#include <arpa/inet.h>
#include <inttypes.h>
#include <linux/if_tun.h>
+#include <linux/ip.h>
#include <linux/types.h>
#include <linux/ethtool.h>
#include <linux/rtnetlink.h>
#include <netpacket/packet.h>
#include <net/ethernet.h>
#include <net/if.h>
+#include <linux/if_tunnel.h>
#include <net/if_arp.h>
#include <net/if_packet.h>
#include <net/route.h>
#include "netlink.h"
#include "ofpbuf.h"
#include "openflow/openflow.h"
+#include "openvswitch/gre.h"
#include "packets.h"
#include "poll-loop.h"
#include "rtnetlink.h"
#include "shash.h"
#include "svec.h"
+#ifndef GRE_IOCTL_ONLY
+#include <linux/if_link.h>
+#endif
+
#define THIS_MODULE VLM_netdev_linux
#include "vlog.h"
\f
#define ADVERTISED_Asym_Pause (1 << 14)
#endif
+struct tap_state {
+ int tap_fd; /* File descriptor for TAP device. */
+};
+
/* Provider-specific netdev object. Netdev objects are devices that are
* created by the netdev library through a netdev_create() call. */
struct netdev_obj_linux {
struct netdev_obj netdev_obj;
-
- int tap_fd; /* File descriptor for TAP device. */
+ union {
+ struct tap_state tap;
+ } state;
};
struct netdev_linux {
/* An AF_INET socket (used for ioctl operations). */
static int af_inet_sock = -1;
+struct gre_config {
+ uint32_t local_ip;
+ uint32_t remote_ip;
+ uint32_t in_key;
+ uint32_t out_key;
+ bool have_in_key;
+ bool have_out_key;
+ bool in_csum;
+ bool out_csum;
+};
+
+static struct {
+ union {
+ struct nl_sock *nl_sock;
+ int ioctl_fd;
+ };
+ bool use_ioctl;
+} gre_descriptors;
+
struct netdev_linux_notifier {
struct netdev_notifier notifier;
struct list node;
static struct netdev_obj_linux *
netdev_obj_linux_cast(const struct netdev_obj *netdev_obj)
{
+ /* xxx Gross hack! Until we get the class 'type' issue resolved. */
+#if 0
netdev_obj_assert_class(netdev_obj, &netdev_linux_class);
+#endif
return CONTAINER_OF(netdev_obj, struct netdev_obj_linux, netdev_obj);
}
}
}
+/* The arguments are marked as unused to prevent warnings on platforms where
+ * the Netlink interface isn't supported. */
+static int
+setup_gre_netlink(const char *name UNUSED, struct gre_config *config UNUSED,
+ bool create UNUSED)
+{
+#ifdef GRE_IOCTL_ONLY
+ return EOPNOTSUPP;
+#else
+ int error;
+ struct ofpbuf request, *reply;
+ unsigned int nl_flags;
+ struct ifinfomsg ifinfomsg;
+ struct nlattr *linkinfo_hdr;
+ struct nlattr *info_data_hdr;
+ uint16_t iflags = 0;
+ uint16_t oflags = 0;
+ uint8_t pmtudisc = 0;
+
+ if (!gre_descriptors.nl_sock) {
+ error = nl_sock_create(NETLINK_ROUTE, 0, 0, 0,
+ &gre_descriptors.nl_sock);
+ if (error) {
+ VLOG_WARN("couldn't create netlink socket: %s\n", strerror(error));
+ gre_descriptors.nl_sock = NULL;
+ goto error;
+ }
+ }
+
+ ofpbuf_init(&request, 0);
+
+ nl_flags = NLM_F_REQUEST;
+ if (create) {
+ nl_flags |= NLM_F_CREATE|NLM_F_EXCL;
+ }
+
+ /* We over-reserve space, because we do some pointer arithmetic
