ofs;
int i;
ext_ofs = nl_msg_start_nested(&options, OVS_TUNNEL_ATTR_EXTENSION);
for (i = 0; i < 32; i++) {
if (tnl_cfg->exts & (1 << i)) {
nl_msg_put_flag(&options, i);
}
}
nl_msg_end_nested(&options, ext_ofs);
}
request.options = options.data;
request.options_len = options.size;
}
request.port_no = *port_nop;
upcall_pids = vport_socksp_to_pids(socksp, dpif->n_handlers);
request.n_upcall_pids = socksp ? dpif->n_handlers : 1;
request.upcall_pids = upcall_pids;
error = dpif_netlink_vport_transact(&request, &reply, &buf);
if (!error) {
*port_nop = reply.port_no;
} else {
if (error == EBUSY && *port_nop != ODPP_NONE) {
VLOG_INFO("%s: requested port %"PRIu32" is in use",
dpif_name(&dpif->dpif), *port_nop);
}
vport_del_socksp(dpif, socksp);
goto exit;
}
if (socksp) {
error = vport_add_channels(dpif, *port_nop, socksp);
if (error) {
VLOG_INFO("%s: could not add channel for port %s",
dpif_name(&dpif->dpif), name);
/* Delete the port. */
dpif_netlink_vport_init(&request);
request.cmd = OVS_VPORT_CMD_DEL;
request.dp_ifindex = dpif->dp_ifindex;
request.port_no = *port_nop;
dpif_netlink_vport_transact(&request, NULL, NULL);
vport_del_socksp(dpif, socksp);
goto exit;
}
}
free(socksp);
exit:
ofpbuf_delete(buf);
free(upcall_pids);
return error;
}
static int
dpif_netlink_port_add(struct dpif *dpif_, struct netdev *netdev,
odp_port_t *port_nop)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
int error;
fat_rwlock_wrlock(&dpif->upcall_lock);
error = dpif_netlink_port_add__(dpif, netdev, port_nop);
fat_rwlock_unlock(&dpif->upcall_lock);
return error;
}
static int
dpif_netlink_port_del__(struct dpif_netlink *dpif, odp_port_t port_no)
OVS_REQ_WRLOCK(dpif->upcall_lock)
{
struct dpif_netlink_vport vport;
int error;
dpif_netlink_vport_init(&vport);
vport.cmd = OVS_VPORT_CMD_DEL;
vport.dp_ifindex = dpif->dp_ifindex;
vport.port_no = port_no;
error = dpif_netlink_vport_transact(&vport, NULL, NULL);
vport_del_channels(dpif, port_no);
return error;
}
static int
dpif_netlink_port_del(struct dpif *dpif_, odp_port_t port_no)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
int error;
fat_rwlock_wrlock(&dpif->upcall_lock);
error = dpif_netlink_port_del__(dpif, port_no);
fat_rwlock_unlock(&dpif->upcall_lock);
return error;
}
static int
dpif_netlink_port_query__(const struct dpif_netlink *dpif, odp_port_t port_no,
const char *port_name, struct dpif_port *dpif_port)
{
struct dpif_netlink_vport request;
struct dpif_netlink_vport reply;
struct ofpbuf *buf;
int error;
dpif_netlink_vport_init(&request);
request.cmd = OVS_VPORT_CMD_GET;
request.dp_ifindex = dpif->dp_ifindex;
request.port_no = port_no;
request.name = port_name;
error = dpif_netlink_vport_transact(&request, &reply, &buf);
if (!error) {
if (reply.dp_ifindex != request.dp_ifindex) {
/* A query by name reported that 'port_name' is in some datapath
* other than 'dpif', but the caller wants to know about 'dpif'. */
error = ENODEV;
} else if (dpif_port) {
dpif_port->name = xstrdup(reply.name);
dpif_port->type = xstrdup(get_vport_type(&reply));
dpif_port->port_no = reply.port_no;
}
ofpbuf_delete(buf);
}
return error;
}
static int
dpif_netlink_port_query_by_number(const struct dpif *dpif_, odp_port_t port_no,
struct dpif_port *dpif_port)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
return dpif_netlink_port_query__(dpif, port_no, NULL, dpif_port);
}
static int
dpif_netlink_port_query_by_name(const struct dpif *dpif_, const char *devname,
struct dpif_port *dpif_port)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
return dpif_netlink_port_query__(dpif, 0, devname, dpif_port);
}
static uint32_t
dpif_netlink_port_get_pid__(const struct dpif_netlink *dpif,
odp_port_t port_no, uint32_t hash)
OVS_REQ_RDLOCK(dpif->upcall_lock)
{
uint32_t port_idx = odp_to_u32(port_no);
uint32_t pid = 0;
if (dpif->handlers && dpif->uc_array_size > 0) {
/* The ODPP_NONE "reserved" port number uses the "ovs-system"'s
* channel, since it is not heavily loaded. */
uint32_t idx = port_idx >= dpif->uc_array_size ? 0 : port_idx;
struct dpif_handler *h = &dpif->handlers[hash % dpif->n_handlers];
/* Needs to check in case the socket pointer is changed in between
* the holding of upcall_lock. A known case happens when the main
* thread deletes the vport while the handler thread is handling
* the upcall from that port. */
if (h->channels[idx].sock) {
pid = nl_sock_pid(h->channels[idx].sock);
}
}
return pid;
}
static uint32_t
dpif_netlink_port_get_pid(const struct dpif *dpif_, odp_port_t port_no,
uint32_t hash)
{
const struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
uint32_t ret;
fat_rwlock_rdlock(&dpif->upcall_lock);
ret = dpif_netlink_port_get_pid__(dpif, port_no, hash);
fat_rwlock_unlock(&dpif->upcall_lock);
return ret;
}
static int
dpif_netlink_flow_flush(struct dpif *dpif_)
{
const struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
struct dpif_netlink_flow flow;
dpif_netlink_flow_init(&flow);
flow.cmd = OVS_FLOW_CMD_DEL;
flow.dp_ifindex = dpif->dp_ifindex;
return dpif_netlink_flow_transact(&flow, NULL, NULL);
}
struct dpif_netlink_port_state {
struct nl_dump dump;
struct ofpbuf buf;
};
static void
dpif_netlink_port_dump_start__(const struct dpif_netlink *dpif,
struct nl_dump *dump)
{
struct dpif_netlink_vport request;
struct ofpbuf *buf;
dpif_netlink_vport_init(&request);
request.cmd = OVS_VPORT_CMD_GET;
request.dp_ifindex = dpif->dp_ifindex;
buf = ofpbuf_new(1024);
dpif_netlink_vport_to_ofpbuf(&request, buf);
nl_dump_start(dump, NETLINK_GENERIC, buf);
ofpbuf_delete(buf);
}
static int
dpif_netlink_port_dump_start(const struct dpif *dpif_, void **statep)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
struct dpif_netlink_port_state *state;
*statep = state = xmalloc(sizeof *state);
dpif_netlink_port_dump_start__(dpif, &state->dump);
ofpbuf_init(&state->buf, NL_DUMP_BUFSIZE);
return 0;
}
static int
dpif_netlink_port_dump_next__(const struct dpif_netlink *dpif,
