#include <errno.h>
#include <fcntl.h>
+#include <sys/socket.h>
+#include <linux/rtnetlink.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include "byte-order.h"
+#include "hash.h"
+#include "hmap.h"
#include "list.h"
#include "netdev-provider.h"
+#include "netlink.h"
+#include "netlink-socket.h"
+#include "ofpbuf.h"
#include "openvswitch/datapath-protocol.h"
#include "openvswitch/tunnel.h"
#include "packets.h"
+#include "rtnetlink.h"
+#include "rtnetlink-route.h"
+#include "rtnetlink-link.h"
#include "shash.h"
#include "socket-util.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(netdev_vport);
+static struct hmap name_map;
+static struct hmap route_map;
+static struct rtnetlink_notifier netdev_vport_link_notifier;
+static struct rtnetlink_notifier netdev_vport_route_notifier;
+
+struct route_node {
+ struct hmap_node node; /* Node in route_map. */
+ int rta_oif; /* Egress interface index. */
+ uint32_t rta_dst; /* Destination address in host byte order. */
+ unsigned char rtm_dst_len; /* Destination address length. */
+};
+
+struct name_node {
+ struct hmap_node node; /* Node in name_map. */
+ uint32_t ifi_index; /* Kernel interface index. */
+
+ char ifname[IFNAMSIZ]; /* Interface name. */
+};
+
struct netdev_vport_notifier {
struct netdev_notifier notifier;
struct list list_node;
const struct shash *, struct netdev_dev **);
static void netdev_vport_poll_notify(const struct netdev *);
+static void netdev_vport_tnl_iface_init(void);
+static void netdev_vport_route_change(const struct rtnetlink_route_change *,
+ void *);
+static void netdev_vport_link_change(const struct rtnetlink_link_change *,
+ void *);
+
static bool
is_vport_class(const struct netdev_class *class)
{
}
}
+static int
+netdev_vport_init(void)
+{
+ netdev_vport_tnl_iface_init();
+ return 0;
+}
+
static int
netdev_vport_create(const struct netdev_class *netdev_class, const char *name,
const struct shash *args,
free(notifier);
}
+
+static void
+netdev_vport_run(void)
+{
+ rtnetlink_link_notifier_run();
+ rtnetlink_route_notifier_run();
+}
+
+static void
+netdev_vport_wait(void)
+{
+ rtnetlink_link_notifier_wait();
+ rtnetlink_route_notifier_wait();
+}
+\f
+/* get_tnl_iface() implementation. */
+
+static struct name_node *
+name_node_lookup(int ifi_index)
+{
+ struct name_node *nn;
+
+ HMAP_FOR_EACH_WITH_HASH(nn, node, hash_int(ifi_index, 0), &name_map) {
+ if (nn->ifi_index == ifi_index) {
+ return nn;
+ }
+ }
+
+ return NULL;
+}
+
+static struct route_node *
+route_node_lookup(int rta_oif, uint32_t rta_dst, unsigned char rtm_dst_len)
+{
+ uint32_t hash;
+ struct route_node *rn;
+
+ hash = hash_3words(rta_oif, rta_dst, rtm_dst_len);
+ HMAP_FOR_EACH_WITH_HASH(rn, node, hash, &route_map) {
+ if (rn->rta_oif == rn->rta_oif &&
+ rn->rta_dst == rn->rta_dst &&
+ rn->rtm_dst_len == rn->rtm_dst_len) {
+ return rn;
+ }
+ }
+
+ return NULL;
+}
+
+/* Resets the name or route map depending on the value of 'is_name'. Clears
+ * the appropriate map, makes an rtnetlink dump request, and calls the change
+ * callback for each reply from the kernel. One should probably use
+ * netdev_vport_reset_routes or netdev_vport_reset_names instead. */
+static int
+netdev_vport_reset_name_else_route(bool is_name)
+{
+ int error;
+ int nlmsg_type;
+ struct nl_dump dump;
+ struct rtgenmsg *rtmsg;
+ struct ofpbuf request, reply;
+ static struct nl_sock *rtnl_sock;
+
+ if (is_name) {
+ struct name_node *nn, *nn_next;
+
+ HMAP_FOR_EACH_SAFE(nn, nn_next, node, &name_map) {