+ * and don't want the buffer address shifting under us. */
+ nl_msg_put_nlmsghdr(&request, gre_descriptors.nl_sock, 2048, RTM_NEWLINK,
+ nl_flags);
+
+ memset(&ifinfomsg, 0, sizeof ifinfomsg);
+ ifinfomsg.ifi_family = AF_UNSPEC;
+ nl_msg_put(&request, &ifinfomsg, sizeof ifinfomsg);
+
+ linkinfo_hdr = ofpbuf_tail(&request);
+ nl_msg_put_unspec(&request, IFLA_LINKINFO, NULL, 0);
+
+ nl_msg_put_unspec(&request, IFLA_INFO_KIND, "gretap", 6);
+
+ info_data_hdr = ofpbuf_tail(&request);
+ nl_msg_put_unspec(&request, IFLA_INFO_DATA, NULL, 0);
+
+ /* Set flags */
+ if (config->have_in_key) {
+ iflags |= GRE_KEY;
+ }
+ if (config->have_out_key) {
+ oflags |= GRE_KEY;
+ }
+
+ if (config->in_csum) {
+ iflags |= GRE_CSUM;
+ }
+ if (config->out_csum) {
+ oflags |= GRE_CSUM;
+ }
+
+ /* Add options */
+ nl_msg_put_u32(&request, IFLA_GRE_IKEY, config->in_key);
+ nl_msg_put_u32(&request, IFLA_GRE_OKEY, config->out_key);
+ nl_msg_put_u16(&request, IFLA_GRE_IFLAGS, iflags);
+ nl_msg_put_u16(&request, IFLA_GRE_OFLAGS, oflags);
+ nl_msg_put_u32(&request, IFLA_GRE_LOCAL, config->local_ip);
+ nl_msg_put_u32(&request, IFLA_GRE_REMOTE, config->remote_ip);
+ nl_msg_put_u8(&request, IFLA_GRE_PMTUDISC, pmtudisc);
+ nl_msg_put_u8(&request, IFLA_GRE_TTL, 0);
+ nl_msg_put_u8(&request, IFLA_GRE_TOS, 0);
+
+ info_data_hdr->nla_len = (char *)ofpbuf_tail(&request)
+ - (char *)info_data_hdr;
+ linkinfo_hdr->nla_len = (char *)ofpbuf_tail(&request)
+ - (char *)linkinfo_hdr;
+
+ nl_msg_put_string(&request, IFLA_IFNAME, name);
+
+ error = nl_sock_transact(gre_descriptors.nl_sock, &request, &reply);
+ ofpbuf_uninit(&request);
+ if (error) {
+ VLOG_WARN("couldn't transact netlink socket: %s\n", strerror(error));
+ goto error;
+ }
+ ofpbuf_delete(reply);
+
+error:
+ return error;
+#endif
+}
+
+static int
+setup_gre_ioctl(const char *name, struct gre_config *config, bool create)
+{
+ struct ip_tunnel_parm p;
+ struct ifreq ifr;
+
+ memset(&p, 0, sizeof p);
+
+ strncpy(p.name, name, IFNAMSIZ);
+
+ p.iph.version = 4;
+ p.iph.ihl = 5;
+ p.iph.protocol = IPPROTO_GRE;
+ p.iph.saddr = config->local_ip;
+ p.iph.daddr = config->remote_ip;
+
+ if (config->have_in_key) {
+ p.i_flags |= GRE_KEY;
+ p.i_key = config->in_key;
+ }
+ if (config->have_out_key) {
+ p.o_flags |= GRE_KEY;
+ p.o_key = config->out_key;
+ }
+
+ if (config->in_csum) {
+ p.i_flags |= GRE_CSUM;
+ }
+ if (config->out_csum) {
+ p.o_flags |= GRE_CSUM;
+ }
+
+ strncpy(ifr.ifr_name, create ? GRE_IOCTL_DEVICE : name, IFNAMSIZ);
+ ifr.ifr_ifru.ifru_data = (void *)&p;
+
+ if (!gre_descriptors.ioctl_fd) {
+ gre_descriptors.ioctl_fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (gre_descriptors.ioctl_fd < 0) {
+ VLOG_WARN("couldn't create gre ioctl socket: %s\n", strerror(errno));
+ gre_descriptors.ioctl_fd = 0;
+ return errno;
+ }
+ }
+
+ if (ioctl(gre_descriptors.ioctl_fd, create ? SIOCADDGRETAP : SIOCCHGGRETAP,
+ &ifr) < 0) {
+ VLOG_WARN("couldn't do gre ioctl: %s\n", strerror(errno));
