mir/ovs
2
0
Fork 0
mirror of https://github.com/openvswitch/ovs synced 2025-08-23 02:17:42 +00:00
Code Issues Releases Wiki Activity
ovs/lib/netdev-linux.c
Ben Pfaff 8e46022197 netdev-linux: Factor out removing policing. 
This is duplicated code that the following commit will rewrite.
2010-05-05 14:00:50 -07:00

2159 lines
64 KiB
C
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/*
* Copyright (c) 2009, 2010 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 <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <arpa/inet.h>
#include <inttypes.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/types.h>
#include <linux/ethtool.h>
#include <linux/rtnetlink.h>
#include <linux/sockios.h>
#include <linux/version.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netpacket/packet.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <linux/if_tunnel.h>
#include <net/if_arp.h>
#include <net/if_packet.h>
#include <net/route.h>
#include <netinet/in.h>
#include <poll.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "coverage.h"
#include "dynamic-string.h"
#include "fatal-signal.h"
#include "netdev-provider.h"
#include "netlink.h"
#include "ofpbuf.h"
#include "openflow/openflow.h"
#include "openvswitch/internal_dev.h"
#include "openvswitch/gre.h"
#include "packets.h"
#include "poll-loop.h"
#include "rtnetlink.h"
#include "socket-util.h"
#include "shash.h"
#include "svec.h"
#define THIS_MODULE VLM_netdev_linux
#include "vlog.h"
/* These were introduced in Linux 2.6.14, so they might be missing if we have
* old headers. */
#ifndef ADVERTISED_Pause
#define ADVERTISED_Pause (1 << 13)
#endif
#ifndef ADVERTISED_Asym_Pause
#define ADVERTISED_Asym_Pause (1 << 14)
#endif
static struct rtnetlink_notifier netdev_linux_cache_notifier;
static int cache_notifier_refcount;
enum {
VALID_IFINDEX = 1 << 0,
VALID_ETHERADDR = 1 << 1,
VALID_IN4 = 1 << 2,
VALID_IN6 = 1 << 3,
VALID_MTU = 1 << 4,
VALID_CARRIER = 1 << 5,
VALID_IS_PSEUDO = 1 << 6 /* Represents is_internal and is_tap. */
};
struct tap_state {
int fd;
};
struct patch_state {
char *peer;
};
struct netdev_dev_linux {
struct netdev_dev netdev_dev;
struct shash_node *shash_node;
unsigned int cache_valid;
/* The following are figured out "on demand" only. They are only valid
* when the corresponding VALID_* bit in 'cache_valid' is set. */
int ifindex;
uint8_t etheraddr[ETH_ADDR_LEN];
struct in_addr address, netmask;
struct in6_addr in6;
int mtu;
int carrier;
bool is_internal; /* Is this an openvswitch internal device? */
bool is_tap; /* Is this a tuntap device? */
union {
struct tap_state tap;
struct patch_state patch;
} state;
};
struct netdev_linux {
struct netdev netdev;
int fd;
};
/* An AF_INET socket (used for ioctl operations). */
static int af_inet_sock = -1;
struct netdev_linux_notifier {
struct netdev_notifier notifier;
struct list node;
};
static struct shash netdev_linux_notifiers =
SHASH_INITIALIZER(&netdev_linux_notifiers);
static struct rtnetlink_notifier netdev_linux_poll_notifier;
/* This is set pretty low because we probably won't learn anything from the
* additional log messages. */
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
static int netdev_linux_init(void);
static int netdev_linux_do_ethtool(const char *name, struct ethtool_cmd *,
int cmd, const char *cmd_name);
static int netdev_linux_do_ioctl(const char *name, struct ifreq *, int cmd,
const char *cmd_name);
static int netdev_linux_get_ipv4(const struct netdev *, struct in_addr *,
int cmd, const char *cmd_name);
static int get_flags(const struct netdev *, int *flagsp);
static int set_flags(struct netdev *, int flags);
static int do_get_ifindex(const char *netdev_name);
static int get_ifindex(const struct netdev *, int *ifindexp);
static int do_set_addr(struct netdev *netdev,
int ioctl_nr, const char *ioctl_name,
struct in_addr addr);
static int get_etheraddr(const char *netdev_name, uint8_t ea[ETH_ADDR_LEN]);
static int set_etheraddr(const char *netdev_name, int hwaddr_family,
const uint8_t[ETH_ADDR_LEN]);
static int get_stats_via_netlink(int ifindex, struct netdev_stats *stats);
static int get_stats_via_proc(const char *netdev_name, struct netdev_stats *stats);
static int get_rtnl_sock(struct nl_sock **);
static bool
is_netdev_linux_class(const struct netdev_class *netdev_class)
{
return netdev_class->init == netdev_linux_init;
}
static struct netdev_dev_linux *
netdev_dev_linux_cast(const struct netdev_dev *netdev_dev)
{
const struct netdev_class *netdev_class = netdev_dev_get_class(netdev_dev);
assert(is_netdev_linux_class(netdev_class));
return CONTAINER_OF(netdev_dev, struct netdev_dev_linux, netdev_dev);
}
static struct netdev_linux *
netdev_linux_cast(const struct netdev *netdev)
{
struct netdev_dev *netdev_dev = netdev_get_dev(netdev);
const struct netdev_class *netdev_class = netdev_dev_get_class(netdev_dev);
assert(is_netdev_linux_class(netdev_class));
return CONTAINER_OF(netdev, struct netdev_linux, netdev);
}
static int
netdev_linux_init(void)
{
static int status = -1;
if (status < 0) {
af_inet_sock = socket(AF_INET, SOCK_DGRAM, 0);
status = af_inet_sock >= 0 ? 0 : errno;
if (status) {
VLOG_ERR("failed to create inet socket: %s", strerror(status));
}
}
return status;
}
static void
netdev_linux_run(void)
{
rtnetlink_notifier_run();
}
static void
netdev_linux_wait(void)
{
rtnetlink_notifier_wait();
}
static void
netdev_linux_cache_cb(const struct rtnetlink_change *change,
void *aux OVS_UNUSED)
{
struct netdev_dev_linux *dev;
if (change) {
struct netdev_dev *base_dev = netdev_dev_from_name(change->ifname);
if (base_dev) {
const struct netdev_class *netdev_class =
netdev_dev_get_class(base_dev);
if (is_netdev_linux_class(netdev_class)) {
dev = netdev_dev_linux_cast(base_dev);
dev->cache_valid = 0;
}
}
} else {
struct shash device_shash;
struct shash_node *node;
shash_init(&device_shash);
netdev_dev_get_devices(&netdev_linux_class, &device_shash);
SHASH_FOR_EACH (node, &device_shash) {
dev = node->data;
dev->cache_valid = 0;
}
shash_destroy(&device_shash);
}
}
static int
if_up(const char *name)
{
struct ifreq ifr;
strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
ifr.ifr_flags = IFF_UP;
if (ioctl(af_inet_sock, SIOCSIFFLAGS, &ifr) == -1) {
VLOG_DBG_RL(&rl, "%s: failed to bring device up: %s",
name, strerror(errno));
return errno;
}
return 0;
}
/* A veth may be created using the 'command' "+<name>,<peer>". A veth may
* be destroyed by using the 'command' "-<name>", where <name> can be
* either side of the device.
*/
static int
modify_veth(const char *format, ...)
