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ovs/lib/netdev-bsd.c
Ben Pfaff cb22974d77 Replace most uses of assert by ovs_assert. 
This is a straight search-and-replace, except that I also removed #include
<assert.h> from each file where there were no assert calls left.

Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
2013-01-16 16:03:37 -08:00

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/*
* Copyright (c) 2011 Gaetano Catalli.
*
* 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 <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <ifaddrs.h>
#include <pcap/pcap.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_tap.h>
#include <netinet/in.h>
#include <net/if_mib.h>
#include <poll.h>
#include <string.h>
#include <unistd.h>
#include <sys/sysctl.h>
#include "rtbsd.h"
#include "coverage.h"
#include "dynamic-string.h"
#include "fatal-signal.h"
#include "netdev-provider.h"
#include "ofpbuf.h"
#include "openflow/openflow.h"
#include "packets.h"
#include "poll-loop.h"
#include "socket-util.h"
#include "shash.h"
#include "svec.h"
#include "util.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(netdev_bsd);
/*
* This file implements objects to access interfaces.
* Externally, interfaces are represented by two structures:
* + struct netdev_dev, representing a network device,
* containing e.g. name and a refcount;
* We can have private variables by embedding the
* struct netdev_dev into our own structure
* (e.g. netdev_dev_bsd)
*
* + struct netdev, representing an instance of an open netdev_dev.
* The structure contains a pointer to the 'struct netdev'
* representing the device. Again, private information
* such as file descriptor etc. are stored in our
* own struct netdev_bsd which includes a struct netdev.
*
* Both 'struct netdev' and 'struct netdev_dev' are referenced
* in containers which hold pointers to the data structures.
* We can reach our own struct netdev_XXX_bsd by putting a
* struct netdev_XXX within our own struct, and using CONTAINER_OF
* to access the parent structure.
*/
struct netdev_bsd {
struct netdev netdev;
int netdev_fd; /* Selectable file descriptor for the network device.
This descriptor will be used for polling operations */
pcap_t *pcap_handle; /* Packet capture descriptor for a system network
device */
};
struct netdev_dev_bsd {
struct netdev_dev netdev_dev;
unsigned int cache_valid;
unsigned int change_seq;
int ifindex;
uint8_t etheraddr[ETH_ADDR_LEN];
struct in_addr in4;
struct in6_addr in6;
int mtu;
int carrier;
bool tap_opened;
int tap_fd; /* TAP character device, if any */
};
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
};
/* An AF_INET socket (used for ioctl operations). */
static int af_inet_sock = -1;
#define PCAP_SNAPLEN 2048
/*
* Notifier used to invalidate device informations in case of status change.
*
* It will be registered with a 'rtbsd_notifier_register()' when the first
* device will be created with the call of either 'netdev_bsd_tap_create()' or
* 'netdev_bsd_system_create()'.
*
* The callback associated with this notifier ('netdev_bsd_cache_cb()') will
* invalidate cached information about the device.
*/
static struct rtbsd_notifier netdev_bsd_cache_notifier;
static int cache_notifier_refcount;
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
static int netdev_bsd_do_ioctl(const struct netdev *, struct ifreq *,
unsigned long cmd, const char *cmd_name);
static void destroy_tap(int fd, const char *name);
static int get_flags(const struct netdev *, int *flagsp);
static int set_flags(struct netdev *, int flags);
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,
int hwaddr_len, const uint8_t[ETH_ADDR_LEN]);
static int get_ifindex(const struct netdev *, int *ifindexp);
static int netdev_bsd_init(void);
static bool
is_netdev_bsd_class(const struct netdev_class *netdev_class)
{
return netdev_class->init == netdev_bsd_init;
}
static struct netdev_bsd *
netdev_bsd_cast(const struct netdev *netdev)
{
ovs_assert(is_netdev_bsd_class(netdev_dev_get_class(
netdev_get_dev(netdev))));
return CONTAINER_OF(netdev, struct netdev_bsd, netdev);
}
static struct netdev_dev_bsd *
netdev_dev_bsd_cast(const struct netdev_dev *netdev_dev)
{
ovs_assert(is_netdev_bsd_class(netdev_dev_get_class(netdev_dev)));
return CONTAINER_OF(netdev_dev, struct netdev_dev_bsd, netdev_dev);
}
/* Initialize the AF_INET socket used for ioctl operations */
static int
netdev_bsd_init(void)
{
static int status = -1;
if (status >= 0) { /* already initialized */
return status;
}
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;
}
/*
* Perform periodic work needed by netdev. In BSD netdevs it checks for any
* interface status changes, and eventually calls all the user callbacks.
*/
static void
netdev_bsd_run(void)
{
rtbsd_notifier_run();
}
/*
* Arranges for poll_block() to wake up if the "run" member function needs to
* be called.
