flow.h \
hash.h \
list.h \
+ netdev.h \
netlink-protocol.h \
netlink.h \
ofp-print.h \
--- /dev/null
+/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
+ * Junior University
+ *
+ * We are making the OpenFlow specification and associated documentation
+ * (Software) available for public use and benefit with the expectation
+ * that others will use, modify and enhance the Software and contribute
+ * those enhancements back to the community. However, since we would
+ * like to make the Software available for broadest use, with as few
+ * restrictions as possible permission is hereby granted, free of
+ * charge, to any person obtaining a copy of this Software to deal in
+ * the Software under the copyrights without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * The name and trademarks of copyright holder(s) may NOT be used in
+ * advertising or publicity pertaining to the Software or any
+ * derivatives without specific, written prior permission.
+ */
+
+/* Generic interface to network devices.
+ *
+ * Currently, there is a single implementation of this interface that supports
+ * Linux. The interface should be generic enough to be implementable on other
+ * operating systems as well. */
+
+#ifndef NETDEV_H
+#define NETDEV_H 1
+
+#include <stdbool.h>
+#include <stdint.h>
+
+struct buffer;
+
+struct netdev;
+int netdev_open(const char *name, struct netdev **);
+void netdev_close(struct netdev *);
+int netdev_recv(struct netdev *, struct buffer *);
+void netdev_recv_wait(struct netdev *);
+int netdev_send(struct netdev *, struct buffer *);
+const uint8_t *netdev_get_etheraddr(const struct netdev *);
+const char *netdev_get_name(const struct netdev *);
+int netdev_get_mtu(const struct netdev *);
+int netdev_get_speed(const struct netdev *);
+uint32_t netdev_get_features(const struct netdev *);
+
+#endif /* netdev.h */
flow.c \
hash.c \
list.c \
+ netdev.c \
ofp-print.c \
poll-loop.c \
queue.c \
--- /dev/null
+/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
+ * Junior University
+ *
+ * We are making the OpenFlow specification and associated documentation
+ * (Software) available for public use and benefit with the expectation
+ * that others will use, modify and enhance the Software and contribute
+ * those enhancements back to the community. However, since we would
+ * like to make the Software available for broadest use, with as few
+ * restrictions as possible permission is hereby granted, free of
+ * charge, to any person obtaining a copy of this Software to deal in
+ * the Software under the copyrights without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * The name and trademarks of copyright holder(s) may NOT be used in
+ * advertising or publicity pertaining to the Software or any
+ * derivatives without specific, written prior permission.
+ */
+
+#include "netdev.h"
+
+#include <assert.h>
+#include <errno.h>
+#include <arpa/inet.h>
+#include <inttypes.h>
+#include <linux/types.h>
+#include <linux/ethtool.h>
+#include <linux/sockios.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 <netinet/in.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "list.h"
+#include "fatal-signal.h"
+#include "buffer.h"
+#include "openflow.h"
+#include "packets.h"
+#include "poll-loop.h"
+
+#define THIS_MODULE VLM_netdev
+#include "vlog.h"
+
+struct netdev {
+ struct list node;
+ char *name;
+ int fd;
+ uint8_t etheraddr[ETH_ADDR_LEN];
+ int speed;
+ int mtu;
+ uint32_t features;
+ int save_flags;
+};
+
+static struct list netdev_list = LIST_INITIALIZER(&netdev_list);
+
+static void init_netdev(void);
+static int restore_flags(struct netdev *netdev);
+
+/* Check whether device NAME has an IPv4 address assigned to it and, if so, log
+ * an error. */
+static void
+check_ipv4_address(const char *name)
+{
+ int sock;
+ struct ifreq ifr;
+
+ sock = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock < 0) {
+ VLOG_WARN("socket(AF_INET): %s", strerror(errno));