{
FILE *veth_file;
va_list args;
int retval;
veth_file = fopen("/sys/class/net/veth_pairs", "w");
if (!veth_file) {
VLOG_WARN_RL(&rl, "could not open veth device. Are you running a "
"supported XenServer with the kernel module loaded?");
return ENODEV;
}
setvbuf(veth_file, NULL, _IONBF, 0);
va_start(args, format);
retval = vfprintf(veth_file, format, args);
va_end(args);
fclose(veth_file);
if (retval < 0) {
VLOG_WARN_RL(&rl, "could not destroy patch: %s", strerror(errno));
return errno;
}
return 0;
}
static int
create_patch(const char *name, const char *peer)
{
int retval;
struct netdev_dev *peer_nd;
/* Only create the veth if the peer didn't already do it. */
peer_nd = netdev_dev_from_name(peer);
if (peer_nd) {
if (!strcmp("patch", netdev_dev_get_type(peer_nd))) {
struct netdev_dev_linux *ndl = netdev_dev_linux_cast(peer_nd);
if (!strcmp(name, ndl->state.patch.peer)) {
return 0;
} else {
VLOG_WARN_RL(&rl, "peer '%s' already paired with '%s'",
peer, ndl->state.patch.peer);
return EINVAL;
}
} else {
VLOG_WARN_RL(&rl, "peer '%s' exists and is not a patch", peer);
return EINVAL;
}
}
retval = modify_veth("+%s,%s", name, peer);
if (retval) {
return retval;
}
retval = if_up(name);
if (retval) {
return retval;
}
retval = if_up(peer);
if (retval) {
return retval;
}
return 0;
}
static int
setup_patch(const char *name, const struct shash *args, char **peer_)
{
const char *peer;
peer = shash_find_data(args, "peer");
if (!peer) {
VLOG_WARN("patch type requires valid 'peer' argument");
return EINVAL;
}
if (shash_count(args) > 1) {
VLOG_WARN("patch type takes only a 'peer' argument");
return EINVAL;
}
if (strlen(peer) >= IFNAMSIZ) {
VLOG_WARN_RL(&rl, "patch 'peer' arg too long");
return EINVAL;
}
*peer_ = xstrdup(peer);
return create_patch(name, peer);
}
/* Creates the netdev device of 'type' with 'name'. */
static int
netdev_linux_create_system(const char *name, const char *type OVS_UNUSED,
const struct shash *args, struct netdev_dev **netdev_devp)
{
struct netdev_dev_linux *netdev_dev;
int error;
if (!shash_is_empty(args)) {
VLOG_WARN("%s: arguments for system devices should be empty", name);
}
if (!cache_notifier_refcount) {
error = rtnetlink_notifier_register(&netdev_linux_cache_notifier,
netdev_linux_cache_cb, NULL);
if (error) {
return error;
}
}
cache_notifier_refcount++;
netdev_dev = xzalloc(sizeof *netdev_dev);
netdev_dev_init(&netdev_dev->netdev_dev, name, &netdev_linux_class);
*netdev_devp = &netdev_dev->netdev_dev;
return 0;
}
/* For most types of netdevs we open the device for each call of
* netdev_open(). However, this is not the case with tap devices,
* since it is only possible to open the device once. In this
* situation we share a single file descriptor, and consequently
* buffers, across all readers. Therefore once data is read it will
* be unavailable to other reads for tap devices. */
static int
netdev_linux_create_tap(const char *name, const char *type OVS_UNUSED,
const struct shash *args, struct netdev_dev **netdev_devp)
{
struct netdev_dev_linux *netdev_dev;
struct tap_state *state;
static const char tap_dev[] = "/dev/net/tun";
struct ifreq ifr;
int error;
if (!shash_is_empty(args)) {
VLOG_WARN("%s: arguments for TAP devices should be empty", name);
}
netdev_dev = xzalloc(sizeof *netdev_dev);
state = &netdev_dev->state.tap;
/* Open tap device. */
state->fd = open(tap_dev, O_RDWR);
if (state->fd < 0) {
error = errno;
VLOG_WARN("opening \"%s\" failed: %s", tap_dev, strerror(error));
goto error;
}
/* Create tap device. */
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
if (ioctl(state->fd, TUNSETIFF, &ifr) == -1) {
VLOG_WARN("%s: creating tap device failed: %s", name,
strerror(errno));
error = errno;
goto error;
}
/* Make non-blocking. */
error = set_nonblocking(state->fd);
if (error) {
goto error;
}
netdev_dev_init(&netdev_dev->netdev_dev, name, &netdev_tap_class);
*netdev_devp = &netdev_dev->netdev_dev;
return 0;
error:
free(netdev_dev);
return error;
}
static int
netdev_linux_create_patch(const char *name, const char *type OVS_UNUSED,
const struct shash *args, struct netdev_dev **netdev_devp)
{
struct netdev_dev_linux *netdev_dev;
char *peer = NULL;
int error;
error = setup_patch(name, args, &peer);
if (error) {
free(peer);
return error;
}
netdev_dev = xzalloc(sizeof *netdev_dev);
netdev_dev->state.patch.peer = peer;
netdev_dev_init(&netdev_dev->netdev_dev, name, &netdev_patch_class);
*netdev_devp = &netdev_dev->netdev_dev;
return 0;
}
static void
destroy_tap(struct netdev_dev_linux *netdev_dev)
{
struct tap_state *state = &netdev_dev->state.tap;
if (state->fd >= 0) {
close(state->fd);
}
}
static void
destroy_patch(struct netdev_dev_linux *netdev_dev)
{
const char *name = netdev_dev_get_name(&netdev_dev->netdev_dev);
struct patch_state *state = &netdev_dev->state.patch;
/* Only destroy veth if 'peer' doesn't exist as an existing netdev. */
if (!netdev_dev_from_name(state->peer)) {
modify_veth("-%s", name);
}
free(state->peer);
}
/* Destroys the netdev device 'netdev_dev_'. */
static void
netdev_linux_destroy(struct netdev_dev *netdev_dev_)
{
struct netdev_dev_linux *netdev_dev = netdev_dev_linux_cast(netdev_dev_);
const char *type = netdev_dev_get_type(netdev_dev_);
if (!strcmp(type, "system")) {
cache_notifier_refcount--;
if (!cache_notifier_refcount) {
rtnetlink_notifier_unregister(&netdev_linux_cache_notifier);
}
} else if (!strcmp(type, "tap")) {
destroy_tap(netdev_dev);
} else if (!strcmp(type, "patch")) {
destroy_patch(netdev_dev);
}
free(netdev_dev);
}
static int
netdev_linux_open(struct netdev_dev *netdev_dev_, int ethertype,
struct netdev **netdevp)
{
struct netdev_dev_linux *netdev_dev = netdev_dev_linux_cast(netdev_dev_);
struct netdev_linux *netdev;
enum netdev_flags flags;
int error;
/* Allocate network device. */
netdev = xzalloc(sizeof *netdev);
netdev->fd = -1;
netdev_init(&netdev->netdev, netdev_dev_);
error = netdev_get_flags(&netdev->netdev, &flags);
if (error == ENODEV) {
goto error;
}
if (!strcmp(netdev_dev_get_type(netdev_dev_), "tap")) {
netdev->fd = netdev_dev->state.tap.fd;
} else if (ethertype != NETDEV_ETH_TYPE_NONE) {
struct sockaddr_ll sll;
int protocol;
int ifindex;
/* Create file descriptor. */
protocol = (ethertype == NETDEV_ETH_TYPE_ANY ? ETH_P_ALL
: ethertype == NETDEV_ETH_TYPE_802_2 ? ETH_P_802_2
: ethertype);
netdev->fd = socket(PF_PACKET, SOCK_RAW, htons(protocol));
if (netdev->fd < 0) {
error = errno;
goto error;
}
/* Set non-blocking mode. */
error = set_nonblocking(netdev->fd);
if (error) {
goto error;
}
/* Get ethernet device index. */
error = get_ifindex(&netdev->netdev, &ifindex);
if (error) {
goto error;
}
/* Bind to specific ethernet device. */
memset(&sll, 0, sizeof sll);
sll.sll_family = AF_PACKET;
sll.sll_ifindex = ifindex;
if (bind(netdev->fd,
(struct sockaddr *) &sll, sizeof sll) < 0) {
error = errno;
VLOG_ERR("bind to %s failed: %s", netdev_dev_get_name(netdev_dev_),
strerror(error));
goto error;
}
/* Between the socket() and bind() calls above, the socket receives all
* packets of the requested type on all system interfaces. We do not
* want to receive that data, but there is no way to avoid it. So we
* must now drain out the receive queue. */
error = drain_rcvbuf(netdev->fd);
if (error) {
goto error;
}
}
*netdevp = &netdev->netdev;
return 0;
error:
netdev_uninit(&netdev->netdev, true);
return error;
}
/* Closes and destroys 'netdev'. */
static void
netdev_linux_close(struct netdev *netdev_)
{
struct netdev_linux *netdev = netdev_linux_cast(netdev_);
if (netdev->fd > 0 && strcmp(netdev_get_type(netdev_), "tap")) {
close(netdev->fd);
}
free(netdev);
}
/* Initializes 'svec' with a list of the names of all known network devices. */
static int
netdev_linux_enumerate(struct svec *svec)
{
struct if_nameindex *names;
names = if_nameindex();
if (names) {
size_t i;
for (i = 0; names[i].if_name != NULL; i++) {
svec_add(svec, names[i].if_name);
}
if_freenameindex(names);
return 0;
} else {
VLOG_WARN("could not obtain list of network device names: %s",
strerror(errno));
return errno;
}
}
static int
netdev_linux_recv(struct netdev *netdev_, void *data, size_t size)
{
struct netdev_linux *netdev = netdev_linux_cast(netdev_);
if (netdev->fd < 0) {
/* Device was opened with NETDEV_ETH_TYPE_NONE. */
return -EAGAIN;
}
for (;;) {
ssize_t retval = read(netdev->fd, data, size);
if (retval >= 0) {
return retval;
} else if (errno != EINTR) {
if (errno != EAGAIN) {
VLOG_WARN_RL(&rl, "error receiving Ethernet packet on %s: %s",
strerror(errno), netdev_get_name(netdev_));
}
return -errno;
}
}
}
/* Registers with the poll loop to wake up from the next call to poll_block()
* when a packet is ready to be received with netdev_recv() on 'netdev'. */
static void
netdev_linux_recv_wait(struct netdev *netdev_)
{
struct netdev_linux *netdev = netdev_linux_cast(netdev_);
if (netdev->fd >= 0) {
poll_fd_wait(netdev->fd, POLLIN);
}
}
/* Discards all packets waiting to be received from 'netdev'. */
static int
netdev_linux_drain(struct netdev *netdev_)
{
struct netdev_linux *netdev = netdev_linux_cast(netdev_);
if (netdev->fd < 0) {
return 0;
} else if (!strcmp(netdev_get_type(netdev_), "tap")) {
struct ifreq ifr;
int error = netdev_linux_do_ioctl(netdev_get_name(netdev_), &ifr,
SIOCGIFTXQLEN, "SIOCGIFTXQLEN");
if (error) {
return error;
}
drain_fd(netdev->fd, ifr.ifr_qlen);
return 0;
} else {
return drain_rcvbuf(netdev->fd);
}
}
/* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
* errno value. Returns EAGAIN without blocking if the packet cannot be queued
* immediately. Returns EMSGSIZE if a partial packet was transmitted or if
* the packet is too big or too small to transmit on the device.