+ return errno;
+ }
+
+ return 0;
+}
+
+static int
+setup_gre(const char *name, const struct shash *args, bool create)
+{
+ int error;
+ struct in_addr in_addr;
+ struct shash_node *node;
+ struct gre_config config;
+
+ memset(&config, 0, sizeof config);
+ config.in_csum = true;
+ config.out_csum = true;
+
+ SHASH_FOR_EACH (node, args) {
+ if (!strcmp(node->name, "remote_ip")) {
+ if (lookup_ip(node->data, &in_addr)) {
+ VLOG_WARN("bad 'remote_ip' for gre device %s ", name);
+ } else {
+ config.remote_ip = in_addr.s_addr;
+ }
+ } else if (!strcmp(node->name, "local_ip")) {
+ if (lookup_ip(node->data, &in_addr)) {
+ VLOG_WARN("bad 'local_ip' for gre device %s ", name);
+ } else {
+ config.local_ip = in_addr.s_addr;
+ }
+ } else if (!strcmp(node->name, "key")) {
+ config.have_in_key = true;
+ config.have_out_key = true;
+ config.in_key = htonl(atoi(node->data));
+ config.out_key = htonl(atoi(node->data));
+ } else if (!strcmp(node->name, "in_key")) {
+ config.have_in_key = true;
+ config.in_key = htonl(atoi(node->data));
+ } else if (!strcmp(node->name, "out_key")) {
+ config.have_out_key = true;
+ config.out_key = htonl(atoi(node->data));
+ } else if (!strcmp(node->name, "csum")) {
+ if (!strcmp(node->data, "false")) {
+ config.in_csum = false;
+ config.out_csum = false;
+ }
+ } else {
+ VLOG_WARN("unknown gre argument '%s'", node->name);
+ }
+ }
+
+ if (!config.remote_ip) {
+ VLOG_WARN("gre type requires valid 'remote_ip' argument");
+ error = EINVAL;
+ goto error;
+ }
+
+ if (!gre_descriptors.use_ioctl) {
+ error = setup_gre_netlink(name, &config, create);
+ if (error == EOPNOTSUPP) {
+ gre_descriptors.use_ioctl = true;
+ }
+ }
+ if (gre_descriptors.use_ioctl) {
+ error = setup_gre_ioctl(name, &config, create);
+ }
+
+error:
+ return error;
+}
+
+static int
+if_up(const char *name)
+{
+ struct ifreq ifr;
+
+ strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
+ ifr.ifr_flags = IFF_UP;
+
+ if (ioctl(af_inet_sock, SIOCSIFFLAGS, &ifr) == -1) {
+ VLOG_DBG_RL(&rl, "%s: failed to bring device up: %s",
+ name, strerror(errno));
+ return errno;
+ }
+
+ return 0;
+}
+
/* Creates the netdev object of 'type' with 'name'. */
static int
-netdev_linux_create(const char *name, const char *type,
+netdev_linux_create_system(const char *name, const char *type UNUSED,
const struct shash *args, bool created)
{
struct netdev_obj_linux *netdev_obj;
- static const char tap_dev[] = "/dev/net/tun";
- struct ifreq ifr;
- int error;
if (!shash_is_empty(args)) {
- VLOG_WARN("arguments for %s devices should be empty", type);
+ VLOG_WARN("arguments for system devices should be empty");
}
- /* Create the name binding in the netdev library for this object. */
netdev_obj = xcalloc(1, sizeof *netdev_obj);
netdev_obj_init(&netdev_obj->netdev_obj, name, &netdev_linux_class,
created);
- netdev_obj->tap_fd = -1;
- if (strcmp(type, "tap")) {
- return 0;