+ return;
+ }
+
+ strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
+ ifr.ifr_addr.sa_family = AF_INET;
+ if (ioctl(sock, SIOCGIFADDR, &ifr) == 0) {
+ VLOG_ERR("%s device has assigned IP address %s", name,
+ inet_ntoa(((struct sockaddr_in*) &ifr.ifr_addr)->sin_addr));
+ }
+
+ close(sock);
+}
+
+/* Check whether device NAME has an IPv6 address assigned to it and, if so, log
+ * an error. */
+static void
+check_ipv6_address(const char *name)
+{
+ FILE *file;
+ char line[128];
+
+ file = fopen("/proc/net/if_inet6", "r");
+ if (file == NULL) {
+ return;
+ }
+
+ while (fgets(line, sizeof line, file)) {
+ struct in6_addr in6;
+ 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))
+ {
+ char in6_name[INET6_ADDRSTRLEN + 1];
+ inet_ntop(AF_INET6, &in6, in6_name, sizeof in6_name);
+ VLOG_ERR("%s device has assigned IPv6 address %s",
+ name, in6_name);
+ }
+ }
+
+ fclose(file);
+}
+
+static void
+do_ethtool(struct netdev *netdev)
+{
+ struct ifreq ifr;
+ struct ethtool_cmd ecmd;
+
+ netdev->speed = 0;
+ netdev->features = 0;
+
+ memset(&ifr, 0, sizeof ifr);
+ strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
+ ifr.ifr_data = (caddr_t) &ecmd;
+
+ memset(&ecmd, 0, sizeof ecmd);
+ ecmd.cmd = ETHTOOL_GSET;
+ if (ioctl(netdev->fd, SIOCETHTOOL, &ifr) == 0) {
+ if (ecmd.supported & SUPPORTED_10baseT_Half) {
+ netdev->features |= OFPPF_10MB_HD;
+ }
+ if (ecmd.supported & SUPPORTED_10baseT_Full) {
+ netdev->features |= OFPPF_10MB_FD;
+ }
+ if (ecmd.supported & SUPPORTED_100baseT_Half) {
+ netdev->features |= OFPPF_100MB_HD;
+ }
+ if (ecmd.supported & SUPPORTED_100baseT_Full) {
+ netdev->features |= OFPPF_100MB_FD;
+ }
+ if (ecmd.supported & SUPPORTED_1000baseT_Half) {
+ netdev->features |= OFPPF_1GB_HD;
+ }
+ if (ecmd.supported & SUPPORTED_1000baseT_Full) {
+ netdev->features |= OFPPF_1GB_FD;
+ }
+ /* 10Gbps half-duplex doesn't exist... */
+ if (ecmd.supported & SUPPORTED_10000baseT_Full) {
+ netdev->features |= OFPPF_10GB_FD;
+ }
+
+ switch (ecmd.speed) {
+ case SPEED_10:
+ netdev->speed = 10;
+ break;
+
+ case SPEED_100:
+ netdev->speed = 100;
+ break;
+
+ case SPEED_1000:
+ netdev->speed = 1000;
+ break;
+
+ case SPEED_2500:
+ netdev->speed = 2500;
+ break;
+
+ case SPEED_10000:
+ netdev->speed = 10000;
+ break;
+ }
+ } else {
+ VLOG_DBG("ioctl(SIOCETHTOOL) failed: %s", strerror(errno));
+ }
+}
+
+/* Opens the network device named 'name' (e.g. "eth0") and returns zero if
+ * successful, otherwise a positive errno value. On success, sets '*netdev'
+ * to the new network device, otherwise to null. */
+int
+netdev_open(const char *name, struct netdev **netdev_)
+{
+ int fd;
+ struct sockaddr sa;
+ struct ifreq ifr;
+ unsigned int ifindex;
+ socklen_t rcvbuf_len;
+ size_t rcvbuf;
+ uint8_t etheraddr[ETH_ADDR_LEN];
+ int mtu;
+ int error;
+ struct netdev *netdev;
+
+ *netdev_ = NULL;
+ init_netdev();
+
+ /* Create raw socket.
+ *
+ * We have to use SOCK_PACKET, despite its deprecation, because only
+ * SOCK_PACKET lets us set the hardware source address of outgoing
+ * packets. */
+ fd = socket(PF_PACKET, SOCK_PACKET, htons(ETH_P_ALL));
+ if (fd < 0) {
+ return errno;
+ }
+
+ /* Bind to specific ethernet device. */
+ memset(&sa, 0, sizeof sa);
+ sa.sa_family = AF_UNSPEC;
+ strncpy((char *) sa.sa_data, name, sizeof sa.sa_data);
+ if (bind(fd, &sa, sizeof sa) < 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 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. There is no way to know how long the receive queue is,
+ * but we know that the total number of bytes queued does not exceed the
+ * receive buffer size, so we pull packets until none are left or we've
+ * read that many bytes. */
+ rcvbuf_len = sizeof rcvbuf;
+ if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, &rcvbuf_len) < 0) {
+ VLOG_ERR("getsockopt(SO_RCVBUF) on %s device failed: %s",
+ name, strerror(errno));
+ goto error;
+ }
+ while (rcvbuf > 0) {
+ char buffer;
