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ovs/lib/dpif-netdev.c
Ben Pfaff ecf9ebff6c dpif-netdev: Allow for Ethernet and VLAN header in buffer size calculation. 
This is a long-standing bug--it was present in version 1.0 too.

Reported-by: Gaetano Catalli <gaetano.catalli@gmail.com>
Solution by Jesse Gross <jesse@nicira.com>
2011-01-24 12:44:19 -08:00

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/*
* Copyright (c) 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.h"
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <net/if.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <unistd.h>
#include "csum.h"
#include "dpif.h"
#include "dpif-provider.h"
#include "dummy.h"
#include "flow.h"
#include "hmap.h"
#include "list.h"
#include "netdev.h"
#include "netlink.h"
#include "odp-util.h"
#include "ofp-print.h"
#include "ofpbuf.h"
#include "packets.h"
#include "poll-loop.h"
#include "shash.h"
#include "timeval.h"
#include "util.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(dpif_netdev);
/* Configuration parameters. */
enum { N_QUEUES = 2 }; /* Number of queues for dpif_recv(). */
enum { MAX_QUEUE_LEN = 100 }; /* Maximum number of packets per queue. */
enum { MAX_PORTS = 256 }; /* Maximum number of ports. */
enum { MAX_FLOWS = 65536 }; /* Maximum number of flows in flow table. */
/* Enough headroom to add a vlan tag, plus an extra 2 bytes to allow IP
* headers to be aligned on a 4-byte boundary. */
enum { DP_NETDEV_HEADROOM = 2 + VLAN_HEADER_LEN };
/* Datapath based on the network device interface from netdev.h. */
struct dp_netdev {
const struct dpif_class *class;
char *name;
int open_cnt;
bool destroyed;
bool drop_frags; /* Drop all IP fragments, if true. */
struct list queues[N_QUEUES]; /* Contain ofpbufs queued for dpif_recv(). */
size_t queue_len[N_QUEUES]; /* Number of packets in each queue. */
struct hmap flow_table; /* Flow table. */
/* Statistics. */
long long int n_frags; /* Number of dropped IP fragments. */
long long int n_hit; /* Number of flow table matches. */
long long int n_missed; /* Number of flow table misses. */
long long int n_lost; /* Number of misses not passed to client. */
/* Ports. */
int n_ports;
struct dp_netdev_port *ports[MAX_PORTS];
struct list port_list;
unsigned int serial;
};
/* A port in a netdev-based datapath. */
struct dp_netdev_port {
int port_no; /* Index into dp_netdev's 'ports'. */
struct list node; /* Element in dp_netdev's 'port_list'. */
struct netdev *netdev;
bool internal; /* Internal port? */
};
/* A flow in dp_netdev's 'flow_table'. */
struct dp_netdev_flow {
struct hmap_node node; /* Element in dp_netdev's 'flow_table'. */
struct flow key;
/* Statistics. */
struct timespec used; /* Last used time. */
long long int packet_count; /* Number of packets matched. */
long long int byte_count; /* Number of bytes matched. */
uint16_t tcp_ctl; /* Bitwise-OR of seen tcp_ctl values. */
/* Actions. */
struct nlattr *actions;
size_t actions_len;
};
/* Interface to netdev-based datapath. */
struct dpif_netdev {
struct dpif dpif;
struct dp_netdev *dp;
int listen_mask;
unsigned int dp_serial;
};
/* All netdev-based datapaths. */
static struct shash dp_netdevs = SHASH_INITIALIZER(&dp_netdevs);
/* Maximum port MTU seen so far. */
static int max_mtu = ETH_PAYLOAD_MAX;
static int get_port_by_number(struct dp_netdev *, uint16_t port_no,
struct dp_netdev_port **portp);
static int get_port_by_name(struct dp_netdev *, const char *devname,
struct dp_netdev_port **portp);
static void dp_netdev_free(struct dp_netdev *);
static void dp_netdev_flow_flush(struct dp_netdev *);
static int do_add_port(struct dp_netdev *, const char *devname,