+ hmap_remove(&name_map, &nn->node);
+ free(nn);
+ }
+ } else {
+ struct route_node *rn, *rn_next;
+
+ HMAP_FOR_EACH_SAFE(rn, rn_next, node, &route_map) {
+ hmap_remove(&route_map, &rn->node);
+ free(rn);
+ }
+ }
+
+ error = nl_sock_create(NETLINK_ROUTE, 0, 0, 0, &rtnl_sock);
+ if (error) {
+ VLOG_WARN_RL(&rl, "Failed to create NETLINK_ROUTE socket");
+ return error;
+ }
+
+ ofpbuf_init(&request, 0);
+
+ nlmsg_type = is_name ? RTM_GETLINK : RTM_GETROUTE;
+ nl_msg_put_nlmsghdr(&request, sizeof *rtmsg, nlmsg_type, NLM_F_REQUEST);
+
+ rtmsg = ofpbuf_put_zeros(&request, sizeof *rtmsg);
+ rtmsg->rtgen_family = AF_INET;
+
+ nl_dump_start(&dump, rtnl_sock, &request);
+
+ while (nl_dump_next(&dump, &reply)) {
+ if (is_name) {
+ struct rtnetlink_link_change change;
+
+ if (rtnetlink_link_parse(&reply, &change)) {
+ netdev_vport_link_change(&change, NULL);
+ }
+ } else {
+ struct rtnetlink_route_change change;
+
+ if (rtnetlink_route_parse(&reply, &change)) {
+ netdev_vport_route_change(&change, NULL);
+ }
+ }
+ }
+
+ error = nl_dump_done(&dump);
+ nl_sock_destroy(rtnl_sock);
+
+ return error;
+}
+
+static int
+netdev_vport_reset_routes(void)
+{
+ return netdev_vport_reset_name_else_route(false);
+}
+
+static int
+netdev_vport_reset_names(void)
+{
+ return netdev_vport_reset_name_else_route(true);
+}
+
+static void
+netdev_vport_route_change(const struct rtnetlink_route_change *change,
+ void *aux OVS_UNUSED)
+{
+
+ if (!change) {
+ netdev_vport_reset_routes();
+ } else if (change->nlmsg_type == RTM_NEWROUTE) {
+ uint32_t hash;
+ struct route_node *rn;
+
+ if (route_node_lookup(change->rta_oif, change->rta_dst,
+ change->rtm_dst_len)) {
+ return;
+ }
+
+ rn = xzalloc(sizeof *rn);
+ rn->rta_oif = change->rta_oif;
+ rn->rta_dst = change->rta_dst;
+ rn->rtm_dst_len = change->rtm_dst_len;
+
+ hash = hash_3words(rn->rta_oif, rn->rta_dst, rn->rtm_dst_len);
+ hmap_insert(&route_map, &rn->node, hash);
+ } else if (change->nlmsg_type == RTM_DELROUTE) {
+ struct route_node *rn;
+
+ rn = route_node_lookup(change->rta_oif, change->rta_dst,
+ change->rtm_dst_len);
+
+ if (rn) {
+ hmap_remove(&route_map, &rn->node);
+ free(rn);
+ }
+ } else {
+ VLOG_WARN_RL(&rl, "Received unexpected rtnetlink message type %d",
+ change->nlmsg_type);
+ }
+}
+
+static void
+netdev_vport_link_change(const struct rtnetlink_link_change *change,
+ void *aux OVS_UNUSED)
+{
+
+ if (!change) {
+ netdev_vport_reset_names();
+ } else if (change->nlmsg_type == RTM_NEWLINK) {
+ struct name_node *nn;
+
+ if (name_node_lookup(change->ifi_index)) {
+ return;
+ }
+
+ nn = xzalloc(sizeof *nn);
+ nn->ifi_index = change->ifi_index;
+
+ strncpy(nn->ifname, change->ifname, IFNAMSIZ);
+ nn->ifname[IFNAMSIZ - 1] = '\0';
+
+ hmap_insert(&name_map, &nn->node, hash_int(nn->ifi_index, 0));
+ } else if (change->nlmsg_type == RTM_DELLINK) {
+ struct name_node *nn;
+
+ nn = name_node_lookup(change->ifi_index);
+
+ if (nn) {
+ hmap_remove(&name_map, &nn->node);
+ free(nn);
+ }
+
+ /* Link deletions do not result in all of the RTM_DELROUTE messages one
+ * would expect. For now, go ahead and reset route_map whenever a link
+ * is deleted. */
+ netdev_vport_reset_routes();
+ } else {
+ VLOG_WARN_RL(&rl, "Received unexpected rtnetlink message type %d",
+ change->nlmsg_type);
+ }
+}
+
+static void
+netdev_vport_tnl_iface_init(void)
+{
+ static bool tnl_iface_is_init = false;
+
+ if (!tnl_iface_is_init) {
+ hmap_init(&name_map);
+ hmap_init(&route_map);
+
+ rtnetlink_link_notifier_register(&netdev_vport_link_notifier,