*
* The caller retains ownership of 'buffer' in all cases.
*
* The kernel maintains a packet transmission queue, so the caller is not
* expected to do additional queuing of packets. */
static int
netdev_linux_send(struct netdev *netdev_, const void *data, size_t size)
{
struct netdev_linux *netdev = netdev_linux_cast(netdev_);
/* XXX should support sending even if 'ethertype' was NETDEV_ETH_TYPE_NONE.
*/
if (netdev->fd < 0) {
return EPIPE;
}
for (;;) {
ssize_t retval = write(netdev->fd, data, size);
if (retval < 0) {
/* The Linux AF_PACKET implementation never blocks waiting for room
* for packets, instead returning ENOBUFS. Translate this into
* EAGAIN for the caller. */
if (errno == ENOBUFS) {
return EAGAIN;
} else if (errno == EINTR) {
continue;
} else if (errno != EAGAIN) {
VLOG_WARN_RL(&rl, "error sending Ethernet packet on %s: %s",
netdev_get_name(netdev_), strerror(errno));
}
return errno;
} else if (retval != size) {
VLOG_WARN_RL(&rl, "sent partial Ethernet packet (%zd bytes of "
"%zu) on %s", retval, size, netdev_get_name(netdev_));
return EMSGSIZE;
} else {
return 0;
}
}
}
/* Registers with the poll loop to wake up from the next call to poll_block()
* when the packet transmission queue has sufficient room to transmit a packet
* with netdev_send().
*
* The kernel maintains a packet transmission queue, so the client is not
* expected to do additional queuing of packets. Thus, this function is
* unlikely to ever be used. It is included for completeness. */
static void
netdev_linux_send_wait(struct netdev *netdev_)
{
struct netdev_linux *netdev = netdev_linux_cast(netdev_);
if (netdev->fd < 0) {
/* Nothing to do. */
} else if (strcmp(netdev_get_type(netdev_), "tap")) {
poll_fd_wait(netdev->fd, POLLOUT);
} else {
/* TAP device always accepts packets.*/
poll_immediate_wake();
}
}
/* Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful,
* otherwise a positive errno value. */
static int
netdev_linux_set_etheraddr(struct netdev *netdev_,
const uint8_t mac[ETH_ADDR_LEN])
{
struct netdev_dev_linux *netdev_dev =
netdev_dev_linux_cast(netdev_get_dev(netdev_));
int error;
if (!(netdev_dev->cache_valid & VALID_ETHERADDR)
|| !eth_addr_equals(netdev_dev->etheraddr, mac)) {
error = set_etheraddr(netdev_get_name(netdev_), ARPHRD_ETHER, mac);
if (!error) {
netdev_dev->cache_valid |= VALID_ETHERADDR;
memcpy(netdev_dev->etheraddr, mac, ETH_ADDR_LEN);
}
} else {
error = 0;
}
return error;
}
/* Returns a pointer to 'netdev''s MAC address. The caller must not modify or
* free the returned buffer. */
static int
netdev_linux_get_etheraddr(const struct netdev *netdev_,
uint8_t mac[ETH_ADDR_LEN])
{
struct netdev_dev_linux *netdev_dev =
netdev_dev_linux_cast(netdev_get_dev(netdev_));
if (!(netdev_dev->cache_valid & VALID_ETHERADDR)) {
int error = get_etheraddr(netdev_get_name(netdev_),
netdev_dev->etheraddr);
if (error) {
return error;
}
netdev_dev->cache_valid |= VALID_ETHERADDR;
}
memcpy(mac, netdev_dev->etheraddr, ETH_ADDR_LEN);
return 0;
}
/* Returns the maximum size of transmitted (and received) packets on 'netdev',
* in bytes, not including the hardware header; thus, this is typically 1500
* bytes for Ethernet devices. */
static int
netdev_linux_get_mtu(const struct netdev *netdev_, int *mtup)
{
struct netdev_dev_linux *netdev_dev =
netdev_dev_linux_cast(netdev_get_dev(netdev_));
if (!(netdev_dev->cache_valid & VALID_MTU)) {
struct ifreq ifr;
int error;
error = netdev_linux_do_ioctl(netdev_get_name(netdev_), &ifr,
SIOCGIFMTU, "SIOCGIFMTU");
if (error) {
return error;
}
netdev_dev->mtu = ifr.ifr_mtu;
netdev_dev->cache_valid |= VALID_MTU;
}
*mtup = netdev_dev->mtu;
return 0;
}
/* Returns the ifindex of 'netdev', if successful, as a positive number.
* On failure, returns a negative errno value. */
static int
netdev_linux_get_ifindex(const struct netdev *netdev)
{
int ifindex, error;
error = get_ifindex(netdev, &ifindex);
return error ? -error : ifindex;
}
static int
netdev_linux_get_carrier(const struct netdev *netdev_, bool *carrier)
{
struct netdev_dev_linux *netdev_dev =
netdev_dev_linux_cast(netdev_get_dev(netdev_));
int error = 0;
char *fn = NULL;
int fd = -1;
if (!(netdev_dev->cache_valid & VALID_CARRIER)) {
char line[8];
int retval;
fn = xasprintf("/sys/class/net/%s/carrier",
netdev_get_name(netdev_));
fd = open(fn, O_RDONLY);
if (fd < 0) {
error = errno;
VLOG_WARN_RL(&rl, "%s: open failed: %s", fn, strerror(error));
goto exit;
}
retval = read(fd, line, sizeof line);
if (retval < 0) {
error = errno;
if (error == EINVAL) {
/* This is the normal return value when we try to check carrier
* if the network device is not up. */
} else {
VLOG_WARN_RL(&rl, "%s: read failed: %s", fn, strerror(error));
}
goto exit;
} else if (retval == 0) {
error = EPROTO;
VLOG_WARN_RL(&rl, "%s: unexpected end of file", fn);
goto exit;
}
if (line[0] != '0' && line[0] != '1') {
error = EPROTO;
VLOG_WARN_RL(&rl, "%s: value is %c (expected 0 or 1)",
fn, line[0]);
goto exit;
}
netdev_dev->carrier = line[0] != '0';
netdev_dev->cache_valid |= VALID_CARRIER;
}
*carrier = netdev_dev->carrier;
error = 0;
exit:
if (fd >= 0) {
close(fd);
}
free(fn);
return error;
}
/* Check whether we can we use RTM_GETLINK to get network device statistics.
