#include <assert.h>
#include <errno.h>
-#include <fcntl.h>
-#include <arpa/inet.h>
#include <inttypes.h>
-#include <linux/if_tun.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 <net/if_arp.h>
-#include <net/if_packet.h>
-#include <net/route.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <string.h>
#include "dynamic-string.h"
#include "fatal-signal.h"
#include "list.h"
-#include "netlink.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"
-/* linux/if.h defines IFF_LOWER_UP, net/if.h doesn't.
- * net/if.h defines if_nameindex(), linux/if.h doesn't.
- * We can't include both headers, so define IFF_LOWER_UP ourselves. */
-#ifndef IFF_LOWER_UP
-#define IFF_LOWER_UP 0x10000
-#endif
-
-/* 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
-
#define THIS_MODULE VLM_netdev
#include "vlog.h"
-struct netdev {
- struct list node;
- char *name;
-
- /* File descriptors. For ordinary network devices, the two fds below are
- * the same; for tap devices, they differ. */
- int netdev_fd; /* Network device. */
- int tap_fd; /* TAP character device, if any, otherwise the
- * network device. */
-
- /* Cached network device information. */
- int ifindex; /* -1 if not known. */
- uint8_t etheraddr[ETH_ADDR_LEN];
- struct in6_addr in6;
- int speed;
- int mtu;
- int txqlen;
- int hwaddr_family;
-
- int save_flags; /* Initial device flags. */
- int changed_flags; /* Flags that we changed. */
-};
-
-/* Policy for RTNLGRP_LINK messages.
- *
- * There are *many* more fields in these messages, but currently we only care
- * about interface names. */
-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) },
+static const struct netdev_class *netdev_classes[] = {
+ &netdev_linux_class,
+ &netdev_tap_class,
};
+static int n_netdev_classes = ARRAY_SIZE(netdev_classes);
/* All open network devices. */
static struct list netdev_list = LIST_INITIALIZER(&netdev_list);
-/* An AF_INET socket (used for ioctl operations). */
-static int af_inet_sock = -1;
-
-/* NETLINK_ROUTE socket. */
-static struct nl_sock *rtnl_sock;
-
-/* 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 use_netlink_stats;
-
/* 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 void init_netdev(void);
-static int do_open_netdev(const char *name, int ethertype, int tap_fd,
- struct netdev **netdev_);
+static void restore_all_flags(void *aux);
static int restore_flags(struct netdev *netdev);
-static int get_flags(const char *netdev_name, int *flagsp);
-static int set_flags(const char *netdev_name, int flags);
-static int do_get_ifindex(const char *netdev_name);
-static int get_ifindex(const struct netdev *, int *ifindexp);
-static int get_etheraddr(const char *netdev_name, uint8_t ea[ETH_ADDR_LEN],
- int *hwaddr_familyp);
-static int set_etheraddr(const char *netdev_name, int hwaddr_family,
- const uint8_t[ETH_ADDR_LEN]);
-
-/* Obtains the IPv6 address for 'name' into 'in6'. */
-static void
-get_ipv6_address(const char *name, struct in6_addr *in6)
+
+/* Attempts to initialize the netdev module. Returns 0 if successful,
+ * otherwise a positive errno value.
+ *
+ * Calling this function is optional. If not called explicitly, it will
+ * automatically be called upon the first attempt to open a network device. */
+int
+netdev_initialize(void)
{
- FILE *file;
- char line[128];
-
- file = fopen("/proc/net/if_inet6", "r");
- if (file == NULL) {
- /* This most likely indicates that the host doesn't have IPv6 support,
- * so it's not really a failure condition.*/
- *in6 = in6addr_any;
- return;
- }
+ static int status = -1;
+ if (status < 0) {
+ int i, j;
+
+ fatal_signal_add_hook(restore_all_flags, NULL, true);
- while (fgets(line, sizeof line, file)) {
- uint8_t *s6 = in6->s6_addr;
- char ifname[16 + 1];
-
-#define X8 "%2"SCNx8
- if (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
- && !strcmp(name, ifname))
- {
- fclose(file);
- return;
+ status = 0;
+ for (i = j = 0; i < n_netdev_classes; i++) {
+ const struct netdev_class *class = netdev_classes[i];
+ if (class->init) {
+ int retval = class->init();
+ if (!retval) {
+ netdev_classes[j++] = class;
+ } else {
+ VLOG_ERR("failed to initialize %s network device "
+ "class: %s", class->name, strerror(retval));
+ if (!status) {
+ status = retval;
+ }
+ }
+ }
}
+ n_netdev_classes = j;
}
- *in6 = in6addr_any;
-
- fclose(file);
+ return status;
}
-static int
-do_ethtool(struct netdev *netdev, struct ethtool_cmd *ecmd,
- int cmd, const char *cmd_name)
+/* Performs periodic work needed by all the various kinds of netdevs.
+ *
+ * If your program opens any netdevs, it must call this function within its
+ * main poll loop. */
+void
+netdev_run(void)
{
- struct ifreq ifr;
-
- memset(&ifr, 0, sizeof ifr);
- strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
- ifr.ifr_data = (caddr_t) ecmd;
-
- ecmd->cmd = cmd;
- COVERAGE_INC(netdev_ethtool);
- if (ioctl(netdev->netdev_fd, SIOCETHTOOL, &ifr) == 0) {
- return 0;
- } else {
- if (errno != EOPNOTSUPP) {
- VLOG_WARN_RL(&rl, "ethtool command %s on network device %s "
- "failed: %s", cmd_name, netdev->name,
- strerror(errno));
- } else {
- /* The device doesn't support this operation. That's pretty
- * common, so there's no point in logging anything. */
+ int i;
+ for (i = 0; i < n_netdev_classes; i++) {
+ const struct netdev_class *class = netdev_classes[i];
+ if (class->run) {
+ class->run();
}
- return errno;
}
}
-static int
-do_get_features(struct netdev *netdev,
- uint32_t *current, uint32_t *advertised,
- uint32_t *supported, uint32_t *peer)
+/* Arranges for poll_block() to wake up when netdev_run() needs to be called.
