diff options
Diffstat (limited to 'lib/netdev.c')
| -rw-r--r-- | lib/netdev.c | 1556 |
1 files changed, 1556 insertions, 0 deletions
diff --git a/lib/netdev.c b/lib/netdev.c new file mode 100644 index 00000000..7fd070eb --- /dev/null +++ b/lib/netdev.c @@ -0,0 +1,1556 @@ +/* + * Copyright (c) 2008, 2009 Nicira Networks. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <config.h> +#include "netdev.h" + +#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 <unistd.h> + +#include "coverage.h" +#include "dynamic-string.h" +#include "fatal-signal.h" +#include "list.h" +#include "netlink.h" +#include "ofpbuf.h" +#include "openflow/openflow.h" +#include "packets.h" +#include "poll-loop.h" +#include "socket-util.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) }, +}; + +/* 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 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) +{ + 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; + } + + 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; + } + } + *in6 = in6addr_any; + + fclose(file); +} + +static int +do_ethtool(struct netdev *netdev, struct ethtool_cmd *ecmd, + int cmd, const char *cmd_name) +{ + 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. */ + } + return errno; + } +} + +static int +do_get_features(struct netdev *netdev, + uint32_t *current, uint32_t *advertised, + uint32_t *supported, uint32_t *peer) +{ + 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; + } + return 0; +} + +/* Opens the network device named 'name' (e.g. "eth0") and returns zero if + * successful, otherwise a positive errno value. On success, sets '*netdevp' + * to the new network device, otherwise to null. + * + * 'ethertype' may be a 16-bit Ethernet protocol value in host byte order to + * capture frames of that type received on the device. It may also be one of + * 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_) +{ + 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; + int error; + struct netdev *netdev; + + 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; + } + + 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; + } + } + + /* 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); + } + 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->netdev_fd); + if (netdev->netdev_fd != netdev->tap_fd) { + close(netdev->tap_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 ofpbuf *buffer) +{ + if (buffer->size < ETH_TOTAL_MIN) { + ofpbuf_put_zeros(buffer, ETH_TOTAL_MIN - buffer->size); + } +} + +/* 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 ofpbuf *buffer) +{ + ssize_t n_bytes; + + 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", + strerror(errno), netdev->name); + } + return errno; + } else { + 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); + 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->tap_fd, POLLIN); +} + +/* 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); + } +} + +/* Sends 'buffer' on 'netdev'. Returns 0 if successful, otherwise a positive + * errno value. Returns EAGAIN without blocking if the packet cannot be queued + * immediately. Returns EMSGSIZE if a partial packet was transmitted or if + * the packet is too big or too small to transmit on the device. + * + * The caller retains ownership of 'buffer' in all cases. + * + * The kernel maintains a packet transmission queue, so the caller is not + * expected to do additional queuing of packets. */ +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 { + COVERAGE_INC(netdev_sent); + 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) +{ + if (netdev->tap_fd == netdev->netdev_fd) { + poll_fd_wait(netdev->tap_fd, POLLOUT); + } else { + /* TAP device always accepts packets.*/ + poll_immediate_wake(); + } +} + +/* Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful, + * otherwise a positive errno value. */ +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; +} + +int +netdev_nodev_set_etheraddr(const char *name, const 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; +} + +/* 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; +} + +/* Stores the features supported by 'netdev' into each of '*current', + * '*advertised', '*supported', and '*peer' that are non-null. Each value is a + * bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if + * successful, otherwise a positive errno value. On failure, all of the + * passed-in values are set to 0. */ +int +netdev_get_features(struct netdev *netdev, + uint32_t *current, uint32_t *advertised, + 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]); +} + +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 (if + * 'in4' is non-null) and returns true. Otherwise, returns false. */ +bool +netdev_get_in4(const struct netdev *netdev, struct in_addr *in4) +{ + struct ifreq ifr; + struct in_addr ip = { INADDR_ANY }; + + 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; + } + return ip.s_addr != INADDR_ANY; +} + +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) +{ + struct ifreq ifr; + 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)); + } + return error; +} + +/* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If + * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a + * positive errno value. */ +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; +} + +/* Adds 'router' as a default IP gateway. */ +int +netdev_add_router(struct in_addr router) +{ + struct in_addr any = { INADDR_ANY }; + struct rtentry rt; + int error; + + memset(&rt, 0, sizeof