+ ssize_t n_bytes = recv(fd, &buffer, 1, MSG_TRUNC | MSG_DONTWAIT);
+ if (n_bytes <= 0) {
+ break;
+ }
+ rcvbuf -= n_bytes;
+ }
+
+ /* Get ethernet device index. */
+ strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
+ if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0) {
+ VLOG_ERR("ioctl(SIOCGIFINDEX) on %s device failed: %s",
+ name, strerror(errno));
+ goto error;
+ }
+ ifindex = ifr.ifr_ifindex;
+
+ /* Get MAC address. */
+ if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
+ VLOG_ERR("ioctl(SIOCGIFHWADDR) on %s device failed: %s",
+ name, strerror(errno));
+ goto error;
+ }
+ if (ifr.ifr_hwaddr.sa_family != AF_UNSPEC
+ && ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
+ VLOG_WARN("%s device has unknown hardware address family %d",
+ name, (int) ifr.ifr_hwaddr.sa_family);
+ }
+ memcpy(etheraddr, ifr.ifr_hwaddr.sa_data, sizeof etheraddr);
+
+ /* Get MTU. */
+ if (ioctl(fd, SIOCGIFMTU, &ifr) < 0) {
+ VLOG_ERR("ioctl(SIOCGIFMTU) on %s device failed: %s",
+ name, strerror(errno));
+ goto error;
+ }
+ mtu = ifr.ifr_mtu;
+
+ /* Allocate network device. */
+ netdev = xmalloc(sizeof *netdev);
+ netdev->name = xstrdup(name);
+ netdev->fd = fd;
+ memcpy(netdev->etheraddr, etheraddr, sizeof etheraddr);
+ netdev->mtu = mtu;
+
+ /* Get speed, features. */
+ do_ethtool(netdev);
+
+ /* Save flags to restore at close or exit. */
+ if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
+ VLOG_ERR("ioctl(SIOCGIFFLAGS) on %s device failed: %s",
+ name, strerror(errno));
+ goto error;
+ }
+ netdev->save_flags = ifr.ifr_flags;
+ fatal_signal_block();
+ list_push_back(&netdev_list, &netdev->node);
+ fatal_signal_unblock();
+
+ /* Bring up interface and set promiscuous mode. */
+ ifr.ifr_flags |= IFF_PROMISC | IFF_UP;
+ if (ioctl(fd, SIOCSIFFLAGS, &ifr) < 0) {
+ error = errno;
+ VLOG_ERR("failed to set promiscuous mode on %s device: %s",
+ name, strerror(errno));
+ netdev_close(netdev);
+ return error;
+ }
+
+ /* Complain to administrator if any IP addresses are assigned to the
+ * interface. We warn about this because packets received for that IP
+ * address will be processed both by the kernel TCP/IP stack and by us as a
+ * switch, which produces poor results. */
+ check_ipv4_address(name);
+ check_ipv6_address(name);
+
+ /* Success! */
+ *netdev_ = netdev;
+ return 0;
+
+error:
+ error = errno;
+ close(fd);
+ return error;
+}
+
+/* Closes and destroys 'netdev'. */
+void
+netdev_close(struct netdev *netdev)
+{
+ if (netdev) {
+ /* Bring down interface and drop promiscuous mode, if we brought up
+ * the interface or enabled promiscuous mode. */
+ int error;
+ fatal_signal_block();
+ error = restore_flags(netdev);
+ list_remove(&netdev->node);
+ fatal_signal_unblock();
+ if (error) {
+ VLOG_WARN("failed to restore network device flags on %s: %s",
+ netdev->name, strerror(error));
+ }
+
+ /* Free. */
+ free(netdev->name);
+ close(netdev->fd);
+ free(netdev);
+ }
+}
+
+/* Pads 'buffer' out with zero-bytes to the minimum valid length of an
+ * Ethernet packet, if necessary. */
+static void
+pad_to_minimum_length(struct buffer *buffer)
+{
+ if (buffer->size < ETH_TOTAL_MIN) {
+ size_t shortage = ETH_TOTAL_MIN - buffer->size;
+ memset(buffer_put_uninit(buffer, shortage), 0, shortage);
+ }
+}
+
+/* Attempts to receive a packet from 'netdev' into 'buffer', which the caller
+ * must have initialized with sufficient room for the packet. The space
+ * required to receive any packet is ETH_HEADER_LEN bytes, plus VLAN_HEADER_LEN
+ * bytes, plus the device's MTU (which may be retrieved via netdev_get_mtu()).
+ * (Some devices do not allow for a VLAN header, in which case VLAN_HEADER_LEN
+ * need not be included.)
+ *
+ * If a packet is successfully retrieved, returns 0. In this case 'buffer' is
+ * guaranteed to contain at least ETH_TOTAL_MIN bytes. Otherwise, returns a
+ * positive errno value. Returns EAGAIN immediately if no packet is ready to
+ * be returned.