+ *
+ * If your program opens any netdevs, it must call this function within its
+ * main poll loop. */
+void
+netdev_wait(void)
{
- struct ethtool_cmd ecmd;
- int error;
-
- *current = 0;
- *supported = 0;
- *advertised = 0;
- *peer = 0;
-
- memset(&ecmd, 0, sizeof ecmd);
- error = do_ethtool(netdev, &ecmd, ETHTOOL_GSET, "ETHTOOL_GSET");
- if (error) {
- return error;
- }
-
- 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;
- }
-
- /* Set the advertised features */
- 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;
- }
-
- /* Set the current features */
- 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;
- }
-
- if (ecmd.port == PORT_TP) {
- *current |= OFPPF_COPPER;
- }
- else if (ecmd.port == PORT_FIBRE) {
- *current |= OFPPF_FIBER;
- }
-
- if (ecmd.autoneg) {
- *current |= OFPPF_AUTONEG;
+ int i;
+ for (i = 0; i < n_netdev_classes; i++) {
+ const struct netdev_class *class = netdev_classes[i];
+ if (class->wait) {
+ class->wait();
+ }
}
- return 0;
}
/* Opens the network device named 'name' (e.g. "eth0") and returns zero if
* the 'enum netdev_pseudo_ethertype' values to receive frames in one of those
* categories. */
int
-netdev_open(const char *name, int ethertype, struct netdev **netdevp)
-{
- if (!strncmp(name, "tap:", 4)) {
- return netdev_open_tap(name + 4, netdevp);
- } else {
- return do_open_netdev(name, ethertype, -1, netdevp);
- }
-}
-
-/* Opens a TAP virtual network device. If 'name' is a nonnull, non-empty
- * string, attempts to assign that name to the TAP device (failing if the name
- * is already in use); otherwise, a name is automatically assigned. Returns
- * zero if successful, otherwise a positive errno value. On success, sets
- * '*netdevp' to the new network device, otherwise to null. */
-int
-netdev_open_tap(const char *name, struct netdev **netdevp)
-{
- static const char tap_dev[] = "/dev/net/tun";
- struct ifreq ifr;
- int error;
- int tap_fd;
-
- tap_fd = open(tap_dev, O_RDWR);
- if (tap_fd < 0) {
- ovs_error(errno, "opening \"%s\" failed", tap_dev);
- return errno;
- }
-
- memset(&ifr, 0, sizeof ifr);
- ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
- if (name) {
- strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
- }
- if (ioctl(tap_fd, TUNSETIFF, &ifr) < 0) {
- int error = errno;
- ovs_error(error, "ioctl(TUNSETIFF) on \"%s\" failed", tap_dev);
- close(tap_fd);
- return error;
- }
-
- error = set_nonblocking(tap_fd);
- if (error) {
- ovs_error(error, "set_nonblocking on \"%s\" failed", tap_dev);
- close(tap_fd);
- return error;
- }
-
- error = do_open_netdev(ifr.ifr_name, NETDEV_ETH_TYPE_NONE, tap_fd,
- netdevp);
- if (error) {
- close(tap_fd);
- }
- return error;
-}
-
-static int
-do_open_netdev(const char *name, int ethertype, int tap_fd,
- struct netdev **netdev_)
+netdev_open(const char *name_, int ethertype, struct netdev **netdevp)
{
- int netdev_fd;
- struct sockaddr_ll sll;
- struct ifreq ifr;
- int ifindex = -1;
- uint8_t etheraddr[ETH_ADDR_LEN];
- struct in6_addr in6;
- int mtu;
- int txqlen;
- int hwaddr_family;
+ char *name = xstrdup(name_);
+ char *prefix, *suffix, *colon;
+ struct netdev *netdev = NULL;
int error;
- struct netdev *netdev;
+ int i;
- init_netdev();
- *netdev_ = NULL;
- COVERAGE_INC(netdev_open);
-
- /* Create raw socket. */
- netdev_fd = socket(PF_PACKET, SOCK_RAW,
- htons(ethertype == NETDEV_ETH_TYPE_NONE ? 0
- : ethertype == NETDEV_ETH_TYPE_ANY ? ETH_P_ALL
- : ethertype == NETDEV_ETH_TYPE_802_2 ? ETH_P_802_2
- : ethertype));
- if (netdev_fd < 0) {
- return errno;
+ netdev_initialize();
+ colon = strchr(name, ':');
+ if (colon) {
+ *colon = '\0';
+ prefix = name;
+ suffix = colon + 1;
+ } else {
+ prefix = "";
+ suffix = name;
}
- if (ethertype != NETDEV_ETH_TYPE_NONE) {
- /* Set non-blocking mode. */
- error = set_nonblocking(netdev_fd);
- if (error) {
- goto error_already_set;
- }
-
- /* Get ethernet device index. */
- ifindex = do_get_ifindex(name);
- if (ifindex < 0) {
- return -ifindex;
- }
-
- /* 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) {
- VLOG_ERR("bind to %s failed: %s", name, strerror(errno));
- 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_already_set;
+ for (i = 0; i < n_netdev_classes; i++) {
+ const struct netdev_class *class = netdev_classes[i];
+ if (!strcmp(prefix, class->prefix)) {
+ error = class->open(name_, suffix, ethertype, &netdev);
+ goto exit;
}
}
+ error = EAFNOSUPPORT;
- /* Get MAC address. */
- error = get_etheraddr(name, etheraddr, &hwaddr_family);
- if (error) {
- goto error_already_set;
- }
-
- /* Get MTU. */
- strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
- if (ioctl(netdev_fd, SIOCGIFMTU, &ifr) < 0) {
- VLOG_ERR("ioctl(SIOCGIFMTU) on %s device failed: %s",
- name, strerror(errno));
- goto error;
- }
- mtu = ifr.ifr_mtu;
-
- /* Get TX queue length. */
- if (ioctl(netdev_fd, SIOCGIFTXQLEN, &ifr) < 0) {
- VLOG_ERR("ioctl(SIOCGIFTXQLEN) on %s device failed: %s",
- name, strerror(errno));
- goto error;
- }
- txqlen = ifr.ifr_qlen;
-
- get_ipv6_address(name, &in6);
-
- /* Allocate network device. */
- netdev = xmalloc(sizeof *netdev);
- netdev->name = xstrdup(name);
- netdev->ifindex = ifindex;
- netdev->txqlen = txqlen;
- netdev->hwaddr_family = hwaddr_family;
- netdev->netdev_fd = netdev_fd;
- netdev->tap_fd = tap_fd < 0 ? netdev_fd : tap_fd;
- memcpy(netdev->etheraddr, etheraddr, sizeof etheraddr);
- netdev->mtu = mtu;
- netdev->in6 = in6;
-
- /* Save flags to restore at close or exit. */
- error = get_flags(netdev->name, &netdev->save_flags);
- if (error) {
- goto error_already_set;
- }
- netdev->changed_flags = 0;
- fatal_signal_block();
- list_push_back(&netdev_list, &netdev->node);
- fatal_signal_unblock();
-
- /* Success! */
- *netdev_ = netdev;
- return 0;
-
-error:
- error = errno;
-error_already_set:
- close(netdev_fd);
- if (tap_fd >= 0) {
- close(tap_fd);
- }
+exit:
+ *netdevp = error ? NULL : netdev;
return error;
}
netdev_close(struct netdev *netdev)
{
if (netdev) {