struct nl_dump *dump,
struct dpif_netlink_vport *vport,
struct ofpbuf *buffer)
{
struct ofpbuf buf;
int error;
if (!nl_dump_next(dump, &buf, buffer)) {
return EOF;
}
error = dpif_netlink_vport_from_ofpbuf(vport, &buf);
if (error) {
VLOG_WARN_RL(&error_rl, "%s: failed to parse vport record (%s)",
dpif_name(&dpif->dpif), ovs_strerror(error));
}
return error;
}
static int
dpif_netlink_port_dump_next(const struct dpif *dpif_, void *state_,
struct dpif_port *dpif_port)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
struct dpif_netlink_port_state *state = state_;
struct dpif_netlink_vport vport;
int error;
error = dpif_netlink_port_dump_next__(dpif, &state->dump, &vport,
&state->buf);
if (error) {
return error;
}
dpif_port->name = CONST_CAST(char *, vport.name);
dpif_port->type = CONST_CAST(char *, get_vport_type(&vport));
dpif_port->port_no = vport.port_no;
return 0;
}
static int
dpif_netlink_port_dump_done(const struct dpif *dpif_ OVS_UNUSED, void *state_)
{
struct dpif_netlink_port_state *state = state_;
int error = nl_dump_done(&state->dump);
ofpbuf_uninit(&state->buf);
free(state);
return error;
}
static int
dpif_netlink_port_poll(const struct dpif *dpif_, char **devnamep)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
/* Lazily create the Netlink socket to listen for notifications. */
if (!dpif->port_notifier) {
struct nl_sock *sock;
int error;
error = nl_sock_create(NETLINK_GENERIC, &sock);
if (error) {
return error;
}
error = nl_sock_join_mcgroup(sock, ovs_vport_mcgroup);
if (error) {
nl_sock_destroy(sock);
return error;
}
dpif->port_notifier = sock;
/* We have no idea of the current state so report that everything
* changed. */
return ENOBUFS;
}
for (;;) {
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
uint64_t buf_stub[4096 / 8];
struct ofpbuf buf;
int error;
ofpbuf_use_stub(&buf, buf_stub, sizeof buf_stub);
error = nl_sock_recv(dpif->port_notifier, &buf, false);
if (!error) {
struct dpif_netlink_vport vport;
error = dpif_netlink_vport_from_ofpbuf(&vport, &buf);
if (!error) {
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);
if (vport.cmd == OVS_VPORT_CMD_DEL && dpif->handlers) {
dpif->refresh_channels = true;
}
*devnamep = xstrdup(vport.name);
ofpbuf_uninit(&buf);
return 0;
}
}
} else if (error != EAGAIN) {
VLOG_WARN_RL(&rl, "error reading or parsing netlink (%s)",
ovs_strerror(error));
nl_sock_drain(dpif->port_notifier);
error = ENOBUFS;
}
ofpbuf_uninit(&buf);
if (error) {
return error;
}
}
}
static void
dpif_netlink_port_poll_wait(const struct dpif *dpif_)
{
const struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
if (dpif->port_notifier) {
nl_sock_wait(dpif->port_notifier, POLLIN);
} else {
poll_immediate_wake();
}
}
static void
dpif_netlink_flow_init_ufid(struct dpif_netlink_flow *request,
const ovs_u128 *ufid, bool terse)
{
if (ufid) {
request->ufid = *ufid;
request->ufid_present = true;
} else {
request->ufid_present = false;
}
request->ufid_terse = terse;
}
static void
dpif_netlink_init_flow_get__(const struct dpif_netlink *dpif,
const struct nlattr *key, size_t key_len,
const ovs_u128 *ufid, bool terse,
struct dpif_netlink_flow *request)
{
dpif_netlink_flow_init(request);
request->cmd = OVS_FLOW_CMD_GET;
request->dp_ifindex = dpif->dp_ifindex;
request->key = key;
request->key_len = key_len;
dpif_netlink_flow_init_ufid(request, ufid, terse);
}
static void
dpif_netlink_init_flow_get(const struct dpif_netlink *dpif,
const struct dpif_flow_get *get,
struct dpif_netlink_flow *request)
{
dpif_netlink_init_flow_get__(dpif, get->key, get->key_len, get->ufid,
false, request);
}
static int
dpif_netlink_flow_get__(const struct dpif_netlink *dpif,
const struct nlattr *key, size_t key_len,
const ovs_u128 *ufid, bool terse,
struct dpif_netlink_flow *reply, struct ofpbuf **bufp)
{
struct dpif_netlink_flow request;
dpif_netlink_init_flow_get__(dpif, key, key_len, ufid, terse, &request);
return dpif_netlink_flow_transact(&request, reply, bufp);
}
static int
dpif_netlink_flow_get(const struct dpif_netlink *dpif,
const struct dpif_netlink_flow *flow,
struct dpif_netlink_flow *reply, struct ofpbuf **bufp)
{
return dpif_netlink_flow_get__(dpif, flow->key, flow->key_len,
flow->ufid_present ? &flow->ufid : NULL,
false, reply, bufp);
}
static void
dpif_netlink_init_flow_put(struct dpif_netlink *dpif,
const struct dpif_flow_put *put,
struct dpif_netlink_flow *request)
{
static const struct nlattr dummy_action;
dpif_netlink_flow_init(request);
request->cmd = (put->flags & DPIF_FP_CREATE
? OVS_FLOW_CMD_NEW : OVS_FLOW_CMD_SET);
request->dp_ifindex = dpif->dp_ifindex;
request->key = put->key;
request->key_len = put->key_len;
request->mask = put->mask;
request->mask_len = put->mask_len;
dpif_netlink_flow_init_ufid(request, put->ufid, false);
/* Ensure that OVS_FLOW_ATTR_ACTIONS will always be included. */
request->actions = (put->actions
? put->actions
: CONST_CAST(struct nlattr *, &dummy_action));
request->actions_len = put->actions_len;
if (put->flags & DPIF_FP_ZERO_STATS) {
request->clear = true;
}
if (put->flags & DPIF_FP_PROBE) {
request->probe = true;
}
request->nlmsg_flags = put->flags & DPIF_FP_MODIFY ? 0 : NLM_F_CREATE;
}
static void
dpif_netlink_init_flow_del__(struct dpif_netlink *dpif,
const struct nlattr *key, size_t key_len,
const ovs_u128 *ufid, bool terse,
struct dpif_netlink_flow *request)
{
dpif_netlink_flow_init(request);
request->cmd = OVS_FLOW_CMD_DEL;
request->dp_ifindex = dpif->dp_ifindex;
request->key = key;
request->key_len = key_len;
dpif_netlink_flow_init_ufid(request, ufid, terse);
}
static void
dpif_netlink_init_flow_del(struct dpif_netlink *dpif,
const struct dpif_flow_del *del,
struct dpif_netlink_flow *request)
{
dpif_netlink_init_flow_del__(dpif, del->key, del->key_len,
del->ufid, del->terse, request);
}
struct dpif_netlink_flow_dump {
struct dpif_flow_dump up;
struct nl_dump nl_dump;
atomic_int status;
};
static struct dpif_netlink_flow_dump *