+ */
+int
+netdev_recv(struct netdev *netdev, struct buffer *buffer)
+{
+ ssize_t n_bytes;
+
+ assert(buffer->size == 0);
+ assert(buffer_tailroom(buffer) >= ETH_TOTAL_MIN);
+ do {
+ n_bytes = recv(netdev->fd,
+ buffer_tail(buffer), buffer_tailroom(buffer),
+ MSG_DONTWAIT);
+ } while (n_bytes < 0 && errno == EINTR);
+ if (n_bytes < 0) {
+ if (errno != EAGAIN) {
+ VLOG_WARN("error receiving Ethernet packet on %s: %s",
+ strerror(errno), netdev->name);
+ }
+ return errno;
+ } else {
+ 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);
+ return 0;
+ }
+}
+
+/* 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'. */
+void
+netdev_recv_wait(struct netdev *netdev)
+{
+ poll_fd_wait(netdev->fd, POLLIN);
+}
+
+/* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
+ * errno value. Returns EAGAIN without blocking if the packet cannot be queued
+ * immediately. Returns EMSGSIZE if a partial packet was transmitted or if
+ * the packet is too big to transmit on the device.
+ *
+ * The kernel maintains a packet transmission queue, so the caller is not
+ * expected to do additional queuing of packets. */
+int
+netdev_send(struct netdev *netdev, struct buffer *buffer)
+{
+ ssize_t n_bytes;
+ const struct eth_header *eh;
+ struct sockaddr_pkt spkt;
+
+ /* Ensure packet is long enough. (Although all incoming packets are at
+ * least ETH_TOTAL_MIN bytes long, we could have trimmed some data off a
+ * minimum-size packet, e.g. by dropping a vlan header.)
+ *
+ * The kernel does not require this, but it ensures that we always access
+ * valid memory in grabbing the sockaddr below. */
+ pad_to_minimum_length(buffer);
+
+ /* Construct packet sockaddr, which SOCK_PACKET requires. */
+ spkt.spkt_family = AF_PACKET;
+ strncpy((char *) spkt.spkt_device, netdev->name, sizeof spkt.spkt_device);
+ eh = buffer_at_assert(buffer, 0, sizeof *eh);
+ spkt.spkt_protocol = eh->eth_type;
+
+ do {
+ n_bytes = sendto(netdev->fd, buffer->data, buffer->size, 0,
+ (const struct sockaddr *) &spkt, sizeof spkt);
+ } 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("error sending Ethernet packet on %s: %s",
+ netdev->name, strerror(errno));
+ }
+ return errno;
+ } else if (n_bytes != buffer->size) {
+ VLOG_WARN("send partial Ethernet packet (%d bytes of %zu) on %s",
+ (int) n_bytes, buffer->size, netdev->name);
+ return EMSGSIZE;
+ } else {
+ return 0;
+ }
+}
+
+/* Registers with the poll loop to wake up from the next call to poll_block()
+ * when the packet transmission queue has sufficient room to transmit a packet
+ * with netdev_send().
+ *
+ * The kernel maintains a packet transmission queue, so the client is not
+ * expected to do additional queuing of packets. Thus, this function is
+ * unlikely to ever be used. It is included for completeness. */
+void
+netdev_send_wait(struct netdev *netdev)
+{
+ poll_fd_wait(netdev->fd, POLLOUT);
+}
+
+/* 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;
+}
+
+/* Returns the name of the network device that 'netdev' represents,
+ * e.g. "eth0". The caller must not modify or free the returned string. */
+const char *
+netdev_get_name(const struct netdev *netdev)
+{
+ 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. */
+int
+netdev_get_mtu(const struct netdev *netdev)
+{
+ return netdev->mtu;
+}
+
+/* Returns the current speed of the network device that 'netdev' represents, in
+ * megabits per second, or 0 if the speed is unknown. */
+int
+netdev_get_speed(const struct netdev *netdev)
+{
+ return netdev->speed;
+}
+
+/* Returns the features supported by 'netdev', as a bitmap of bits from enum
+ * ofp_phy_port, in host byte order. */
+uint32_t
+netdev_get_features(const struct netdev *netdev)
+{
+ return netdev->features;
+}
+\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)
+{
+ static bool inited;
+ if (!inited) {
+ inited = true;
+ fatal_signal_add_hook(restore_all_flags, NULL);
+ }
+}
+
+/* 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.