- /* Bring down interface and drop promiscuous mode, if we brought up
- * the interface or enabled promiscuous mode. */
+ char *name;
int error;
+
+ /* Restore flags that we changed, if any. */
fatal_signal_block();
error = restore_flags(netdev);
list_remove(&netdev->node);
}
/* Free. */
- free(netdev->name);
- close(netdev->netdev_fd);
- if (netdev->netdev_fd != netdev->tap_fd) {
- close(netdev->tap_fd);
+ name = netdev->name;
+ netdev->class->close(netdev);
+ free(name);
+ }
+}
+
+/* Returns true if a network device named 'name' exists and may be opened,
+ * otherwise false. */
+bool
+netdev_exists(const char *name)
+{
+ struct netdev *netdev;
+ int error;
+
+ error = netdev_open(name, NETDEV_ETH_TYPE_NONE, &netdev);
+ if (!error) {
+ netdev_close(netdev);
+ return true;
+ } else {
+ if (error != ENODEV) {
+ VLOG_WARN("failed to open network device %s: %s",
+ name, strerror(error));
}
- free(netdev);
+ return false;
}
}
-/* Pads 'buffer' out with zero-bytes to the minimum valid length of an
- * Ethernet packet, if necessary. */
-static void
-pad_to_minimum_length(struct ofpbuf *buffer)
+/* Initializes 'svec' with a list of the names of all known network devices. */
+int
+netdev_enumerate(struct svec *svec)
{
- if (buffer->size < ETH_TOTAL_MIN) {
- ofpbuf_put_zeros(buffer, ETH_TOTAL_MIN - buffer->size);
+ int error;
+ int i;
+
+ svec_init(svec);
+
+ netdev_initialize();
+
+ error = 0;
+ for (i = 0; i < n_netdev_classes; i++) {
+ const struct netdev_class *class = netdev_classes[i];
+ if (class->enumerate) {
+ int retval = class->enumerate(svec);
+ if (retval) {
+ VLOG_WARN("failed to enumerate %s network devices: %s",
+ class->name, strerror(retval));
+ if (!error) {
+ error = retval;
+ }
+ }
+ }
}
+ return error;
}
/* Attempts to receive a packet from 'netdev' into 'buffer', which the caller
int
netdev_recv(struct netdev *netdev, struct ofpbuf *buffer)
{
- ssize_t n_bytes;
+ int retval;
assert(buffer->size == 0);
assert(ofpbuf_tailroom(buffer) >= ETH_TOTAL_MIN);
- do {
- n_bytes = read(netdev->tap_fd,
- ofpbuf_tail(buffer), ofpbuf_tailroom(buffer));
- } while (n_bytes < 0 && errno == EINTR);
- if (n_bytes < 0) {
- if (errno != EAGAIN) {
- VLOG_WARN_RL(&rl, "error receiving Ethernet packet on %s: %s",
- netdev->name, strerror(errno));
- }
- return errno;
- } else {
+
+ retval = netdev->class->recv(netdev,
+ buffer->data, ofpbuf_tailroom(buffer));
+ if (retval >= 0) {
COVERAGE_INC(netdev_received);
- buffer->size += n_bytes;
-
- /* When the kernel internally sends out an Ethernet frame on an
- * interface, it gives us a copy *before* padding the frame to the
- * minimum length. Thus, when it sends out something like an ARP
- * request, we see a too-short frame. So pad it out to the minimum
- * length. */
- pad_to_minimum_length(buffer);
+ buffer->size += retval;
+ if (buffer->size < ETH_TOTAL_MIN) {
+ ofpbuf_put_zeros(buffer, ETH_TOTAL_MIN - buffer->size);
+ }
return 0;
+ } else {
+ return -retval;
}
}
void
netdev_recv_wait(struct netdev *netdev)
{
- poll_fd_wait(netdev->tap_fd, POLLIN);
+ netdev->class->recv_wait(netdev);
}
/* Discards all packets waiting to be received from 'netdev'. */
int
netdev_drain(struct netdev *netdev)
{
- if (netdev->tap_fd != netdev->netdev_fd) {
- drain_fd(netdev->tap_fd, netdev->txqlen);
- return 0;
- } else {
- return drain_rcvbuf(netdev->netdev_fd);
- }
+ return netdev->class->drain(netdev);
}
/* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
int
netdev_send(struct netdev *netdev, const struct ofpbuf *buffer)
{
- ssize_t n_bytes;
-
- do {
- n_bytes = write(netdev->tap_fd, buffer->data, buffer->size);
- } while (n_bytes < 0 && errno == EINTR);
-
- if (n_bytes < 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 != EAGAIN) {
- VLOG_WARN_RL(&rl, "error sending Ethernet packet on %s: %s",
- netdev->name, strerror(errno));
- }
- return errno;
- } else if (n_bytes != buffer->size) {
- VLOG_WARN_RL(&rl,
- "send partial Ethernet packet (%d bytes of %zu) on %s",
- (int) n_bytes, buffer->size, netdev->name);
- return EMSGSIZE;
- } else {
+ int error = netdev->class->send(netdev, buffer->data, buffer->size);
+ if (!error) {
COVERAGE_INC(netdev_sent);
- return 0;
}
+ return error;
}
/* Registers with the poll loop to wake up from the next call to poll_block()
void
netdev_send_wait(struct netdev *netdev)
{
- if (netdev->tap_fd == netdev->netdev_fd) {
- poll_fd_wait(netdev->tap_fd, POLLOUT);
- } else {
- /* TAP device always accepts packets.*/
- poll_immediate_wake();
- }
+ return netdev->class->send_wait(netdev);
}
/* Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful,
int
netdev_set_etheraddr(struct netdev *netdev, const uint8_t mac[ETH_ADDR_LEN])
{
- int error = set_etheraddr(netdev->name, netdev->hwaddr_family, mac);
- if (!error) {
- memcpy(netdev->etheraddr, mac, ETH_ADDR_LEN);
- }
- return error;
+ return netdev->class->set_etheraddr(netdev, mac);
}
+/* Retrieves 'netdev''s MAC address. If successful, returns 0 and copies the
+ * the MAC address into 'mac'. On failure, returns a positive errno value and
+ * clears 'mac' to all-zeros. */
int
-netdev_nodev_set_etheraddr(const char *name, const uint8_t mac[ETH_ADDR_LEN])
+netdev_get_etheraddr(const struct netdev *netdev, uint8_t mac[ETH_ADDR_LEN])
{
- init_netdev();
- return set_etheraddr(name, ARPHRD_ETHER, mac);
-}
-
-/* Returns a pointer to 'netdev''s MAC address. The caller must not modify or
- * free the returned buffer. */
-const uint8_t *
-netdev_get_etheraddr(const struct netdev *netdev)
-{
- return netdev->etheraddr;
+ return netdev->class->get_etheraddr(netdev, mac);
}
/* Returns the name of the network device that 'netdev' represents,
return netdev->name;
}
-/* 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. */
+/* Retrieves the MTU of 'netdev'. The MTU is the maximum size of transmitted
+ * (and received) packets, in bytes, not including the hardware header; thus,
+ * this is typically 1500 bytes for Ethernet devices.