const char *type, uint16_t port_no);
static int do_del_port(struct dp_netdev *, uint16_t port_no);
static int dpif_netdev_open(const struct dpif_class *, const char *name,
bool create, struct dpif **);
static int dp_netdev_output_control(struct dp_netdev *, const struct ofpbuf *,
int queue_no, int port_no, uint64_t arg);
static int dp_netdev_execute_actions(struct dp_netdev *,
struct ofpbuf *, struct flow *,
const struct nlattr *actions,
size_t actions_len);
static struct dpif_class dpif_dummy_class;
static struct dpif_netdev *
dpif_netdev_cast(const struct dpif *dpif)
{
assert(dpif->dpif_class->open == dpif_netdev_open);
return CONTAINER_OF(dpif, struct dpif_netdev, dpif);
}
static struct dp_netdev *
get_dp_netdev(const struct dpif *dpif)
{
return dpif_netdev_cast(dpif)->dp;
}
static struct dpif *
create_dpif_netdev(struct dp_netdev *dp)
{
uint16_t netflow_id = hash_string(dp->name, 0);
struct dpif_netdev *dpif;
dp->open_cnt++;
dpif = xmalloc(sizeof *dpif);
dpif_init(&dpif->dpif, dp->class, dp->name, netflow_id >> 8, netflow_id);
dpif->dp = dp;
dpif->listen_mask = 0;
dpif->dp_serial = dp->serial;
return &dpif->dpif;
}
static int
create_dp_netdev(const char *name, const struct dpif_class *class,
struct dp_netdev **dpp)
{
struct dp_netdev *dp;
int error;
int i;
dp = xzalloc(sizeof *dp);
dp->class = class;
dp->name = xstrdup(name);
dp->open_cnt = 0;
dp->drop_frags = false;
for (i = 0; i < N_QUEUES; i++) {
list_init(&dp->queues[i]);
}
hmap_init(&dp->flow_table);
list_init(&dp->port_list);
error = do_add_port(dp, name, "internal", ODPP_LOCAL);
if (error) {
dp_netdev_free(dp);
return error;
}
shash_add(&dp_netdevs, name, dp);
*dpp = dp;
return 0;
}
static int
dpif_netdev_open(const struct dpif_class *class, const char *name,
bool create, struct dpif **dpifp)
{
struct dp_netdev *dp;
dp = shash_find_data(&dp_netdevs, name);
if (!dp) {
if (!create) {
return ENODEV;
} else {
int error = create_dp_netdev(name, class, &dp);
if (error) {
return error;
}
assert(dp != NULL);
}
} else {
if (dp->class != class) {
return EINVAL;
} else if (create) {
return EEXIST;
}
}
*dpifp = create_dpif_netdev(dp);
return 0;
}
static void
dp_netdev_free(struct dp_netdev *dp)
{
int i;
dp_netdev_flow_flush(dp);
while (dp->n_ports > 0) {
struct dp_netdev_port *port = CONTAINER_OF(
dp->port_list.next, struct dp_netdev_port, node);
do_del_port(dp, port->port_no);
}
for (i = 0; i < N_QUEUES; i++) {
ofpbuf_list_delete(&dp->queues[i]);
}
hmap_destroy(&dp->flow_table);
free(dp->name);
free(dp);
}
static void
dpif_netdev_close(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
assert(dp->open_cnt > 0);
if (--dp->open_cnt == 0 && dp->destroyed) {
shash_find_and_delete(&dp_netdevs, dp->name);
dp_netdev_free(dp);
}
free(dpif);
}
static int
dpif_netdev_destroy(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
dp->destroyed = true;
return 0;
}
static int
dpif_netdev_get_stats(const struct dpif *dpif, struct odp_stats *stats)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
memset(stats, 0, sizeof *stats);
stats->n_flows = hmap_count(&dp->flow_table);
stats->cur_capacity = hmap_capacity(&dp->flow_table);
stats->max_capacity = MAX_FLOWS;
stats->n_ports = dp->n_ports;
stats->max_ports = MAX_PORTS;
stats->n_frags = dp->n_frags;
stats->n_hit = dp->n_hit;
stats->n_missed = dp->n_missed;
stats->n_lost = dp->n_lost;
stats->max_miss_queue = MAX_QUEUE_LEN;
stats->max_action_queue = MAX_QUEUE_LEN;
return 0;
}
static int
dpif_netdev_get_drop_frags(const struct dpif *dpif, bool *drop_fragsp)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
*drop_fragsp = dp->drop_frags;