+ *
+ * To avoid reentry, the caller must ensure that fatal signals are blocked. */
+static int
+restore_flags(struct netdev *netdev)
+{
+ struct ifreq ifr;
+
+ /* Get current flags. */
+ strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
+ if (ioctl(netdev->fd, SIOCGIFFLAGS, &ifr) < 0) {
+ return errno;
+ }
+
+ /* Restore flags that we might have changed, if necessary. */
+ if ((ifr.ifr_flags ^ netdev->save_flags) & (IFF_PROMISC | IFF_UP)) {
+ ifr.ifr_flags &= ~(IFF_PROMISC | IFF_UP);
+ ifr.ifr_flags |= netdev->save_flags & (IFF_PROMISC | IFF_UP);
+ if (ioctl(netdev->fd, SIOCSIFFLAGS, &ifr) < 0) {
+ return errno;
+ }
+ }
+
+ return 0;
+}
+
+/* Retores all the flags on all network devices that we modified. Called from
+ * a signal handler, so it does not attempt to report error conditions. */
+static void
+restore_all_flags(void *aux UNUSED)
+{
+ struct netdev *netdev;
+ LIST_FOR_EACH (netdev, struct netdev, node, &netdev_list) {
+ restore_flags(netdev);
+ }
+}
crc32.h \
datapath.c \
datapath.h \
- netdev.c \
- netdev.h \
switch.c \
switch-flow.c \
switch-flow.h \
+++ /dev/null
-/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
- * Junior University
- *
- * We are making the OpenFlow specification and associated documentation
- * (Software) available for public use and benefit with the expectation
- * that others will use, modify and enhance the Software and contribute
- * those enhancements back to the community. However, since we would
- * like to make the Software available for broadest use, with as few
- * restrictions as possible permission is hereby granted, free of
- * charge, to any person obtaining a copy of this Software to deal in
- * the Software under the copyrights without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sublicense, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice shall be
- * included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- *
- * The name and trademarks of copyright holder(s) may NOT be used in
- * advertising or publicity pertaining to the Software or any
- * derivatives without specific, written prior permission.
- */
-
-#include "netdev.h"
-
-#include <assert.h>
-#include <errno.h>
-#include <arpa/inet.h>
-#include <inttypes.h>
-#include <linux/types.h>
-#include <linux/ethtool.h>
-#include <linux/sockios.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 <netinet/in.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "list.h"
-#include "fatal-signal.h"
-#include "buffer.h"
-#include "openflow.h"
-#include "packets.h"
-#include "poll-loop.h"
-
-#define THIS_MODULE VLM_netdev
-#include "vlog.h"
-
-struct netdev {
- struct list node;
- char *name;
- int fd;
- uint8_t etheraddr[ETH_ADDR_LEN];
- int speed;
- int mtu;
- uint32_t features;
- int save_flags;
-};
-
-static struct list netdev_list = LIST_INITIALIZER(&netdev_list);
-
-static void init_netdev(void);
-static int restore_flags(struct netdev *netdev);
-
-/* Check whether device NAME has an IPv4 address assigned to it and, if so, log
- * an error. */
-static void
-check_ipv4_address(const char *name)
-{
- int sock;
- struct ifreq ifr;
-
- sock = socket(AF_INET, SOCK_DGRAM, 0);
- if (sock < 0) {
- VLOG_WARN("socket(AF_INET): %s", strerror(errno));
- return;
- }
-
- strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
- ifr.ifr_addr.sa_family = AF_INET;
- if (ioctl(sock, SIOCGIFADDR, &ifr) == 0) {
- VLOG_ERR("%s device has assigned IP address %s", name,
- inet_ntoa(((struct sockaddr_in*) &ifr.ifr_addr)->sin_addr));
- }
-
- close(sock);
-}
-
-/* Check whether device NAME has an IPv6 address assigned to it and, if so, log
- * an error. */
-static void
-check_ipv6_address(const char *name)
-{
- FILE *file;
- char line[128];
-
- file = fopen("/proc/net/if_inet6", "r");
- if (file == NULL) {
- return;
- }
-
- while (fgets(line, sizeof line, file)) {
- struct in6_addr in6;
- 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))
- {
- char in6_name[INET6_ADDRSTRLEN + 1];
- inet_ntop(AF_INET6, &in6, in6_name, sizeof in6_name);
- VLOG_ERR("%s device has assigned IPv6 address %s",
- name, in6_name);
- }
- }
-
- fclose(file);
-}
-
-static void
-do_ethtool(struct netdev *netdev)
-{
- struct ifreq ifr;
- struct ethtool_cmd ecmd;
-
- netdev->speed = 0;
- netdev->features = 0;
-
- memset(&ifr, 0, sizeof ifr);
- strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
- ifr.ifr_data = (caddr_t) &ecmd;
-
- memset(&ecmd, 0, sizeof ecmd);
- ecmd.cmd = ETHTOOL_GSET;
- if (ioctl(netdev->fd, SIOCETHTOOL, &ifr) == 0) {
- if (ecmd.supported & SUPPORTED_10baseT_Half) {