+ *
+ * If successful, returns 0 and stores the MTU size in '*mtup'. On failure,
+ * returns a positive errno value and stores ETH_PAYLOAD_MAX (1500) in
+ * '*mtup'. */
int
-netdev_get_mtu(const struct netdev *netdev)
+netdev_get_mtu(const struct netdev *netdev, int *mtup)
{
- return netdev->mtu;
+ int error = netdev->class->get_mtu(netdev, mtup);
+ if (error) {
+ VLOG_WARN_RL(&rl, "failed to retrieve MTU for network device %s: %s",
+ netdev_get_name(netdev), strerror(error));
+ *mtup = ETH_PAYLOAD_MAX;
+ }
+ return error;
}
/* Stores the features supported by 'netdev' into each of '*current',
uint32_t *supported, uint32_t *peer)
{
uint32_t dummy[4];
- return do_get_features(netdev,
- current ? current : &dummy[0],
- advertised ? advertised : &dummy[1],
- supported ? supported : &dummy[2],
- peer ? peer : &dummy[3]);
+ return netdev->class->get_features(netdev,
+ current ? current : &dummy[0],
+ advertised ? advertised : &dummy[1],
+ supported ? supported : &dummy[2],
+ peer ? peer : &dummy[3]);
}
+/* Set the features advertised by 'netdev' to 'advertise'. Returns 0 if
+ * successful, otherwise a positive errno value. */
int
netdev_set_advertisements(struct netdev *netdev, uint32_t advertise)
{
- struct ethtool_cmd ecmd;
- int error;
-
- memset(&ecmd, 0, sizeof ecmd);
- error = do_ethtool(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 do_ethtool(netdev, &ecmd, ETHTOOL_SSET, "ETHTOOL_SSET");
-}
-
-/* If 'netdev' has an assigned IPv4 address, sets '*in4' to that address
- * and '*mask' to the netmask (if they are non-null) and returns true.
- * Otherwise, returns false. */
-bool
-netdev_nodev_get_in4(const char *netdev_name, struct in_addr *in4,
- struct in_addr *mask)
-{
- struct ifreq ifr;
- struct in_addr ip = { INADDR_ANY };
-
- init_netdev();
-
- strncpy(ifr.ifr_name, netdev_name, sizeof ifr.ifr_name);
- ifr.ifr_addr.sa_family = AF_INET;
- COVERAGE_INC(netdev_get_in4);
- if (ioctl(af_inet_sock, SIOCGIFADDR, &ifr) == 0) {
- struct sockaddr_in *sin = (struct sockaddr_in *) &ifr.ifr_addr;
- ip = sin->sin_addr;
- } else {
- VLOG_DBG_RL(&rl, "%s: ioctl(SIOCGIFADDR) failed: %s",
- netdev_name, strerror(errno));
- }
- if (in4) {
- *in4 = ip;
- }
-
- if (mask) {
- if (ioctl(af_inet_sock, SIOCGIFNETMASK, &ifr) == 0) {
- struct sockaddr_in *sin = (struct sockaddr_in *) &ifr.ifr_addr;
- *mask = sin->sin_addr;
- } else {
- VLOG_DBG_RL(&rl, "%s: ioctl(SIOCGIFNETMASK) failed: %s",
- netdev_name, strerror(errno));
- }
- }
-
- return ip.s_addr != INADDR_ANY;
+ return (netdev->class->set_advertisements
+ ? netdev->class->set_advertisements(netdev, advertise)
+ : EOPNOTSUPP);
}
-bool
-netdev_get_in4(const struct netdev *netdev, struct in_addr *in4, struct
- in_addr *mask)
-{
- return netdev_nodev_get_in4(netdev->name, in4, mask);
-}
-
-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 sock,
- int ioctl_nr, const char *ioctl_name, struct in_addr addr)
+/* If 'netdev' has an assigned IPv4 address, sets '*address' to that address
+ * and '*netmask' to its netmask and returns 0. Otherwise, returns a positive
+ * errno value and sets '*address' to 0 (INADDR_ANY).
+ *
+ * The following error values have well-defined meanings:
+ *
+ * - EADDRNOTAVAIL: 'netdev' has no assigned IPv4 address.
+ *
+ * - EOPNOTSUPP: No IPv4 network stack attached to 'netdev'.