dpif_netlink_flow_dump_cast(struct dpif_flow_dump *dump)
{
return CONTAINER_OF(dump, struct dpif_netlink_flow_dump, up);
}
static struct dpif_flow_dump *
dpif_netlink_flow_dump_create(const struct dpif *dpif_, bool terse)
{
const struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
struct dpif_netlink_flow_dump *dump;
struct dpif_netlink_flow request;
struct ofpbuf *buf;
dump = xmalloc(sizeof *dump);
dpif_flow_dump_init(&dump->up, dpif_);
dpif_netlink_flow_init(&request);
request.cmd = OVS_FLOW_CMD_GET;
request.dp_ifindex = dpif->dp_ifindex;
request.ufid_present = false;
request.ufid_terse = terse;
buf = ofpbuf_new(1024);
dpif_netlink_flow_to_ofpbuf(&request, buf);
nl_dump_start(&dump->nl_dump, NETLINK_GENERIC, buf);
ofpbuf_delete(buf);
atomic_init(&dump->status, 0);
dump->up.terse = terse;
return &dump->up;
}
static int
dpif_netlink_flow_dump_destroy(struct dpif_flow_dump *dump_)
{
struct dpif_netlink_flow_dump *dump = dpif_netlink_flow_dump_cast(dump_);
unsigned int nl_status = nl_dump_done(&dump->nl_dump);
int dump_status;
/* No other thread has access to 'dump' at this point. */
atomic_read_relaxed(&dump->status, &dump_status);
free(dump);
return dump_status ? dump_status : nl_status;
}
struct dpif_netlink_flow_dump_thread {
struct dpif_flow_dump_thread up;
struct dpif_netlink_flow_dump *dump;
struct dpif_netlink_flow flow;
struct dpif_flow_stats stats;
struct ofpbuf nl_flows; /* Always used to store flows. */
struct ofpbuf *nl_actions; /* Used if kernel does not supply actions. */
};
static struct dpif_netlink_flow_dump_thread *
dpif_netlink_flow_dump_thread_cast(struct dpif_flow_dump_thread *thread)
{
return CONTAINER_OF(thread, struct dpif_netlink_flow_dump_thread, up);
}
static struct dpif_flow_dump_thread *
dpif_netlink_flow_dump_thread_create(struct dpif_flow_dump *dump_)
{
struct dpif_netlink_flow_dump *dump = dpif_netlink_flow_dump_cast(dump_);
struct dpif_netlink_flow_dump_thread *thread;
thread = xmalloc(sizeof *thread);
dpif_flow_dump_thread_init(&thread->up, &dump->up);
thread->dump = dump;
ofpbuf_init(&thread->nl_flows, NL_DUMP_BUFSIZE);
thread->nl_actions = NULL;
return &thread->up;
}
static void
dpif_netlink_flow_dump_thread_destroy(struct dpif_flow_dump_thread *thread_)
{
struct dpif_netlink_flow_dump_thread *thread
= dpif_netlink_flow_dump_thread_cast(thread_);
ofpbuf_uninit(&thread->nl_flows);
ofpbuf_delete(thread->nl_actions);
free(thread);
}
static void
dpif_netlink_flow_to_dpif_flow(struct dpif *dpif, struct dpif_flow *dpif_flow,
const struct dpif_netlink_flow *datapath_flow)
{
dpif_flow->key = datapath_flow->key;
dpif_flow->key_len = datapath_flow->key_len;
dpif_flow->mask = datapath_flow->mask;
dpif_flow->mask_len = datapath_flow->mask_len;
dpif_flow->actions = datapath_flow->actions;
dpif_flow->actions_len = datapath_flow->actions_len;
dpif_flow->ufid_present = datapath_flow->ufid_present;
dpif_flow->pmd_id = PMD_ID_NULL;
if (datapath_flow->ufid_present) {
dpif_flow->ufid = datapath_flow->ufid;
} else {
ovs_assert(datapath_flow->key && datapath_flow->key_len);
dpif_flow_hash(dpif, datapath_flow->key, datapath_flow->key_len,
&dpif_flow->ufid);
}
dpif_netlink_flow_get_stats(datapath_flow, &dpif_flow->stats);
}
static int
dpif_netlink_flow_dump_next(struct dpif_flow_dump_thread *thread_,
struct dpif_flow *flows, int max_flows)
{
struct dpif_netlink_flow_dump_thread *thread
= dpif_netlink_flow_dump_thread_cast(thread_);
struct dpif_netlink_flow_dump *dump = thread->dump;
struct dpif_netlink *dpif = dpif_netlink_cast(thread->up.dpif);
int n_flows;
ofpbuf_delete(thread->nl_actions);
thread->nl_actions = NULL;
n_flows = 0;
while (!n_flows
|| (n_flows < max_flows && thread->nl_flows.size)) {
struct dpif_netlink_flow datapath_flow;
struct ofpbuf nl_flow;
int error;
/* Try to grab another flow. */
if (!nl_dump_next(&dump->nl_dump, &nl_flow, &thread->nl_flows)) {
break;
}
/* Convert the flow to our output format. */
error = dpif_netlink_flow_from_ofpbuf(&datapath_flow, &nl_flow);
if (error) {
atomic_store_relaxed(&dump->status, error);
break;
}
if (dump->up.terse || datapath_flow.actions) {
/* Common case: we don't want actions, or the flow includes
* actions. */
dpif_netlink_flow_to_dpif_flow(&dpif->dpif, &flows[n_flows++],
&datapath_flow);
} else {
/* Rare case: the flow does not include actions. Retrieve this
* individual flow again to get the actions. */
error = dpif_netlink_flow_get(dpif, &datapath_flow,
&datapath_flow, &thread->nl_actions);
if (error == ENOENT) {
VLOG_DBG("dumped flow disappeared on get");
continue;
} else if (error) {
VLOG_WARN("error fetching dumped flow: %s",
ovs_strerror(error));
atomic_store_relaxed(&dump->status, error);
break;
}
/* Save this flow. Then exit, because we only have one buffer to
* handle this case. */
dpif_netlink_flow_to_dpif_flow(&dpif->dpif, &flows[n_flows++],
&datapath_flow);
break;
}
}
return n_flows;
}
static void
dpif_netlink_encode_execute(int dp_ifindex, const struct dpif_execute *d_exec,
struct ofpbuf *buf)
{
struct ovs_header *k_exec;
size_t key_ofs;
ofpbuf_prealloc_tailroom(buf, (64
+ dp_packet_size(d_exec->packet)
+ ODP_KEY_METADATA_SIZE
+ d_exec->actions_len));
nl_msg_put_genlmsghdr(buf, 0, ovs_packet_family, NLM_F_REQUEST,
OVS_PACKET_CMD_EXECUTE, OVS_PACKET_VERSION);
k_exec = ofpbuf_put_uninit(buf, sizeof *k_exec);
k_exec->dp_ifindex = dp_ifindex;
nl_msg_put_unspec(buf, OVS_PACKET_ATTR_PACKET,
dp_packet_data(d_exec->packet),
dp_packet_size(d_exec->packet));
key_ofs = nl_msg_start_nested(buf, OVS_PACKET_ATTR_KEY);
odp_key_from_pkt_metadata(buf, &d_exec->packet->md);
nl_msg_end_nested(buf, key_ofs);
nl_msg_put_unspec(buf, OVS_PACKET_ATTR_ACTIONS,
d_exec->actions, d_exec->actions_len);
if (d_exec->probe) {
nl_msg_put_flag(buf, OVS_PACKET_ATTR_PROBE);
}
if (d_exec->mtu) {
nl_msg_put_u16(buf, OVS_PACKET_ATTR_MRU, d_exec->mtu);
}
}
/* Executes, against 'dpif', up to the first 'n_ops' operations in 'ops'.