- netdev->features |= OFPPF_10MB_HD;
- }
- if (ecmd.supported & SUPPORTED_10baseT_Full) {
- netdev->features |= OFPPF_10MB_FD;
- }
- if (ecmd.supported & SUPPORTED_100baseT_Half) {
- netdev->features |= OFPPF_100MB_HD;
- }
- if (ecmd.supported & SUPPORTED_100baseT_Full) {
- netdev->features |= OFPPF_100MB_FD;
- }
- if (ecmd.supported & SUPPORTED_1000baseT_Half) {
- netdev->features |= OFPPF_1GB_HD;
- }
- if (ecmd.supported & SUPPORTED_1000baseT_Full) {
- netdev->features |= OFPPF_1GB_FD;
- }
- /* 10Gbps half-duplex doesn't exist... */
- if (ecmd.supported & SUPPORTED_10000baseT_Full) {
- netdev->features |= OFPPF_10GB_FD;
- }
-
- switch (ecmd.speed) {
- case SPEED_10:
- netdev->speed = 10;
- break;
-
- case SPEED_100:
- netdev->speed = 100;
- break;
-
- case SPEED_1000:
- netdev->speed = 1000;
- break;
-
- case SPEED_2500:
- netdev->speed = 2500;
- break;
-
- case SPEED_10000:
- netdev->speed = 10000;
- break;
- }
- } else {
- VLOG_DBG("ioctl(SIOCETHTOOL) failed: %s", strerror(errno));
- }
-}
-
-/* Opens the network device named 'name' (e.g. "eth0") and returns zero if
- * successful, otherwise a positive errno value. On success, sets '*netdev'
- * to the new network device, otherwise to null. */
-int
-netdev_open(const char *name, struct netdev **netdev_)
-{
- int fd;
- struct sockaddr sa;
- struct ifreq ifr;
- unsigned int ifindex;
- socklen_t rcvbuf_len;
- size_t rcvbuf;
- uint8_t etheraddr[ETH_ADDR_LEN];
- int mtu;
- int error;
- struct netdev *netdev;
-
- *netdev_ = NULL;
- init_netdev();
-
- /* Create raw socket.
- *
- * We have to use SOCK_PACKET, despite its deprecation, because only
- * SOCK_PACKET lets us set the hardware source address of outgoing
- * packets. */
- fd = socket(PF_PACKET, SOCK_PACKET, htons(ETH_P_ALL));
- if (fd < 0) {
- return errno;
- }
-
- /* Bind to specific ethernet device. */
- memset(&sa, 0, sizeof sa);
- sa.sa_family = AF_UNSPEC;
- strncpy((char *) sa.sa_data, name, sizeof sa.sa_data);
- if (bind(fd, &sa, sizeof sa) < 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 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. There is no way to know how long the receive queue is,
- * but we know that the total number of bytes queued does not exceed the
- * receive buffer size, so we pull packets until none are left or we've
- * read that many bytes. */
- rcvbuf_len = sizeof rcvbuf;
- if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, &rcvbuf_len) < 0) {
- VLOG_ERR("getsockopt(SO_RCVBUF) on %s device failed: %s",
- name, strerror(errno));
- goto error;
- }
- while (rcvbuf > 0) {
- char buffer;
- ssize_t n_bytes = recv(fd, &buffer, 1, MSG_TRUNC | MSG_DONTWAIT);
- if (n_bytes <= 0) {
- break;
- }
- rcvbuf -= n_bytes;
- }
-
- /* Get ethernet device index. */
- strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
- if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0) {
- VLOG_ERR("ioctl(SIOCGIFINDEX) on %s device failed: %s",
- name, strerror(errno));
- goto error;
- }
- ifindex = ifr.ifr_ifindex;
-
- /* Get MAC address. */
- if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
- VLOG_ERR("ioctl(SIOCGIFHWADDR) on %s device failed: %s",
- name, strerror(errno));
- goto error;
- }
- if (ifr.ifr_hwaddr.sa_family != AF_UNSPEC
- && ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
- VLOG_WARN("%s device has unknown hardware address family %d",
- name, (int) ifr.ifr_hwaddr.sa_family);
- }
- memcpy(etheraddr, ifr.ifr_hwaddr.sa_data, sizeof etheraddr);
-
- /* Get MTU. */
- if (ioctl(fd, SIOCGIFMTU, &ifr) < 0) {
- VLOG_ERR("ioctl(SIOCGIFMTU) on %s device failed: %s",
- name, strerror(errno));
- goto error;
- }
- mtu = ifr.ifr_mtu;
-
- /* Allocate network device. */
- netdev = xmalloc(sizeof *netdev);
- netdev->name = xstrdup(name);
- netdev->fd = fd;
- memcpy(netdev->etheraddr, etheraddr, sizeof etheraddr);
- netdev->mtu = mtu;
-
- /* Get speed, features. */
- do_ethtool(netdev);
-
- /* Save flags to restore at close or exit. */
- if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
- VLOG_ERR("ioctl(SIOCGIFFLAGS) on %s device failed: %s",
- name, strerror(errno));
- goto error;
- }
- netdev->save_flags = ifr.ifr_flags;
- fatal_signal_block();
- list_push_back(&netdev_list, &netdev->node);
- fatal_signal_unblock();
-
- /* Bring up interface and set promiscuous mode. */
- ifr.ifr_flags |= IFF_PROMISC | IFF_UP;
- if (ioctl(fd, SIOCSIFFLAGS, &ifr) < 0) {
- error = errno;
- VLOG_ERR("failed to set promiscuous mode on %s device: %s",
- name, strerror(errno));
- netdev_close(netdev);
- return error;
- }