return 0;
}
static int
dpif_netdev_set_drop_frags(struct dpif *dpif, bool drop_frags)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
dp->drop_frags = drop_frags;
return 0;
}
static int
do_add_port(struct dp_netdev *dp, const char *devname, const char *type,
uint16_t port_no)
{
struct dp_netdev_port *port;
struct netdev_options netdev_options;
struct netdev *netdev;
bool internal;
int mtu;
int error;
/* XXX reject devices already in some dp_netdev. */
if (type[0] == '\0' || !strcmp(type, "system")) {
internal = false;
} else if (!strcmp(type, "internal")) {
internal = true;
} else {
VLOG_WARN("%s: unsupported port type %s", devname, type);
return EINVAL;
}
/* Open and validate network device. */
memset(&netdev_options, 0, sizeof netdev_options);
netdev_options.name = devname;
netdev_options.ethertype = NETDEV_ETH_TYPE_ANY;
if (dp->class == &dpif_dummy_class) {
netdev_options.type = "dummy";
} else if (internal) {
netdev_options.type = "tap";
}
error = netdev_open(&netdev_options, &netdev);
if (error) {
return error;
}
/* XXX reject loopback devices */
/* XXX reject non-Ethernet devices */
error = netdev_turn_flags_on(netdev, NETDEV_PROMISC, false);
if (error) {
netdev_close(netdev);
return error;
}
port = xmalloc(sizeof *port);
port->port_no = port_no;
port->netdev = netdev;
port->internal = internal;
netdev_get_mtu(netdev, &mtu);
if (mtu > max_mtu) {
max_mtu = mtu;
}
list_push_back(&dp->port_list, &port->node);
dp->ports[port_no] = port;
dp->n_ports++;
dp->serial++;
return 0;
}
static int
dpif_netdev_port_add(struct dpif *dpif, struct netdev *netdev,
uint16_t *port_nop)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
int port_no;
for (port_no = 0; port_no < MAX_PORTS; port_no++) {
if (!dp->ports[port_no]) {
*port_nop = port_no;
return do_add_port(dp, netdev_get_name(netdev),
netdev_get_type(netdev), port_no);
}
}
return EFBIG;
}
static int
dpif_netdev_port_del(struct dpif *dpif, uint16_t port_no)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
return port_no == ODPP_LOCAL ? EINVAL : do_del_port(dp, port_no);
}
static bool
is_valid_port_number(uint16_t port_no)
{
return port_no < MAX_PORTS;
}
static int
get_port_by_number(struct dp_netdev *dp,
uint16_t port_no, struct dp_netdev_port **portp)
{
if (!is_valid_port_number(port_no)) {
*portp = NULL;
return EINVAL;
} else {
*portp = dp->ports[port_no];
return *portp ? 0 : ENOENT;
}
}
static int
get_port_by_name(struct dp_netdev *dp,
const char *devname, struct dp_netdev_port **portp)
{
struct dp_netdev_port *port;
LIST_FOR_EACH (port, node, &dp->port_list) {
if (!strcmp(netdev_get_name(port->netdev), devname)) {
*portp = port;
return 0;
}
}
return ENOENT;
}
static int
do_del_port(struct dp_netdev *dp, uint16_t port_no)
{
struct dp_netdev_port *port;
char *name;
int error;
error = get_port_by_number(dp, port_no, &port);
if (error) {
return error;
}
list_remove(&port->node);
dp->ports[port->port_no] = NULL;
dp->n_ports--;
dp->serial++;
name = xstrdup(netdev_get_name(port->netdev));
netdev_close(port->netdev);
free(name);
free(port);
return 0;
}
static void
answer_port_query(const struct dp_netdev_port *port, struct odp_port *odp_port)
{
memset(odp_port, 0, sizeof *odp_port);
ovs_strlcpy(odp_port->devname, netdev_get_name(port->netdev),
sizeof odp_port->devname);
odp_port->port = port->port_no;
strcpy(odp_port->type, port->internal ? "internal" : "system");
}
static int
dpif_netdev_port_query_by_number(const struct dpif *dpif, uint16_t port_no,
struct odp_port *odp_port)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_port *port;
int error;
error = get_port_by_number(dp, port_no, &port);
if (!error) {