+ netdev_vport_link_change, NULL);
+
+ rtnetlink_route_notifier_register(&netdev_vport_route_notifier,
+ netdev_vport_route_change, NULL);
+
+ netdev_vport_reset_names();
+ netdev_vport_reset_routes();
+ tnl_iface_is_init = true;
+ }
+}
+
+static const char *
+netdev_vport_get_tnl_iface(const struct netdev *netdev)
+{
+ int dst_len;
+ uint32_t route;
+ struct netdev_dev_vport *ndv;
+ struct tnl_port_config *config;
+ struct route_node *rn, *rn_def, *rn_iter;
+
+ ndv = netdev_dev_vport_cast(netdev_get_dev(netdev));
+ config = (struct tnl_port_config *) ndv->config;
+ route = ntohl(config->daddr);
+
+ dst_len = 0;
+ rn = NULL;
+ rn_def = NULL;
+
+ HMAP_FOR_EACH(rn_iter, node, &route_map) {
+ if (rn_iter->rtm_dst_len == 0 && rn_iter->rta_dst == 0) {
+ /* Default route. */
+ rn_def = rn_iter;
+ } else if (rn_iter->rtm_dst_len > dst_len) {
+ uint32_t mask = 0xffffffff << (32 - rn_iter->rtm_dst_len);
+ if ((route & mask) == (rn_iter->rta_dst & mask)) {
+ rn = rn_iter;
+ dst_len = rn_iter->rtm_dst_len;
+ }
+ }
+ }
+
+ if (!rn) {
+ rn = rn_def;
+ }
+
+ if (rn) {
+ uint32_t hash;
+ struct name_node *nn;
+
+ hash = hash_int(rn->rta_oif, 0);
+ HMAP_FOR_EACH_WITH_HASH(nn, node, hash, &name_map) {
+ if (nn->ifi_index == rn->rta_oif) {
+ return nn->ifname;
+ }
+ }
+ }
+
+ return NULL;
+}
\f
/* Helper functions. */
}
} else if (!strcmp(node->name, "psk") && is_ipsec) {
ipsec_mech_set = true;
- } else if (is_ipsec
+ } else if (is_ipsec
&& (!strcmp(node->name, "certificate")
|| !strcmp(node->name, "private_key")
|| !strcmp(node->name, "use_ssl_cert"))) {
return 0;
}
\f
-#define VPORT_FUNCTIONS \
- NULL, /* init */ \
- NULL, /* run */ \
- NULL, /* wait */ \
+#define VPORT_FUNCTIONS(TNL_IFACE) \
+ netdev_vport_init, \
+ netdev_vport_run, \
+ netdev_vport_wait, \
\
netdev_vport_create, \
netdev_vport_destroy, \
NULL, /* get_in6 */ \
NULL, /* add_router */ \
NULL, /* get_next_hop */ \
+ TNL_IFACE, \
NULL, /* arp_lookup */ \
\
netdev_vport_update_flags, \
netdev_vport_register(void)
{
static const struct vport_class vport_classes[] = {
- { { "gre", VPORT_FUNCTIONS }, parse_tunnel_config },
- { { "ipsec_gre", VPORT_FUNCTIONS }, parse_tunnel_config },
- { { "capwap", VPORT_FUNCTIONS }, parse_tunnel_config },
- { { "patch", VPORT_FUNCTIONS }, parse_patch_config }
+ { { "gre", VPORT_FUNCTIONS(netdev_vport_get_tnl_iface) },
+ parse_tunnel_config },
+ { { "ipsec_gre", VPORT_FUNCTIONS(netdev_vport_get_tnl_iface) },
+ parse_tunnel_config },
+ { { "capwap", VPORT_FUNCTIONS(netdev_vport_get_tnl_iface) },
+ parse_tunnel_config },
+ { { "patch", VPORT_FUNCTIONS(NULL) }, parse_patch_config }
};
int i;
--- /dev/null
+/*
+ * Copyright (c) 2009, 2010 Nicira Networks.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <config.h>
+
+#include "rtnetlink-route.h"
+
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <linux/rtnetlink.h>
+#include <net/if.h>
+
+#include "netlink.h"
+#include "ofpbuf.h"
+#include "rtnetlink.h"
+
+static struct rtnetlink *rtn = NULL;
+static struct rtnetlink_route_change rtn_change;
+
+/* Parses a rtnetlink message 'buf' into 'change'. If 'buf' is unparseable,
+ * leaves 'change' untouched and returns false. Otherwise, populates 'change'
+ * and returns true. */
+bool
+rtnetlink_route_parse(struct ofpbuf *buf,
+ struct rtnetlink_route_change *change)
+{
+ bool parsed;
+
+ static const struct nl_policy policy[] = {
+ [RTA_DST] = { .type = NL_A_U32, .optional = true },
+ [RTA_OIF] = { .type = NL_A_U32, .optional = false },