* Returns the number actually executed (at least 1, if 'n_ops' is
* positive). */
static size_t
dpif_netlink_operate__(struct dpif_netlink *dpif,
struct dpif_op **ops, size_t n_ops)
{
enum { MAX_OPS = 50 };
struct op_auxdata {
struct nl_transaction txn;
struct ofpbuf request;
uint64_t request_stub[1024 / 8];
struct ofpbuf reply;
uint64_t reply_stub[1024 / 8];
} auxes[MAX_OPS];
struct nl_transaction *txnsp[MAX_OPS];
size_t i;
n_ops = MIN(n_ops, MAX_OPS);
for (i = 0; i < n_ops; i++) {
struct op_auxdata *aux = &auxes[i];
struct dpif_op *op = ops[i];
struct dpif_flow_put *put;
struct dpif_flow_del *del;
struct dpif_flow_get *get;
struct dpif_netlink_flow flow;
ofpbuf_use_stub(&aux->request,
aux->request_stub, sizeof aux->request_stub);
aux->txn.request = &aux->request;
ofpbuf_use_stub(&aux->reply, aux->reply_stub, sizeof aux->reply_stub);
aux->txn.reply = NULL;
switch (op->type) {
case DPIF_OP_FLOW_PUT:
put = &op->u.flow_put;
dpif_netlink_init_flow_put(dpif, put, &flow);
if (put->stats) {
flow.nlmsg_flags |= NLM_F_ECHO;
aux->txn.reply = &aux->reply;
}
dpif_netlink_flow_to_ofpbuf(&flow, &aux->request);
break;
case DPIF_OP_FLOW_DEL:
del = &op->u.flow_del;
dpif_netlink_init_flow_del(dpif, del, &flow);
if (del->stats) {
flow.nlmsg_flags |= NLM_F_ECHO;
aux->txn.reply = &aux->reply;
}
dpif_netlink_flow_to_ofpbuf(&flow, &aux->request);
break;
case DPIF_OP_EXECUTE:
/* Can't execute a packet that won't fit in a Netlink attribute. */
if (OVS_UNLIKELY(nl_attr_oversized(
dp_packet_size(op->u.execute.packet)))) {
/* Report an error immediately if this is the first operation.
* Otherwise the easiest thing to do is to postpone to the next
* call (when this will be the first operation). */
if (i == 0) {
VLOG_ERR_RL(&error_rl,
"dropping oversized %"PRIu32"-byte packet",
dp_packet_size(op->u.execute.packet));
op->error = ENOBUFS;
return 1;
}
n_ops = i;
} else {
dpif_netlink_encode_execute(dpif->dp_ifindex, &op->u.execute,
&aux->request);
}
break;
case DPIF_OP_FLOW_GET:
get = &op->u.flow_get;
dpif_netlink_init_flow_get(dpif, get, &flow);
aux->txn.reply = get->buffer;
dpif_netlink_flow_to_ofpbuf(&flow, &aux->request);
break;
default:
OVS_NOT_REACHED();
}
}
for (i = 0; i < n_ops; i++) {
txnsp[i] = &auxes[i].txn;
}
nl_transact_multiple(NETLINK_GENERIC, txnsp, n_ops);
for (i = 0; i < n_ops; i++) {
struct op_auxdata *aux = &auxes[i];
struct nl_transaction *txn = &auxes[i].txn;
struct dpif_op *op = ops[i];
struct dpif_flow_put *put;
struct dpif_flow_del *del;
struct dpif_flow_get *get;
op->error = txn->error;
switch (op->type) {
case DPIF_OP_FLOW_PUT:
put = &op->u.flow_put;
if (put->stats) {
if (!op->error) {
struct dpif_netlink_flow reply;
op->error = dpif_netlink_flow_from_ofpbuf(&reply,
txn->reply);
if (!op->error) {
dpif_netlink_flow_get_stats(&reply, put->stats);
}
}
}
break;
case DPIF_OP_FLOW_DEL:
del = &op->u.flow_del;
if (del->stats) {
if (!op->error) {
struct dpif_netlink_flow reply;
op->error = dpif_netlink_flow_from_ofpbuf(&reply,
txn->reply);
if (!op->error) {
dpif_netlink_flow_get_stats(&reply, del->stats);
}
}
}
break;
case DPIF_OP_EXECUTE:
break;
case DPIF_OP_FLOW_GET:
get = &op->u.flow_get;
if (!op->error) {
struct dpif_netlink_flow reply;
op->error = dpif_netlink_flow_from_ofpbuf(&reply, txn->reply);
if (!op->error) {
dpif_netlink_flow_to_dpif_flow(&dpif->dpif, get->flow,
&reply);
}
}
break;
default:
OVS_NOT_REACHED();
}
ofpbuf_uninit(&aux->request);
ofpbuf_uninit(&aux->reply);
}
return n_ops;
}
static void
dpif_netlink_operate(struct dpif *dpif_, struct dpif_op **ops, size_t n_ops)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
while (n_ops > 0) {
size_t chunk = dpif_netlink_operate__(dpif, ops, n_ops);
ops += chunk;
n_ops -= chunk;
}
}
#if _WIN32
static void
dpif_netlink_handler_uninit(struct dpif_handler *handler)
{
vport_delete_sock_pool(handler);
}
static int
dpif_netlink_handler_init(struct dpif_handler *handler)
{
return vport_create_sock_pool(handler);
}
#else
static int
dpif_netlink_handler_init(struct dpif_handler *handler)
{
handler->epoll_fd = epoll_create(10);
return handler->epoll_fd < 0 ? errno : 0;
}
static void
dpif_netlink_handler_uninit(struct dpif_handler *handler)
{
close(handler->epoll_fd);
}
#endif
/* Synchronizes 'channels' in 'dpif->handlers' with the set of vports
* currently in 'dpif' in the kernel, by adding a new set of channels for
* any kernel vport that lacks one and deleting any channels that have no
* backing kernel vports. */
static int
dpif_netlink_refresh_channels(struct dpif_netlink *dpif, uint32_t n_handlers)
OVS_REQ_WRLOCK(dpif->upcall_lock)
{
unsigned long int *keep_channels;
struct dpif_netlink_vport vport;
size_t keep_channels_nbits;
struct nl_dump dump;
uint64_t reply_stub[NL_DUMP_BUFSIZE / 8];
struct ofpbuf buf;
int retval = 0;
size_t i;
ovs_assert(!WINDOWS || n_handlers <= 1);
ovs_assert(!WINDOWS || dpif->n_handlers <= 1);
if (dpif->n_handlers != n_handlers) {
destroy_all_channels(dpif);
dpif->handlers = xzalloc(n_handlers * sizeof *dpif->handlers);
for (i = 0; i < n_handlers; i++) {
int error;
struct dpif_handler *handler = &dpif->handlers[i];
error = dpif_netlink_handler_init(handler);
if (error) {
size_t j;
struct dpif_handler *tmp = &dpif->handlers[i];
for (j = 0; j < i; j++) {
dpif_netlink_handler_uninit(tmp);
}
free(dpif->handlers);
dpif->handlers = NULL;
return error;
}
}
dpif->n_handlers = n_handlers;
}
for (i = 0; i < n_handlers; i++) {
struct dpif_handler *handler = &dpif->handlers[i];
handler->event_offset = handler->n_events = 0;
}
keep_channels_nbits = dpif->uc_array_size;
keep_channels = bitmap_allocate(keep_channels_nbits);
ofpbuf_use_stub(&buf, reply_stub, sizeof reply_stub);
dpif_netlink_port_dump_start__(dpif, &dump);
while (!dpif_netlink_port_dump_next__(dpif, &dump, &vport, &buf)) {
uint32_t port_no = odp_to_u32(vport.port_no);
uint32_t *upcall_pids = NULL;
int error;
if (port_no >= dpif->uc_array_size