answer_port_query(port, odp_port);
}
return error;
}
static int
dpif_netdev_port_query_by_name(const struct dpif *dpif, const char *devname,
struct odp_port *odp_port)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_port *port;
int error;
error = get_port_by_name(dp, devname, &port);
if (!error) {
answer_port_query(port, odp_port);
}
return error;
}
static void
dp_netdev_free_flow(struct dp_netdev *dp, struct dp_netdev_flow *flow)
{
hmap_remove(&dp->flow_table, &flow->node);
free(flow->actions);
free(flow);
}
static void
dp_netdev_flow_flush(struct dp_netdev *dp)
{
struct dp_netdev_flow *flow, *next;
HMAP_FOR_EACH_SAFE (flow, next, node, &dp->flow_table) {
dp_netdev_free_flow(dp, flow);
}
}
static int
dpif_netdev_flow_flush(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
dp_netdev_flow_flush(dp);
return 0;
}
static int
dpif_netdev_port_list(const struct dpif *dpif, struct odp_port *ports, int n)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_port *port;
int i;
i = 0;
LIST_FOR_EACH (port, node, &dp->port_list) {
struct odp_port *odp_port = &ports[i];
if (i >= n) {
break;
}
answer_port_query(port, odp_port);
i++;
}
return dp->n_ports;
}
static int
dpif_netdev_port_poll(const struct dpif *dpif_, char **devnamep OVS_UNUSED)
{
struct dpif_netdev *dpif = dpif_netdev_cast(dpif_);
if (dpif->dp_serial != dpif->dp->serial) {
dpif->dp_serial = dpif->dp->serial;
return ENOBUFS;
} else {
return EAGAIN;
}
}
static void
dpif_netdev_port_poll_wait(const struct dpif *dpif_)
{
struct dpif_netdev *dpif = dpif_netdev_cast(dpif_);
if (dpif->dp_serial != dpif->dp->serial) {
poll_immediate_wake();
}
}
static struct dp_netdev_flow *
dp_netdev_lookup_flow(const struct dp_netdev *dp, const struct flow *key)
{
struct dp_netdev_flow *flow;
HMAP_FOR_EACH_WITH_HASH (flow, node, flow_hash(key, 0), &dp->flow_table) {
if (flow_equal(&flow->key, key)) {
return flow;
}
}
return NULL;
}
/* The caller must fill in odp_flow->key itself. */
static void
answer_flow_query(struct dp_netdev_flow *flow, uint32_t query_flags,
struct odp_flow *odp_flow)
{
if (flow) {
odp_flow->stats.n_packets = flow->packet_count;
odp_flow->stats.n_bytes = flow->byte_count;
odp_flow->stats.used_sec = flow->used.tv_sec;
odp_flow->stats.used_nsec = flow->used.tv_nsec;
odp_flow->stats.tcp_flags = TCP_FLAGS(flow->tcp_ctl);
odp_flow->stats.reserved = 0;
odp_flow->stats.error = 0;
if (odp_flow->actions_len > 0) {
memcpy(odp_flow->actions, flow->actions,
MIN(odp_flow->actions_len, flow->actions_len));
odp_flow->actions_len = flow->actions_len;
}
if (query_flags & ODPFF_ZERO_TCP_FLAGS) {
flow->tcp_ctl = 0;
}
} else {
odp_flow->stats.error = ENOENT;
}
}
static int
dpif_netdev_flow_get(const struct dpif *dpif, struct odp_flow flows[], int n)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
int i;
for (i = 0; i < n; i++) {
struct odp_flow *odp_flow = &flows[i];
struct flow key;
odp_flow_key_to_flow(&odp_flow->key, &key);
answer_flow_query(dp_netdev_lookup_flow(dp, &key),
odp_flow->flags, odp_flow);
}
return 0;
}
static int
dpif_netdev_validate_actions(const struct nlattr *actions,
size_t actions_len, bool *mutates)
{
const struct nlattr *a;
unsigned int left;
*mutates = false;
NL_ATTR_FOR_EACH (a, left, actions, actions_len) {
uint16_t type = nl_attr_type(a);
int len = odp_action_len(type);
if (len != nl_attr_get_size(a)) {
return EINVAL;
}
switch (type) {
case ODPAT_OUTPUT:
if (nl_attr_get_u32(a) >= MAX_PORTS) {
return EINVAL;
}
break;
case ODPAT_CONTROLLER:
case ODPAT_DROP_SPOOFED_ARP:
break;
case ODPAT_SET_DL_TCI:
*mutates = true;
if (nl_attr_get_be16(a) & htons(VLAN_CFI)) {
return EINVAL;
}
break;