* In pre-2.6.19 kernels, this was only available if wireless extensions were
* enabled. */
static bool
check_for_working_netlink_stats(void)
{
/* Decide on the netdev_get_stats() implementation to use. Netlink is
* preferable, so if that works, we'll use it. */
int ifindex = do_get_ifindex("lo");
if (ifindex < 0) {
VLOG_WARN("failed to get ifindex for lo, "
"obtaining netdev stats from proc");
return false;
} else {
struct netdev_stats stats;
int error = get_stats_via_netlink(ifindex, &stats);
if (!error) {
VLOG_DBG("obtaining netdev stats via rtnetlink");
return true;
} else {
VLOG_INFO("RTM_GETLINK failed (%s), obtaining netdev stats "
"via proc (you are probably running a pre-2.6.19 "
"kernel)", strerror(error));
return false;
}
}
}
/* Brings the 'is_internal' and 'is_tap' members of 'netdev_dev' up-to-date. */
static void
netdev_linux_update_is_pseudo(struct netdev_dev_linux *netdev_dev)
{
if (!(netdev_dev->cache_valid & VALID_IS_PSEUDO)) {
const char *name = netdev_dev_get_name(&netdev_dev->netdev_dev);
const char *type = netdev_dev_get_type(&netdev_dev->netdev_dev);
netdev_dev->is_tap = !strcmp(type, "tap");
netdev_dev->is_internal = false;
if (!netdev_dev->is_tap) {
struct ethtool_drvinfo drvinfo;
int error;
memset(&drvinfo, 0, sizeof drvinfo);
error = netdev_linux_do_ethtool(name,
(struct ethtool_cmd *)&drvinfo,
ETHTOOL_GDRVINFO,
"ETHTOOL_GDRVINFO");
if (!error && !strcmp(drvinfo.driver, "openvswitch")) {
netdev_dev->is_internal = true;
}
}
netdev_dev->cache_valid |= VALID_IS_PSEUDO;
}
}
/* Retrieves current device stats for 'netdev'.
*
* XXX All of the members of struct netdev_stats are 64 bits wide, but on
* 32-bit architectures the Linux network stats are only 32 bits. */
static int
netdev_linux_get_stats(const struct netdev *netdev_,
struct netdev_stats *stats)
{
struct netdev_dev_linux *netdev_dev =
netdev_dev_linux_cast(netdev_get_dev(netdev_));
static int use_netlink_stats = -1;
int error;
struct netdev_stats raw_stats;
struct netdev_stats *collect_stats = stats;
COVERAGE_INC(netdev_get_stats);
netdev_linux_update_is_pseudo(netdev_dev);
if (netdev_dev->is_internal) {
collect_stats = &raw_stats;
}
if (use_netlink_stats < 0) {
use_netlink_stats = check_for_working_netlink_stats();
}
if (use_netlink_stats) {
int ifindex;
error = get_ifindex(netdev_, &ifindex);
if (!error) {
error = get_stats_via_netlink(ifindex, collect_stats);
}
} else {
error = get_stats_via_proc(netdev_get_name(netdev_), collect_stats);
}
/* If this port is an internal port then the transmit and receive stats
* will appear to be swapped relative to the other ports since we are the
* one sending the data, not a remote computer. For consistency, we swap
* them back here. */
if (!error && (netdev_dev->is_internal || netdev_dev->is_tap)) {
stats->rx_packets = raw_stats.tx_packets;
stats->tx_packets = raw_stats.rx_packets;
stats->rx_bytes = raw_stats.tx_bytes;
stats->tx_bytes = raw_stats.rx_bytes;
stats->rx_errors = raw_stats.tx_errors;
stats->tx_errors = raw_stats.rx_errors;
stats->rx_dropped = raw_stats.tx_dropped;
stats->tx_dropped = raw_stats.rx_dropped;
stats->multicast = raw_stats.multicast;
stats->collisions = raw_stats.collisions;
stats->rx_length_errors = 0;
stats->rx_over_errors = 0;
stats->rx_crc_errors = 0;
stats->rx_frame_errors = 0;
stats->rx_fifo_errors = 0;
stats->rx_missed_errors = 0;
stats->tx_aborted_errors = 0;
stats->tx_carrier_errors = 0;
stats->tx_fifo_errors = 0;
stats->tx_heartbeat_errors = 0;
stats->tx_window_errors = 0;
}
return error;
}
static int
netdev_linux_set_stats(struct netdev *netdev,
const struct netdev_stats *stats)
{
struct netdev_dev_linux *netdev_dev =
netdev_dev_linux_cast(netdev_get_dev(netdev));
struct internal_dev_stats dp_dev_stats;
struct ifreq ifr;
/* We must reject this call if 'netdev' is not an Open vSwitch internal
* port, because the ioctl that we are about to execute is in the "device
* private ioctls" range, which means that executing it on a device that
* is not the type we expect could do any random thing.
*
* (Amusingly, these ioctl numbers are commented "THESE IOCTLS ARE
* _DEPRECATED_ AND WILL DISAPPEAR IN 2.5.X" in linux/sockios.h. I guess
* DaveM is a little behind on that.) */
netdev_linux_update_is_pseudo(netdev_dev);
if (!netdev_dev->is_internal) {
return EOPNOTSUPP;
}
/* This actually only sets the *offset* that the dp_dev applies, but in our
* usage for fake bond devices the dp_dev never has any traffic of it own
* so it has the same effect. */
dp_dev_stats.rx_packets = stats->rx_packets;
dp_dev_stats.rx_bytes = stats->rx_bytes;
dp_dev_stats.tx_packets = stats->tx_packets;
dp_dev_stats.tx_bytes = stats->tx_bytes;
ifr.ifr_data = (void *) &dp_dev_stats;
return netdev_linux_do_ioctl(netdev_get_name(netdev), &ifr,
INTERNAL_DEV_SET_STATS,
"INTERNAL_DEV_SET_STATS");
}
/* Stores the features supported by 'netdev' into each of '*current',
* '*advertised', '*supported', and '*peer' that are non-null. Each value is a
* bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if
* successful, otherwise a positive errno value. */
static int
netdev_linux_get_features(struct netdev *netdev,
uint32_t *current, uint32_t *advertised,
uint32_t *supported, uint32_t *peer)
{
struct ethtool_cmd ecmd;
int error;
memset(&ecmd, 0, sizeof ecmd);
error = netdev_linux_do_ethtool(netdev_get_name(netdev), &ecmd,
ETHTOOL_GSET, "ETHTOOL_GSET");
if (error) {
return error;
}
/* Supported features. */
*supported = 0;
if (ecmd.supported & SUPPORTED_10baseT_Half) {
*supported |= OFPPF_10MB_HD;
}
if (ecmd.supported & SUPPORTED_10baseT_Full) {