*/
static void
netdev_bsd_wait(void)
{
rtbsd_notifier_wait();
}
static void
netdev_dev_bsd_changed(struct netdev_dev_bsd *dev)
{
dev->change_seq++;
if (!dev->change_seq) {
dev->change_seq++;
}
}
/* Invalidate cache in case of interface status change. */
static void
netdev_bsd_cache_cb(const struct rtbsd_change *change,
void *aux OVS_UNUSED)
{
struct netdev_dev_bsd *dev;
if (change) {
struct netdev_dev *base_dev = netdev_dev_from_name(change->if_name);
if (base_dev) {
const struct netdev_class *netdev_class =
netdev_dev_get_class(base_dev);
if (is_netdev_bsd_class(netdev_class)) {
dev = netdev_dev_bsd_cast(base_dev);
dev->cache_valid = 0;
netdev_dev_bsd_changed(dev);
}
}
} else {
/*
* XXX the API is lacking, we should be able to iterate on the list of
* netdevs without having to store the info in a temp shash.
*/
struct shash device_shash;
struct shash_node *node;
shash_init(&device_shash);
netdev_dev_get_devices(&netdev_bsd_class, &device_shash);
SHASH_FOR_EACH (node, &device_shash) {
dev = node->data;
dev->cache_valid = 0;
netdev_dev_bsd_changed(dev);
}
shash_destroy(&device_shash);
}
}
static int
cache_notifier_ref(void)
{
int ret = 0;
if (!cache_notifier_refcount) {
ret = rtbsd_notifier_register(&netdev_bsd_cache_notifier,
netdev_bsd_cache_cb, NULL);
if (ret) {
return ret;
}
}
cache_notifier_refcount++;
return 0;
}
static int
cache_notifier_unref(void)
{
cache_notifier_refcount--;
if (cache_notifier_refcount == 0) {
rtbsd_notifier_unregister(&netdev_bsd_cache_notifier);
}
return 0;
}
/* Allocate a netdev_dev_bsd structure */
static int
netdev_bsd_create_system(const struct netdev_class *class, const char *name,
struct netdev_dev **netdev_devp)
{
struct netdev_dev_bsd *netdev_dev;
int error;
error = cache_notifier_ref();
if (error) {
return error;
}
netdev_dev = xzalloc(sizeof *netdev_dev);
netdev_dev->change_seq = 1;
netdev_dev_init(&netdev_dev->netdev_dev, name, class);
*netdev_devp = &netdev_dev->netdev_dev;
return 0;
}
/*
* Allocate a netdev_dev_bsd structure with 'tap' class.
*/
static int
netdev_bsd_create_tap(const struct netdev_class *class, const char *name,
struct netdev_dev **netdev_devp)
{
struct netdev_dev_bsd *netdev_dev = NULL;
int error = 0;
struct ifreq ifr;
error = cache_notifier_ref();
if (error) {
goto error;
}
/* allocate the device structure and set the internal flag */
netdev_dev = xzalloc(sizeof *netdev_dev);
memset(&ifr, 0, sizeof(ifr));
/* Create a tap device by opening /dev/tap. The TAPGIFNAME ioctl is used
* to retrieve the name of the tap device. */
netdev_dev->tap_fd = open("/dev/tap", O_RDWR);
netdev_dev->change_seq = 1;
if (netdev_dev->tap_fd < 0) {
error = errno;
VLOG_WARN("opening \"/dev/tap\" failed: %s", strerror(error));
goto error_undef_notifier;
}
/* Retrieve tap name (e.g. tap0) */
if (ioctl(netdev_dev->tap_fd, TAPGIFNAME, &ifr) == -1) {
/* XXX Need to destroy the device? */
error = errno;
goto error_undef_notifier;
}
/* Change the name of the tap device */
ifr.ifr_data = (void *)name;
if (ioctl(af_inet_sock, SIOCSIFNAME, &ifr) == -1) {
error = errno;
destroy_tap(netdev_dev->tap_fd, ifr.ifr_name);
goto error_undef_notifier;
}
/* set non-blocking. */
error = set_nonblocking(netdev_dev->tap_fd);
if (error) {
destroy_tap(netdev_dev->tap_fd, name);
goto error_undef_notifier;
}
/* Turn device UP */
ifr.ifr_flags = (uint16_t)IFF_UP;
ifr.ifr_flagshigh = 0;
strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
if (ioctl(af_inet_sock, SIOCSIFFLAGS, &ifr) == -1) {
error = errno;
destroy_tap(netdev_dev->tap_fd, name);
goto error_undef_notifier;
}
/* initialize the device structure and
* link the structure to its netdev */
netdev_dev_init(&netdev_dev->netdev_dev, name, class);
*netdev_devp = &netdev_dev->netdev_dev;
return 0;
error_undef_notifier:
cache_notifier_unref();
error:
free(netdev_dev);
return error;
}
static void
netdev_bsd_destroy(struct netdev_dev *netdev_dev_)
{