case ODPAT_SET_NW_TOS:
*mutates = true;
if (nl_attr_get_u8(a) & IP_ECN_MASK) {
return EINVAL;
}
break;
case ODPAT_STRIP_VLAN:
case ODPAT_SET_DL_SRC:
case ODPAT_SET_DL_DST:
case ODPAT_SET_NW_SRC:
case ODPAT_SET_NW_DST:
case ODPAT_SET_TP_SRC:
case ODPAT_SET_TP_DST:
*mutates = true;
break;
case ODPAT_SET_TUNNEL:
case ODPAT_SET_PRIORITY:
case ODPAT_POP_PRIORITY:
default:
return EOPNOTSUPP;
}
}
return 0;
}
static int
set_flow_actions(struct dp_netdev_flow *flow, struct odp_flow *odp_flow)
{
bool mutates;
int error;
error = dpif_netdev_validate_actions(odp_flow->actions,
odp_flow->actions_len, &mutates);
if (error) {
return error;
}
flow->actions = xrealloc(flow->actions, odp_flow->actions_len);
flow->actions_len = odp_flow->actions_len;
memcpy(flow->actions, odp_flow->actions, odp_flow->actions_len);
return 0;
}
static int
add_flow(struct dpif *dpif, struct odp_flow *odp_flow)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_flow *flow;
int error;
flow = xzalloc(sizeof *flow);
odp_flow_key_to_flow(&odp_flow->key, &flow->key);
error = set_flow_actions(flow, odp_flow);
if (error) {
free(flow);
return error;
}
hmap_insert(&dp->flow_table, &flow->node, flow_hash(&flow->key, 0));
return 0;
}
static void
clear_stats(struct dp_netdev_flow *flow)
{
flow->used.tv_sec = 0;
flow->used.tv_nsec = 0;
flow->packet_count = 0;
flow->byte_count = 0;
flow->tcp_ctl = 0;
}
static int
dpif_netdev_flow_put(struct dpif *dpif, struct odp_flow_put *put)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_flow *flow;
struct flow key;
odp_flow_key_to_flow(&put->flow.key, &key);
flow = dp_netdev_lookup_flow(dp, &key);
if (!flow) {
if (put->flags & ODPPF_CREATE) {
if (hmap_count(&dp->flow_table) < MAX_FLOWS) {
return add_flow(dpif, &put->flow);
} else {
return EFBIG;
}
} else {
return ENOENT;
}
} else {
if (put->flags & ODPPF_MODIFY) {
int error = set_flow_actions(flow, &put->flow);
if (!error && put->flags & ODPPF_ZERO_STATS) {
clear_stats(flow);
}
return error;
} else {
return EEXIST;
}
}
}
static int
dpif_netdev_flow_del(struct dpif *dpif, struct odp_flow *odp_flow)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_flow *flow;
struct flow key;
odp_flow_key_to_flow(&odp_flow->key, &key);
flow = dp_netdev_lookup_flow(dp, &key);
if (flow) {
answer_flow_query(flow, 0, odp_flow);
dp_netdev_free_flow(dp, flow);
return 0;
} else {
return ENOENT;
}
}
static int
dpif_netdev_flow_list(const struct dpif *dpif, struct odp_flow flows[], int n)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_flow *flow;
int i;
i = 0;
HMAP_FOR_EACH (flow, node, &dp->flow_table) {
if (i >= n) {
break;
}
odp_flow_key_from_flow(&flows[i].key, &flow->key);
answer_flow_query(flow, 0, &flows[i]);
i++;
}
return hmap_count(&dp->flow_table);
}
static int
dpif_netdev_execute(struct dpif *dpif,
const struct nlattr *actions, size_t actions_len,
const struct ofpbuf *packet)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct ofpbuf copy;
bool mutates;
struct flow key;
int error;
if (packet->size < ETH_HEADER_LEN || packet->size > UINT16_MAX) {
return EINVAL;
}
error = dpif_netdev_validate_actions(actions, actions_len, &mutates);
if (error) {
return error;
}
if (mutates) {
/* We need a deep copy of 'packet' since we're going to modify its
* data. */
ofpbuf_init(&copy, DP_NETDEV_HEADROOM + packet->size);
ofpbuf_reserve(&copy, DP_NETDEV_HEADROOM);
ofpbuf_put(&copy, packet->data, packet->size);
} else {
/* We still need a shallow copy of 'packet', even though we won't
* modify its data, because flow_extract() modifies packet->l2, etc.
* We could probably get away with modifying those but it's more polite
* if we don't. */