-
- /* Complain to administrator if any IP addresses are assigned to the
- * interface. We warn about this because packets received for that IP
- * address will be processed both by the kernel TCP/IP stack and by us as a
- * switch, which produces poor results. */
- check_ipv4_address(name);
- check_ipv6_address(name);
-
- /* Success! */
- *netdev_ = netdev;
- return 0;
-
-error:
- error = errno;
- close(fd);
- return error;
-}
-
-/* Closes and destroys 'netdev'. */
-void
-netdev_close(struct netdev *netdev)
-{
- if (netdev) {
- /* Bring down interface and drop promiscuous mode, if we brought up
- * the interface or enabled promiscuous mode. */
- int error;
- fatal_signal_block();
- error = restore_flags(netdev);
- list_remove(&netdev->node);
- fatal_signal_unblock();
- if (error) {
- VLOG_WARN("failed to restore network device flags on %s: %s",
- netdev->name, strerror(error));
- }
-
- /* Free. */
- free(netdev->name);
- close(netdev->fd);
- free(netdev);
- }
-}
-
-/* Pads 'buffer' out with zero-bytes to the minimum valid length of an
- * Ethernet packet, if necessary. */
-static void
-pad_to_minimum_length(struct buffer *buffer)
-{
- if (buffer->size < ETH_TOTAL_MIN) {
- size_t shortage = ETH_TOTAL_MIN - buffer->size;
- memset(buffer_put_uninit(buffer, shortage), 0, shortage);
- }
-}
-
-/* Attempts to receive a packet from 'netdev' into 'buffer', which the caller
- * must have initialized with sufficient room for the packet. The space
- * required to receive any packet is ETH_HEADER_LEN bytes, plus VLAN_HEADER_LEN
- * bytes, plus the device's MTU (which may be retrieved via netdev_get_mtu()).
- * (Some devices do not allow for a VLAN header, in which case VLAN_HEADER_LEN
- * need not be included.)
- *
- * If a packet is successfully retrieved, returns 0. In this case 'buffer' is
- * guaranteed to contain at least ETH_TOTAL_MIN bytes. Otherwise, returns a
- * positive errno value. Returns EAGAIN immediately if no packet is ready to
- * be returned.
- */
-int
-netdev_recv(struct netdev *netdev, struct buffer *buffer)
-{
- ssize_t n_bytes;
-
- assert(buffer->size == 0);
- assert(buffer_tailroom(buffer) >= ETH_TOTAL_MIN);
- do {
- n_bytes = recv(netdev->fd,
- buffer_tail(buffer), buffer_tailroom(buffer),
- MSG_DONTWAIT);
- } while (n_bytes < 0 && errno == EINTR);
- if (n_bytes < 0) {
- if (errno != EAGAIN) {
- VLOG_WARN("error receiving Ethernet packet on %s: %s",
- strerror(errno), netdev->name);
- }
- return errno;
- } else {
- 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);
- return 0;
- }
-}
-
-/* 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'. */
-void
-netdev_recv_wait(struct netdev *netdev)
-{
- poll_fd_wait(netdev->fd, POLLIN);
-}
-
-/* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive
- * errno value. Returns EAGAIN without blocking if the packet cannot be queued
- * immediately. Returns EMSGSIZE if a partial packet was transmitted or if
- * the packet is too big to transmit on the device.
- *
- * The kernel maintains a packet transmission queue, so the caller is not
- * expected to do additional queuing of packets. */
-int
-netdev_send(struct netdev *netdev, struct buffer *buffer)
-{
- ssize_t n_bytes;
- const struct eth_header *eh;
- struct sockaddr_pkt spkt;
-
- /* Ensure packet is long enough. (Although all incoming packets are at
- * least ETH_TOTAL_MIN bytes long, we could have trimmed some data off a
- * minimum-size packet, e.g. by dropping a vlan header.)
- *
- * The kernel does not require this, but it ensures that we always access
- * valid memory in grabbing the sockaddr below. */
- pad_to_minimum_length(buffer);
-
- /* Construct packet sockaddr, which SOCK_PACKET requires. */
- spkt.spkt_family = AF_PACKET;
- strncpy((char *) spkt.spkt_device, netdev->name, sizeof spkt.spkt_device);
- eh = buffer_at_assert(buffer, 0, sizeof *eh);
- spkt.spkt_protocol = eh->eth_type;
-
- do {
- n_bytes = sendto(netdev->fd, buffer->data, buffer->size, 0,
- (const struct sockaddr *) &spkt, sizeof spkt);
- } 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("error sending Ethernet packet on %s: %s",
- netdev->name, strerror(errno));
- }
- return errno;
- } else if (n_bytes != buffer->size) {
- VLOG_WARN("send partial Ethernet packet (%d bytes of %zu) on %s",
- (int) n_bytes, buffer->size, netdev->name);
- return EMSGSIZE;
- } else {
- return 0;
- }
-}
-
-/* Registers with the poll loop to wake up from the next call to poll_block()
- * when the packet transmission queue has sufficient room to transmit a packet
- * with netdev_send().