+ return 0;
+}
+
+static int
+netdev_linux_create_tap(const char *name, const char *type UNUSED,
+ const struct shash *args, bool created)
+{
+ struct netdev_obj_linux *netdev_obj;
+ struct tap_state *state;
+ static const char tap_dev[] = "/dev/net/tun";
+ struct ifreq ifr;
+ int error;
+
+ if (!shash_is_empty(args)) {
+ VLOG_WARN("arguments for TAP devices should be empty");
}
+ netdev_obj = xcalloc(1, sizeof *netdev_obj);
+ netdev_obj_init(&netdev_obj->netdev_obj, name, &netdev_tap_class, created);
+
+ state = &netdev_obj->state.tap;
+
/* Open tap device. */
- netdev_obj->tap_fd = open(tap_dev, O_RDWR);
- if (netdev_obj->tap_fd < 0) {
+ state->tap_fd = open(tap_dev, O_RDWR);
+ if (state->tap_fd < 0) {
error = errno;
VLOG_WARN("opening \"%s\" failed: %s", tap_dev, strerror(error));
goto error;
/* Create tap device. */
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
- if (ioctl(netdev_obj->tap_fd, TUNSETIFF, &ifr) == -1) {
+ if (ioctl(state->tap_fd, TUNSETIFF, &ifr) == -1) {
VLOG_WARN("%s: creating tap device failed: %s", name,
strerror(errno));
error = errno;
}
/* Make non-blocking. */
- error = set_nonblocking(netdev_obj->tap_fd);
+ error = set_nonblocking(state->tap_fd);
+ if (error) {
+ goto error;
+ }
+
+ error = if_up(name);
+ if (error) {
+ goto error;
+ }
+
+ return 0;
+
+error:
+ netdev_destroy(name);
+ return error;
+}
+
+static int
+netdev_linux_create_gre(const char *name, const char *type UNUSED,
+ const struct shash *args, bool created)
+{
+ struct netdev_obj_linux *netdev_obj;
+ int error;
+
+ netdev_obj = xcalloc(1, sizeof *netdev_obj);
+ netdev_obj_init(&netdev_obj->netdev_obj, name, &netdev_gre_class, created);
+
+ error = setup_gre(name, args, true);
+ if (error) {
+ goto error;
+ }
+
+ error = if_up(name);
if (error) {
goto error;
}
return error;
}
+static int
+netdev_linux_reconfigure_gre(struct netdev_obj *netdev_obj_,
+ const struct shash *args)
+{
+ struct netdev_obj_linux *netdev_obj = netdev_obj_linux_cast(netdev_obj_);
+ const char *name = netdev_obj_get_name(&netdev_obj->netdev_obj);
+
+ return setup_gre(name, args, false);
+}
+
+/* The arguments are marked as unused to prevent warnings on platforms where
+ * the Netlink interface isn't supported. */
+static int
+destroy_gre_netlink(struct netdev_obj_linux *netdev_obj UNUSED)
+{
+#ifdef GRE_IOCTL_ONLY
+ return EOPNOTSUPP;
+#else
+ const char *name = netdev_obj_get_name(&netdev_obj->netdev_obj);
+ int error;
+ struct ofpbuf request, *reply;
+ struct ifinfomsg ifinfomsg;
+ int ifindex;
+
+ ofpbuf_init(&request, 0);
+
+ nl_msg_put_nlmsghdr(&request, gre_descriptors.nl_sock, 0, RTM_DELLINK,
+ NLM_F_REQUEST);
+
+ memset(&ifinfomsg, 0, sizeof ifinfomsg);
+ ifinfomsg.ifi_family = AF_UNSPEC;
+ nl_msg_put(&request, &ifinfomsg, sizeof ifinfomsg);
+
+ ifindex = do_get_ifindex(name);
+ nl_msg_put_u32(&request, IFLA_LINK, ifindex);
+
+ nl_msg_put_string(&request, IFLA_IFNAME, name);