copy = *packet;
}
flow_extract(&copy, 0, -1, &key);
error = dp_netdev_execute_actions(dp, &copy, &key, actions, actions_len);
if (mutates) {
ofpbuf_uninit(&copy);
}
return error;
}
static int
dpif_netdev_recv_get_mask(const struct dpif *dpif, int *listen_mask)
{
struct dpif_netdev *dpif_netdev = dpif_netdev_cast(dpif);
*listen_mask = dpif_netdev->listen_mask;
return 0;
}
static int
dpif_netdev_recv_set_mask(struct dpif *dpif, int listen_mask)
{
struct dpif_netdev *dpif_netdev = dpif_netdev_cast(dpif);
if (!(listen_mask & ~ODPL_ALL)) {
dpif_netdev->listen_mask = listen_mask;
return 0;
} else {
return EINVAL;
}
}
static int
find_nonempty_queue(struct dpif *dpif)
{
struct dpif_netdev *dpif_netdev = dpif_netdev_cast(dpif);
struct dp_netdev *dp = get_dp_netdev(dpif);
int mask = dpif_netdev->listen_mask;
int i;
for (i = 0; i < N_QUEUES; i++) {
struct list *queue = &dp->queues[i];
if (!list_is_empty(queue) && mask & (1u << i)) {
return i;
}
}
return -1;
}
static int
dpif_netdev_recv(struct dpif *dpif, struct ofpbuf **bufp)
{
int queue_idx = find_nonempty_queue(dpif);
if (queue_idx >= 0) {
struct dp_netdev *dp = get_dp_netdev(dpif);
*bufp = ofpbuf_from_list(list_pop_front(&dp->queues[queue_idx]));
dp->queue_len[queue_idx]--;
return 0;
} else {
return EAGAIN;
}
}
static void
dpif_netdev_recv_wait(struct dpif *dpif)
{
if (find_nonempty_queue(dpif) >= 0) {
poll_immediate_wake();
} else {
/* No messages ready to be received, and dp_wait() will ensure that we
* wake up to queue new messages, so there is nothing to do. */
}
}
static void
dp_netdev_flow_used(struct dp_netdev_flow *flow, struct flow *key,
const struct ofpbuf *packet)
{
time_timespec(&flow->used);
flow->packet_count++;
flow->byte_count += packet->size;
if (key->dl_type == htons(ETH_TYPE_IP) && key->nw_proto == IPPROTO_TCP) {
struct tcp_header *th = packet->l4;
flow->tcp_ctl |= th->tcp_ctl;
}
}
static void
dp_netdev_port_input(struct dp_netdev *dp, struct dp_netdev_port *port,
struct ofpbuf *packet)
{
struct dp_netdev_flow *flow;
struct flow key;
if (packet->size < ETH_HEADER_LEN) {
return;
}
if (flow_extract(packet, 0, port->port_no, &key) && dp->drop_frags) {
dp->n_frags++;
return;
}
flow = dp_netdev_lookup_flow(dp, &key);
if (flow) {
dp_netdev_flow_used(flow, &key, packet);
dp_netdev_execute_actions(dp, packet, &key,
flow->actions, flow->actions_len);
dp->n_hit++;
} else {
dp->n_missed++;
dp_netdev_output_control(dp, packet, _ODPL_MISS_NR, port->port_no, 0);
}
}
static void
dp_netdev_run(void)
{
struct shash_node *node;
struct ofpbuf packet;
ofpbuf_init(&packet, DP_NETDEV_HEADROOM + VLAN_ETH_HEADER_LEN + max_mtu);
SHASH_FOR_EACH (node, &dp_netdevs) {
struct dp_netdev *dp = node->data;
struct dp_netdev_port *port;
LIST_FOR_EACH (port, node, &dp->port_list) {
int error;
/* Reset packet contents. */
ofpbuf_clear(&packet);
ofpbuf_reserve(&packet, DP_NETDEV_HEADROOM);
error = netdev_recv(port->netdev, &packet);
if (!error) {
dp_netdev_port_input(dp, port, &packet);
} else if (error != EAGAIN && error != EOPNOTSUPP) {
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
VLOG_ERR_RL(&rl, "error receiving data from %s: %s",
netdev_get_name(port->netdev), strerror(error));
}
}
}
ofpbuf_uninit(&packet);
}
static void
dp_netdev_wait(void)
{
struct shash_node *node;
SHASH_FOR_EACH (node, &dp_netdevs) {
struct dp_netdev *dp = node->data;
struct dp_netdev_port *port;
LIST_FOR_EACH (port, node, &dp->port_list) {
netdev_recv_wait(port->netdev);
}
}
}
/* Modify the TCI field of 'packet'. If a VLAN tag is present, its TCI field
* is replaced by 'tci'. If a VLAN tag is not present, one is added with the
* TCI field set to 'tci'.