*supported |= OFPPF_10MB_FD;
}
if (ecmd.supported & SUPPORTED_100baseT_Half) {
*supported |= OFPPF_100MB_HD;
}
if (ecmd.supported & SUPPORTED_100baseT_Full) {
*supported |= OFPPF_100MB_FD;
}
if (ecmd.supported & SUPPORTED_1000baseT_Half) {
*supported |= OFPPF_1GB_HD;
}
if (ecmd.supported & SUPPORTED_1000baseT_Full) {
*supported |= OFPPF_1GB_FD;
}
if (ecmd.supported & SUPPORTED_10000baseT_Full) {
*supported |= OFPPF_10GB_FD;
}
if (ecmd.supported & SUPPORTED_TP) {
*supported |= OFPPF_COPPER;
}
if (ecmd.supported & SUPPORTED_FIBRE) {
*supported |= OFPPF_FIBER;
}
if (ecmd.supported & SUPPORTED_Autoneg) {
*supported |= OFPPF_AUTONEG;
}
if (ecmd.supported & SUPPORTED_Pause) {
*supported |= OFPPF_PAUSE;
}
if (ecmd.supported & SUPPORTED_Asym_Pause) {
*supported |= OFPPF_PAUSE_ASYM;
}
/* Advertised features. */
*advertised = 0;
if (ecmd.advertising & ADVERTISED_10baseT_Half) {
*advertised |= OFPPF_10MB_HD;
}
if (ecmd.advertising & ADVERTISED_10baseT_Full) {
*advertised |= OFPPF_10MB_FD;
}
if (ecmd.advertising & ADVERTISED_100baseT_Half) {
*advertised |= OFPPF_100MB_HD;
}
if (ecmd.advertising & ADVERTISED_100baseT_Full) {
*advertised |= OFPPF_100MB_FD;
}
if (ecmd.advertising & ADVERTISED_1000baseT_Half) {
*advertised |= OFPPF_1GB_HD;
}
if (ecmd.advertising & ADVERTISED_1000baseT_Full) {
*advertised |= OFPPF_1GB_FD;
}
if (ecmd.advertising & ADVERTISED_10000baseT_Full) {
*advertised |= OFPPF_10GB_FD;
}
if (ecmd.advertising & ADVERTISED_TP) {
*advertised |= OFPPF_COPPER;
}
if (ecmd.advertising & ADVERTISED_FIBRE) {
*advertised |= OFPPF_FIBER;
}
if (ecmd.advertising & ADVERTISED_Autoneg) {
*advertised |= OFPPF_AUTONEG;
}
if (ecmd.advertising & ADVERTISED_Pause) {
*advertised |= OFPPF_PAUSE;
}
if (ecmd.advertising & ADVERTISED_Asym_Pause) {
*advertised |= OFPPF_PAUSE_ASYM;
}
/* Current settings. */
if (ecmd.speed == SPEED_10) {
*current = ecmd.duplex ? OFPPF_10MB_FD : OFPPF_10MB_HD;
} else if (ecmd.speed == SPEED_100) {
*current = ecmd.duplex ? OFPPF_100MB_FD : OFPPF_100MB_HD;
} else if (ecmd.speed == SPEED_1000) {
*current = ecmd.duplex ? OFPPF_1GB_FD : OFPPF_1GB_HD;
} else if (ecmd.speed == SPEED_10000) {
*current = OFPPF_10GB_FD;
} else {
*current = 0;
}
if (ecmd.port == PORT_TP) {
*current |= OFPPF_COPPER;
} else if (ecmd.port == PORT_FIBRE) {
*current |= OFPPF_FIBER;
}
if (ecmd.autoneg) {
*current |= OFPPF_AUTONEG;
}
/* Peer advertisements. */
*peer = 0; /* XXX */
return 0;
}
/* Set the features advertised by 'netdev' to 'advertise'. */
static int
netdev_linux_set_advertisements(struct netdev *netdev, uint32_t advertise)
{
struct ethtool_cmd ecmd;
int error;
memset(&ecmd, 0, sizeof ecmd);
error = netdev_linux_do_ethtool(netdev_get_name(netdev), &ecmd,
ETHTOOL_GSET, "ETHTOOL_GSET");
if (error) {
return error;
}
ecmd.advertising = 0;
if (advertise & OFPPF_10MB_HD) {
ecmd.advertising |= ADVERTISED_10baseT_Half;
}
if (advertise & OFPPF_10MB_FD) {
ecmd.advertising |= ADVERTISED_10baseT_Full;
}
if (advertise & OFPPF_100MB_HD) {
ecmd.advertising |= ADVERTISED_100baseT_Half;
}
if (advertise & OFPPF_100MB_FD) {
ecmd.advertising |= ADVERTISED_100baseT_Full;
}
if (advertise & OFPPF_1GB_HD) {
ecmd.advertising |= ADVERTISED_1000baseT_Half;
}
if (advertise & OFPPF_1GB_FD) {
ecmd.advertising |= ADVERTISED_1000baseT_Full;
}
if (advertise & OFPPF_10GB_FD) {
ecmd.advertising |= ADVERTISED_10000baseT_Full;
}
if (advertise & OFPPF_COPPER) {
ecmd.advertising |= ADVERTISED_TP;
}
if (advertise & OFPPF_FIBER) {
ecmd.advertising |= ADVERTISED_FIBRE;
}
if (advertise & OFPPF_AUTONEG) {
ecmd.advertising |= ADVERTISED_Autoneg;
}
if (advertise & OFPPF_PAUSE) {
ecmd.advertising |= ADVERTISED_Pause;
}
if (advertise & OFPPF_PAUSE_ASYM) {
ecmd.advertising |= ADVERTISED_Asym_Pause;
}
return netdev_linux_do_ethtool(netdev_get_name(netdev), &ecmd,
ETHTOOL_SSET, "ETHTOOL_SSET");
}
/* If 'netdev_name' is the name of a VLAN network device (e.g. one created with
* vconfig(8)), sets '*vlan_vid' to the VLAN VID associated with that device
* and returns 0. Otherwise returns a errno value (specifically ENOENT if
* 'netdev_name' is the name of a network device that is not a VLAN device) and
* sets '*vlan_vid' to -1. */
static int
netdev_linux_get_vlan_vid(const struct netdev *netdev, int *vlan_vid)
{
const char *netdev_name = netdev_get_name(netdev);
struct ds line = DS_EMPTY_INITIALIZER;
FILE *stream = NULL;
int error;
char *fn;
COVERAGE_INC(netdev_get_vlan_vid);
fn = xasprintf("/proc/net/vlan/%s", netdev_name);
stream = fopen(fn, "r");
if (!stream) {
error = errno;
goto done;
}
if (ds_get_line(&line, stream)) {
if (ferror(stream)) {
error = errno;
VLOG_ERR_RL(&rl, "error reading \"%s\": %s", fn, strerror(errno));
} else {
error = EPROTO;
VLOG_ERR_RL(&rl, "unexpected end of file reading \"%s\"", fn);
}
goto done;
}
if (!sscanf(ds_cstr(&line), "%*s VID: %d", vlan_vid)) {
error = EPROTO;
VLOG_ERR_RL(&rl, "parse error reading \"%s\" line 1: \"%s\"",
fn, ds_cstr(&line));
goto done;
}
error = 0;
done:
free(fn);
if (stream) {
fclose(stream);
}
ds_destroy(&line);
if (error) {
*vlan_vid = -1;
}
return error;
}
#define POLICE_ADD_CMD "/sbin/tc qdisc add dev %s handle ffff: ingress"
#define POLICE_CONFIG_CMD "/sbin/tc filter add dev %s parent ffff: protocol ip prio 50 u32 match ip src 0.0.0.0/0 police rate %dkbit burst %dk mtu 65535 drop flowid :1"
/* We redirect stderr to /dev/null because we often want to remove all
* traffic control configuration on a port so its in a known state. If
* this done when there is no such configuration, tc complains, so we just
* always ignore it.