+
+ error = nl_sock_transact(gre_descriptors.nl_sock, &request, &reply);
+ ofpbuf_uninit(&request);
+ if (error) {
+ VLOG_WARN("couldn't transact netlink socket: %s\n", strerror(error));
+ goto error;
+ }
+ ofpbuf_delete(reply);
+
+error:
+ return 0;
+#endif
+}
+
+static int
+destroy_gre_ioctl(struct netdev_obj_linux *netdev_obj)
+{
+ const char *name = netdev_obj_get_name(&netdev_obj->netdev_obj);
+ struct ip_tunnel_parm p;
+ struct ifreq ifr;
+
+ memset(&p, 0, sizeof p);
+ strncpy(p.name, name, IFNAMSIZ);
+
+ strncpy(ifr.ifr_name, name, IFNAMSIZ);
+ ifr.ifr_ifru.ifru_data = (void *)&p;
+
+ if (ioctl(gre_descriptors.ioctl_fd, SIOCDELGRETAP, &ifr) < 0) {
+ VLOG_WARN("couldn't do gre ioctl: %s\n", strerror(errno));
+ return errno;
+ }
+
+ return 0;
+}
+
+static void
+destroy_tap(struct netdev_obj_linux *netdev_obj)
+{
+ struct tap_state *state = &netdev_obj->state.tap;
+ if (state->tap_fd >= 0) {
+ close(state->tap_fd);
+ }
+}
+
/* Destroys the netdev object 'netdev_obj_'. */
static void
netdev_linux_destroy(struct netdev_obj *netdev_obj_)
{
struct netdev_obj_linux *netdev_obj = netdev_obj_linux_cast(netdev_obj_);
+ const char *type = netdev_obj_get_type(netdev_obj_);
- if (netdev_obj->tap_fd >= 0) {
- close(netdev_obj->tap_fd);
+ if (!strcmp(type, "tap")) {
+ destroy_tap(netdev_obj);
+ } else if (!strcmp(type, "gre")) {
+ if (gre_descriptors.use_ioctl) {
+ destroy_gre_ioctl(netdev_obj);
+ } else {
+ destroy_gre_netlink(netdev_obj);
+ }
}
free(netdev_obj);
-
- return;
}
static int
netdev_linux_run,
netdev_linux_wait,
- netdev_linux_create,
+ netdev_linux_create_system,
netdev_linux_destroy,
NULL, /* reconfigure */
NULL, /* run */
NULL, /* wait */
- netdev_linux_create,
+ netdev_linux_create_tap,
netdev_linux_destroy,
NULL, /* reconfigure */
netdev_linux_poll_add,
netdev_linux_poll_remove,
};
+
+const struct netdev_class netdev_gre_class = {
+ "gre", /* type */
+
+ netdev_linux_init,
+ NULL, /* run */
+ NULL, /* wait */
+
+ netdev_linux_create_gre,
+ netdev_linux_destroy,
+ netdev_linux_reconfigure_gre,
+
+ netdev_linux_open,
+ netdev_linux_close,
+
+ netdev_linux_enumerate,
+
+ netdev_linux_recv,
+ netdev_linux_recv_wait,
+ netdev_linux_drain,
+
+ netdev_linux_send,
+ netdev_linux_send_wait,
+
+ netdev_linux_set_etheraddr,
+ netdev_linux_get_etheraddr,
+ netdev_linux_get_mtu,
+ netdev_linux_get_ifindex,
+ netdev_linux_get_carrier,
+ netdev_linux_get_stats,
+
+ netdev_linux_get_features,
+ netdev_linux_set_advertisements,
+ netdev_linux_get_vlan_vid,
+ netdev_linux_set_policing,
+
+ netdev_linux_get_in4,
+ netdev_linux_set_in4,
+ netdev_linux_get_in6,
+ netdev_linux_add_router,
+ netdev_linux_get_next_hop,
+ netdev_linux_arp_lookup,
+
+ netdev_linux_update_flags,
+
+ netdev_linux_poll_add,
+ netdev_linux_poll_remove,
+};
\f
static int
get_stats_via_netlink(int ifindex, struct netdev_stats *stats)
projects / openvswitch / commitdiff