|| !vport_get_pids(dpif, port_no, &upcall_pids)) {
struct nl_sock **socksp = vport_create_socksp(dpif, &error);
if (!socksp) {
goto error;
}
error = vport_add_channels(dpif, vport.port_no, socksp);
if (error) {
VLOG_INFO("%s: could not add channels for port %s",
dpif_name(&dpif->dpif), vport.name);
vport_del_socksp(dpif, socksp);
retval = error;
goto error;
}
upcall_pids = vport_socksp_to_pids(socksp, dpif->n_handlers);
free(socksp);
}
/* Configure the vport to deliver misses to 'sock'. */
if (vport.upcall_pids[0] == 0
|| vport.n_upcall_pids != dpif->n_handlers
|| memcmp(upcall_pids, vport.upcall_pids, n_handlers * sizeof
*upcall_pids)) {
struct dpif_netlink_vport vport_request;
dpif_netlink_vport_init(&vport_request);
vport_request.cmd = OVS_VPORT_CMD_SET;
vport_request.dp_ifindex = dpif->dp_ifindex;
vport_request.port_no = vport.port_no;
vport_request.n_upcall_pids = dpif->n_handlers;
vport_request.upcall_pids = upcall_pids;
error = dpif_netlink_vport_transact(&vport_request, NULL, NULL);
if (error) {
VLOG_WARN_RL(&error_rl,
"%s: failed to set upcall pid on port: %s",
dpif_name(&dpif->dpif), ovs_strerror(error));
if (error != ENODEV && error != ENOENT) {
retval = error;
} else {
/* The vport isn't really there, even though the dump says
* it is. Probably we just hit a race after a port
* disappeared. */
}
goto error;
}
}
if (port_no < keep_channels_nbits) {
bitmap_set1(keep_channels, port_no);
}
free(upcall_pids);
continue;
error:
free(upcall_pids);
vport_del_channels(dpif, vport.port_no);
}
nl_dump_done(&dump);
ofpbuf_uninit(&buf);
/* Discard any saved channels that we didn't reuse. */
for (i = 0; i < keep_channels_nbits; i++) {
if (!bitmap_is_set(keep_channels, i)) {
vport_del_channels(dpif, u32_to_odp(i));
}
}
free(keep_channels);
return retval;
}
static int
dpif_netlink_recv_set__(struct dpif_netlink *dpif, bool enable)
OVS_REQ_WRLOCK(dpif->upcall_lock)
{
if ((dpif->handlers != NULL) == enable) {
return 0;
} else if (!enable) {
destroy_all_channels(dpif);
return 0;
} else {
return dpif_netlink_refresh_channels(dpif, 1);
}
}
static int
dpif_netlink_recv_set(struct dpif *dpif_, bool enable)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
int error;
fat_rwlock_wrlock(&dpif->upcall_lock);
error = dpif_netlink_recv_set__(dpif, enable);
fat_rwlock_unlock(&dpif->upcall_lock);
return error;
}
static int
dpif_netlink_handlers_set(struct dpif *dpif_, uint32_t n_handlers)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
int error = 0;
#ifdef _WIN32
/* Multiple upcall handlers will be supported once kernel datapath supports
* it. */
if (n_handlers > 1) {
return error;
}
#endif
fat_rwlock_wrlock(&dpif->upcall_lock);
if (dpif->handlers) {
error = dpif_netlink_refresh_channels(dpif, n_handlers);
}
fat_rwlock_unlock(&dpif->upcall_lock);
return error;
}
static int
dpif_netlink_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(const struct dpif_netlink *dpif, 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_UNSPEC, .optional = true },
[OVS_PACKET_ATTR_EGRESS_TUN_KEY] = { .type = NL_A_NESTED, .optional = true },
[OVS_PACKET_ATTR_ACTIONS] = { .type = NL_A_NESTED, .optional = true },
[OVS_PACKET_ATTR_MRU] = { .type = NL_A_U16, .optional = true }
};
struct ofpbuf b = ofpbuf_const_initializer(buf->data, buf->size);
struct nlmsghdr *nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
struct genlmsghdr *genl = ofpbuf_try_pull(&b, sizeof *genl);
struct ovs_header *ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
struct nlattr *a[ARRAY_SIZE(ovs_packet_policy)];
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;
}
int type = (genl->cmd == OVS_PACKET_CMD_MISS ? DPIF_UC_MISS
: genl->cmd == OVS_PACKET_CMD_ACTION ? DPIF_UC_ACTION
: -1);
if (type < 0) {
return EINVAL;
}
/* (Re)set ALL fields of '*upcall' on successful return. */
upcall->type = type;
upcall->key = CONST_CAST(struct nlattr *,
nl_attr_get(a[OVS_PACKET_ATTR_KEY]));
upcall->key_len = nl_attr_get_size(a[OVS_PACKET_ATTR_KEY]);
dpif_flow_hash(&dpif->dpif, upcall->key, upcall->key_len, &upcall->ufid);
upcall->userdata = a[OVS_PACKET_ATTR_USERDATA];
upcall->out_tun_key = a[OVS_PACKET_ATTR_EGRESS_TUN_KEY];
upcall->actions = a[OVS_PACKET_ATTR_ACTIONS];
upcall->mru = a[OVS_PACKET_ATTR_MRU];
/* Allow overwriting the netlink attribute header without reallocating. */
dp_packet_use_stub(&upcall->packet,
CONST_CAST(struct nlattr *,
nl_attr_get(a[OVS_PACKET_ATTR_PACKET])) - 1,
nl_attr_get_size(a[OVS_PACKET_ATTR_PACKET]) +
sizeof(struct nlattr));
dp_packet_set_data(&upcall->packet,
(char *)dp_packet_data(&upcall->packet) + sizeof(struct nlattr));
dp_packet_set_size(&upcall->packet, nl_attr_get_size(a[OVS_PACKET_ATTR_PACKET]));
*dp_ifindex = ovs_header->dp_ifindex;
return 0;
}
#ifdef _WIN32
#define PACKET_RECV_BATCH_SIZE 50
static int
dpif_netlink_recv_windows(struct dpif_netlink *dpif, uint32_t handler_id,
struct dpif_upcall *upcall, struct ofpbuf *buf)
OVS_REQ_RDLOCK(dpif->upcall_lock)
{
struct dpif_handler *handler;
int read_tries = 0;
struct dpif_windows_vport_sock *sock_pool;
uint32_t i;
if (!dpif->handlers) {
return EAGAIN;
}
/* Only one handler is supported currently. */
if (handler_id >= 1) {
return EAGAIN;
}
if (handler_id >= dpif->n_handlers) {
return EAGAIN;
}
handler = &dpif->handlers[handler_id];
sock_pool = handler->vport_sock_pool;
for (i = 0; i < VPORT_SOCK_POOL_SIZE; i++) {
for (;;) {
int dp_ifindex;
int error;
if (++read_tries > PACKET_RECV_BATCH_SIZE) {
return EAGAIN;
}
error = nl_sock_recv(sock_pool[i].nl_sock, buf, false);
if (error == ENOBUFS) {
/* ENOBUFS typically means that we've received so many
* packets that the buffer overflowed. Try again
* immediately because there's almost certainly a packet
* waiting for us. */
/* XXX: report_loss(dpif, ch, idx, handler_id); */
continue;
}
/* XXX: ch->last_poll = time_msec(); */
if (error) {
if (error == EAGAIN) {
break;
}
return error;