*/
#define POLICE_DEL_CMD "/sbin/tc qdisc del dev %s handle ffff: ingress 2>/dev/null"
/* Remove ingress policing from 'netdev'. Returns 0 if successful, otherwise a
* positive errno value. */
static int
netdev_linux_remove_policing(struct netdev *netdev)
{
const char *netdev_name = netdev_get_name(netdev);
char command[1024];
/* xxx This should be more careful about only adding if it
* xxx actually exists, as opposed to always deleting it. */
snprintf(command, sizeof(command), POLICE_DEL_CMD, netdev_name);
if (system(command) == -1) {
VLOG_WARN_RL(&rl, "%s: problem removing policing", netdev_name);
return ECHILD;
}
return 0;
}
/* Attempts to set input rate limiting (policing) policy. */
static int
netdev_linux_set_policing(struct netdev *netdev,
uint32_t kbits_rate, uint32_t kbits_burst)
{
const char *netdev_name = netdev_get_name(netdev);
char command[1024];
COVERAGE_INC(netdev_set_policing);
netdev_linux_remove_policing(netdev);
if (kbits_rate) {
if (!kbits_burst) {
/* Default to 1000 kilobits if not specified. */
kbits_burst = 1000;
}
snprintf(command, sizeof(command), POLICE_ADD_CMD, netdev_name);
if (system(command) != 0) {
VLOG_WARN_RL(&rl, "%s: problem adding policing", netdev_name);
return -1;
}
snprintf(command, sizeof(command), POLICE_CONFIG_CMD, netdev_name,
kbits_rate, kbits_burst);
if (system(command) != 0) {
VLOG_WARN_RL(&rl, "%s: problem configuring policing",
netdev_name);
return -1;
}
}
return 0;
}
static int
netdev_linux_get_in4(const struct netdev *netdev_,
struct in_addr *address, struct in_addr *netmask)
{
struct netdev_dev_linux *netdev_dev =
netdev_dev_linux_cast(netdev_get_dev(netdev_));
if (!(netdev_dev->cache_valid & VALID_IN4)) {
int error;
error = netdev_linux_get_ipv4(netdev_, &netdev_dev->address,
SIOCGIFADDR, "SIOCGIFADDR");
if (error) {
return error;
}
error = netdev_linux_get_ipv4(netdev_, &netdev_dev->netmask,
SIOCGIFNETMASK, "SIOCGIFNETMASK");
if (error) {
return error;
}
netdev_dev->cache_valid |= VALID_IN4;
}
*address = netdev_dev->address;
*netmask = netdev_dev->netmask;
return address->s_addr == INADDR_ANY ? EADDRNOTAVAIL : 0;
}
static int
netdev_linux_set_in4(struct netdev *netdev_, struct in_addr address,
struct in_addr netmask)
{
struct netdev_dev_linux *netdev_dev =
netdev_dev_linux_cast(netdev_get_dev(netdev_));
int error;
error = do_set_addr(netdev_, SIOCSIFADDR, "SIOCSIFADDR", address);
if (!error) {
netdev_dev->cache_valid |= VALID_IN4;
netdev_dev->address = address;
netdev_dev->netmask = netmask;
if (address.s_addr != INADDR_ANY) {
error = do_set_addr(netdev_, SIOCSIFNETMASK,
"SIOCSIFNETMASK", netmask);
}
}
return error;
}
static bool
parse_if_inet6_line(const char *line,
struct in6_addr *in6, char ifname[16 + 1])
{
uint8_t *s6 = in6->s6_addr;
#define X8 "%2"SCNx8
return sscanf(line,
" "X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8 X8
"%*x %*x %*x %*x %16s\n",
&s6[0], &s6[1], &s6[2], &s6[3],
&s6[4], &s6[5], &s6[6], &s6[7],
&s6[8], &s6[9], &s6[10], &s6[11],
&s6[12], &s6[13], &s6[14], &s6[15],
ifname) == 17;
}
/* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address (if
* 'in6' is non-null) and returns true. Otherwise, returns false. */
static int
netdev_linux_get_in6(const struct netdev *netdev_, struct in6_addr *in6)
{
struct netdev_dev_linux *netdev_dev =
netdev_dev_linux_cast(netdev_get_dev(netdev_));
if (!(netdev_dev->cache_valid & VALID_IN6)) {
FILE *file;
char line[128];
netdev_dev->in6 = in6addr_any;
file = fopen("/proc/net/if_inet6", "r");
if (file != NULL) {
const char *name = netdev_get_name(netdev_);
while (fgets(line, sizeof line, file)) {
struct in6_addr in6;
char ifname[16 + 1];
if (parse_if_inet6_line(line, &in6, ifname)
&& !strcmp(name, ifname))
{
netdev_dev->in6 = in6;
break;
}
}
fclose(file);
}
netdev_dev->cache_valid |= VALID_IN6;
}
*in6 = netdev_dev->in6;
return 0;
}
static void
make_in4_sockaddr(struct sockaddr *sa, struct in_addr addr)
{
struct sockaddr_in sin;
memset(&sin, 0, sizeof sin);
sin.sin_family = AF_INET;
sin.sin_addr = addr;
sin.sin_port = 0;
memset(sa, 0, sizeof *sa);
memcpy(sa, &sin, sizeof sin);
}
static int
do_set_addr(struct netdev *netdev,
int ioctl_nr, const char *ioctl_name, struct in_addr addr)
{
struct ifreq ifr;
strncpy(ifr.ifr_name, netdev_get_name(netdev), sizeof ifr.ifr_name);
make_in4_sockaddr(&ifr.ifr_addr, addr);
return netdev_linux_do_ioctl(netdev_get_name(netdev), &ifr, ioctl_nr,
ioctl_name);
}
/* Adds 'router' as a default IP gateway. */
static int
netdev_linux_add_router(struct netdev *netdev OVS_UNUSED, struct in_addr router)
{
struct in_addr any = { INADDR_ANY };
struct rtentry rt;
int error;
memset(&rt, 0, sizeof rt);
make_in4_sockaddr(&rt.rt_dst, any);
make_in4_sockaddr(&rt.rt_gateway, router);
make_in4_sockaddr(&rt.rt_genmask, any);
rt.rt_flags = RTF_UP | RTF_GATEWAY;
COVERAGE_INC(netdev_add_router);
error = ioctl(af_inet_sock, SIOCADDRT, &rt) < 0 ? errno : 0;
if (error) {
VLOG_WARN("ioctl(SIOCADDRT): %s", strerror(error));
}
return error;
}
static int
netdev_linux_get_next_hop(const struct in_addr *host, struct in_addr *next_hop,
char **netdev_name)
{
static const char fn[] = "/proc/net/route";
FILE *stream;
char line[256];
int ln;
*netdev_name = NULL;
stream = fopen(fn, "r");
if (stream == NULL) {
VLOG_WARN_RL(&rl, "%s: open failed: %s", fn, strerror(errno));
return errno;
}
ln = 0;
while (fgets(line, sizeof line, stream)) {
if (++ln >= 2) {
char iface[17];
uint32_t dest, gateway, mask;
int refcnt, metric, mtu;
unsigned int flags, use, window, irtt;
if (sscanf(line,
"%16s %"SCNx32" %"SCNx32" %04X %d %u %d %"SCNx32
" %d %u %u\n",
iface, &dest, &gateway, &flags, &refcnt,
&use, &metric, &mask, &mtu, &window, &irtt) != 11) {
VLOG_WARN_RL(&rl, "%s: could not parse line %d: %s",
fn, ln, line);
continue;
}
if (!(flags & RTF_UP)) {
/* Skip routes that aren't up. */
continue;
}
/* The output of 'dest', 'mask', and 'gateway' were given in
* network byte order, so we don't need need any endian
* conversions here. */
if ((dest & mask) == (host->s_addr & mask)) {
if (!gateway) {
/* The host is directly reachable. */
next_hop->s_addr = 0;
} else {
/* To reach the host, we must go through a gateway. */
next_hop->s_addr = gateway;
}
*netdev_name = xstrdup(iface);
fclose(stream);
return 0;
}
}
}
fclose(stream);
return ENXIO;
}
/* Looks up the ARP table entry for 'ip' on 'netdev'. If one exists and can be
* successfully retrieved, it stores the corresponding MAC address in 'mac' and
* returns 0. Otherwise, it returns a positive errno value; in particular,
* ENXIO indicates that there is not ARP table entry for 'ip' on 'netdev'. */
static int
netdev_linux_arp_lookup(const struct netdev *netdev,
uint32_t ip, uint8_t mac[ETH_ADDR_LEN])
{
struct arpreq r;
struct sockaddr_in sin;
int retval;
memset(&r, 0, sizeof r);
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = ip;
sin.sin_port = 0;
memcpy(&r.arp_pa, &sin, sizeof sin);
r.arp_ha.sa_family = ARPHRD_ETHER;
r.arp_flags = 0;