+ *
+ * 'address' or 'netmask' or both may be null, in which case the address or netmask
+ * is not reported. */
+int
+netdev_get_in4(const struct netdev *netdev,
+ struct in_addr *address_, struct in_addr *netmask_)
{
- struct ifreq ifr;
+ struct in_addr address;
+ struct in_addr netmask;
int error;
- strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
- make_in4_sockaddr(&ifr.ifr_addr, addr);
- COVERAGE_INC(netdev_set_in4);
- error = ioctl(sock, ioctl_nr, &ifr) < 0 ? errno : 0;
- if (error) {
- VLOG_WARN("ioctl(%s): %s", ioctl_name, strerror(error));
+ error = (netdev->class->get_in4
+ ? netdev->class->get_in4(netdev, &address, &netmask)
+ : EOPNOTSUPP);
+ if (address_) {
+ address_->s_addr = error ? 0 : address.s_addr;
+ }
+ if (netmask_) {
+ netmask_->s_addr = error ? 0 : netmask.s_addr;
}
return error;
}
int
netdev_set_in4(struct netdev *netdev, struct in_addr addr, struct in_addr mask)
{
- int error;
-
- error = do_set_addr(netdev, af_inet_sock,
- SIOCSIFADDR, "SIOCSIFADDR", addr);
- if (!error && addr.s_addr != INADDR_ANY) {
- error = do_set_addr(netdev, af_inet_sock,
- SIOCSIFNETMASK, "SIOCSIFNETMASK", mask);
- }
- return error;
+ return (netdev->class->set_in4
+ ? netdev->class->set_in4(netdev, addr, mask)
+ : EOPNOTSUPP);
}
-/* Adds 'router' as a default IP gateway. */
+/* Adds 'router' as a default IP gateway for the TCP/IP stack that corresponds
+ * to 'netdev'. */
int
-netdev_add_router(struct in_addr router)
+netdev_add_router(struct netdev *netdev, 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;
+ return (netdev->class->add_router
+ ? netdev->class->add_router(netdev, router)
+ : EOPNOTSUPP);
+}
+
+/* Looks up the next hop for 'host' for the TCP/IP stack that corresponds to
+ * 'netdev'. If a route cannot not be determined, sets '*next_hop' to 0,
+ * '*netdev_name' to null, and returns a positive errno value. Otherwise, if a
+ * next hop is found, stores the next hop gateway's address (0 if 'host' is on
+ * a directly connected network) in '*next_hop' and a copy of the name of the
+ * device to reach 'host' in '*netdev_name', and returns 0. The caller is
+ * responsible for freeing '*netdev_name' (by calling free()). */
+int
+netdev_get_next_hop(const struct netdev *netdev,
+ const struct in_addr *host, struct in_addr *next_hop,
+ char **netdev_name)
+{
+ int error = (netdev->class->get_next_hop
+ ? netdev->class->get_next_hop(host, next_hop, netdev_name)
+ : EOPNOTSUPP);
if (error) {
- VLOG_WARN("ioctl(SIOCADDRT): %s", strerror(error));
+ next_hop->s_addr = 0;
+ *netdev_name = NULL;
}
return error;
}
-/* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address (if
- * 'in6' is non-null) and returns true. Otherwise, returns false. */
-bool
-netdev_get_in6(const struct netdev *netdev, struct in6_addr *in6)
-{
- if (in6) {
- *in6 = netdev->in6;
- }
- return memcmp(&netdev->in6, &in6addr_any, sizeof netdev->in6) != 0;
-}
-
-/* Obtains the current flags for 'netdev' and stores them into '*flagsp'.
- * Returns 0 if successful, otherwise a positive errno value. On failure,
- * stores 0 into '*flagsp'. */
+/* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address and
+ * returns 0. Otherwise, returns a positive errno value and sets '*in6' to
+ * all-zero-bits (in6addr_any).
+ *
+ * The following error values have well-defined meanings:
+ *
+ * - EADDRNOTAVAIL: 'netdev' has no assigned IPv6 address.
+ *
+ * - EOPNOTSUPP: No IPv6 network stack attached to 'netdev'.
+ *
+ * 'in6' may be null, in which case the address itself is not reported. */
int
-netdev_get_flags(const struct netdev *netdev, enum netdev_flags *flagsp)
+netdev_get_in6(const struct netdev *netdev, struct in6_addr *in6)
{
- return netdev_nodev_get_flags(netdev->name, flagsp);
-}
+ struct in6_addr dummy;
+ int error;
-static int
-nd_to_iff_flags(enum netdev_flags nd)
-{
- int iff = 0;
- if (nd & NETDEV_UP) {
- iff |= IFF_UP;
+ error = (netdev->class->get_in6
+ ? netdev->class->get_in6(netdev, in6 ? in6 : &dummy)
+ : EOPNOTSUPP);
+ if (error && in6) {
+ memset(in6, 0, sizeof *in6);
}
- if (nd & NETDEV_PROMISC) {
- iff |= IFF_PROMISC;
- }
- return iff;
+ return error;
}
/* On 'netdev', turns off the flags in 'off' and then turns on the flags in
* successful, otherwise a positive errno value. */
static int
do_update_flags(struct netdev *netdev, enum netdev_flags off,
- enum netdev_flags on, bool permanent)
+ enum netdev_flags on, enum netdev_flags *old_flagsp,
+ bool permanent)
{
- int old_flags, new_flags;
+ enum netdev_flags old_flags;
int error;
- error = get_flags(netdev->name, &old_flags);
+ error = netdev->class->update_flags(netdev, off & ~on, on, &old_flags);
if (error) {
- return error;
- }
-
- new_flags = (old_flags & ~nd_to_iff_flags(off)) | nd_to_iff_flags(on);
- if (!permanent) {
- netdev->changed_flags |= new_flags ^ old_flags;
+ VLOG_WARN_RL(&rl, "failed to %s flags for network device %s: %s",
+ off || on ? "set" : "get", netdev_get_name(netdev),
+ strerror(error));
+ old_flags = 0;
+ } else if ((off || on) && !permanent) {
+ enum netdev_flags new_flags = (old_flags & ~off) | on;
+ enum netdev_flags changed_flags = old_flags ^ new_flags;
+ if (changed_flags) {
+ if (!netdev->changed_flags) {
+ netdev->save_flags = old_flags;
+ }
+ netdev->changed_flags |= changed_flags;
+ }
}
- if (new_flags != old_flags) {
- error = set_flags(netdev->name, new_flags);
+ if (old_flagsp) {
+ *old_flagsp = old_flags;
}
return error;
}
+/* Obtains the current flags for 'netdev' and stores them into '*flagsp'.
+ * Returns 0 if successful, otherwise a positive errno value. On failure,
+ * stores 0 into '*flagsp'. */
+int
+netdev_get_flags(const struct netdev *netdev_, enum netdev_flags *flagsp)
+{
+ struct netdev *netdev = (struct netdev *) netdev_;
+ return do_update_flags(netdev, 0, 0, flagsp, false);
+}
+
/* Sets the flags for 'netdev' to 'flags'.