}
error = parse_odp_packet(dpif, buf, upcall, &dp_ifindex);
if (!error && dp_ifindex == dpif->dp_ifindex) {
return 0;
} else if (error) {
return error;
}
}
}
return EAGAIN;
}
#else
static int
dpif_netlink_recv__(struct dpif_netlink *dpif, uint32_t handler_id,
struct dpif_upcall *upcall, struct ofpbuf *buf)
OVS_REQ_RDLOCK(dpif->upcall_lock)
{
struct dpif_handler *handler;
int read_tries = 0;
if (!dpif->handlers || handler_id >= dpif->n_handlers) {
return EAGAIN;
}
handler = &dpif->handlers[handler_id];
if (handler->event_offset >= handler->n_events) {
int retval;
handler->event_offset = handler->n_events = 0;
do {
retval = epoll_wait(handler->epoll_fd, handler->epoll_events,
dpif->uc_array_size, 0);
} while (retval < 0 && errno == EINTR);
if (retval < 0) {
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
VLOG_WARN_RL(&rl, "epoll_wait failed (%s)", ovs_strerror(errno));
} else if (retval > 0) {
handler->n_events = retval;
}
}
while (handler->event_offset < handler->n_events) {
int idx = handler->epoll_events[handler->event_offset].data.u32;
struct dpif_channel *ch = &dpif->handlers[handler_id].channels[idx];
handler->event_offset++;
for (;;) {
int dp_ifindex;
int error;
if (++read_tries > 50) {
return EAGAIN;
}
error = nl_sock_recv(ch->sock, buf, false);
if (error == ENOBUFS) {
/* ENOBUFS typically means that we've received so many
* packets that the buffer overflowed. Try again
* immediately because there's almost certainly a packet
* waiting for us. */
report_loss(dpif, ch, idx, handler_id);
continue;
}
ch->last_poll = time_msec();
if (error) {
if (error == EAGAIN) {
break;
}
return error;
}
error = parse_odp_packet(dpif, buf, upcall, &dp_ifindex);
if (!error && dp_ifindex == dpif->dp_ifindex) {
return 0;
} else if (error) {
return error;
}
}
}
return EAGAIN;
}
#endif
static int
dpif_netlink_recv(struct dpif *dpif_, uint32_t handler_id,
struct dpif_upcall *upcall, struct ofpbuf *buf)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
int error;
fat_rwlock_rdlock(&dpif->upcall_lock);
#ifdef _WIN32
error = dpif_netlink_recv_windows(dpif, handler_id, upcall, buf);
#else
error = dpif_netlink_recv__(dpif, handler_id, upcall, buf);
#endif
fat_rwlock_unlock(&dpif->upcall_lock);
return error;
}
static void
dpif_netlink_recv_wait__(struct dpif_netlink *dpif, uint32_t handler_id)
OVS_REQ_RDLOCK(dpif->upcall_lock)
{
#ifdef _WIN32
uint32_t i;
struct dpif_windows_vport_sock *sock_pool =
dpif->handlers[handler_id].vport_sock_pool;
/* Only one handler is supported currently. */
if (handler_id >= 1) {
return;
}
for (i = 0; i < VPORT_SOCK_POOL_SIZE; i++) {
nl_sock_wait(sock_pool[i].nl_sock, POLLIN);
}
#else
if (dpif->handlers && handler_id < dpif->n_handlers) {
struct dpif_handler *handler = &dpif->handlers[handler_id];
poll_fd_wait(handler->epoll_fd, POLLIN);
}
#endif
}
static void
dpif_netlink_recv_wait(struct dpif *dpif_, uint32_t handler_id)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
fat_rwlock_rdlock(&dpif->upcall_lock);
dpif_netlink_recv_wait__(dpif, handler_id);
fat_rwlock_unlock(&dpif->upcall_lock);
}
static void
dpif_netlink_recv_purge__(struct dpif_netlink *dpif)
OVS_REQ_WRLOCK(dpif->upcall_lock)
{
if (dpif->handlers) {
size_t i, j;
for (i = 0; i < dpif->uc_array_size; i++ ) {
if (!dpif->handlers[0].channels[i].sock) {
continue;
}
for (j = 0; j < dpif->n_handlers; j++) {
nl_sock_drain(dpif->handlers[j].channels[i].sock);
}
}
}
}
static void
dpif_netlink_recv_purge(struct dpif *dpif_)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
fat_rwlock_wrlock(&dpif->upcall_lock);
dpif_netlink_recv_purge__(dpif);
fat_rwlock_unlock(&dpif->upcall_lock);
}
static char *
dpif_netlink_get_datapath_version(void)
{
char *version_str = NULL;
#ifdef __linux__
#define MAX_VERSION_STR_SIZE 80
#define LINUX_DATAPATH_VERSION_FILE "/sys/module/openvswitch/version"
FILE *f;
f = fopen(LINUX_DATAPATH_VERSION_FILE, "r");
if (f) {
char *newline;
char version[MAX_VERSION_STR_SIZE];
if (fgets(version, MAX_VERSION_STR_SIZE, f)) {
newline = strchr(version, '\n');
if (newline) {
*newline = '\0';
}
version_str = xstrdup(version);
}
fclose(f);
}
#endif
return version_str;
}
struct dpif_netlink_ct_dump_state {
struct ct_dpif_dump_state up;
struct nl_ct_dump_state *nl_ct_dump;
};
static int
dpif_netlink_ct_dump_start(struct dpif *dpif OVS_UNUSED,
struct ct_dpif_dump_state **dump_,
const uint16_t *zone)
{
struct dpif_netlink_ct_dump_state *dump;
int err;
dump = xzalloc(sizeof *dump);
err = nl_ct_dump_start(&dump->nl_ct_dump, zone);
if (err) {
free(dump);
return err;
}
*dump_ = &dump->up;
return 0;
}
static int
dpif_netlink_ct_dump_next(struct dpif *dpif OVS_UNUSED,
struct ct_dpif_dump_state *dump_,
struct ct_dpif_entry *entry)
{
struct dpif_netlink_ct_dump_state *dump;
INIT_CONTAINER(dump, dump_, up);
return nl_ct_dump_next(dump->nl_ct_dump, entry);
}
static int
dpif_netlink_ct_dump_done(struct dpif *dpif OVS_UNUSED,
struct ct_dpif_dump_state *dump_)
{
struct dpif_netlink_ct_dump_state *dump;
int err;
INIT_CONTAINER(dump, dump_, up);
err = nl_ct_dump_done(dump->nl_ct_dump);
free(dump);
return err;
}
static int
dpif_netlink_ct_flush(struct dpif *dpif OVS_UNUSED, const uint16_t *zone)
{
if (zone) {
return nl_ct_flush_zone(*zone);
} else {
return nl_ct_flush();
}
}
const struct dpif_class dpif_netlink_class = {
"system",
NULL, /* init */
dpif_netlink_enumerate,
NULL,
dpif_netlink_open,
dpif_netlink_close,
dpif_netlink_destroy,
dpif_netlink_run,
NULL, /* wait */
dpif_netlink_get_stats,
dpif_netlink_port_add,
dpif_netlink_port_del,
dpif_netlink_port_query_by_number,
dpif_netlink_port_query_by_name,
dpif_netlink_port_get_pid,
dpif_netlink_port_dump_start,
dpif_netlink_port_dump_next,
dpif_netlink_port_dump_done,
dpif_netlink_port_poll,
dpif_netlink_port_poll_wait,
dpif_netlink_flow_flush,
dpif_netlink_flow_dump_create,
dpif_netlink_flow_dump_destroy,
dpif_netlink_flow_dump_thread_create,
dpif_netlink_flow_dump_thread_destroy,
dpif_netlink_flow_dump_next,
dpif_netlink_operate,
dpif_netlink_recv_set,
dpif_netlink_handlers_set,
NULL, /* poll_thread_set */
dpif_netlink_queue_to_priority,
dpif_netlink_recv,
dpif_netlink_recv_wait,
dpif_netlink_recv_purge,
NULL, /* register_dp_purge_cb */
NULL, /* register_upcall_cb */
NULL, /* enable_upcall */
NULL, /* disable_upcall */
dpif_netlink_get_datapath_version, /* get_datapath_version */
dpif_netlink_ct_dump_start,
dpif_netlink_ct_dump_next,
dpif_netlink_ct_dump_done,
dpif_netlink_ct_flush
};
static int
dpif_netlink_init(void)
{
static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
static int error;
if (ovsthread_once_start(&once)) {
error = nl_lookup_genl_family(OVS_DATAPATH_FAMILY,
&ovs_datapath_family);
if (error) {
VLOG_WARN("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_lookup_genl_mcgroup(OVS_VPORT_FAMILY, OVS_VPORT_MCGROUP,
&ovs_vport_mcgroup);
}
ovsthread_once_done(&once);
}
return error;
}
bool
dpif_netlink_is_internal_device(const char *name)
{
struct dpif_netlink_vport reply;
struct ofpbuf *buf;
int error;
error = dpif_netlink_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, ovs_strerror(error));
}
return reply.type == OVS_VPORT_TYPE_INTERNAL;
}
/* 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_netlink_vport_from_ofpbuf(struct dpif_netlink_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_UPCALL_PID] = { .type = NL_A_UNSPEC },
[OVS_VPORT_ATTR_STATS] = { NL_POLICY_FOR(struct ovs_vport_stats),
.optional = true },
[OVS_VPORT_ATTR_OPTIONS] = { .type = NL_A_NESTED, .optional = true },
};
dpif_netlink_vport_init(vport);
struct ofpbuf b = ofpbuf_const_initializer(buf->data, buf->size);
struct nlmsghdr *nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
struct genlmsghdr *genl = ofpbuf_try_pull(&b, sizeof *genl);
struct ovs_header *ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
struct nlattr *a[ARRAY_SIZE(ovs_vport_policy)];
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_odp_port(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_UPCALL_PID]) {
vport->n_upcall_pids = nl_attr_get_size(a[OVS_VPORT_ATTR_UPCALL_PID])
/ (sizeof *vport->upcall_pids);
vport->upcall_pids = nl_attr_get(a[OVS_VPORT_ATTR_UPCALL_PID]);
}
if (a[OVS_VPORT_ATTR_STATS]) {
vport->stats = nl_attr_get(a[OVS_VPORT_ATTR_STATS]);
}
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]);
}
return 0;
}
/* Appends to 'buf' (which must initially be empty) a "struct ovs_header"
* followed by Netlink attributes corresponding to 'vport'. */
static void
dpif_netlink_vport_to_ofpbuf(const struct dpif_netlink_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, OVS_VPORT_VERSION);
ovs_header = ofpbuf_put_uninit(buf, sizeof *ovs_header);
ovs_header->dp_ifindex = vport->dp_ifindex;
if (vport->port_no != ODPP_NONE) {
nl_msg_put_odp_port(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->upcall_pids) {
nl_msg_put_unspec(buf, OVS_VPORT_ATTR_UPCALL_PID,
vport->upcall_pids,
vport->n_upcall_pids * sizeof *vport->upcall_pids);
}
if (vport->stats) {
nl_msg_put_unspec(buf, OVS_VPORT_ATTR_STATS,
vport->stats, sizeof *vport->stats);
}
if (vport->options) {
nl_msg_put_nested(buf, OVS_VPORT_ATTR_OPTIONS,
vport->options, vport->options_len);
}
}
/* Clears 'vport' to "empty" values. */
void
dpif_netlink_vport_init(struct dpif_netlink_vport *vport)
{
memset(vport, 0, sizeof *vport);
vport->port_no = ODPP_NONE;
}
/* 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_netlink_vport_transact(const struct dpif_netlink_vport *request,
struct dpif_netlink_vport *reply,
struct ofpbuf **bufp)
{
struct ofpbuf *request_buf;
int error;
ovs_assert((reply != NULL) == (bufp != NULL));
error = dpif_netlink_init();
if (error) {
if (reply) {
*bufp = NULL;
dpif_netlink_vport_init(reply);
}
return error;
}
request_buf = ofpbuf_new(1024);
dpif_netlink_vport_to_ofpbuf(request, request_buf);
error = nl_transact(NETLINK_GENERIC, request_buf, bufp);
ofpbuf_delete(request_buf);
if (reply) {
if (!error) {
error = dpif_netlink_vport_from_ofpbuf(reply, *bufp);
}
if (error) {
dpif_netlink_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_netlink_vport_get(const char *name, struct dpif_netlink_vport *reply,
struct ofpbuf **bufp)
{
struct dpif_netlink_vport request;
dpif_netlink_vport_init(&request);
request.cmd = OVS_VPORT_CMD_GET;
request.name = name;
return dpif_netlink_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_netlink_dp_from_ofpbuf(struct dpif_netlink_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] = { NL_POLICY_FOR(struct ovs_dp_stats),
.optional = true },
[OVS_DP_ATTR_MEGAFLOW_STATS] = {
NL_POLICY_FOR(struct ovs_dp_megaflow_stats),
.optional = true },
};
dpif_netlink_dp_init(dp);
struct ofpbuf b = ofpbuf_const_initializer(buf->data, buf->size);
struct nlmsghdr *nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
struct genlmsghdr *genl = ofpbuf_try_pull(&b, sizeof *genl);
struct ovs_header *ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
struct nlattr *a[ARRAY_SIZE(ovs_datapath_policy)];
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]) {
dp->stats = nl_attr_get(a[OVS_DP_ATTR_STATS]);
}
if (a[OVS_DP_ATTR_MEGAFLOW_STATS]) {
dp->megaflow_stats = nl_attr_get(a[OVS_DP_ATTR_MEGAFLOW_STATS]);
}
return 0;
}
/* Appends to 'buf' the Generic Netlink message described by 'dp'. */
static void
dpif_netlink_dp_to_ofpbuf(const struct dpif_netlink_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,
OVS_DATAPATH_VERSION);
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);
}
if (dp->upcall_pid) {
nl_msg_put_u32(buf, OVS_DP_ATTR_UPCALL_PID, *dp->upcall_pid);
}
if (dp->user_features) {
nl_msg_put_u32(buf, OVS_DP_ATTR_USER_FEATURES, dp->user_features);
}
/* Skip OVS_DP_ATTR_STATS since we never have a reason to serialize it. */
}
/* Clears 'dp' to "empty" values. */
static void