- *
- * The kernel maintains a packet transmission queue, so the client is not
- * expected to do additional queuing of packets. Thus, this function is
- * unlikely to ever be used. It is included for completeness. */
-void
-netdev_send_wait(struct netdev *netdev)
-{
- poll_fd_wait(netdev->fd, POLLOUT);
-}
-
-/* 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;
-}
-
-/* Returns the name of the network device that 'netdev' represents,
- * e.g. "eth0". The caller must not modify or free the returned string. */
-const char *
-netdev_get_name(const struct netdev *netdev)
-{
- 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. */
-int
-netdev_get_mtu(const struct netdev *netdev)
-{
- return netdev->mtu;
-}
-
-/* Returns the current speed of the network device that 'netdev' represents, in
- * megabits per second, or 0 if the speed is unknown. */
-int
-netdev_get_speed(const struct netdev *netdev)
-{
- return netdev->speed;
-}
-
-/* Returns the features supported by 'netdev', as a bitmap of bits from enum
- * ofp_phy_port, in host byte order. */
-uint32_t
-netdev_get_features(const struct netdev *netdev)
-{
- return netdev->features;
-}
-\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)
-{
- static bool inited;
- if (!inited) {
- inited = true;
- fatal_signal_add_hook(restore_all_flags, NULL);
- }
-}
-
-/* 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.
- *
- * To avoid reentry, the caller must ensure that fatal signals are blocked. */
-static int
-restore_flags(struct netdev *netdev)
-{
- struct ifreq ifr;
-
- /* Get current flags. */
- strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
- if (ioctl(netdev->fd, SIOCGIFFLAGS, &ifr) < 0) {
- return errno;
- }
-
- /* Restore flags that we might have changed, if necessary. */
- if ((ifr.ifr_flags ^ netdev->save_flags) & (IFF_PROMISC | IFF_UP)) {
- ifr.ifr_flags &= ~(IFF_PROMISC | IFF_UP);
- ifr.ifr_flags |= netdev->save_flags & (IFF_PROMISC | IFF_UP);
- if (ioctl(netdev->fd, SIOCSIFFLAGS, &ifr) < 0) {
- return errno;
- }
- }
-
- return 0;
-}
-
-/* Retores all the flags on all network devices that we modified. Called from
- * a signal handler, so it does not attempt to report error conditions. */
-static void
-restore_all_flags(void *aux UNUSED)
-{
- struct netdev *netdev;
- LIST_FOR_EACH (netdev, struct netdev, node, &netdev_list) {
- restore_flags(netdev);
- }
-}
+++ /dev/null
-/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
- * Junior University
- *
- * We are making the OpenFlow specification and associated documentation
- * (Software) available for public use and benefit with the expectation
- * that others will use, modify and enhance the Software and contribute
- * those enhancements back to the community. However, since we would
- * like to make the Software available for broadest use, with as few
- * restrictions as possible permission is hereby granted, free of
- * charge, to any person obtaining a copy of this Software to deal in
- * the Software under the copyrights without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sublicense, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice shall be
- * included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- *
- * The name and trademarks of copyright holder(s) may NOT be used in
- * advertising or publicity pertaining to the Software or any
- * derivatives without specific, written prior permission.
- */
-
-/* Generic interface to network devices.
- *
- * Currently, there is a single implementation of this interface that supports
- * Linux. The interface should be generic enough to be implementable on other
- * operating systems as well. */
-
-#ifndef NETDEV_H
-#define NETDEV_H 1
-
-#include <stdbool.h>
-#include <stdint.h>
-
-struct buffer;
-
-struct netdev;
-int netdev_open(const char *name, struct netdev **);
-void netdev_close(struct netdev *);
-int netdev_recv(struct netdev *, struct buffer *);
-void netdev_recv_wait(struct netdev *);
-int netdev_send(struct netdev *, struct buffer *);
-const uint8_t *netdev_get_etheraddr(const struct netdev *);
-const char *netdev_get_name(const struct netdev *);
-int netdev_get_mtu(const struct netdev *);
-int netdev_get_speed(const struct netdev *);
-uint32_t netdev_get_features(const struct netdev *);
-
-#endif /* netdev.h */
projects / openvswitch / commitdiff