* If 'permanent' is true, the changes will persist; otherwise, they
* will be reverted when 'netdev' is closed or the program exits.
netdev_set_flags(struct netdev *netdev, enum netdev_flags flags,
bool permanent)
{
- return do_update_flags(netdev, -1, flags, permanent);
+ return do_update_flags(netdev, -1, flags, NULL, permanent);
}
/* Turns on the specified 'flags' on 'netdev'.
netdev_turn_flags_on(struct netdev *netdev, enum netdev_flags flags,
bool permanent)
{
- return do_update_flags(netdev, 0, flags, permanent);
+ return do_update_flags(netdev, 0, flags, NULL, permanent);
}
/* Turns off the specified 'flags' on 'netdev'.
netdev_turn_flags_off(struct netdev *netdev, enum netdev_flags flags,
bool permanent)
{
- return do_update_flags(netdev, flags, 0, permanent);
+ return do_update_flags(netdev, flags, 0, NULL, permanent);
}
/* 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'. */
-int
-netdev_nodev_arp_lookup(const char *netdev_name, uint32_t ip,
- uint8_t mac[ETH_ADDR_LEN])
-{
- struct arpreq r;
- struct sockaddr_in *pa;
- int retval;
-
- init_netdev();
-
- memset(&r, 0, sizeof r);
- pa = (struct sockaddr_in *) &r.arp_pa;
- pa->sin_family = AF_INET;
- pa->sin_addr.s_addr = ip;
- pa->sin_port = 0;
- r.arp_ha.sa_family = ARPHRD_ETHER;
- r.arp_flags = 0;
- strncpy(r.arp_dev, netdev_name, 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_name, IP_ARGS(&ip), strerror(retval));
- }
- return retval;
-}
-
+ * ENXIO indicates that there is no ARP table entry for 'ip' on 'netdev'. */
int
-netdev_arp_lookup(const struct netdev *netdev, uint32_t ip,
- uint8_t mac[ETH_ADDR_LEN])
-{
- return netdev_nodev_arp_lookup(netdev->name, ip, mac);
-}
-
-static int
-get_stats_via_netlink(int ifindex, struct netdev_stats *stats)
+netdev_arp_lookup(const struct netdev *netdev,
+ uint32_t ip, uint8_t mac[ETH_ADDR_LEN])
{
- 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;
-
- 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);
+ int error = (netdev->class->arp_lookup
+ ? netdev->class->arp_lookup(netdev, ip, mac)
+ : EOPNOTSUPP);
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");
- 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;
-
- 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;
+ memset(mac, 0, ETH_ADDR_LEN);
}
-
- 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;
+ return error;
}
+/* Sets 'carrier' to true if carrier is active (link light is on) on
+ * 'netdev'. */
int
netdev_get_carrier(const struct netdev *netdev, bool *carrier)
{
- return netdev_nodev_get_carrier(netdev->name, carrier);
-}
-
-int
-netdev_nodev_get_carrier(const char *netdev_name, bool *carrier)
-{
- char line[8];
- int retval;
- int error;
- char *fn;
- int fd;
-
- *carrier = false;
-
- fn = xasprintf("/sys/class/net/%s/carrier", netdev_name);
- 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_close;
- } else if (retval == 0) {
- error = EPROTO;
- VLOG_WARN_RL(&rl, "%s: unexpected end of file", fn);
- goto exit_close;
- }
-
- 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_close;
+ int error = (netdev->class->get_carrier
+ ? netdev->class->get_carrier(netdev, carrier)
+ : EOPNOTSUPP);
+ if (error) {
+ *carrier = false;
}
- *carrier = line[0] != '0';
- error = 0;
-
-exit_close:
- close(fd);
-exit:
- free(fn);
return error;
}
+/* Retrieves current device stats for 'netdev'. */
int
netdev_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
{
int error;
COVERAGE_INC(netdev_get_stats);
- if (use_netlink_stats) {
- int ifindex;
-
- error = get_ifindex(netdev, &ifindex);
- if (!error) {
- error = get_stats_via_netlink(ifindex, stats);
- }
- } else {
- error = get_stats_via_proc(netdev->name, stats);
- }
-
+ error = (netdev->class->get_stats
+ ? netdev->class->get_stats(netdev, stats)
+ : EOPNOTSUPP);
if (error) {
memset(stats, 0xff, sizeof *stats);
}
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"
-
-/* Attempts to set input rate limiting (policing) policy. */
-int
-netdev_nodev_set_policing(const char *netdev_name, uint32_t kbits_rate,
- uint32_t kbits_burst)
-{
- char command[1024];
-
- init_netdev();
-
- COVERAGE_INC(netdev_set_policing);
- if (kbits_rate) {
- if (!kbits_burst) {
- /* Default to 10 kilobits if not specified. */
- kbits_burst = 10;
- }
-
- /* 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);
- }
-
- 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;
- }
- } else {
- snprintf(command, sizeof(command), POLICE_DEL_CMD, netdev_name);
- if (system(command) == -1) {
- VLOG_WARN_RL(&rl, "%s: problem removing policing", netdev_name);
- }
- }
-
- return 0;
-}
-
+/* Attempts to set input rate limiting (policing) policy, such that up to
+ * 'kbits_rate' kbps of traffic is accepted, with a maximum accumulative burst
+ * size of 'kbits' kb. */
int
netdev_set_policing(struct netdev *netdev, uint32_t kbits_rate,
uint32_t kbits_burst)
{
- return netdev_nodev_set_policing(netdev->name, kbits_rate, kbits_burst);
+ return (netdev->class->set_policing
+ ? netdev->class->set_policing(netdev, kbits_rate, kbits_burst)
+ : EOPNOTSUPP);
}
-/* Initializes 'svec' with a list of the names of all known network devices. */
-void
-netdev_enumerate(struct svec *svec)
+/* If 'netdev' is 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. */
+int
+netdev_get_vlan_vid(const struct netdev *netdev, int *vlan_vid)
{
- struct if_nameindex *names;
-
- svec_init(svec);
- 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);
- } else {
- VLOG_WARN("could not obtain list of network device names: %s",
- strerror(errno));
+ int error = (netdev->class->get_vlan_vid
+ ? netdev->class->get_vlan_vid(netdev, vlan_vid)
+ : ENOENT);
+ if (error) {
+ *vlan_vid = 0;
}
+ return error;
}
-/* Attempts to locate a device based on its IPv4 address. The caller
- * may provide a hint as to the device by setting 'netdev_name' to a
- * likely device name. This string must be malloc'd, since if it is
- * not correct then it will be freed. If there is no hint, then
- * 'netdev_name' must be the NULL pointer.