*/
static void
dp_netdev_set_dl_tci(struct ofpbuf *packet, uint16_t tci)
{
struct vlan_eth_header *veh;
struct eth_header *eh;
eh = packet->l2;
if (packet->size >= sizeof(struct vlan_eth_header)
&& eh->eth_type == htons(ETH_TYPE_VLAN)) {
veh = packet->l2;
veh->veth_tci = tci;
} else {
/* Insert new 802.1Q header. */
struct vlan_eth_header tmp;
memcpy(tmp.veth_dst, eh->eth_dst, ETH_ADDR_LEN);
memcpy(tmp.veth_src, eh->eth_src, ETH_ADDR_LEN);
tmp.veth_type = htons(ETH_TYPE_VLAN);
tmp.veth_tci = tci;
tmp.veth_next_type = eh->eth_type;
veh = ofpbuf_push_uninit(packet, VLAN_HEADER_LEN);
memcpy(veh, &tmp, sizeof tmp);
packet->l2 = (char*)packet->l2 - VLAN_HEADER_LEN;
}
}
static void
dp_netdev_strip_vlan(struct ofpbuf *packet)
{
struct vlan_eth_header *veh = packet->l2;
if (packet->size >= sizeof *veh
&& veh->veth_type == htons(ETH_TYPE_VLAN)) {
struct eth_header tmp;
memcpy(tmp.eth_dst, veh->veth_dst, ETH_ADDR_LEN);
memcpy(tmp.eth_src, veh->veth_src, ETH_ADDR_LEN);
tmp.eth_type = veh->veth_next_type;
ofpbuf_pull(packet, VLAN_HEADER_LEN);
packet->l2 = (char*)packet->l2 + VLAN_HEADER_LEN;
memcpy(packet->data, &tmp, sizeof tmp);
}
}
static void
dp_netdev_set_dl_src(struct ofpbuf *packet, const uint8_t dl_addr[ETH_ADDR_LEN])
{
struct eth_header *eh = packet->l2;
memcpy(eh->eth_src, dl_addr, sizeof eh->eth_src);
}
static void
dp_netdev_set_dl_dst(struct ofpbuf *packet, const uint8_t dl_addr[ETH_ADDR_LEN])
{
struct eth_header *eh = packet->l2;
memcpy(eh->eth_dst, dl_addr, sizeof eh->eth_dst);
}
static bool
is_ip(const struct ofpbuf *packet, const struct flow *key)
{
return key->dl_type == htons(ETH_TYPE_IP) && packet->l4;
}
static void
dp_netdev_set_nw_addr(struct ofpbuf *packet, const struct flow *key,
const struct nlattr *a)
{
if (is_ip(packet, key)) {
struct ip_header *nh = packet->l3;
ovs_be32 ip = nl_attr_get_be32(a);
uint16_t type = nl_attr_type(a);
uint32_t *field;
field = type == ODPAT_SET_NW_SRC ? &nh->ip_src : &nh->ip_dst;
if (key->nw_proto == IP_TYPE_TCP && packet->l7) {
struct tcp_header *th = packet->l4;
th->tcp_csum = recalc_csum32(th->tcp_csum, *field, ip);
} else if (key->nw_proto == IP_TYPE_UDP && packet->l7) {
struct udp_header *uh = packet->l4;
if (uh->udp_csum) {
uh->udp_csum = recalc_csum32(uh->udp_csum, *field, ip);
if (!uh->udp_csum) {
uh->udp_csum = 0xffff;
}
}
}
nh->ip_csum = recalc_csum32(nh->ip_csum, *field, ip);
*field = ip;
}
}
static void
dp_netdev_set_nw_tos(struct ofpbuf *packet, const struct flow *key,
uint8_t nw_tos)
{
if (is_ip(packet, key)) {
struct ip_header *nh = packet->l3;
uint8_t *field = &nh->ip_tos;
/* Set the DSCP bits and preserve the ECN bits. */
uint8_t new = nw_tos | (nh->ip_tos & IP_ECN_MASK);
nh->ip_csum = recalc_csum16(nh->ip_csum, htons((uint16_t)*field),
htons((uint16_t) new));
*field = new;
}
}
static void
dp_netdev_set_tp_port(struct ofpbuf *packet, const struct flow *key,
const struct nlattr *a)
{
if (is_ip(packet, key)) {
uint16_t type = nl_attr_type(a);
ovs_be16 port = nl_attr_get_be16(a);
uint16_t *field;
if (key->nw_proto == IPPROTO_TCP && packet->l7) {
struct tcp_header *th = packet->l4;
field = type == ODPAT_SET_TP_SRC ? &th->tcp_src : &th->tcp_dst;
th->tcp_csum = recalc_csum16(th->tcp_csum, *field, port);
*field = port;
} else if (key->nw_proto == IPPROTO_UDP && packet->l7) {
struct udp_header *uh = packet->l4;
field = type == ODPAT_SET_TP_SRC ? &uh->udp_src : &uh->udp_dst;
uh->udp_csum = recalc_csum16(uh->udp_csum, *field, port);
*field = port;
} else {
return;
}
}
}
static void
dp_netdev_output_port(struct dp_netdev *dp, struct ofpbuf *packet,
uint16_t out_port)
{
struct dp_netdev_port *p = dp->ports[out_port];
if (p) {