struct netdev_dev_bsd *netdev_dev = netdev_dev_bsd_cast(netdev_dev_);
cache_notifier_unref();
if (netdev_dev->tap_fd >= 0 &&
!strcmp(netdev_dev_get_type(netdev_dev_), "tap")) {
destroy_tap(netdev_dev->tap_fd, netdev_dev_get_name(netdev_dev_));
}
free(netdev_dev);
}
static int
netdev_bsd_open_system(struct netdev_dev *netdev_dev_, struct netdev **netdevp)
{
struct netdev_bsd *netdev;
int error;
enum netdev_flags flags;
/* Allocate network device. */
netdev = xcalloc(1, sizeof *netdev);
netdev->netdev_fd = -1;
netdev_init(&netdev->netdev, netdev_dev_);
/* Verify that the netdev really exists by attempting to read its flags */
error = netdev_get_flags(&netdev->netdev, &flags);
if (error == ENXIO) {
goto error;
}
*netdevp = &netdev->netdev;
return 0;
error:
netdev_uninit(&netdev->netdev, true);
return error;
}
/* Close a 'netdev'. */
static void
netdev_bsd_close(struct netdev *netdev_)
{
struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
if (netdev->netdev_fd >= 0 && strcmp(netdev_get_type(netdev_), "tap")) {
pcap_close(netdev->pcap_handle);
}
free(netdev);
}
static int
netdev_bsd_listen(struct netdev *netdev_)
{
struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
struct netdev_dev_bsd *netdev_dev =
netdev_dev_bsd_cast(netdev_get_dev(netdev_));
char errbuf[PCAP_ERRBUF_SIZE];
int error;
int fd = -1;
int one = 1;
if (netdev->netdev_fd >= 0) {
return 0;
}
if (!strcmp(netdev_get_type(netdev_), "tap") &&
!netdev_dev->tap_opened) {
netdev->netdev_fd = netdev_dev->tap_fd;
netdev_dev->tap_opened = true;
return 0;
}
/* open the pcap device. The device is opened in non-promiscuous mode
* because the interface flags are manually set by the caller. */
errbuf[0] = '\0';
netdev->pcap_handle = pcap_open_live(netdev_get_name(netdev_), PCAP_SNAPLEN,
0, 1000, errbuf);
if (netdev->pcap_handle == NULL) {
VLOG_ERR("%s: pcap_open_live failed: %s",
netdev_get_name(netdev_), errbuf);
error = EIO;
goto error;
} else if (errbuf[0] != '\0') {
VLOG_WARN("%s: pcap_open_live: %s",
netdev_get_name(netdev_), errbuf);
}
netdev_dev_bsd_changed(netdev_dev_bsd_cast(netdev_get_dev(netdev_)));
/* initialize netdev->netdev_fd */
fd = pcap_get_selectable_fd(netdev->pcap_handle);
if (fd == -1) {
error = errno;
goto error;
}
/* Set non-blocking mode. Also the BIOCIMMEDIATE ioctl must be called
* on the file descriptor returned by pcap_get_selectable_fd to achieve
* a real non-blocking behaviour.*/
error = pcap_setnonblock(netdev->pcap_handle, 1, errbuf);
if (error == -1) {
error = errno;
goto error;
}
/* This call assure that reads return immediately upon packet reception.
* Otherwise, a read will block until either the kernel buffer becomes
* full or a timeout occurs. */
if(ioctl(fd, BIOCIMMEDIATE, &one) < 0 ) {
VLOG_ERR("ioctl(BIOCIMMEDIATE) on %s device failed: %s",
netdev_get_name(netdev_), strerror(errno));
error = errno;
goto error;
}
/* Capture only incoming packets */
error = pcap_setdirection(netdev->pcap_handle, PCAP_D_IN);
if (error == -1) {
error = errno;
goto error;
}
netdev->netdev_fd = fd;
return 0;
error:
if (fd >= 0) {
close(netdev->netdev_fd);
}
return error;
}
/* The recv callback of the netdev class returns the number of bytes of the
* received packet.
*
* This can be done by the pcap_next() function. Unfortunately pcap_next() does
* not make difference between a missing packet on the capture interface and
* an error during the file capture. We can use the pcap_dispatch() function
* instead, which is able to distinguish between errors and null packet.
*
* To make pcap_dispatch() returns the number of bytes read from the interface
* we need to define the following callback and argument.
*/
struct pcap_arg {
void *data;
int size;
int retval;
};
/*
* This callback will be executed on every captured packet.
*
* If the packet captured by pcap_dispatch() does not fit the pcap buffer,
* pcap returns a truncated packet and we follow this behavior.
*
* The argument args->retval is the packet size in bytes.
*/
static void
proc_pkt(u_char *args_, const struct pcap_pkthdr *hdr, const u_char *packet)
{
struct pcap_arg *args = (struct pcap_arg *)args_;
if (args->size < hdr->len) {
VLOG_WARN_RL(&rl, "packet truncated");
args->retval = args->size;
} else {
args->retval = hdr->len;
}
/* copy the packet to our buffer */
memcpy(args->data, packet, args->retval);
}
/*
* This function attempts to receive a packet from the specified network
* device. It is assumed that the network device is a system device or a tap
* device opened as a system one. In this case the read operation is performed
* on the 'netdev' pcap descriptor.
*/
static int
netdev_bsd_recv_system(struct netdev_bsd *netdev, void *data, size_t size)
{
struct pcap_arg arg;
int ret;
if (netdev->netdev_fd < 0) {
return -EAGAIN;
}
/* prepare the pcap argument to store the packet */
arg.size = size;
arg.data = data;
for (;;) {
ret = pcap_dispatch(netdev->pcap_handle, 1, proc_pkt, (u_char *)&arg);
if (ret > 0) {
return arg.retval; /* arg.retval < 0 is handled in the caller */
}
if (ret == -1) {
if (errno == EINTR) {
continue;
}
}
return -EAGAIN;
}
}
/*
* This function attempts to receive a packet from the specified network
* device. It is assumed that the network device is a tap device and the
* 'netdev_fd' member of the 'netdev' structure is initialized with the tap
* file descriptor.
*/
static int
netdev_bsd_recv_tap(struct netdev_bsd *netdev, void *data, size_t size)
{
if (netdev->netdev_fd < 0) {
return -EAGAIN;
}
for (;;) {
ssize_t retval = read(netdev->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->netdev.netdev_dev->name);
}
return -errno;
}
}
}
/*
* According with the nature of the device a different function must be called.
* If the device is the bridge local port the 'netdev_bsd_recv_tap' function
* must be called, otherwise the 'netdev_bsd_recv_system' function is called.
*
* type!="tap" ---> system device.
* type=="tap" && netdev_fd == tap_fd ---> internal tap device
* type=="tap" && netdev_fd != tap_fd ---> internal tap device
* opened as a system
* device.
*/
static int
netdev_bsd_recv(struct netdev *netdev_, void* data, size_t size)
{
struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
struct netdev_dev_bsd * netdev_dev =
netdev_dev_bsd_cast(netdev_get_dev(netdev_));
if (!strcmp(netdev_get_type(netdev_), "tap") &&
netdev->netdev_fd == netdev_dev->tap_fd) {
return netdev_bsd_recv_tap(netdev, data, size);
} else {
return netdev_bsd_recv_system(netdev, data, size);
}
}
/*
* 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_bsd_recv_wait(struct netdev *netdev_)
{
struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
if (netdev->netdev_fd >= 0) {
poll_fd_wait(netdev->netdev_fd, POLLIN);
}
}
/* Discards all packets waiting to be received from 'netdev'. */
static int
netdev_bsd_drain(struct netdev *netdev_)
{
struct ifreq ifr;
struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
strcpy(ifr.ifr_name, netdev_get_name(netdev_));
if (ioctl(netdev->netdev_fd, BIOCFLUSH, &ifr) == -1) {
VLOG_DBG_RL(&rl, "%s: ioctl(BIOCFLUSH) failed: %s",
netdev_get_name(netdev_), strerror(errno));
return errno;
}
return 0;
}
/*
* Send a packet on the specified network device. The device could be either a
* system or a tap device.
*/
static int
netdev_bsd_send(struct netdev *netdev_, const void *data, size_t size)
{
struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
struct netdev_dev_bsd * netdev_dev =
netdev_dev_bsd_cast(netdev_get_dev(netdev_));
if (netdev->netdev_fd < 0) {
return EPIPE;
}
for (;;) {
ssize_t retval;
if (!strcmp(netdev_get_type(netdev_), "tap") &&
netdev_dev->tap_fd == netdev->netdev_fd) {
retval = write(netdev->netdev_fd, data, size);
} else {
retval = pcap_inject(netdev->pcap_handle, data, size);
}
if (retval < 0) {
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().
*/
static void
netdev_bsd_send_wait(struct netdev *netdev_)
{
struct netdev_bsd *netdev = netdev_bsd_cast(netdev_);
if (netdev->netdev_fd < 0) { /* Nothing to do. */
return;
}
if (strcmp(netdev_get_type(netdev_), "tap")) {
poll_fd_wait(netdev->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_bsd_set_etheraddr(struct netdev *netdev_,
const uint8_t mac[ETH_ADDR_LEN])
{
struct netdev_dev_bsd *netdev_dev =
netdev_dev_bsd_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_), AF_LINK, ETH_ADDR_LEN,
mac);
if (!error) {
netdev_dev->cache_valid |= VALID_ETHERADDR;
memcpy(netdev_dev->etheraddr, mac, ETH_ADDR_LEN);
netdev_dev_bsd_changed(netdev_dev);
}
} 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_bsd_get_etheraddr(const struct netdev *netdev_,
uint8_t mac[ETH_ADDR_LEN])
{
struct netdev_dev_bsd *netdev_dev =
netdev_dev_bsd_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_bsd_get_mtu(const struct netdev *netdev_, int *mtup)
{
struct netdev_dev_bsd *netdev_dev =
netdev_dev_bsd_cast(netdev_get_dev(netdev_));
if (!(netdev_dev->cache_valid & VALID_MTU)) {
struct ifreq ifr;
int error;
error = netdev_bsd_do_ioctl(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;
}
static int
netdev_bsd_get_ifindex(const struct netdev *netdev)
{
int ifindex, error;
error = get_ifindex(netdev, &ifindex);
return error ? -error : ifindex;
}
static int
netdev_bsd_get_carrier(const struct netdev *netdev_, bool *carrier)
{
struct netdev_dev_bsd *netdev_dev =
netdev_dev_bsd_cast(netdev_get_dev(netdev_));
if (!(netdev_dev->cache_valid & VALID_CARRIER)) {
struct ifmediareq ifmr;
memset(&ifmr, 0, sizeof(ifmr));
strncpy(ifmr.ifm_name, netdev_get_name(netdev_), sizeof ifmr.ifm_name);
if (ioctl(af_inet_sock, SIOCGIFMEDIA, &ifmr) == -1) {
VLOG_DBG_RL(&rl, "%s: ioctl(SIOCGIFMEDIA) failed: %s",
netdev_get_name(netdev_), strerror(errno));
return errno;
}
netdev_dev->carrier = (ifmr.ifm_status & IFM_ACTIVE) == IFM_ACTIVE;
netdev_dev->cache_valid |= VALID_CARRIER;
/* If the interface doesn't report whether the media is active,
* just assume it is active. */
if ((ifmr.ifm_status & IFM_AVALID) == 0) {
netdev_dev->carrier = true;
}
}
*carrier = netdev_dev->carrier;
return 0;
}
/* Retrieves current device stats for 'netdev'. */
static int
netdev_bsd_get_stats(const struct netdev *netdev_, struct netdev_stats *stats)
{
int if_count, i;
int mib[6];
size_t len;
struct ifmibdata ifmd;
mib[0] = CTL_NET;
mib[1] = PF_LINK;
mib[2] = NETLINK_GENERIC;
mib[3] = IFMIB_SYSTEM;
mib[4] = IFMIB_IFCOUNT;
len = sizeof(if_count);
if (sysctl(mib, 5, &if_count, &len, (void *)0, 0) == -1) {
VLOG_DBG_RL(&rl, "%s: sysctl failed: %s",
netdev_get_name(netdev_), strerror(errno));
return errno;
}
mib[5] = IFDATA_GENERAL;
mib[3] = IFMIB_IFDATA;
len = sizeof(ifmd);
for (i = 1; i <= if_count; i++) {
mib[4] = i; //row
if (sysctl(mib, 6, &ifmd, &len, (void *)0, 0) == -1) {
VLOG_DBG_RL(&rl, "%s: sysctl failed: %s",
netdev_get_name(netdev_), strerror(errno));
return errno;
} else if (!strcmp(ifmd.ifmd_name, netdev_get_name(netdev_))) {
stats->rx_packets = ifmd.ifmd_data.ifi_ipackets;
stats->tx_packets = ifmd.ifmd_data.ifi_opackets;
stats->rx_bytes = ifmd.ifmd_data.ifi_ibytes;
stats->tx_bytes = ifmd.ifmd_data.ifi_obytes;
stats->rx_errors = ifmd.ifmd_data.ifi_ierrors;
stats->tx_errors = ifmd.ifmd_data.ifi_oerrors;
stats->rx_dropped = ifmd.ifmd_data.ifi_iqdrops;
stats->tx_dropped = 0;
stats->multicast = ifmd.ifmd_data.ifi_imcasts;
stats->collisions = ifmd.ifmd_data.ifi_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;
break;
}
}
return 0;
}
static uint32_t
netdev_bsd_parse_media(int media)
{
uint32_t supported = 0;
bool half_duplex = media & IFM_HDX ? true : false;
switch (IFM_SUBTYPE(media)) {
case IFM_10_2:
case IFM_10_5:
case IFM_10_STP:
case IFM_10_T:
supported |= half_duplex ? NETDEV_F_10MB_HD : NETDEV_F_10MB_FD;
supported |= NETDEV_F_COPPER;
break;
case IFM_10_FL:
supported |= half_duplex ? NETDEV_F_10MB_HD : NETDEV_F_10MB_FD;
supported |= NETDEV_F_FIBER;
break;
case IFM_100_T2:
case IFM_100_T4:
case IFM_100_TX:
case IFM_100_VG:
supported |= half_duplex ? NETDEV_F_100MB_HD : NETDEV_F_100MB_FD;
supported |= NETDEV_F_COPPER;
break;
case IFM_100_FX:
supported |= half_duplex ? NETDEV_F_100MB_HD : NETDEV_F_100MB_FD;
supported |= NETDEV_F_FIBER;
break;
case IFM_1000_CX:
case IFM_1000_T:
supported |= half_duplex ? NETDEV_F_1GB_HD : NETDEV_F_1GB_FD;
supported |= NETDEV_F_COPPER;
break;
case IFM_1000_LX:
case IFM_1000_SX:
supported |= half_duplex ? NETDEV_F_1GB_HD : NETDEV_F_1GB_FD;
supported |= NETDEV_F_FIBER;
break;
case IFM_10G_CX4:
supported |= NETDEV_F_10GB_FD;
supported |= NETDEV_F_COPPER;
break;
case IFM_10G_LR:
case IFM_10G_SR:
supported |= NETDEV_F_10GB_FD;
supported |= NETDEV_F_FIBER;
break;
default:
return 0;
}
if (IFM_SUBTYPE(media) == IFM_AUTO) {
supported |= NETDEV_F_AUTONEG;
}
/*
if (media & IFM_ETH_FMASK) {
supported |= NETDEV_F_PAUSE;
}
*/
return supported;
}
/*
* 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. On failure, all of the
* passed-in values are set to 0.
*/
static int
netdev_bsd_get_features(const struct netdev *netdev,
enum netdev_features *current, uint32_t *advertised,
enum netdev_features *supported, uint32_t *peer)
{
struct ifmediareq ifmr;
int *media_list;
int i;
int error;
/* XXX Look into SIOCGIFCAP instead of SIOCGIFMEDIA */
memset(&ifmr, 0, sizeof(ifmr));
strncpy(ifmr.ifm_name, netdev_get_name(netdev), sizeof ifmr.ifm_name);
/* We make two SIOCGIFMEDIA ioctl calls. The first to determine the
* number of supported modes, and a second with a buffer to retrieve
* them. */
if (ioctl(af_inet_sock, SIOCGIFMEDIA, &ifmr) == -1) {
VLOG_DBG_RL(&rl, "%s: ioctl(SIOCGIFMEDIA) failed: %s",
netdev_get_name(netdev), strerror(errno));
return errno;
}
media_list = xcalloc(ifmr.ifm_count, sizeof(int));
ifmr.ifm_ulist = media_list;
if (!IFM_TYPE(ifmr.ifm_current) & IFM_ETHER) {
VLOG_DBG_RL(&rl, "%s: doesn't appear to be ethernet",
netdev_get_name(netdev));
error = EINVAL;
goto cleanup;
}
if (ioctl(af_inet_sock, SIOCGIFMEDIA, &ifmr) == -1) {
VLOG_DBG_RL(&rl, "%s: ioctl(SIOCGIFMEDIA) failed: %s",
netdev_get_name(netdev), strerror(errno));
error = errno;
goto cleanup;
}
/* Current settings. */
*current = netdev_bsd_parse_media(ifmr.ifm_active);
/* Advertised features. */
*advertised = netdev_bsd_parse_media(ifmr.ifm_current);
/* Supported features. */
*supported = 0;
for (i = 0; i < ifmr.ifm_count; i++) {
*supported |= netdev_bsd_parse_media(ifmr.ifm_ulist[i]);
}
/* Peer advertisements. */
*peer = 0; /* XXX */
error = 0;
cleanup:
free(media_list);
return error;
}
/*
* If 'netdev' has an assigned IPv4 address, sets '*in4' to that address (if
* 'in4' is non-null) and returns true. Otherwise, returns false.
*/
static int
netdev_bsd_get_in4(const struct netdev *netdev_, struct in_addr *in4,
struct in_addr *netmask)
{
struct netdev_dev_bsd *netdev_dev =
netdev_dev_bsd_cast(netdev_get_dev(netdev_));
if (!(netdev_dev->cache_valid & VALID_IN4)) {
const struct sockaddr_in *sin;
struct ifreq ifr;
int error;
ifr.ifr_addr.sa_family = AF_INET;
error = netdev_bsd_do_ioctl(netdev_, &ifr,
SIOCGIFADDR, "SIOCGIFADDR");
if (error) {
return error;
}
sin = (struct sockaddr_in *) &ifr.ifr_addr;
netdev_dev->in4 = sin->sin_addr;
netdev_dev->cache_valid |= VALID_IN4;
error = netdev_bsd_do_ioctl(netdev_, &ifr,
SIOCGIFNETMASK, "SIOCGIFNETMASK");
if (error) {
return error;
}
*netmask = ((struct sockaddr_in*)&ifr.ifr_addr)->sin_addr;
}
*in4 = netdev_dev->in4;
return in4->s_addr == INADDR_ANY ? EADDRNOTAVAIL : 0;
}
/*
* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
* 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
* positive errno value.
*/
static int
netdev_bsd_set_in4(struct netdev *netdev_, struct in_addr addr,
struct in_addr mask)
{
struct netdev_dev_bsd *netdev_dev =
netdev_dev_bsd_cast(netdev_get_dev(netdev_));
int error;
error = do_set_addr(netdev_, SIOCSIFADDR, "SIOCSIFADDR", addr);
if (!error) {
netdev_dev->cache_valid |= VALID_IN4;
netdev_dev->in4 = addr;
if (addr.s_addr != INADDR_ANY) {
error = do_set_addr(netdev_, SIOCSIFNETMASK,
"SIOCSIFNETMASK", mask);
}
netdev_dev_bsd_changed(netdev_dev);
}
return error;
}
static int
netdev_bsd_get_in6(const struct netdev *netdev_, struct in6_addr *in6)
{
struct netdev_dev_bsd *netdev_dev =
netdev_dev_bsd_cast(netdev_get_dev(netdev_));
if (!(netdev_dev->cache_valid & VALID_IN6)) {
struct ifaddrs *ifa, *head;
struct sockaddr_in6 *sin6;
const char *netdev_name = netdev_get_name(netdev_);
if (getifaddrs(&head) != 0) {
VLOG_ERR("getifaddrs on %s device failed: %s", netdev_name,
strerror(errno));
return errno;
}
for (ifa = head; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_addr->sa_family == AF_INET6 &&
!strcmp(ifa->ifa_name, netdev_name)) {
sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
if (sin6) {
memcpy(&netdev_dev->in6, &sin6->sin6_addr, sin6->sin6_len);
netdev_dev->cache_valid |= VALID_IN6;
*in6 = netdev_dev->in6;
freeifaddrs(head);
return 0;
}
}
}
return EADDRNOTAVAIL;
}
*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;
make_in4_sockaddr(&ifr.ifr_addr, addr);
return netdev_bsd_do_ioctl(netdev, &ifr, ioctl_nr, ioctl_name);
}
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;
iff |= IFF_PPROMISC;
}
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_bsd_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);
netdev_dev_bsd_changed(netdev_dev_bsd_cast(netdev_get_dev(netdev)));
}
}
return error;
}
static unsigned int
netdev_bsd_change_seq(const struct netdev *netdev)
{
return netdev_dev_bsd_cast(netdev_get_dev(netdev))->change_seq;
}
const struct netdev_class netdev_bsd_class = {
"system",
netdev_bsd_init,
netdev_bsd_run,
netdev_bsd_wait,
netdev_bsd_create_system,
netdev_bsd_destroy,
NULL, /* get_config */
NULL, /* set_config */
NULL, /* get_tunnel_config */
netdev_bsd_open_system,
netdev_bsd_close,
netdev_bsd_listen,
netdev_bsd_recv,
netdev_bsd_recv_wait,
netdev_bsd_drain,
netdev_bsd_send,
netdev_bsd_send_wait,
netdev_bsd_set_etheraddr,
netdev_bsd_get_etheraddr,
netdev_bsd_get_mtu,
NULL, /* set_mtu */
netdev_bsd_get_ifindex,
netdev_bsd_get_carrier,
NULL, /* get_carrier_resets */
NULL, /* set_miimon_interval */
netdev_bsd_get_stats,
NULL, /* set_stats */
netdev_bsd_get_features,
NULL, /* set_advertisement */
NULL, /* set_policing */
NULL, /* get_qos_type */
NULL, /* get_qos_capabilities */
NULL, /* get_qos */
NULL, /* set_qos */
NULL, /* get_queue */
NULL, /* set_queue */
NULL, /* delete_queue */
NULL, /* get_queue_stats */
NULL, /* dump_queue */
NULL, /* dump_queue_stats */
netdev_bsd_get_in4,
netdev_bsd_set_in4,
netdev_bsd_get_in6,
NULL, /* add_router */
NULL, /* get_next_hop */
NULL, /* get_status */
NULL, /* arp_lookup */
netdev_bsd_update_flags,
netdev_bsd_change_seq
};
const struct netdev_class netdev_tap_class = {
"tap",
netdev_bsd_init,
netdev_bsd_run,
netdev_bsd_wait,
netdev_bsd_create_tap,
netdev_bsd_destroy,
NULL, /* get_config */
NULL, /* set_config */
NULL, /* get_tunnel_config */
netdev_bsd_open_system,
netdev_bsd_close,
netdev_bsd_listen,