strncpy(r.arp_dev, netdev_get_name(netdev), sizeof r.arp_dev);
COVERAGE_INC(netdev_arp_lookup);
retval = ioctl(af_inet_sock, SIOCGARP, &r) < 0 ? errno : 0;
if (!retval) {
memcpy(mac, r.arp_ha.sa_data, ETH_ADDR_LEN);
} else if (retval != ENXIO) {
VLOG_WARN_RL(&rl, "%s: could not look up ARP entry for "IP_FMT": %s",
netdev_get_name(netdev), IP_ARGS(&ip), strerror(retval));
}
return retval;
}
static int
nd_to_iff_flags(enum netdev_flags nd)
{
int iff = 0;
if (nd & NETDEV_UP) {
iff |= IFF_UP;
}
if (nd & NETDEV_PROMISC) {
iff |= IFF_PROMISC;
}
return iff;
}
static int
iff_to_nd_flags(int iff)
{
enum netdev_flags nd = 0;
if (iff & IFF_UP) {
nd |= NETDEV_UP;
}
if (iff & IFF_PROMISC) {
nd |= NETDEV_PROMISC;
}
return nd;
}
static int
netdev_linux_update_flags(struct netdev *netdev, enum netdev_flags off,
enum netdev_flags on, enum netdev_flags *old_flagsp)
{
int old_flags, new_flags;
int error;
error = get_flags(netdev, &old_flags);
if (!error) {
*old_flagsp = iff_to_nd_flags(old_flags);
new_flags = (old_flags & ~nd_to_iff_flags(off)) | nd_to_iff_flags(on);
if (new_flags != old_flags) {
error = set_flags(netdev, new_flags);
}
}
return error;
}
static void
poll_notify(struct list *list)
{
struct netdev_linux_notifier *notifier;
LIST_FOR_EACH (notifier, struct netdev_linux_notifier, node, list) {
struct netdev_notifier *n = &notifier->notifier;
n->cb(n);
}
}
static void
netdev_linux_poll_cb(const struct rtnetlink_change *change,
void *aux OVS_UNUSED)
{
if (change) {
struct list *list = shash_find_data(&netdev_linux_notifiers,
change->ifname);
if (list) {
poll_notify(list);
}
} else {
struct shash_node *node;
SHASH_FOR_EACH (node, &netdev_linux_notifiers) {
poll_notify(node->data);
}
}
}
static int
netdev_linux_poll_add(struct netdev *netdev,
void (*cb)(struct netdev_notifier *), void *aux,
struct netdev_notifier **notifierp)
{
const char *netdev_name = netdev_get_name(netdev);
struct netdev_linux_notifier *notifier;
struct list *list;
if (shash_is_empty(&netdev_linux_notifiers)) {
int error = rtnetlink_notifier_register(&netdev_linux_poll_notifier,
netdev_linux_poll_cb, NULL);
if (error) {
return error;
}
}
list = shash_find_data(&netdev_linux_notifiers, netdev_name);
if (!list) {
list = xmalloc(sizeof *list);
list_init(list);
shash_add(&netdev_linux_notifiers, netdev_name, list);
}
notifier = xmalloc(sizeof *notifier);
netdev_notifier_init(&notifier->notifier, netdev, cb, aux);
list_push_back(list, &notifier->node);
*notifierp = &notifier->notifier;
return 0;
}
static void
netdev_linux_poll_remove(struct netdev_notifier *notifier_)
{
struct netdev_linux_notifier *notifier =
CONTAINER_OF(notifier_, struct netdev_linux_notifier, notifier);
struct list *list;
/* Remove 'notifier' from its list. */
list = list_remove(&notifier->node);
if (list_is_empty(list)) {
/* The list is now empty. Remove it from the hash and free it. */
const char *netdev_name = netdev_get_name(notifier->notifier.netdev);
shash_delete(&netdev_linux_notifiers,
shash_find(&netdev_linux_notifiers, netdev_name));
free(list);
}
free(notifier);
/* If that was the last notifier, unregister. */
if (shash_is_empty(&netdev_linux_notifiers)) {
rtnetlink_notifier_unregister(&netdev_linux_poll_notifier);
}
}
const struct netdev_class netdev_linux_class = {
"system",
netdev_linux_init,
netdev_linux_run,
netdev_linux_wait,
netdev_linux_create_system,
netdev_linux_destroy,
NULL, /* reconfigure */
netdev_linux_open,
netdev_linux_close,
netdev_linux_enumerate,
netdev_linux_recv,
netdev_linux_recv_wait,
netdev_linux_drain,
netdev_linux_send,
netdev_linux_send_wait,
netdev_linux_set_etheraddr,
netdev_linux_get_etheraddr,
netdev_linux_get_mtu,
netdev_linux_get_ifindex,
netdev_linux_get_carrier,
netdev_linux_get_stats,
netdev_linux_set_stats,
netdev_linux_get_features,
netdev_linux_set_advertisements,
netdev_linux_get_vlan_vid,
netdev_linux_set_policing,
netdev_linux_get_in4,
netdev_linux_set_in4,
netdev_linux_get_in6,
netdev_linux_add_router,
netdev_linux_get_next_hop,
netdev_linux_arp_lookup,
netdev_linux_update_flags,
netdev_linux_poll_add,
netdev_linux_poll_remove,
};
const struct netdev_class netdev_tap_class = {
"tap",
netdev_linux_init,
netdev_linux_run,
netdev_linux_wait,
netdev_linux_create_tap,
netdev_linux_destroy,
NULL, /* reconfigure */
netdev_linux_open,
netdev_linux_close,
NULL, /* enumerate */
netdev_linux_recv,
netdev_linux_recv_wait,
netdev_linux_drain,
netdev_linux_send,
netdev_linux_send_wait,
netdev_linux_set_etheraddr,
netdev_linux_get_etheraddr,
netdev_linux_get_mtu,
netdev_linux_get_ifindex,
netdev_linux_get_carrier,
netdev_linux_get_stats,
NULL, /* set_stats */
netdev_linux_get_features,
netdev_linux_set_advertisements,
netdev_linux_get_vlan_vid,
netdev_linux_set_policing,
netdev_linux_get_in4,
netdev_linux_set_in4,
netdev_linux_get_in6,
netdev_linux_add_router,
netdev_linux_get_next_hop,
netdev_linux_arp_lookup,
netdev_linux_update_flags,
netdev_linux_poll_add,
netdev_linux_poll_remove,
};
const struct netdev_class netdev_patch_class = {
"patch",
netdev_linux_init,
netdev_linux_run,
netdev_linux_wait,
netdev_linux_create_patch,
netdev_linux_destroy,
NULL, /* reconfigure */
netdev_linux_open,
netdev_linux_close,
NULL, /* enumerate */
netdev_linux_recv,
netdev_linux_recv_wait,
netdev_linux_drain,
netdev_linux_send,
netdev_linux_send_wait,
netdev_linux_set_etheraddr,
netdev_linux_get_etheraddr,
netdev_linux_get_mtu,
netdev_linux_get_ifindex,
netdev_linux_get_carrier,
netdev_linux_get_stats,
NULL, /* set_stats */
netdev_linux_get_features,
netdev_linux_set_advertisements,
netdev_linux_get_vlan_vid,
netdev_linux_set_policing,
netdev_linux_get_in4,
netdev_linux_set_in4,
netdev_linux_get_in6,
netdev_linux_add_router,
netdev_linux_get_next_hop,
netdev_linux_arp_lookup,
netdev_linux_update_flags,
netdev_linux_poll_add,
netdev_linux_poll_remove,
};
static int
get_stats_via_netlink(int ifindex, struct netdev_stats *stats)
{
/* Policy for RTNLGRP_LINK messages.
*
* There are *many* more fields in these messages, but currently we only
* care about these fields. */
static const struct nl_policy rtnlgrp_link_policy[] = {
[IFLA_IFNAME] = { .type = NL_A_STRING, .optional = false },
[IFLA_STATS] = { .type = NL_A_UNSPEC, .optional = true,
.min_len = sizeof(struct rtnl_link_stats) },
};
struct nl_sock *rtnl_sock;
struct ofpbuf request;
struct ofpbuf *reply;
struct ifinfomsg *ifi;
const struct rtnl_link_stats *rtnl_stats;
struct nlattr *attrs[ARRAY_SIZE(rtnlgrp_link_policy)];
int error;
error = get_rtnl_sock(&rtnl_sock);
if (error) {
return error;
}
ofpbuf_init(&request, 0);
nl_msg_put_nlmsghdr(&request, rtnl_sock, sizeof *ifi,
RTM_GETLINK, NLM_F_REQUEST);
ifi = ofpbuf_put_zeros(&request, sizeof *ifi);
ifi->ifi_family = PF_UNSPEC;
ifi->ifi_index = ifindex;
error = nl_sock_transact(rtnl_sock, &request, &reply);
ofpbuf_uninit(&request);
if (error) {
return error;
}
if (!nl_policy_parse(reply, NLMSG_HDRLEN + sizeof(struct ifinfomsg),
rtnlgrp_link_policy,
attrs, ARRAY_SIZE(rtnlgrp_link_policy))) {
ofpbuf_delete(reply);
return EPROTO;
}
if (!attrs[IFLA_STATS]) {
VLOG_WARN_RL(&rl, "RTM_GETLINK reply lacks stats");
ofpbuf_delete(reply);
return EPROTO;
}
rtnl_stats = nl_attr_get(attrs[IFLA_STATS]);
stats->rx_packets = rtnl_stats->rx_packets;
stats->tx_packets = rtnl_stats->tx_packets;
stats->rx_bytes = rtnl_stats->rx_bytes;
stats->tx_bytes = rtnl_stats->tx_bytes;
stats->rx_errors = rtnl_stats->rx_errors;
stats->tx_errors = rtnl_stats->tx_errors;
stats->rx_dropped = rtnl_stats->rx_dropped;
stats->tx_dropped = rtnl_stats->tx_dropped;
stats->multicast = rtnl_stats->multicast;
stats->collisions = rtnl_stats->collisions;
stats->rx_length_errors = rtnl_stats->rx_length_errors;
stats->rx_over_errors = rtnl_stats->rx_over_errors;
stats->rx_crc_errors = rtnl_stats->rx_crc_errors;
stats->rx_frame_errors = rtnl_stats->rx_frame_errors;
stats->rx_fifo_errors = rtnl_stats->rx_fifo_errors;
stats->rx_missed_errors = rtnl_stats->rx_missed_errors;
stats->tx_aborted_errors = rtnl_stats->tx_aborted_errors;
stats->tx_carrier_errors = rtnl_stats->tx_carrier_errors;
stats->tx_fifo_errors = rtnl_stats->tx_fifo_errors;
stats->tx_heartbeat_errors = rtnl_stats->tx_heartbeat_errors;
stats->tx_window_errors = rtnl_stats->tx_window_errors;
ofpbuf_delete(reply);
return 0;
}
static int
get_stats_via_proc(const char *netdev_name, struct netdev_stats *stats)
{
static const char fn[] = "/proc/net/dev";
char line[1024];
FILE *stream;
int ln;
stream = fopen(fn, "r");
if (!stream) {
VLOG_WARN_RL(&rl, "%s: open failed: %s", fn, strerror(errno));
return errno;
}
ln = 0;
while (fgets(line, sizeof line, stream)) {
if (++ln >= 3) {
char devname[16];
#define X64 "%"SCNu64
if (sscanf(line,
" %15[^:]:"
X64 X64 X64 X64 X64 X64 X64 "%*u"
X64 X64 X64 X64 X64 X64 X64 "%*u",
devname,
&stats->rx_bytes,
&stats->rx_packets,
&stats->rx_errors,
&stats->rx_dropped,
&stats->rx_fifo_errors,
&stats->rx_frame_errors,
&stats->multicast,
&stats->tx_bytes,
&stats->tx_packets,
&stats->tx_errors,
&stats->tx_dropped,
&stats->tx_fifo_errors,
&stats->collisions,
&stats->tx_carrier_errors) != 15) {
VLOG_WARN_RL(&rl, "%s:%d: parse error", fn, ln);
} else if (!strcmp(devname, netdev_name)) {
stats->rx_length_errors = UINT64_MAX;
stats->rx_over_errors = UINT64_MAX;
stats->rx_crc_errors = UINT64_MAX;
stats->rx_missed_errors = UINT64_MAX;
stats->tx_aborted_errors = UINT64_MAX;
stats->tx_heartbeat_errors = UINT64_MAX;
stats->tx_window_errors = UINT64_MAX;
fclose(stream);
return 0;
}
}
}
VLOG_WARN_RL(&rl, "%s: no stats for %s", fn, netdev_name);
fclose(stream);
return ENODEV;
}
static int
get_flags(const struct netdev *netdev, int *flags)
{
struct ifreq ifr;
int error;
error = netdev_linux_do_ioctl(netdev_get_name(netdev), &ifr, SIOCGIFFLAGS,
"SIOCGIFFLAGS");
*flags = ifr.ifr_flags;
return error;
}
static int
set_flags(struct netdev *netdev, int flags)
{
struct ifreq ifr;
ifr.ifr_flags = flags;
return netdev_linux_do_ioctl(netdev_get_name(netdev), &ifr, SIOCSIFFLAGS,
"SIOCSIFFLAGS");
}
static int
do_get_ifindex(const char *netdev_name)
{
struct ifreq ifr;
strncpy(ifr.ifr_name, netdev_name, sizeof ifr.ifr_name);
COVERAGE_INC(netdev_get_ifindex);
if (ioctl(af_inet_sock, SIOCGIFINDEX, &ifr) < 0) {
VLOG_WARN_RL(&rl, "ioctl(SIOCGIFINDEX) on %s device failed: %s",
netdev_name, strerror(errno));
return -errno;
}
return ifr.ifr_ifindex;
}
static int
get_ifindex(const struct netdev *netdev_, int *ifindexp)
{
struct netdev_dev_linux *netdev_dev =
netdev_dev_linux_cast(netdev_get_dev(netdev_));
*ifindexp = 0;
if (!(netdev_dev->cache_valid & VALID_IFINDEX)) {
int ifindex = do_get_ifindex(netdev_get_name(netdev_));
if (ifindex < 0) {
return -ifindex;
}
netdev_dev->cache_valid |= VALID_IFINDEX;
netdev_dev->ifindex = ifindex;
}
*ifindexp = netdev_dev->ifindex;
return 0;
}
static int
get_etheraddr(const char *netdev_name, uint8_t ea[ETH_ADDR_LEN])
{
struct ifreq ifr;
int hwaddr_family;
memset(&ifr, 0, sizeof ifr);
strncpy(ifr.ifr_name, netdev_name, sizeof ifr.ifr_name);
COVERAGE_INC(netdev_get_hwaddr);
if (ioctl(af_inet_sock, SIOCGIFHWADDR, &ifr) < 0) {
VLOG_ERR("ioctl(SIOCGIFHWADDR) on %s device failed: %s",
netdev_name, strerror(errno));
return errno;
}
hwaddr_family = ifr.ifr_hwaddr.sa_family;
if (hwaddr_family != AF_UNSPEC && hwaddr_family != ARPHRD_ETHER) {
VLOG_WARN("%s device has unknown hardware address family %d",
netdev_name, hwaddr_family);
}
memcpy(ea, ifr.ifr_hwaddr.sa_data, ETH_ADDR_LEN);
return 0;
}
static int
set_etheraddr(const char *netdev_name, int hwaddr_family,
const uint8_t mac[ETH_ADDR_LEN])
{
struct ifreq ifr;
memset(&ifr, 0, sizeof ifr);
strncpy(ifr.ifr_name, netdev_name, sizeof ifr.ifr_name);
ifr.ifr_hwaddr.sa_family = hwaddr_family;
memcpy(ifr.ifr_hwaddr.sa_data, mac, ETH_ADDR_LEN);
COVERAGE_INC(netdev_set_hwaddr);
if (ioctl(af_inet_sock, SIOCSIFHWADDR, &ifr) < 0) {
VLOG_ERR("ioctl(SIOCSIFHWADDR) on %s device failed: %s",
netdev_name, strerror(errno));
return errno;
}
return 0;
}
static int
netdev_linux_do_ethtool(const char *name, struct ethtool_cmd *ecmd,
int cmd, const char *cmd_name)
{
struct ifreq ifr;
memset(&ifr, 0, sizeof ifr);
strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
ifr.ifr_data = (caddr_t) ecmd;
ecmd->cmd = cmd;
COVERAGE_INC(netdev_ethtool);
if (ioctl(af_inet_sock, SIOCETHTOOL, &ifr) == 0) {
return 0;
} else {
if (errno != EOPNOTSUPP) {
VLOG_WARN_RL(&rl, "ethtool command %s on network device %s "
"failed: %s", cmd_name, name, strerror(errno));
} else {
/* The device doesn't support this operation. That's pretty
* common, so there's no point in logging anything. */
}
return errno;
}
}
static int
netdev_linux_do_ioctl(const char *name, struct ifreq *ifr, int cmd,
const char *cmd_name)
{
strncpy(ifr->ifr_name, name, sizeof ifr->ifr_name);
if (ioctl(af_inet_sock, cmd, ifr) == -1) {
VLOG_DBG_RL(&rl, "%s: ioctl(%s) failed: %s", name, cmd_name,
strerror(errno));
return errno;
}
return 0;
}
static int
netdev_linux_get_ipv4(const struct netdev *netdev, struct in_addr *ip,
int cmd, const char *cmd_name)
{
struct ifreq ifr;
int error;
ifr.ifr_addr.sa_family = AF_INET;
error = netdev_linux_do_ioctl(netdev_get_name(netdev), &ifr, cmd, cmd_name);
if (!error) {
const struct sockaddr_in *sin = (struct sockaddr_in *) &ifr.ifr_addr;
*ip = sin->sin_addr;
}
return error;
}
/* Obtains a Netlink routing socket that is not subscribed to any multicast
* groups. Returns 0 if successful, otherwise a positive errno value. Stores
* the socket in '*rtnl_sockp' if successful, otherwise a null pointer. */
static int
get_rtnl_sock(struct nl_sock **rtnl_sockp)
{
static struct nl_sock *sock;
int error;
if (!sock) {
error = nl_sock_create(NETLINK_ROUTE, 0, 0, 0, &sock);
if (error) {
VLOG_ERR_RL(&rl, "failed to create rtnetlink socket: %s",
strerror(error));
}
} else {
error = 0;
}
*rtnl_sockp = sock;
return error;
}
Reference in New Issue View Git Blame Copy Permalink