- *
- * If the device is found, the return value will be true and 'netdev_name'
- * contains the device's name as a string, which the caller is responsible
- * for freeing. If the device is not found, the return value is false. */
-bool
-netdev_find_dev_by_in4(const struct in_addr *in4, char **netdev_name)
+/* Returns a network device that has 'in4' as its IP address, if one exists,
+ * otherwise a null pointer. */
+struct netdev *
+netdev_find_dev_by_in4(const struct in_addr *in4)
{
- int i;
- struct in_addr dev_in4;
+ struct netdev *netdev;
struct svec dev_list;
+ size_t i;
- /* Check the hint first. */
- if (*netdev_name && (netdev_nodev_get_in4(*netdev_name, &dev_in4, NULL))
- && (dev_in4.s_addr == in4->s_addr)) {
- return true;
- }
-
- free(*netdev_name);
- *netdev_name = NULL;
netdev_enumerate(&dev_list);
-
- for (i=0; i<dev_list.n; i++) {
- if ((netdev_nodev_get_in4(dev_list.names[i], &dev_in4, NULL))
- && (dev_in4.s_addr == in4->s_addr)) {
- *netdev_name = xstrdup(dev_list.names[i]);
- svec_destroy(&dev_list);
- return true;
+ for (i = 0; i < dev_list.n; i++) {
+ const char *name = dev_list.names[i];
+ struct in_addr dev_in4;
+
+ if (!netdev_open(name, NETDEV_ETH_TYPE_NONE, &netdev)
+ && !netdev_get_in4(netdev, &dev_in4, NULL)
+ && dev_in4.s_addr == in4->s_addr) {
+ goto exit;
}
+ netdev_close(netdev);
}
+ netdev = NULL;
+exit:
svec_destroy(&dev_list);
- return false;
+ return netdev;
}
-
-/* Looks up the next hop for 'ip'. If the next hop can be found, the
- * address is stored in 'next_hop'. If a gateway is not required to
- * reach 'ip', zero is stored in 'next_hop'. In either case, zero is
- * returned and a copy of the name of the device to reach 'ip' is stored
- * in 'netdev_name', which the caller is responsible for freeing. If a
- * route could not be determined, a positive errno is returned. */
-int
-netdev_get_next_hop(const struct in_addr *host, struct in_addr *next_hop,
- char **netdev_name)
+\f
+/* Initializes 'netdev' as a netdev named 'name' of the specified 'class'.
+ *
+ * This function adds 'netdev' to a netdev-owned linked list, so it is very
+ * important that 'netdev' only be freed after calling netdev_close(). */
+void
+netdev_init(struct netdev *netdev, const char *name,
+ const struct netdev_class *class)
{
- 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;
+ netdev->class = class;
+ netdev->name = xstrdup(name);
+ netdev->save_flags = 0;
+ netdev->changed_flags = 0;
+ list_push_back(&netdev_list, &netdev->node);
}
-/* Obtains the current flags for the network device named 'netdev_name' and
- * stores them into '*flagsp'. Returns 0 if successful, otherwise a positive
- * errno value. On error, stores 0 into '*flagsp'.
- *
- * If only device flags are needed, this is more efficient than calling
- * netdev_open(), netdev_get_flags(), netdev_close(). */
-int
-netdev_nodev_get_flags(const char *netdev_name, enum netdev_flags *flagsp)
+/* Initializes 'notifier' as a netdev notifier for 'netdev', for which
+ * notification will consist of calling 'cb', with auxiliary data 'aux'. */
+void
+netdev_notifier_init(struct netdev_notifier *notifier, struct netdev *netdev,
+ void (*cb)(struct netdev_notifier *), void *aux)
{
- int error, flags;
-
- init_netdev();
-
- *flagsp = 0;
- error = get_flags(netdev_name, &flags);
- if (error) {
- return error;
- }
-
- if (flags & IFF_UP) {
- *flagsp |= NETDEV_UP;
- }
- if (flags & IFF_PROMISC) {
- *flagsp |= NETDEV_PROMISC;
- }
- return 0;
+ notifier->netdev = netdev;
+ notifier->cb = cb;
+ notifier->aux = aux;
}
+\f
+/* Tracks changes in the status of a set of network devices. */
+struct netdev_monitor {
+ struct shash polled_netdevs;
+ struct shash changed_netdevs;
+};
-int
-netdev_nodev_get_etheraddr(const char *netdev_name, uint8_t mac[6])
+/* Creates and returns a new structure for monitor changes in the status of
+ * network devices. */
+struct netdev_monitor *
+netdev_monitor_create(void)
{
- init_netdev();
-
- return get_etheraddr(netdev_name, mac, NULL);
+ struct netdev_monitor *monitor = xmalloc(sizeof *monitor);
+ shash_init(&monitor->polled_netdevs);
+ shash_init(&monitor->changed_netdevs);
+ return monitor;
}
-/* 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. */
-int
-netdev_get_vlan_vid(const char *netdev_name, int *vlan_vid)
+/* Destroys 'monitor'. */
+void
+netdev_monitor_destroy(struct netdev_monitor *monitor)
{
- 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 (monitor) {
+ struct shash_node *node;
- 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);
+ SHASH_FOR_EACH (node, &monitor->polled_netdevs) {
+ struct netdev_notifier *notifier = node->data;
+ notifier->netdev->class->poll_remove(notifier);
}
- 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;
+ shash_destroy(&monitor->polled_netdevs);
+ shash_destroy(&monitor->changed_netdevs);
+ free(monitor);
}
-
- error = 0;
-
-done:
- free(fn);
- if (stream) {
- fclose(stream);
- }
- ds_destroy(&line);
- if (error) {
- *vlan_vid = -1;
- }
- return error;
}
-\f
-static void restore_all_flags(void *aux);
-/* Set up a signal hook to restore network device flags on program
- * termination. */
static void
-init_netdev(void)
+netdev_monitor_cb(struct netdev_notifier *notifier)
{
- static bool inited;
- if (!inited) {
- int ifindex;
- int error;
-
- inited = true;
-
- fatal_signal_add_hook(restore_all_flags, NULL, true);
+ struct netdev_monitor *monitor = notifier->aux;
+ const char *name = netdev_get_name(notifier->netdev);
+ if (!shash_find(&monitor->changed_netdevs, name)) {
+ shash_add(&monitor->changed_netdevs, name, NULL);
+ }
+}
- af_inet_sock = socket(AF_INET, SOCK_DGRAM, 0);
- if (af_inet_sock < 0) {
- ovs_fatal(errno, "socket(AF_INET)");
+/* Attempts to add 'netdev' as a netdev monitored by 'monitor'. Returns 0 if
+ * successful, otherwise a positive errno value.