+ };
+
+ static struct nlattr *attrs[ARRAY_SIZE(policy)];
+
+ parsed = nl_policy_parse(buf, NLMSG_HDRLEN + sizeof(struct rtmsg),
+ policy, attrs, ARRAY_SIZE(policy));
+
+ if (parsed) {
+ const struct nlmsghdr *nlmsg;
+ const struct rtmsg *rtm;
+
+ nlmsg = buf->data;
+ rtm = (const struct rtmsg *) ((const char *) buf->data + NLMSG_HDRLEN);
+
+ if (rtm->rtm_family != AF_INET) {
+ return false;
+ }
+
+ change->nlmsg_type = nlmsg->nlmsg_type;
+ change->rtm_dst_len = rtm->rtm_dst_len;
+ change->rta_oif = nl_attr_get_u32(attrs[RTA_OIF]);
+ change->rta_dst = (attrs[RTA_DST]
+ ? ntohl(nl_attr_get_be32(attrs[RTA_DST]))
+ : 0);
+ }
+
+ return parsed;
+}
+
+/* Registers 'cb' to be called with auxiliary data 'aux' with route change
+ * notifications. The notifier is stored in 'notifier', which callers must
+ * not modify or free.
+ *
+ * Returns 0 if successful, otherwise a positive errno value. */
+int
+rtnetlink_route_notifier_register(struct rtnetlink_notifier *notifier,
+ rtnetlink_route_notify_func *cb, void *aux)
+{
+ rtnetlink_parse_func *pf = (rtnetlink_parse_func *) rtnetlink_route_parse;
+ rtnetlink_notify_func *nf = (rtnetlink_notify_func *) cb;
+
+ if (!rtn) {
+ rtn = rtnetlink_create(RTNLGRP_IPV4_ROUTE, pf, &rtn_change);
+ }
+
+ return rtnetlink_notifier_register(rtn, notifier, nf, aux);
+}
+
+/* Cancels notification on 'notifier', which must have previously been
+ * registered with rtnetlink_route_notifier_register(). */
+void
+rtnetlink_route_notifier_unregister(struct rtnetlink_notifier *notifier)
+{
+ rtnetlink_notifier_unregister(rtn, notifier);
+}
+
+/* Calls all of the registered notifiers, passing along any as-yet-unreported
+ * address change events. */
+void
+rtnetlink_route_notifier_run(void)
+{
+ if (rtn) {
+ rtnetlink_notifier_run(rtn);
+ }
+}
+
+/* Causes poll_block() to wake up when address change notifications are ready.
+ */
+void
+rtnetlink_route_notifier_wait(void)
+{
+ if (rtn) {
+ rtnetlink_notifier_wait(rtn);
+ }
+}
--- /dev/null
+/*
+ * Copyright (c) 2009 Nicira Networks.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef RTNETLINK_ROUTE_H
+#define RTNETLINK_ROUTE_H 1
+
+#include <stdbool.h>
+#include <stdint.h>
+
+struct ofpbuf;
+struct rtnetlink_notifier;
+
+/* A digested version of a route message sent down by the kernel to indicate
+ * that a route has changed. */
+struct rtnetlink_route_change {
+ /* Copied from struct nlmsghdr. */
+ int nlmsg_type; /* e.g. RTM_NEWROUTE, RTM_DELROUTE. */
+
+ /* Copied from struct rtmsg. */
+ unsigned char rtm_dst_len;
+
+ /* Extracted from Netlink attributes. */
+ uint32_t rta_dst; /* Destination in host byte order. 0 if missing. */
+ int rta_oif; /* Output interface index. */
+};
+
+/* Function called to report that a route has changed. 'change' describes
+ * the specific change. It may be null, in which case the function must assume
+ * everything has changed. 'aux' is as specified in the call to
+ * rtnetlink_route_notifier_register(). */
+typedef
+void rtnetlink_route_notify_func(const struct rtnetlink_route_change *change,
+ void *aux);
+
+bool rtnetlink_route_parse(struct ofpbuf *, struct rtnetlink_route_change *);
+int rtnetlink_route_notifier_register(struct rtnetlink_notifier *,
+ rtnetlink_route_notify_func *, void *aux);
+void rtnetlink_route_notifier_unregister(struct rtnetlink_notifier *);
+void rtnetlink_route_notifier_run(void);
+void rtnetlink_route_notifier_wait(void);
+
+#endif /* rtnetlink-route.h */
projects / openvswitch / commitdiff