netdev_send(p->netdev, packet);
}
}
static int
dp_netdev_output_control(struct dp_netdev *dp, const struct ofpbuf *packet,
int queue_no, int port_no, uint64_t arg)
{
struct odp_msg *header;
struct ofpbuf *msg;
size_t msg_size;
if (dp->queue_len[queue_no] >= MAX_QUEUE_LEN) {
dp->n_lost++;
return ENOBUFS;
}
msg_size = sizeof *header + packet->size;
msg = ofpbuf_new_with_headroom(msg_size, DPIF_RECV_MSG_PADDING);
header = ofpbuf_put_uninit(msg, sizeof *header);
header->type = queue_no;
header->length = msg_size;
header->port = port_no;
header->arg = arg;
ofpbuf_put(msg, packet->data, packet->size);
list_push_back(&dp->queues[queue_no], &msg->list_node);
dp->queue_len[queue_no]++;
return 0;
}
/* Returns true if 'packet' is an invalid Ethernet+IPv4 ARP packet: one with
* screwy or truncated header fields or one whose inner and outer Ethernet
* address differ. */
static bool
dp_netdev_is_spoofed_arp(struct ofpbuf *packet, const struct flow *key)
{
struct arp_eth_header *arp;
struct eth_header *eth;
ptrdiff_t l3_size;
if (key->dl_type != htons(ETH_TYPE_ARP)) {
return false;
}
l3_size = (char *) ofpbuf_end(packet) - (char *) packet->l3;
if (l3_size < sizeof(struct arp_eth_header)) {
return true;
}
eth = packet->l2;
arp = packet->l3;
return (arp->ar_hrd != htons(ARP_HRD_ETHERNET)
|| arp->ar_pro != htons(ARP_PRO_IP)
|| arp->ar_hln != ETH_HEADER_LEN
|| arp->ar_pln != 4
|| !eth_addr_equals(arp->ar_sha, eth->eth_src));
}
static int
dp_netdev_execute_actions(struct dp_netdev *dp,
struct ofpbuf *packet, struct flow *key,
const struct nlattr *actions,
size_t actions_len)
{
const struct nlattr *a;
unsigned int left;
NL_ATTR_FOR_EACH_UNSAFE (a, left, actions, actions_len) {
switch (nl_attr_type(a)) {
case ODPAT_OUTPUT:
dp_netdev_output_port(dp, packet, nl_attr_get_u32(a));
break;
case ODPAT_CONTROLLER:
dp_netdev_output_control(dp, packet, _ODPL_ACTION_NR,
key->in_port, nl_attr_get_u64(a));
break;
case ODPAT_SET_DL_TCI:
dp_netdev_set_dl_tci(packet, nl_attr_get_be16(a));
break;
case ODPAT_STRIP_VLAN:
dp_netdev_strip_vlan(packet);
break;
case ODPAT_SET_DL_SRC:
dp_netdev_set_dl_src(packet, nl_attr_get_unspec(a, ETH_ADDR_LEN));
break;
case ODPAT_SET_DL_DST:
dp_netdev_set_dl_dst(packet, nl_attr_get_unspec(a, ETH_ADDR_LEN));
break;
case ODPAT_SET_NW_SRC:
case ODPAT_SET_NW_DST:
dp_netdev_set_nw_addr(packet, key, a);
break;
case ODPAT_SET_NW_TOS:
dp_netdev_set_nw_tos(packet, key, nl_attr_get_u8(a));
break;
case ODPAT_SET_TP_SRC:
case ODPAT_SET_TP_DST:
dp_netdev_set_tp_port(packet, key, a);
break;
case ODPAT_DROP_SPOOFED_ARP:
if (dp_netdev_is_spoofed_arp(packet, key)) {
return 0;
}
}
}
return 0;
}
const struct dpif_class dpif_netdev_class = {
"netdev",
dp_netdev_run,
dp_netdev_wait,
NULL, /* enumerate */
dpif_netdev_open,
dpif_netdev_close,
NULL, /* get_all_names */
dpif_netdev_destroy,
dpif_netdev_get_stats,
dpif_netdev_get_drop_frags,
dpif_netdev_set_drop_frags,
dpif_netdev_port_add,
dpif_netdev_port_del,
dpif_netdev_port_query_by_number,
dpif_netdev_port_query_by_name,
dpif_netdev_port_list,
dpif_netdev_port_poll,
dpif_netdev_port_poll_wait,
dpif_netdev_flow_get,
dpif_netdev_flow_put,
dpif_netdev_flow_del,
dpif_netdev_flow_flush,
dpif_netdev_flow_list,
dpif_netdev_execute,
dpif_netdev_recv_get_mask,
dpif_netdev_recv_set_mask,
NULL, /* get_sflow_probability */
NULL, /* set_sflow_probability */
NULL, /* queue_to_priority */
dpif_netdev_recv,
dpif_netdev_recv_wait,
};
void
dpif_dummy_register(void)
{
if (!dpif_dummy_class.type) {
dpif_dummy_class = dpif_netdev_class;
dpif_dummy_class.type = "dummy";
dp_register_provider(&dpif_dummy_class);
}
}
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