+ *
+ * Adding a given 'netdev' to a monitor multiple times is equivalent to adding
+ * it once. */
+int
+netdev_monitor_add(struct netdev_monitor *monitor, struct netdev *netdev)
+{
+ const char *netdev_name = netdev_get_name(netdev);
+ int error = 0;
+ if (!shash_find(&monitor->polled_netdevs, netdev_name)
+ && netdev->class->poll_add)
+ {
+ struct netdev_notifier *notifier;
+ error = netdev->class->poll_add(netdev, netdev_monitor_cb, monitor,
+ ¬ifier);
+ if (!error) {
+ assert(notifier->netdev == netdev);
+ shash_add(&monitor->polled_netdevs, netdev_name, notifier);
}
+ }
+ return error;
+}
- error = nl_sock_create(NETLINK_ROUTE, 0, 0, 0, &rtnl_sock);
- if (error) {
- ovs_fatal(error, "socket(AF_NETLINK, NETLINK_ROUTE)");
+/* Removes 'netdev' from the set of netdevs monitored by 'monitor'. (This has
+ * no effect if 'netdev' is not in the set of devices monitored by
+ * 'monitor'.) */
+void
+netdev_monitor_remove(struct netdev_monitor *monitor, struct netdev *netdev)
+{
+ const char *netdev_name = netdev_get_name(netdev);
+ struct shash_node *node;
+
+ node = shash_find(&monitor->polled_netdevs, netdev_name);
+ if (node) {
+ /* Cancel future notifications. */
+ struct netdev_notifier *notifier = node->data;
+ netdev->class->poll_remove(notifier);
+ shash_delete(&monitor->polled_netdevs, node);
+
+ /* Drop any pending notification. */
+ node = shash_find(&monitor->changed_netdevs, netdev_name);
+ if (node) {
+ shash_delete(&monitor->changed_netdevs, node);
}
+ }
+}
- /* Decide on the netdev_get_stats() implementation to use. Netlink is
- * preferable, so if that works, we'll use it. */
- ifindex = do_get_ifindex("lo");
- if (ifindex < 0) {
- VLOG_WARN("failed to get ifindex for lo, "
- "obtaining netdev stats from proc");
- use_netlink_stats = false;
- } else {
- struct netdev_stats stats;
- error = get_stats_via_netlink(ifindex, &stats);
- if (!error) {
- VLOG_DBG("obtaining netdev stats via rtnetlink");
- use_netlink_stats = 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));
- use_netlink_stats = false;
- }
- }
+/* Checks for changes to netdevs in the set monitored by 'monitor'. If any of
+ * the attributes (Ethernet address, carrier status, speed or peer-advertised
+ * speed, flags, etc.) of a network device monitored by 'monitor' has changed,
+ * sets '*devnamep' to the name of a device that has changed and returns 0.
+ * The caller is responsible for freeing '*devnamep' (with free()).
+ *
+ * If no devices have changed, sets '*devnamep' to NULL and returns EAGAIN.
+ */
+int
+netdev_monitor_poll(struct netdev_monitor *monitor, char **devnamep)
+{
+ struct shash_node *node = shash_first(&monitor->changed_netdevs);
+ if (!node) {
+ *devnamep = NULL;
+ return EAGAIN;
+ } else {
+ *devnamep = xstrdup(node->name);
+ shash_delete(&monitor->changed_netdevs, node);
+ return 0;
}
}
+/* Registers with the poll loop to wake up from the next call to poll_block()
+ * when netdev_monitor_poll(monitor) would indicate that a device has
+ * changed. */
+void
+netdev_monitor_poll_wait(const struct netdev_monitor *monitor)
+{
+ if (!shash_is_empty(&monitor->changed_netdevs)) {
+ poll_immediate_wake();
+ } else {
+ /* XXX Nothing needed here for netdev_linux, but maybe other netdev
+ * classes need help. */
+ }
+}
+\f
/* Restore the network device flags on 'netdev' to those that were active
* before we changed them. Returns 0 if successful, otherwise a positive
* errno value.
static int
restore_flags(struct netdev *netdev)
{
- struct ifreq ifr;
- int restore_flags;
-
- /* Get current flags. */
- strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
- COVERAGE_INC(netdev_get_flags);
- if (ioctl(netdev->netdev_fd, SIOCGIFFLAGS, &ifr) < 0) {
- return errno;
- }
-
- /* Restore flags that we might have changed, if necessary. */
- restore_flags = netdev->changed_flags & (IFF_PROMISC | IFF_UP);
- if ((ifr.ifr_flags ^ netdev->save_flags) & restore_flags) {
- ifr.ifr_flags &= ~restore_flags;
- ifr.ifr_flags |= netdev->save_flags & restore_flags;
- COVERAGE_INC(netdev_set_flags);
- if (ioctl(netdev->netdev_fd, SIOCSIFFLAGS, &ifr) < 0) {
- return errno;
- }
+ if (netdev->changed_flags) {
+ enum netdev_flags restore = netdev->save_flags & netdev->changed_flags;
+ enum netdev_flags old_flags;
+ return netdev->class->update_flags(netdev,
+ netdev->changed_flags & ~restore,
+ restore, &old_flags);
}
-
return 0;
}
restore_flags(netdev);
}
}
-
-static int
-get_flags(const char *netdev_name, int *flags)
-{
- struct ifreq ifr;
- strncpy(ifr.ifr_name, netdev_name, sizeof ifr.ifr_name);
- COVERAGE_INC(netdev_get_flags);
- if (ioctl(af_inet_sock, SIOCGIFFLAGS, &ifr) < 0) {
- VLOG_ERR("ioctl(SIOCGIFFLAGS) on %s device failed: %s",
- netdev_name, strerror(errno));
- return errno;
- }
- *flags = ifr.ifr_flags;
- return 0;
-}
-
-static int
-set_flags(const char *netdev_name, int flags)
-{
- struct ifreq ifr;
- strncpy(ifr.ifr_name, netdev_name, sizeof ifr.ifr_name);
- ifr.ifr_flags = flags;
- COVERAGE_INC(netdev_set_flags);
- if (ioctl(af_inet_sock, SIOCSIFFLAGS, &ifr) < 0) {
- VLOG_ERR("ioctl(SIOCSIFFLAGS) on %s device failed: %s",
- netdev_name, strerror(errno));
- return errno;
- }
- return 0;
-}
-
-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)
-{
- *ifindexp = 0;
- if (netdev->ifindex < 0) {
- int ifindex = do_get_ifindex(netdev->name);
- if (ifindex < 0) {
- return -ifindex;
- }
- ((struct netdev *) netdev)->ifindex = ifindex;
- }
- *ifindexp = netdev->ifindex;
- return 0;
-}
-
-static int
-get_etheraddr(const char *netdev_name, uint8_t ea[ETH_ADDR_LEN],
- int *hwaddr_familyp)
-{
- struct ifreq ifr;
-
- 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;
- }
- if (hwaddr_familyp) {
- int hwaddr_family = ifr.ifr_hwaddr.sa_family;
- *hwaddr_familyp = hwaddr_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;
-}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff