net: Add Open vSwitch kernel components.
Open vSwitch is a multilayer Ethernet switch targeted at virtualized
environments. In addition to supporting a variety of features
expected in a traditional hardware switch, it enables fine-grained
programmatic extension and flow-based control of the network.
This control is useful in a wide variety of applications but is
particularly important in multi-server virtualization deployments,
which are often characterized by highly dynamic endpoints and the need
to maintain logical abstractions for multiple tenants.
The Open vSwitch datapath provides an in-kernel fast path for packet
forwarding. It is complemented by a userspace daemon, ovs-vswitchd,
which is able to accept configuration from a variety of sources and
translate it into packet processing rules.
See http://openvswitch.org for more information and userspace
utilities.
Signed-off-by: Jesse Gross <jesse@nicira.com>
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
new file mode 100644
index 0000000..9a27251
--- /dev/null
+++ b/net/openvswitch/datapath.c
@@ -0,0 +1,1912 @@
+/*
+ * Copyright (c) 2007-2011 Nicira Networks.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/if_arp.h>
+#include <linux/if_vlan.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/jhash.h>
+#include <linux/delay.h>
+#include <linux/time.h>
+#include <linux/etherdevice.h>
+#include <linux/genetlink.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/mutex.h>
+#include <linux/percpu.h>
+#include <linux/rcupdate.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/version.h>
+#include <linux/ethtool.h>
+#include <linux/wait.h>
+#include <asm/system.h>
+#include <asm/div64.h>
+#include <linux/highmem.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/inetdevice.h>
+#include <linux/list.h>
+#include <linux/openvswitch.h>
+#include <linux/rculist.h>
+#include <linux/dmi.h>
+#include <linux/workqueue.h>
+#include <net/genetlink.h>
+
+#include "datapath.h"
+#include "flow.h"
+#include "vport-internal_dev.h"
+
+/**
+ * DOC: Locking:
+ *
+ * Writes to device state (add/remove datapath, port, set operations on vports,
+ * etc.) are protected by RTNL.
+ *
+ * Writes to other state (flow table modifications, set miscellaneous datapath
+ * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside
+ * genl_mutex.
+ *
+ * Reads are protected by RCU.
+ *
+ * There are a few special cases (mostly stats) that have their own
+ * synchronization but they nest under all of above and don't interact with
+ * each other.
+ */
+
+/* Global list of datapaths to enable dumping them all out.
+ * Protected by genl_mutex.
+ */
+static LIST_HEAD(dps);
+
+#define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
+static void rehash_flow_table(struct work_struct *work);
+static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
+
+static struct vport *new_vport(const struct vport_parms *);
+static int queue_gso_packets(int dp_ifindex, struct sk_buff *,
+ const struct dp_upcall_info *);
+static int queue_userspace_packet(int dp_ifindex, struct sk_buff *,
+ const struct dp_upcall_info *);
+
+/* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
+static struct datapath *get_dp(int dp_ifindex)
+{
+ struct datapath *dp = NULL;
+ struct net_device *dev;
+
+ rcu_read_lock();
+ dev = dev_get_by_index_rcu(&init_net, dp_ifindex);
+ if (dev) {
+ struct vport *vport = ovs_internal_dev_get_vport(dev);
+ if (vport)
+ dp = vport->dp;
+ }
+ rcu_read_unlock();
+
+ return dp;
+}
+
+/* Must be called with rcu_read_lock or RTNL lock. */
+const char *ovs_dp_name(const struct datapath *dp)
+{
+ struct vport *vport = rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]);
+ return vport->ops->get_name(vport);
+}
+
+static int get_dpifindex(struct datapath *dp)
+{
+ struct vport *local;
+ int ifindex;
+
+ rcu_read_lock();
+
+ local = rcu_dereference(dp->ports[OVSP_LOCAL]);
+ if (local)
+ ifindex = local->ops->get_ifindex(local);
+ else
+ ifindex = 0;
+
+ rcu_read_unlock();
+
+ return ifindex;
+}
+
+static void destroy_dp_rcu(struct rcu_head *rcu)
+{
+ struct datapath *dp = container_of(rcu, struct datapath, rcu);
+
+ ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
+ free_percpu(dp->stats_percpu);
+ kfree(dp);
+}
+
+/* Called with RTNL lock and genl_lock. */
+static struct vport *new_vport(const struct vport_parms *parms)
+{
+ struct vport *vport;
+
+ vport = ovs_vport_add(parms);
+ if (!IS_ERR(vport)) {
+ struct datapath *dp = parms->dp;
+
+ rcu_assign_pointer(dp->ports[parms->port_no], vport);
+ list_add(&vport->node, &dp->port_list);
+ }
+
+ return vport;
+}
+
+/* Called with RTNL lock. */
+void ovs_dp_detach_port(struct vport *p)
+{
+ ASSERT_RTNL();
+
+ /* First drop references to device. */
+ list_del(&p->node);
+ rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
+
+ /* Then destroy it. */
+ ovs_vport_del(p);
+}
+
+/* Must be called with rcu_read_lock. */
+void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
+{
+ struct datapath *dp = p->dp;
+ struct sw_flow *flow;
+ struct dp_stats_percpu *stats;
+ struct sw_flow_key key;
+ u64 *stats_counter;
+ int error;
+ int key_len;
+
+ stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
+
+ /* Extract flow from 'skb' into 'key'. */
+ error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
+ if (unlikely(error)) {
+ kfree_skb(skb);
+ return;
+ }
+
+ /* Look up flow. */
+ flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
+ if (unlikely(!flow)) {
+ struct dp_upcall_info upcall;
+
+ upcall.cmd = OVS_PACKET_CMD_MISS;
+ upcall.key = &key;
+ upcall.userdata = NULL;
+ upcall.pid = p->upcall_pid;
+ ovs_dp_upcall(dp, skb, &upcall);
+ consume_skb(skb);
+ stats_counter = &stats->n_missed;
+ goto out;
+ }
+
+ OVS_CB(skb)->flow = flow;
+
+ stats_counter = &stats->n_hit;
+ ovs_flow_used(OVS_CB(skb)->flow, skb);
+ ovs_execute_actions(dp, skb);
+
+out:
+ /* Update datapath statistics. */
+ u64_stats_update_begin(&stats->sync);
+ (*stats_counter)++;
+ u64_stats_update_end(&stats->sync);
+}
+
+static struct genl_family dp_packet_genl_family = {
+ .id = GENL_ID_GENERATE,
+ .hdrsize = sizeof(struct ovs_header),
+ .name = OVS_PACKET_FAMILY,
+ .version = OVS_PACKET_VERSION,
+ .maxattr = OVS_PACKET_ATTR_MAX
+};
+
+int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
+ const struct dp_upcall_info *upcall_info)
+{
+ struct dp_stats_percpu *stats;
+ int dp_ifindex;
+ int err;
+
+ if (upcall_info->pid == 0) {
+ err = -ENOTCONN;
+ goto err;
+ }
+
+ dp_ifindex = get_dpifindex(dp);
+ if (!dp_ifindex) {
+ err = -ENODEV;
+ goto err;
+ }
+
+ if (!skb_is_gso(skb))
+ err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
+ else
+ err = queue_gso_packets(dp_ifindex, skb, upcall_info);
+ if (err)
+ goto err;
+
+ return 0;
+
+err:
+ stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
+
+ u64_stats_update_begin(&stats->sync);
+ stats->n_lost++;
+ u64_stats_update_end(&stats->sync);
+
+ return err;
+}
+
+static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb,
+ const struct dp_upcall_info *upcall_info)
+{
+ struct dp_upcall_info later_info;
+ struct sw_flow_key later_key;
+ struct sk_buff *segs, *nskb;
+ int err;
+
+ segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
+ if (IS_ERR(skb))
+ return PTR_ERR(skb);
+
+ /* Queue all of the segments. */
+ skb = segs;
+ do {
+ err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
+ if (err)
+ break;
+
+ if (skb == segs && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) {
+ /* The initial flow key extracted by ovs_flow_extract()
+ * in this case is for a first fragment, so we need to
+ * properly mark later fragments.
+ */
+ later_key = *upcall_info->key;
+ later_key.ip.frag = OVS_FRAG_TYPE_LATER;
+
+ later_info = *upcall_info;
+ later_info.key = &later_key;
+ upcall_info = &later_info;
+ }
+ } while ((skb = skb->next));
+
+ /* Free all of the segments. */
+ skb = segs;
+ do {
+ nskb = skb->next;
+ if (err)
+ kfree_skb(skb);
+ else
+ consume_skb(skb);
+ } while ((skb = nskb));
+ return err;
+}
+
+static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb,
+ const struct dp_upcall_info *upcall_info)
+{
+ struct ovs_header *upcall;
+ struct sk_buff *nskb = NULL;
+ struct sk_buff *user_skb; /* to be queued to userspace */
+ struct nlattr *nla;
+ unsigned int len;
+ int err;
+
+ if (vlan_tx_tag_present(skb)) {
+ nskb = skb_clone(skb, GFP_ATOMIC);
+ if (!nskb)
+ return -ENOMEM;
+
+ nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb));
+ if (!skb)
+ return -ENOMEM;
+
+ nskb->vlan_tci = 0;
+ skb = nskb;
+ }
+
+ if (nla_attr_size(skb->len) > USHRT_MAX) {
+ err = -EFBIG;
+ goto out;
+ }
+
+ len = sizeof(struct ovs_header);
+ len += nla_total_size(skb->len);
+ len += nla_total_size(FLOW_BUFSIZE);
+ if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
+ len += nla_total_size(8);
+
+ user_skb = genlmsg_new(len, GFP_ATOMIC);
+ if (!user_skb) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
+ 0, upcall_info->cmd);
+ upcall->dp_ifindex = dp_ifindex;
+
+ nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
+ ovs_flow_to_nlattrs(upcall_info->key, user_skb);
+ nla_nest_end(user_skb, nla);
+
+ if (upcall_info->userdata)
+ nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
+ nla_get_u64(upcall_info->userdata));
+
+ nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
+
+ skb_copy_and_csum_dev(skb, nla_data(nla));
+
+ err = genlmsg_unicast(&init_net, user_skb, upcall_info->pid);
+
+out:
+ kfree_skb(nskb);
+ return err;
+}
+
+/* Called with genl_mutex. */
+static int flush_flows(int dp_ifindex)
+{
+ struct flow_table *old_table;
+ struct flow_table *new_table;
+ struct datapath *dp;
+
+ dp = get_dp(dp_ifindex);
+ if (!dp)
+ return -ENODEV;
+
+ old_table = genl_dereference(dp->table);
+ new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
+ if (!new_table)
+ return -ENOMEM;
+
+ rcu_assign_pointer(dp->table, new_table);
+
+ ovs_flow_tbl_deferred_destroy(old_table);
+ return 0;
+}
+
+static int validate_actions(const struct nlattr *attr,
+ const struct sw_flow_key *key, int depth);
+
+static int validate_sample(const struct nlattr *attr,
+ const struct sw_flow_key *key, int depth)
+{
+ const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
+ const struct nlattr *probability, *actions;
+ const struct nlattr *a;
+ int rem;
+
+ memset(attrs, 0, sizeof(attrs));
+ nla_for_each_nested(a, attr, rem) {
+ int type = nla_type(a);
+ if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
+ return -EINVAL;
+ attrs[type] = a;
+ }
+ if (rem)
+ return -EINVAL;
+
+ probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
+ if (!probability || nla_len(probability) != sizeof(u32))
+ return -EINVAL;
+
+ actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
+ if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
+ return -EINVAL;
+ return validate_actions(actions, key, depth + 1);
+}
+
+static int validate_set(const struct nlattr *a,
+ const struct sw_flow_key *flow_key)
+{
+ const struct nlattr *ovs_key = nla_data(a);
+ int key_type = nla_type(ovs_key);
+
+ /* There can be only one key in a action */
+ if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
+ return -EINVAL;
+
+ if (key_type > OVS_KEY_ATTR_MAX ||
+ nla_len(ovs_key) != ovs_key_lens[key_type])
+ return -EINVAL;
+
+ switch (key_type) {
+ const struct ovs_key_ipv4 *ipv4_key;
+
+ case OVS_KEY_ATTR_PRIORITY:
+ case OVS_KEY_ATTR_ETHERNET:
+ break;
+
+ case OVS_KEY_ATTR_IPV4:
+ if (flow_key->eth.type != htons(ETH_P_IP))
+ return -EINVAL;
+
+ if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst)
+ return -EINVAL;
+
+ ipv4_key = nla_data(ovs_key);
+ if (ipv4_key->ipv4_proto != flow_key->ip.proto)
+ return -EINVAL;
+
+ if (ipv4_key->ipv4_frag != flow_key->ip.frag)
+ return -EINVAL;
+
+ break;
+
+ case OVS_KEY_ATTR_TCP:
+ if (flow_key->ip.proto != IPPROTO_TCP)
+ return -EINVAL;
+
+ if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst)
+ return -EINVAL;
+
+ break;
+
+ case OVS_KEY_ATTR_UDP:
+ if (flow_key->ip.proto != IPPROTO_UDP)
+ return -EINVAL;
+
+ if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst)
+ return -EINVAL;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int validate_userspace(const struct nlattr *attr)
+{
+ static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
+ [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
+ [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
+ };
+ struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
+ int error;
+
+ error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
+ attr, userspace_policy);
+ if (error)
+ return error;
+
+ if (!a[OVS_USERSPACE_ATTR_PID] ||
+ !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int validate_actions(const struct nlattr *attr,
+ const struct sw_flow_key *key, int depth)
+{
+ const struct nlattr *a;
+ int rem, err;
+
+ if (depth >= SAMPLE_ACTION_DEPTH)
+ return -EOVERFLOW;
+
+ nla_for_each_nested(a, attr, rem) {
+ /* Expected argument lengths, (u32)-1 for variable length. */
+ static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
+ [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
+ [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
+ [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
+ [OVS_ACTION_ATTR_POP_VLAN] = 0,
+ [OVS_ACTION_ATTR_SET] = (u32)-1,
+ [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
+ };
+ const struct ovs_action_push_vlan *vlan;
+ int type = nla_type(a);
+
+ if (type > OVS_ACTION_ATTR_MAX ||
+ (action_lens[type] != nla_len(a) &&
+ action_lens[type] != (u32)-1))
+ return -EINVAL;
+
+ switch (type) {
+ case OVS_ACTION_ATTR_UNSPEC:
+ return -EINVAL;
+
+ case OVS_ACTION_ATTR_USERSPACE:
+ err = validate_userspace(a);
+ if (err)
+ return err;
+ break;
+
+ case OVS_ACTION_ATTR_OUTPUT:
+ if (nla_get_u32(a) >= DP_MAX_PORTS)
+ return -EINVAL;
+ break;
+
+
+ case OVS_ACTION_ATTR_POP_VLAN:
+ break;
+
+ case OVS_ACTION_ATTR_PUSH_VLAN:
+ vlan = nla_data(a);
+ if (vlan->vlan_tpid != htons(ETH_P_8021Q))
+ return -EINVAL;
+ if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
+ return -EINVAL;
+ break;
+
+ case OVS_ACTION_ATTR_SET:
+ err = validate_set(a, key);
+ if (err)
+ return err;
+ break;
+
+ case OVS_ACTION_ATTR_SAMPLE:
+ err = validate_sample(a, key, depth);
+ if (err)
+ return err;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+ }
+
+ if (rem > 0)
+ return -EINVAL;
+
+ return 0;
+}
+
+static void clear_stats(struct sw_flow *flow)
+{
+ flow->used = 0;
+ flow->tcp_flags = 0;
+ flow->packet_count = 0;
+ flow->byte_count = 0;
+}
+
+static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
+{
+ struct ovs_header *ovs_header = info->userhdr;
+ struct nlattr **a = info->attrs;
+ struct sw_flow_actions *acts;
+ struct sk_buff *packet;
+ struct sw_flow *flow;
+ struct datapath *dp;
+ struct ethhdr *eth;
+ int len;
+ int err;
+ int key_len;
+
+ err = -EINVAL;
+ if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
+ !a[OVS_PACKET_ATTR_ACTIONS] ||
+ nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
+ goto err;
+
+ len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
+ packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
+ err = -ENOMEM;
+ if (!packet)
+ goto err;
+ skb_reserve(packet, NET_IP_ALIGN);
+
+ memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
+
+ skb_reset_mac_header(packet);
+ eth = eth_hdr(packet);
+
+ /* Normally, setting the skb 'protocol' field would be handled by a
+ * call to eth_type_trans(), but it assumes there's a sending
+ * device, which we may not have. */
+ if (ntohs(eth->h_proto) >= 1536)
+ packet->protocol = eth->h_proto;
+ else
+ packet->protocol = htons(ETH_P_802_2);
+
+ /* Build an sw_flow for sending this packet. */
+ flow = ovs_flow_alloc();
+ err = PTR_ERR(flow);
+ if (IS_ERR(flow))
+ goto err_kfree_skb;
+
+ err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
+ if (err)
+ goto err_flow_free;
+
+ err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
+ &flow->key.phy.in_port,
+ a[OVS_PACKET_ATTR_KEY]);
+ if (err)
+ goto err_flow_free;
+
+ err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
+ if (err)
+ goto err_flow_free;
+
+ flow->hash = ovs_flow_hash(&flow->key, key_len);
+
+ acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
+ err = PTR_ERR(acts);
+ if (IS_ERR(acts))
+ goto err_flow_free;
+ rcu_assign_pointer(flow->sf_acts, acts);
+
+ OVS_CB(packet)->flow = flow;
+ packet->priority = flow->key.phy.priority;
+
+ rcu_read_lock();
+ dp = get_dp(ovs_header->dp_ifindex);
+ err = -ENODEV;
+ if (!dp)
+ goto err_unlock;
+
+ local_bh_disable();
+ err = ovs_execute_actions(dp, packet);
+ local_bh_enable();
+ rcu_read_unlock();
+
+ ovs_flow_free(flow);
+ return err;
+
+err_unlock:
+ rcu_read_unlock();
+err_flow_free:
+ ovs_flow_free(flow);
+err_kfree_skb:
+ kfree_skb(packet);
+err:
+ return err;
+}
+
+static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
+ [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
+ [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
+ [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
+};
+
+static struct genl_ops dp_packet_genl_ops[] = {
+ { .cmd = OVS_PACKET_CMD_EXECUTE,
+ .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .policy = packet_policy,
+ .doit = ovs_packet_cmd_execute
+ }
+};
+
+static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
+{
+ int i;
+ struct flow_table *table = genl_dereference(dp->table);
+
+ stats->n_flows = ovs_flow_tbl_count(table);
+
+ stats->n_hit = stats->n_missed = stats->n_lost = 0;
+ for_each_possible_cpu(i) {
+ const struct dp_stats_percpu *percpu_stats;
+ struct dp_stats_percpu local_stats;
+ unsigned int start;
+
+ percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
+
+ do {
+ start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
+ local_stats = *percpu_stats;
+ } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
+
+ stats->n_hit += local_stats.n_hit;
+ stats->n_missed += local_stats.n_missed;
+ stats->n_lost += local_stats.n_lost;
+ }
+}
+
+static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
+ [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
+ [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
+ [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
+};
+
+static struct genl_family dp_flow_genl_family = {
+ .id = GENL_ID_GENERATE,
+ .hdrsize = sizeof(struct ovs_header),
+ .name = OVS_FLOW_FAMILY,
+ .version = OVS_FLOW_VERSION,
+ .maxattr = OVS_FLOW_ATTR_MAX
+};
+
+static struct genl_multicast_group ovs_dp_flow_multicast_group = {
+ .name = OVS_FLOW_MCGROUP
+};
+
+/* Called with genl_lock. */
+static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
+ struct sk_buff *skb, u32 pid,
+ u32 seq, u32 flags, u8 cmd)
+{
+ const int skb_orig_len = skb->len;
+ const struct sw_flow_actions *sf_acts;
+ struct ovs_flow_stats stats;
+ struct ovs_header *ovs_header;
+ struct nlattr *nla;
+ unsigned long used;
+ u8 tcp_flags;
+ int err;
+
+ sf_acts = rcu_dereference_protected(flow->sf_acts,
+ lockdep_genl_is_held());
+
+ ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd);
+ if (!ovs_header)
+ return -EMSGSIZE;
+
+ ovs_header->dp_ifindex = get_dpifindex(dp);
+
+ nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
+ if (!nla)
+ goto nla_put_failure;
+ err = ovs_flow_to_nlattrs(&flow->key, skb);
+ if (err)
+ goto error;
+ nla_nest_end(skb, nla);
+
+ spin_lock_bh(&flow->lock);
+ used = flow->used;
+ stats.n_packets = flow->packet_count;
+ stats.n_bytes = flow->byte_count;
+ tcp_flags = flow->tcp_flags;
+ spin_unlock_bh(&flow->lock);
+
+ if (used)
+ NLA_PUT_U64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used));
+
+ if (stats.n_packets)
+ NLA_PUT(skb, OVS_FLOW_ATTR_STATS,
+ sizeof(struct ovs_flow_stats), &stats);
+
+ if (tcp_flags)
+ NLA_PUT_U8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags);
+
+ /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
+ * this is the first flow to be dumped into 'skb'. This is unusual for
+ * Netlink but individual action lists can be longer than
+ * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
+ * The userspace caller can always fetch the actions separately if it
+ * really wants them. (Most userspace callers in fact don't care.)
+ *
+ * This can only fail for dump operations because the skb is always
+ * properly sized for single flows.
+ */
+ err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
+ sf_acts->actions);
+ if (err < 0 && skb_orig_len)
+ goto error;
+
+ return genlmsg_end(skb, ovs_header);
+
+nla_put_failure:
+ err = -EMSGSIZE;
+error:
+ genlmsg_cancel(skb, ovs_header);
+ return err;
+}
+
+static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
+{
+ const struct sw_flow_actions *sf_acts;
+ int len;
+
+ sf_acts = rcu_dereference_protected(flow->sf_acts,
+ lockdep_genl_is_held());
+
+ /* OVS_FLOW_ATTR_KEY */
+ len = nla_total_size(FLOW_BUFSIZE);
+ /* OVS_FLOW_ATTR_ACTIONS */
+ len += nla_total_size(sf_acts->actions_len);
+ /* OVS_FLOW_ATTR_STATS */
+ len += nla_total_size(sizeof(struct ovs_flow_stats));
+ /* OVS_FLOW_ATTR_TCP_FLAGS */
+ len += nla_total_size(1);
+ /* OVS_FLOW_ATTR_USED */
+ len += nla_total_size(8);
+
+ len += NLMSG_ALIGN(sizeof(struct ovs_header));
+
+ return genlmsg_new(len, GFP_KERNEL);
+}
+
+static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
+ struct datapath *dp,
+ u32 pid, u32 seq, u8 cmd)
+{
+ struct sk_buff *skb;
+ int retval;
+
+ skb = ovs_flow_cmd_alloc_info(flow);
+ if (!skb)
+ return ERR_PTR(-ENOMEM);
+
+ retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd);
+ BUG_ON(retval < 0);
+ return skb;
+}
+
+static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr **a = info->attrs;
+ struct ovs_header *ovs_header = info->userhdr;
+ struct sw_flow_key key;
+ struct sw_flow *flow;
+ struct sk_buff *reply;
+ struct datapath *dp;
+ struct flow_table *table;
+ int error;
+ int key_len;
+
+ /* Extract key. */
+ error = -EINVAL;
+ if (!a[OVS_FLOW_ATTR_KEY])
+ goto error;
+ error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
+ if (error)
+ goto error;
+
+ /* Validate actions. */
+ if (a[OVS_FLOW_ATTR_ACTIONS]) {
+ error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0);
+ if (error)
+ goto error;
+ } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
+ error = -EINVAL;
+ goto error;
+ }
+
+ dp = get_dp(ovs_header->dp_ifindex);
+ error = -ENODEV;
+ if (!dp)
+ goto error;
+
+ table = genl_dereference(dp->table);
+ flow = ovs_flow_tbl_lookup(table, &key, key_len);
+ if (!flow) {
+ struct sw_flow_actions *acts;
+
+ /* Bail out if we're not allowed to create a new flow. */
+ error = -ENOENT;
+ if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
+ goto error;
+
+ /* Expand table, if necessary, to make room. */
+ if (ovs_flow_tbl_need_to_expand(table)) {
+ struct flow_table *new_table;
+
+ new_table = ovs_flow_tbl_expand(table);
+ if (!IS_ERR(new_table)) {
+ rcu_assign_pointer(dp->table, new_table);
+ ovs_flow_tbl_deferred_destroy(table);
+ table = genl_dereference(dp->table);
+ }
+ }
+
+ /* Allocate flow. */
+ flow = ovs_flow_alloc();
+ if (IS_ERR(flow)) {
+ error = PTR_ERR(flow);
+ goto error;
+ }
+ flow->key = key;
+ clear_stats(flow);
+
+ /* Obtain actions. */
+ acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
+ error = PTR_ERR(acts);
+ if (IS_ERR(acts))
+ goto error_free_flow;
+ rcu_assign_pointer(flow->sf_acts, acts);
+
+ /* Put flow in bucket. */
+ flow->hash = ovs_flow_hash(&key, key_len);
+ ovs_flow_tbl_insert(table, flow);
+
+ reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
+ info->snd_seq,
+ OVS_FLOW_CMD_NEW);
+ } else {
+ /* We found a matching flow. */
+ struct sw_flow_actions *old_acts;
+ struct nlattr *acts_attrs;
+
+ /* Bail out if we're not allowed to modify an existing flow.
+ * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
+ * because Generic Netlink treats the latter as a dump
+ * request. We also accept NLM_F_EXCL in case that bug ever
+ * gets fixed.
+ */
+ error = -EEXIST;
+ if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
+ info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
+ goto error;
+
+ /* Update actions. */
+ old_acts = rcu_dereference_protected(flow->sf_acts,
+ lockdep_genl_is_held());
+ acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
+ if (acts_attrs &&
+ (old_acts->actions_len != nla_len(acts_attrs) ||
+ memcmp(old_acts->actions, nla_data(acts_attrs),
+ old_acts->actions_len))) {
+ struct sw_flow_actions *new_acts;
+
+ new_acts = ovs_flow_actions_alloc(acts_attrs);
+ error = PTR_ERR(new_acts);
+ if (IS_ERR(new_acts))
+ goto error;
+
+ rcu_assign_pointer(flow->sf_acts, new_acts);
+ ovs_flow_deferred_free_acts(old_acts);
+ }
+
+ reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
+ info->snd_seq, OVS_FLOW_CMD_NEW);
+
+ /* Clear stats. */
+ if (a[OVS_FLOW_ATTR_CLEAR]) {
+ spin_lock_bh(&flow->lock);
+ clear_stats(flow);
+ spin_unlock_bh(&flow->lock);
+ }
+ }
+
+ if (!IS_ERR(reply))
+ genl_notify(reply, genl_info_net(info), info->snd_pid,
+ ovs_dp_flow_multicast_group.id, info->nlhdr,
+ GFP_KERNEL);
+ else
+ netlink_set_err(init_net.genl_sock, 0,
+ ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
+ return 0;
+
+error_free_flow:
+ ovs_flow_free(flow);
+error:
+ return error;
+}
+
+static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr **a = info->attrs;
+ struct ovs_header *ovs_header = info->userhdr;
+ struct sw_flow_key key;
+ struct sk_buff *reply;
+ struct sw_flow *flow;
+ struct datapath *dp;
+ struct flow_table *table;
+ int err;
+ int key_len;
+
+ if (!a[OVS_FLOW_ATTR_KEY])
+ return -EINVAL;
+ err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
+ if (err)
+ return err;
+
+ dp = get_dp(ovs_header->dp_ifindex);
+ if (!dp)
+ return -ENODEV;
+
+ table = genl_dereference(dp->table);
+ flow = ovs_flow_tbl_lookup(table, &key, key_len);
+ if (!flow)
+ return -ENOENT;
+
+ reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
+ info->snd_seq, OVS_FLOW_CMD_NEW);
+ if (IS_ERR(reply))
+ return PTR_ERR(reply);
+
+ return genlmsg_reply(reply, info);
+}
+
+static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr **a = info->attrs;
+ struct ovs_header *ovs_header = info->userhdr;
+ struct sw_flow_key key;
+ struct sk_buff *reply;
+ struct sw_flow *flow;
+ struct datapath *dp;
+ struct flow_table *table;
+ int err;
+ int key_len;
+
+ if (!a[OVS_FLOW_ATTR_KEY])
+ return flush_flows(ovs_header->dp_ifindex);
+ err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
+ if (err)
+ return err;
+
+ dp = get_dp(ovs_header->dp_ifindex);
+ if (!dp)
+ return -ENODEV;
+
+ table = genl_dereference(dp->table);
+ flow = ovs_flow_tbl_lookup(table, &key, key_len);
+ if (!flow)
+ return -ENOENT;
+
+ reply = ovs_flow_cmd_alloc_info(flow);
+ if (!reply)
+ return -ENOMEM;
+
+ ovs_flow_tbl_remove(table, flow);
+
+ err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid,
+ info->snd_seq, 0, OVS_FLOW_CMD_DEL);
+ BUG_ON(err < 0);
+
+ ovs_flow_deferred_free(flow);
+
+ genl_notify(reply, genl_info_net(info), info->snd_pid,
+ ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
+ return 0;
+}
+
+static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
+ struct datapath *dp;
+ struct flow_table *table;
+
+ dp = get_dp(ovs_header->dp_ifindex);
+ if (!dp)
+ return -ENODEV;
+
+ table = genl_dereference(dp->table);
+
+ for (;;) {
+ struct sw_flow *flow;
+ u32 bucket, obj;
+
+ bucket = cb->args[0];
+ obj = cb->args[1];
+ flow = ovs_flow_tbl_next(table, &bucket, &obj);
+ if (!flow)
+ break;
+
+ if (ovs_flow_cmd_fill_info(flow, dp, skb,
+ NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ OVS_FLOW_CMD_NEW) < 0)
+ break;
+
+ cb->args[0] = bucket;
+ cb->args[1] = obj;
+ }
+ return skb->len;
+}
+
+static struct genl_ops dp_flow_genl_ops[] = {
+ { .cmd = OVS_FLOW_CMD_NEW,
+ .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .policy = flow_policy,
+ .doit = ovs_flow_cmd_new_or_set
+ },
+ { .cmd = OVS_FLOW_CMD_DEL,
+ .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .policy = flow_policy,
+ .doit = ovs_flow_cmd_del
+ },
+ { .cmd = OVS_FLOW_CMD_GET,
+ .flags = 0, /* OK for unprivileged users. */
+ .policy = flow_policy,
+ .doit = ovs_flow_cmd_get,
+ .dumpit = ovs_flow_cmd_dump
+ },
+ { .cmd = OVS_FLOW_CMD_SET,
+ .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .policy = flow_policy,
+ .doit = ovs_flow_cmd_new_or_set,
+ },
+};
+
+static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
+ [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
+ [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
+};
+
+static struct genl_family dp_datapath_genl_family = {
+ .id = GENL_ID_GENERATE,
+ .hdrsize = sizeof(struct ovs_header),
+ .name = OVS_DATAPATH_FAMILY,
+ .version = OVS_DATAPATH_VERSION,
+ .maxattr = OVS_DP_ATTR_MAX
+};
+
+static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
+ .name = OVS_DATAPATH_MCGROUP
+};
+
+static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
+ u32 pid, u32 seq, u32 flags, u8 cmd)
+{
+ struct ovs_header *ovs_header;
+ struct ovs_dp_stats dp_stats;
+ int err;
+
+ ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family,
+ flags, cmd);
+ if (!ovs_header)
+ goto error;
+
+ ovs_header->dp_ifindex = get_dpifindex(dp);
+
+ rcu_read_lock();
+ err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
+ rcu_read_unlock();
+ if (err)
+ goto nla_put_failure;
+
+ get_dp_stats(dp, &dp_stats);
+ NLA_PUT(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats);
+
+ return genlmsg_end(skb, ovs_header);
+
+nla_put_failure:
+ genlmsg_cancel(skb, ovs_header);
+error:
+ return -EMSGSIZE;
+}
+
+static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid,
+ u32 seq, u8 cmd)
+{
+ struct sk_buff *skb;
+ int retval;
+
+ skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!skb)
+ return ERR_PTR(-ENOMEM);
+
+ retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd);
+ if (retval < 0) {
+ kfree_skb(skb);
+ return ERR_PTR(retval);
+ }
+ return skb;
+}
+
+/* Called with genl_mutex and optionally with RTNL lock also. */
+static struct datapath *lookup_datapath(struct ovs_header *ovs_header,
+ struct nlattr *a[OVS_DP_ATTR_MAX + 1])
+{
+ struct datapath *dp;
+
+ if (!a[OVS_DP_ATTR_NAME])
+ dp = get_dp(ovs_header->dp_ifindex);
+ else {
+ struct vport *vport;
+
+ rcu_read_lock();
+ vport = ovs_vport_locate(nla_data(a[OVS_DP_ATTR_NAME]));
+ dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
+ rcu_read_unlock();
+ }
+ return dp ? dp : ERR_PTR(-ENODEV);
+}
+
+static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr **a = info->attrs;
+ struct vport_parms parms;
+ struct sk_buff *reply;
+ struct datapath *dp;
+ struct vport *vport;
+ int err;
+
+ err = -EINVAL;
+ if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
+ goto err;
+
+ rtnl_lock();
+ err = -ENODEV;
+ if (!try_module_get(THIS_MODULE))
+ goto err_unlock_rtnl;
+
+ err = -ENOMEM;
+ dp = kzalloc(sizeof(*dp), GFP_KERNEL);
+ if (dp == NULL)
+ goto err_put_module;
+ INIT_LIST_HEAD(&dp->port_list);
+
+ /* Allocate table. */
+ err = -ENOMEM;
+ rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
+ if (!dp->table)
+ goto err_free_dp;
+
+ dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
+ if (!dp->stats_percpu) {
+ err = -ENOMEM;
+ goto err_destroy_table;
+ }
+
+ /* Set up our datapath device. */
+ parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
+ parms.type = OVS_VPORT_TYPE_INTERNAL;
+ parms.options = NULL;
+ parms.dp = dp;
+ parms.port_no = OVSP_LOCAL;
+ parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
+
+ vport = new_vport(&parms);
+ if (IS_ERR(vport)) {
+ err = PTR_ERR(vport);
+ if (err == -EBUSY)
+ err = -EEXIST;
+
+ goto err_destroy_percpu;
+ }
+
+ reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
+ info->snd_seq, OVS_DP_CMD_NEW);
+ err = PTR_ERR(reply);
+ if (IS_ERR(reply))
+ goto err_destroy_local_port;
+
+ list_add_tail(&dp->list_node, &dps);
+ rtnl_unlock();
+
+ genl_notify(reply, genl_info_net(info), info->snd_pid,
+ ovs_dp_datapath_multicast_group.id, info->nlhdr,
+ GFP_KERNEL);
+ return 0;
+
+err_destroy_local_port:
+ ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
+err_destroy_percpu:
+ free_percpu(dp->stats_percpu);
+err_destroy_table:
+ ovs_flow_tbl_destroy(genl_dereference(dp->table));
+err_free_dp:
+ kfree(dp);
+err_put_module:
+ module_put(THIS_MODULE);
+err_unlock_rtnl:
+ rtnl_unlock();
+err:
+ return err;
+}
+
+static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
+{
+ struct vport *vport, *next_vport;
+ struct sk_buff *reply;
+ struct datapath *dp;
+ int err;
+
+ rtnl_lock();
+ dp = lookup_datapath(info->userhdr, info->attrs);
+ err = PTR_ERR(dp);
+ if (IS_ERR(dp))
+ goto exit_unlock;
+
+ reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
+ info->snd_seq, OVS_DP_CMD_DEL);
+ err = PTR_ERR(reply);
+ if (IS_ERR(reply))
+ goto exit_unlock;
+
+ list_for_each_entry_safe(vport, next_vport, &dp->port_list, node)
+ if (vport->port_no != OVSP_LOCAL)
+ ovs_dp_detach_port(vport);
+
+ list_del(&dp->list_node);
+ ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
+
+ /* rtnl_unlock() will wait until all the references to devices that
+ * are pending unregistration have been dropped. We do it here to
+ * ensure that any internal devices (which contain DP pointers) are
+ * fully destroyed before freeing the datapath.
+ */
+ rtnl_unlock();
+
+ call_rcu(&dp->rcu, destroy_dp_rcu);
+ module_put(THIS_MODULE);
+
+ genl_notify(reply, genl_info_net(info), info->snd_pid,
+ ovs_dp_datapath_multicast_group.id, info->nlhdr,
+ GFP_KERNEL);
+
+ return 0;
+
+exit_unlock:
+ rtnl_unlock();
+ return err;
+}
+
+static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
+{
+ struct sk_buff *reply;
+ struct datapath *dp;
+ int err;
+
+ dp = lookup_datapath(info->userhdr, info->attrs);
+ if (IS_ERR(dp))
+ return PTR_ERR(dp);
+
+ reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
+ info->snd_seq, OVS_DP_CMD_NEW);
+ if (IS_ERR(reply)) {
+ err = PTR_ERR(reply);
+ netlink_set_err(init_net.genl_sock, 0,
+ ovs_dp_datapath_multicast_group.id, err);
+ return 0;
+ }
+
+ genl_notify(reply, genl_info_net(info), info->snd_pid,
+ ovs_dp_datapath_multicast_group.id, info->nlhdr,
+ GFP_KERNEL);
+
+ return 0;
+}
+
+static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
+{
+ struct sk_buff *reply;
+ struct datapath *dp;
+
+ dp = lookup_datapath(info->userhdr, info->attrs);
+ if (IS_ERR(dp))
+ return PTR_ERR(dp);
+
+ reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
+ info->snd_seq, OVS_DP_CMD_NEW);
+ if (IS_ERR(reply))
+ return PTR_ERR(reply);
+
+ return genlmsg_reply(reply, info);
+}
+
+static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct datapath *dp;
+ int skip = cb->args[0];
+ int i = 0;
+
+ list_for_each_entry(dp, &dps, list_node) {
+ if (i < skip)
+ continue;
+ if (ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ OVS_DP_CMD_NEW) < 0)
+ break;
+ i++;
+ }
+
+ cb->args[0] = i;
+
+ return skb->len;
+}
+
+static struct genl_ops dp_datapath_genl_ops[] = {
+ { .cmd = OVS_DP_CMD_NEW,
+ .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .policy = datapath_policy,
+ .doit = ovs_dp_cmd_new
+ },
+ { .cmd = OVS_DP_CMD_DEL,
+ .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .policy = datapath_policy,
+ .doit = ovs_dp_cmd_del
+ },
+ { .cmd = OVS_DP_CMD_GET,
+ .flags = 0, /* OK for unprivileged users. */
+ .policy = datapath_policy,
+ .doit = ovs_dp_cmd_get,
+ .dumpit = ovs_dp_cmd_dump
+ },
+ { .cmd = OVS_DP_CMD_SET,
+ .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .policy = datapath_policy,
+ .doit = ovs_dp_cmd_set,
+ },
+};
+
+static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
+ [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
+ [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
+ [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
+ [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
+ [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
+ [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
+};
+
+static struct genl_family dp_vport_genl_family = {
+ .id = GENL_ID_GENERATE,
+ .hdrsize = sizeof(struct ovs_header),
+ .name = OVS_VPORT_FAMILY,
+ .version = OVS_VPORT_VERSION,
+ .maxattr = OVS_VPORT_ATTR_MAX
+};
+
+struct genl_multicast_group ovs_dp_vport_multicast_group = {
+ .name = OVS_VPORT_MCGROUP
+};
+
+/* Called with RTNL lock or RCU read lock. */
+static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
+ u32 pid, u32 seq, u32 flags, u8 cmd)
+{
+ struct ovs_header *ovs_header;
+ struct ovs_vport_stats vport_stats;
+ int err;
+
+ ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family,
+ flags, cmd);
+ if (!ovs_header)
+ return -EMSGSIZE;
+
+ ovs_header->dp_ifindex = get_dpifindex(vport->dp);
+
+ NLA_PUT_U32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no);
+ NLA_PUT_U32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type);
+ NLA_PUT_STRING(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport));
+ NLA_PUT_U32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid);
+
+ ovs_vport_get_stats(vport, &vport_stats);
+ NLA_PUT(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
+ &vport_stats);
+
+ err = ovs_vport_get_options(vport, skb);
+ if (err == -EMSGSIZE)
+ goto error;
+
+ return genlmsg_end(skb, ovs_header);
+
+nla_put_failure:
+ err = -EMSGSIZE;
+error:
+ genlmsg_cancel(skb, ovs_header);
+ return err;
+}
+
+/* Called with RTNL lock or RCU read lock. */
+struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid,
+ u32 seq, u8 cmd)
+{
+ struct sk_buff *skb;
+ int retval;
+
+ skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
+ if (!skb)
+ return ERR_PTR(-ENOMEM);
+
+ retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd);
+ if (retval < 0) {
+ kfree_skb(skb);
+ return ERR_PTR(retval);
+ }
+ return skb;
+}
+
+/* Called with RTNL lock or RCU read lock. */
+static struct vport *lookup_vport(struct ovs_header *ovs_header,
+ struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
+{
+ struct datapath *dp;
+ struct vport *vport;
+
+ if (a[OVS_VPORT_ATTR_NAME]) {
+ vport = ovs_vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME]));
+ if (!vport)
+ return ERR_PTR(-ENODEV);
+ return vport;
+ } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
+ u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
+
+ if (port_no >= DP_MAX_PORTS)
+ return ERR_PTR(-EFBIG);
+
+ dp = get_dp(ovs_header->dp_ifindex);
+ if (!dp)
+ return ERR_PTR(-ENODEV);
+
+ vport = rcu_dereference_rtnl(dp->ports[port_no]);
+ if (!vport)
+ return ERR_PTR(-ENOENT);
+ return vport;
+ } else
+ return ERR_PTR(-EINVAL);
+}
+
+static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr **a = info->attrs;
+ struct ovs_header *ovs_header = info->userhdr;
+ struct vport_parms parms;
+ struct sk_buff *reply;
+ struct vport *vport;
+ struct datapath *dp;
+ u32 port_no;
+ int err;
+
+ err = -EINVAL;
+ if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
+ !a[OVS_VPORT_ATTR_UPCALL_PID])
+ goto exit;
+
+ rtnl_lock();
+ dp = get_dp(ovs_header->dp_ifindex);
+ err = -ENODEV;
+ if (!dp)
+ goto exit_unlock;
+
+ if (a[OVS_VPORT_ATTR_PORT_NO]) {
+ port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
+
+ err = -EFBIG;
+ if (port_no >= DP_MAX_PORTS)
+ goto exit_unlock;
+
+ vport = rtnl_dereference(dp->ports[port_no]);
+ err = -EBUSY;
+ if (vport)
+ goto exit_unlock;
+ } else {
+ for (port_no = 1; ; port_no++) {
+ if (port_no >= DP_MAX_PORTS) {
+ err = -EFBIG;
+ goto exit_unlock;
+ }
+ vport = rtnl_dereference(dp->ports[port_no]);
+ if (!vport)
+ break;
+ }
+ }
+
+ parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
+ parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
+ parms.options = a[OVS_VPORT_ATTR_OPTIONS];
+ parms.dp = dp;
+ parms.port_no = port_no;
+ parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
+
+ vport = new_vport(&parms);
+ err = PTR_ERR(vport);
+ if (IS_ERR(vport))
+ goto exit_unlock;
+
+ reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
+ OVS_VPORT_CMD_NEW);
+ if (IS_ERR(reply)) {
+ err = PTR_ERR(reply);
+ ovs_dp_detach_port(vport);
+ goto exit_unlock;
+ }
+ genl_notify(reply, genl_info_net(info), info->snd_pid,
+ ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
+
+exit_unlock:
+ rtnl_unlock();
+exit:
+ return err;
+}
+
+static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr **a = info->attrs;
+ struct sk_buff *reply;
+ struct vport *vport;
+ int err;
+
+ rtnl_lock();
+ vport = lookup_vport(info->userhdr, a);
+ err = PTR_ERR(vport);
+ if (IS_ERR(vport))
+ goto exit_unlock;
+
+ err = 0;
+ if (a[OVS_VPORT_ATTR_TYPE] &&
+ nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
+ err = -EINVAL;
+
+ if (!err && a[OVS_VPORT_ATTR_OPTIONS])
+ err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
+ if (!err && a[OVS_VPORT_ATTR_UPCALL_PID])
+ vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
+
+ reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
+ OVS_VPORT_CMD_NEW);
+ if (IS_ERR(reply)) {
+ err = PTR_ERR(reply);
+ netlink_set_err(init_net.genl_sock, 0,
+ ovs_dp_vport_multicast_group.id, err);
+ return 0;
+ }
+
+ genl_notify(reply, genl_info_net(info), info->snd_pid,
+ ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
+
+exit_unlock:
+ rtnl_unlock();
+ return err;
+}
+
+static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr **a = info->attrs;
+ struct sk_buff *reply;
+ struct vport *vport;
+ int err;
+
+ rtnl_lock();
+ vport = lookup_vport(info->userhdr, a);
+ err = PTR_ERR(vport);
+ if (IS_ERR(vport))
+ goto exit_unlock;
+
+ if (vport->port_no == OVSP_LOCAL) {
+ err = -EINVAL;
+ goto exit_unlock;
+ }
+
+ reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
+ OVS_VPORT_CMD_DEL);
+ err = PTR_ERR(reply);
+ if (IS_ERR(reply))
+ goto exit_unlock;
+
+ ovs_dp_detach_port(vport);
+
+ genl_notify(reply, genl_info_net(info), info->snd_pid,
+ ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
+
+exit_unlock:
+ rtnl_unlock();
+ return err;
+}
+
+static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr **a = info->attrs;
+ struct ovs_header *ovs_header = info->userhdr;
+ struct sk_buff *reply;
+ struct vport *vport;
+ int err;
+
+ rcu_read_lock();
+ vport = lookup_vport(ovs_header, a);
+ err = PTR_ERR(vport);
+ if (IS_ERR(vport))
+ goto exit_unlock;
+
+ reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
+ OVS_VPORT_CMD_NEW);
+ err = PTR_ERR(reply);
+ if (IS_ERR(reply))
+ goto exit_unlock;
+
+ rcu_read_unlock();
+
+ return genlmsg_reply(reply, info);
+
+exit_unlock:
+ rcu_read_unlock();
+ return err;
+}
+
+static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
+ struct datapath *dp;
+ u32 port_no;
+ int retval;
+
+ dp = get_dp(ovs_header->dp_ifindex);
+ if (!dp)
+ return -ENODEV;
+
+ rcu_read_lock();
+ for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) {
+ struct vport *vport;
+
+ vport = rcu_dereference(dp->ports[port_no]);
+ if (!vport)
+ continue;
+
+ if (ovs_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ OVS_VPORT_CMD_NEW) < 0)
+ break;
+ }
+ rcu_read_unlock();
+
+ cb->args[0] = port_no;
+ retval = skb->len;
+
+ return retval;
+}
+
+static void rehash_flow_table(struct work_struct *work)
+{
+ struct datapath *dp;
+
+ genl_lock();
+
+ list_for_each_entry(dp, &dps, list_node) {
+ struct flow_table *old_table = genl_dereference(dp->table);
+ struct flow_table *new_table;
+
+ new_table = ovs_flow_tbl_rehash(old_table);
+ if (!IS_ERR(new_table)) {
+ rcu_assign_pointer(dp->table, new_table);
+ ovs_flow_tbl_deferred_destroy(old_table);
+ }
+ }
+
+ genl_unlock();
+
+ schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
+}
+
+static struct genl_ops dp_vport_genl_ops[] = {
+ { .cmd = OVS_VPORT_CMD_NEW,
+ .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .policy = vport_policy,
+ .doit = ovs_vport_cmd_new
+ },
+ { .cmd = OVS_VPORT_CMD_DEL,
+ .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .policy = vport_policy,
+ .doit = ovs_vport_cmd_del
+ },
+ { .cmd = OVS_VPORT_CMD_GET,
+ .flags = 0, /* OK for unprivileged users. */
+ .policy = vport_policy,
+ .doit = ovs_vport_cmd_get,
+ .dumpit = ovs_vport_cmd_dump
+ },
+ { .cmd = OVS_VPORT_CMD_SET,
+ .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .policy = vport_policy,
+ .doit = ovs_vport_cmd_set,
+ },
+};
+
+struct genl_family_and_ops {
+ struct genl_family *family;
+ struct genl_ops *ops;
+ int n_ops;
+ struct genl_multicast_group *group;
+};
+
+static const struct genl_family_and_ops dp_genl_families[] = {
+ { &dp_datapath_genl_family,
+ dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
+ &ovs_dp_datapath_multicast_group },
+ { &dp_vport_genl_family,
+ dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
+ &ovs_dp_vport_multicast_group },
+ { &dp_flow_genl_family,
+ dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
+ &ovs_dp_flow_multicast_group },
+ { &dp_packet_genl_family,
+ dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
+ NULL },
+};
+
+static void dp_unregister_genl(int n_families)
+{
+ int i;
+
+ for (i = 0; i < n_families; i++)
+ genl_unregister_family(dp_genl_families[i].family);
+}
+
+static int dp_register_genl(void)
+{
+ int n_registered;
+ int err;
+ int i;
+
+ n_registered = 0;
+ for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
+ const struct genl_family_and_ops *f = &dp_genl_families[i];
+
+ err = genl_register_family_with_ops(f->family, f->ops,
+ f->n_ops);
+ if (err)
+ goto error;
+ n_registered++;
+
+ if (f->group) {
+ err = genl_register_mc_group(f->family, f->group);
+ if (err)
+ goto error;
+ }
+ }
+
+ return 0;
+
+error:
+ dp_unregister_genl(n_registered);
+ return err;
+}
+
+static int __init dp_init(void)
+{
+ struct sk_buff *dummy_skb;
+ int err;
+
+ BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
+
+ pr_info("Open vSwitch switching datapath\n");
+
+ err = ovs_flow_init();
+ if (err)
+ goto error;
+
+ err = ovs_vport_init();
+ if (err)
+ goto error_flow_exit;
+
+ err = register_netdevice_notifier(&ovs_dp_device_notifier);
+ if (err)
+ goto error_vport_exit;
+
+ err = dp_register_genl();
+ if (err < 0)
+ goto error_unreg_notifier;
+
+ schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
+
+ return 0;
+
+error_unreg_notifier:
+ unregister_netdevice_notifier(&ovs_dp_device_notifier);
+error_vport_exit:
+ ovs_vport_exit();
+error_flow_exit:
+ ovs_flow_exit();
+error:
+ return err;
+}
+
+static void dp_cleanup(void)
+{
+ cancel_delayed_work_sync(&rehash_flow_wq);
+ rcu_barrier();
+ dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
+ unregister_netdevice_notifier(&ovs_dp_device_notifier);
+ ovs_vport_exit();
+ ovs_flow_exit();
+}
+
+module_init(dp_init);
+module_exit(dp_cleanup);
+
+MODULE_DESCRIPTION("Open vSwitch switching datapath");
+MODULE_LICENSE("GPL");