rt); + make_in4_sockaddr(&rt.rt_dst, any); + make_in4_sockaddr(&rt.rt_gateway, router); + make_in4_sockaddr(&rt.rt_genmask, any); + rt.rt_flags = RTF_UP | RTF_GATEWAY; + COVERAGE_INC(netdev_add_router); + error = ioctl(af_inet_sock, SIOCADDRT, &rt) < 0 ? errno : 0; + if (error) { + VLOG_WARN("ioctl(SIOCADDRT): %s", strerror(error)); + } + return error; +} + +/* 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'. */ +int +netdev_get_flags(const struct netdev *netdev, enum netdev_flags *flagsp) +{ + return netdev_nodev_get_flags(netdev->name, flagsp); +} + +static int +nd_to_iff_flags(enum netdev_flags nd) +{ + int iff = 0; + if (nd & NETDEV_UP) { + iff |= IFF_UP; + } + if (nd & NETDEV_PROMISC) { + iff |= IFF_PROMISC; + } + return iff; +} + +/* On 'netdev', turns off the flags in 'off' and then turns on the flags in + * 'on'. If 'permanent' is true, the changes will persist; otherwise, they + * will be reverted when 'netdev' is closed or the program exits. Returns 0 if + * successful, otherwise a positive errno value. */ +static int +do_update_flags(struct netdev *netdev, enum netdev_flags off, + enum netdev_flags on, bool permanent) +{ + int old_flags, new_flags; + int error; + + error = get_flags(netdev->name, &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; + } + if (new_flags != old_flags) { + error = set_flags(netdev->name, new_flags); + } + return error; +} + +/* 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. + * Returns 0 if successful, otherwise a positive errno value. */ +int +netdev_set_flags(struct netdev *netdev, enum netdev_flags flags, + bool permanent) +{ + return do_update_flags(netdev, -1, flags, permanent); +} + +/* Turns on the specified 'flags' on 'netdev'. + * If 'permanent' is true, the changes will persist; otherwise, they + * will be reverted when 'netdev' is closed or the program exits. + * Returns 0 if successful, otherwise a positive errno value. */ +int +netdev_turn_flags_on(struct netdev *netdev, enum netdev_flags flags, + bool permanent) +{ + return do_update_flags(netdev, 0, flags, permanent); +} + +/* Turns off the specified 'flags' on 'netdev'. + * If 'permanent' is true, the changes will persist; otherwise, they + * will be reverted when 'netdev' is closed or the program exits. + * Returns 0 if successful, otherwise a positive errno value. */ +int +netdev_turn_flags_off(struct netdev *netdev, enum netdev_flags flags, + bool permanent) +{ + return do_update_flags(netdev, flags, 0, 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_arp_lookup(const struct netdev *netdev, + uint32_t ip, uint8_t mac[ETH_ADDR_LEN]) +{ + struct arpreq r; + struct sockaddr_in *pa; + int retval; + + 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; +} + +static int +get_stats_via_netlink(int ifindex, struct netdev_stats *stats) +{ + 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); + 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; + } + + 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; +} + +int +netdev_get_carrier(const struct netdev *netdev, 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; + } + *carrier = line[0] != '0'; + error = 0; + +exit_close: + close(fd); +exit: + free(fn); + return error; +} + +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); + } + + 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; +} + +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); +} + +/* Initializes 'svec' with a list of the names of all known network devices. */ +void +netdev_enumerate(struct svec *svec) +{ + 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)); + } +} + +/* 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) +{ + 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; +} + +int +netdev_nodev_get_etheraddr(const char *netdev_name, uint8_t mac[6]) +{ + init_netdev(); + + return get_etheraddr(netdev_name, mac, NULL); +} + +/* 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) +{ + struct ds line = DS_EMPTY_INITIALIZER; + FILE *stream = NULL; + int error; + char *fn; + + COVERAGE_INC(netdev_get_vlan_vid); + fn = xasprintf("/proc/net/vlan/%s", netdev_name); + stream = fopen(fn, "r"); + if (!stream) { + error = errno; + goto done; + } + + if (ds_get_line(&line, stream)) { + if (ferror(stream)) { + error = errno; + VLOG_ERR_RL(&rl, "error reading \"%s\": %s", fn, strerror(errno)); + } else { + error = EPROTO; + VLOG_ERR_RL(&rl, "unexpected end of file reading \"%s\"", fn); + } + goto done; + } + + if (!sscanf(ds_cstr(&line), "%*s VID: %d", vlan_vid)) { + error = EPROTO; + VLOG_ERR_RL(&rl, "parse error reading \"%s\" line 1: \"%s\"", + fn, ds_cstr(&line)); + goto done; + } + + error = 0; + +done: + free(fn); + if (stream) { + fclose(stream); + } + ds_destroy(&line); + if (error) { + *vlan_vid = -1; + } + return error; +} + +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) { + int ifindex; + int error; + + inited = true; + + fatal_signal_add_hook(restore_all_flags, NULL, true); + + af_inet_sock = socket(AF_INET, SOCK_DGRAM, 0); + if (af_inet_sock < 0) { + ovs_fatal(errno, "socket(AF_INET)"); + } + + error = nl_sock_create(NETLINK_ROUTE, 0, 0, 0, &rtnl_sock); + if (error) { + ovs_fatal(error, "socket(AF_NETLINK, NETLINK_ROUTE)"); + } + + /* 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; + } + } + } +} + +/* 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; + 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; + } + } + + 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); + } +} + +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; +} |