dpif_netlink_dp_init(struct dpif_netlink_dp *dp)
{
memset(dp, 0, sizeof *dp);
}
static void
dpif_netlink_dp_dump_start(struct nl_dump *dump)
{
struct dpif_netlink_dp request;
struct ofpbuf *buf;
dpif_netlink_dp_init(&request);
request.cmd = OVS_DP_CMD_GET;
buf = ofpbuf_new(1024);
dpif_netlink_dp_to_ofpbuf(&request, buf);
nl_dump_start(dump, NETLINK_GENERIC, 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_netlink_dp_transact(const struct dpif_netlink_dp *request,
struct dpif_netlink_dp *reply, struct ofpbuf **bufp)
{
struct ofpbuf *request_buf;
int error;
ovs_assert((reply != NULL) == (bufp != NULL));
request_buf = ofpbuf_new(1024);
dpif_netlink_dp_to_ofpbuf(request, request_buf);
error = nl_transact(NETLINK_GENERIC, request_buf, bufp);
ofpbuf_delete(request_buf);
if (reply) {
dpif_netlink_dp_init(reply);
if (!error) {
error = dpif_netlink_dp_from_ofpbuf(reply, *bufp);
}
if (error) {
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_netlink_dp_get(const struct dpif *dpif_, struct dpif_netlink_dp *reply,
struct ofpbuf **bufp)
{
struct dpif_netlink *dpif = dpif_netlink_cast(dpif_);
struct dpif_netlink_dp request;
dpif_netlink_dp_init(&request);
request.cmd = OVS_DP_CMD_GET;
request.dp_ifindex = dpif->dp_ifindex;
return dpif_netlink_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_netlink_flow_from_ofpbuf(struct dpif_netlink_flow *flow,
const struct ofpbuf *buf)
{
static const struct nl_policy ovs_flow_policy[__OVS_FLOW_ATTR_MAX] = {
[OVS_FLOW_ATTR_KEY] = { .type = NL_A_NESTED, .optional = true },
[OVS_FLOW_ATTR_MASK] = { .type = NL_A_NESTED, .optional = true },
[OVS_FLOW_ATTR_ACTIONS] = { .type = NL_A_NESTED, .optional = true },
[OVS_FLOW_ATTR_STATS] = { NL_POLICY_FOR(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 },
[OVS_FLOW_ATTR_UFID] = { .type = NL_A_UNSPEC, .optional = true,
.min_len = sizeof(ovs_u128) },
/* The kernel never uses OVS_FLOW_ATTR_CLEAR. */
/* The kernel never uses OVS_FLOW_ATTR_PROBE. */
/* The kernel never uses OVS_FLOW_ATTR_UFID_FLAGS. */
};
dpif_netlink_flow_init(flow);
struct ofpbuf b = ofpbuf_const_initializer(buf->data, buf->size);
struct nlmsghdr *nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
struct genlmsghdr *genl = ofpbuf_try_pull(&b, sizeof *genl);
struct ovs_header *ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
struct nlattr *a[ARRAY_SIZE(ovs_flow_policy)];
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;
}
if (!a[OVS_FLOW_ATTR_KEY] && !a[OVS_FLOW_ATTR_UFID]) {
return EINVAL;
}
flow->nlmsg_flags = nlmsg->nlmsg_flags;
flow->dp_ifindex = ovs_header->dp_ifindex;
if (a[OVS_FLOW_ATTR_KEY]) {
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_UFID]) {
const ovs_u128 *ufid;
ufid = nl_attr_get_unspec(a[OVS_FLOW_ATTR_UFID],
nl_attr_get_size(a[OVS_FLOW_ATTR_UFID]));
flow->ufid = *ufid;
flow->ufid_present = true;
}
if (a[OVS_FLOW_ATTR_MASK]) {
flow->mask = nl_attr_get(a[OVS_FLOW_ATTR_MASK]);
flow->mask_len = nl_attr_get_size(a[OVS_FLOW_ATTR_MASK]);
}
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_netlink_flow_to_ofpbuf(const struct dpif_netlink_flow *flow,
struct ofpbuf *buf)
{
struct ovs_header *ovs_header;
nl_msg_put_genlmsghdr(buf, 0, ovs_flow_family,
NLM_F_REQUEST | flow->nlmsg_flags,
flow->cmd, OVS_FLOW_VERSION);
ovs_header = ofpbuf_put_uninit(buf, sizeof *ovs_header);
ovs_header->dp_ifindex = flow->dp_ifindex;
if (flow->ufid_present) {
nl_msg_put_unspec(buf, OVS_FLOW_ATTR_UFID, &flow->ufid,
sizeof flow->ufid);
}
if (flow->ufid_terse) {
nl_msg_put_u32(buf, OVS_FLOW_ATTR_UFID_FLAGS,
OVS_UFID_F_OMIT_KEY | OVS_UFID_F_OMIT_MASK
| OVS_UFID_F_OMIT_ACTIONS);
}
if (!flow->ufid_terse || !flow->ufid_present) {
if (flow->key_len) {
nl_msg_put_unspec(buf, OVS_FLOW_ATTR_KEY,
flow->key, flow->key_len);
}
if (flow->mask_len) {
nl_msg_put_unspec(buf, OVS_FLOW_ATTR_MASK,
flow->mask, flow->mask_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. */
ovs_assert(!flow->stats);
ovs_assert(!flow->tcp_flags);
ovs_assert(!flow->used);
if (flow->clear) {
nl_msg_put_flag(buf, OVS_FLOW_ATTR_CLEAR);
}
if (flow->probe) {
nl_msg_put_flag(buf, OVS_FLOW_ATTR_PROBE);
}
}
/* Clears 'flow' to "empty" values. */
static void
dpif_netlink_flow_init(struct dpif_netlink_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_netlink_flow_transact(struct dpif_netlink_flow *request,
struct dpif_netlink_flow *reply,
struct ofpbuf **bufp)
{
struct ofpbuf *request_buf;
int error;
ovs_assert((reply != NULL) == (bufp != NULL));
if (reply) {
request->nlmsg_flags |= NLM_F_ECHO;
}
request_buf = ofpbuf_new(1024);
dpif_netlink_flow_to_ofpbuf(request, request_buf);
error = nl_transact(NETLINK_GENERIC, request_buf, bufp);
ofpbuf_delete(request_buf);
if (reply) {
if (!error) {
error = dpif_netlink_flow_from_ofpbuf(reply, *bufp);
}
if (error) {
dpif_netlink_flow_init(reply);
ofpbuf_delete(*bufp);
*bufp = NULL;
}
}
return error;
}
static void
dpif_netlink_flow_get_stats(const struct dpif_netlink_flow *flow,
struct dpif_flow_stats *stats)
{
if (flow->stats) {
stats->n_packets = get_32aligned_u64(&flow->stats->n_packets);
stats->n_bytes = get_32aligned_u64(&flow->stats->n_bytes);
} else {
stats->n_packets = 0;
stats->n_bytes = 0;
}
stats->used = flow->used ? get_32aligned_u64(flow->used) : 0;
stats->tcp_flags = flow->tcp_flags ? *flow->tcp_flags : 0;
}
/* Logs information about a packet that was recently lost in 'ch' (in
* 'dpif_'). */
static void
report_loss(struct dpif_netlink *dpif, struct dpif_channel *ch, uint32_t ch_idx,
uint32_t handler_id)
{
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5);
struct ds s;
if (VLOG_DROP_WARN(&rl)) {
return;
}
ds_init(&s);
if (ch->last_poll != LLONG_MIN) {
ds_put_format(&s, " (last polled %lld ms ago)",
time_msec() - ch->last_poll);
}
VLOG_WARN("%s: lost packet on port channel %u of handler %u",
dpif_name(&dpif->dpif), ch_idx, handler_id);
ds_destroy(&s);
}
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