netdev_bsd_recv,
netdev_bsd_recv_wait,
netdev_bsd_drain,
netdev_bsd_send,
netdev_bsd_send_wait,
netdev_bsd_set_etheraddr,
netdev_bsd_get_etheraddr,
netdev_bsd_get_mtu,
NULL, /* set_mtu */
netdev_bsd_get_ifindex,
netdev_bsd_get_carrier,
NULL, /* get_carrier_resets */
NULL, /* set_miimon_interval */
netdev_bsd_get_stats,
NULL, /* set_stats */
netdev_bsd_get_features,
NULL, /* set_advertisement */
NULL, /* set_policing */
NULL, /* get_qos_type */
NULL, /* get_qos_capabilities */
NULL, /* get_qos */
NULL, /* set_qos */
NULL, /* get_queue */
NULL, /* set_queue */
NULL, /* delete_queue */
NULL, /* get_queue_stats */
NULL, /* dump_queue */
NULL, /* dump_queue_stats */
netdev_bsd_get_in4,
netdev_bsd_set_in4,
netdev_bsd_get_in6,
NULL, /* add_router */
NULL, /* get_next_hop */
NULL, /* get_status */
NULL, /* arp_lookup */
netdev_bsd_update_flags,
netdev_bsd_change_seq
};
static void
destroy_tap(int fd, const char *name)
{
struct ifreq ifr;
close(fd);
strcpy(ifr.ifr_name, name);
/* XXX What to do if this call fails? */
ioctl(af_inet_sock, SIOCIFDESTROY, &ifr);
}
static int
get_flags(const struct netdev *netdev, int *flags)
{
struct ifreq ifr;
int error;
error = netdev_bsd_do_ioctl(netdev, &ifr, SIOCGIFFLAGS, "SIOCGIFFLAGS");
*flags = 0xFFFF0000 & (ifr.ifr_flagshigh << 16);
*flags |= 0x0000FFFF & ifr.ifr_flags;
return error;
}
static int
set_flags(struct netdev *netdev, int flags)
{
struct ifreq ifr;
ifr.ifr_flags = 0x0000FFFF & flags;
ifr.ifr_flagshigh = (0xFFFF0000 & flags) >> 16;
return netdev_bsd_do_ioctl(netdev, &ifr, SIOCSIFFLAGS, "SIOCSIFFLAGS");
}
static int
get_ifindex(const struct netdev *netdev_, int *ifindexp)
{
struct netdev_dev_bsd *netdev_dev =
netdev_dev_bsd_cast(netdev_get_dev(netdev_));
*ifindexp = 0;
if (!(netdev_dev->cache_valid & VALID_IFINDEX)) {
int ifindex = if_nametoindex(netdev_get_name(netdev_));
if (ifindex <= 0) {
return errno;
}
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 ifaddrs *head;
struct ifaddrs *ifa;
struct sockaddr_dl *sdl;
if (getifaddrs(&head) != 0) {
VLOG_ERR("getifaddrs on %s device failed: %s", netdev_name,
strerror(errno));
return errno;
}
for (ifa = head; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_addr->sa_family == AF_LINK) {
if (!strcmp(ifa->ifa_name, netdev_name)) {
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
if (sdl) {
memcpy(ea, LLADDR(sdl), sdl->sdl_alen);
freeifaddrs(head);
return 0;
}
}
}
}
VLOG_ERR("could not find ethernet address for %s device", netdev_name);
freeifaddrs(head);
return ENODEV;
}
static int
set_etheraddr(const char *netdev_name, int hwaddr_family,
int hwaddr_len, 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_addr.sa_family = hwaddr_family;
ifr.ifr_addr.sa_len = hwaddr_len;
memcpy(ifr.ifr_addr.sa_data, mac, hwaddr_len);
if (ioctl(af_inet_sock, SIOCSIFLLADDR, &ifr) < 0) {
VLOG_ERR("ioctl(SIOCSIFLLADDR) on %s device failed: %s",
netdev_name, strerror(errno));
return errno;
}
return 0;
}
static int
netdev_bsd_do_ioctl(const struct netdev *netdev, struct ifreq *ifr,
unsigned long cmd, const char *cmd_name)
{
strncpy(ifr->ifr_name, netdev_get_name(netdev), sizeof ifr->ifr_name);
if (ioctl(af_inet_sock, cmd, ifr) == -1) {
VLOG_DBG_RL(&rl, "%s: ioctl(%s) failed: %s",
netdev_get_name(netdev), cmd_name, strerror(errno));
return errno;
}
return 0;
}
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