2 * Copyright (c) 2007-2012 Nicira, Inc.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/if_arp.h>
24 #include <linux/if_vlan.h>
27 #include <linux/jhash.h>
28 #include <linux/delay.h>
29 #include <linux/time.h>
30 #include <linux/etherdevice.h>
31 #include <linux/genetlink.h>
32 #include <linux/kernel.h>
33 #include <linux/kthread.h>
34 #include <linux/mutex.h>
35 #include <linux/percpu.h>
36 #include <linux/rcupdate.h>
37 #include <linux/tcp.h>
38 #include <linux/udp.h>
39 #include <linux/version.h>
40 #include <linux/ethtool.h>
41 #include <linux/wait.h>
42 #include <asm/div64.h>
43 #include <linux/highmem.h>
44 #include <linux/netfilter_bridge.h>
45 #include <linux/netfilter_ipv4.h>
46 #include <linux/inetdevice.h>
47 #include <linux/list.h>
48 #include <linux/openvswitch.h>
49 #include <linux/rculist.h>
50 #include <linux/dmi.h>
51 #include <net/genetlink.h>
52 #include <net/net_namespace.h>
53 #include <net/netns/generic.h>
58 #include "genl_exec.h"
61 #include "vport-internal_dev.h"
63 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18) || \
64 LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0)
65 #error Kernels before 2.6.18 or after 3.5 are not supported by this version of Open vSwitch.
68 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
69 static void rehash_flow_table(struct work_struct *work);
70 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
72 int ovs_net_id __read_mostly;
74 int (*ovs_dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
75 EXPORT_SYMBOL(ovs_dp_ioctl_hook);
80 * Writes to device state (add/remove datapath, port, set operations on vports,
81 * etc.) are protected by RTNL.
83 * Writes to other state (flow table modifications, set miscellaneous datapath
84 * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside
87 * Reads are protected by RCU.
89 * There are a few special cases (mostly stats) that have their own
90 * synchronization but they nest under all of above and don't interact with
94 static struct vport *new_vport(const struct vport_parms *);
95 static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
96 const struct dp_upcall_info *);
97 static int queue_userspace_packet(struct net *, int dp_ifindex,
99 const struct dp_upcall_info *);
101 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
102 static struct datapath *get_dp(struct net *net, int dp_ifindex)
104 struct datapath *dp = NULL;
105 struct net_device *dev;
108 dev = dev_get_by_index_rcu(net, dp_ifindex);
110 struct vport *vport = ovs_internal_dev_get_vport(dev);
119 /* Must be called with rcu_read_lock or RTNL lock. */
120 const char *ovs_dp_name(const struct datapath *dp)
122 struct vport *vport = ovs_vport_rtnl_rcu(dp, OVSP_LOCAL);
123 return vport->ops->get_name(vport);
126 static int get_dpifindex(struct datapath *dp)
133 local = ovs_vport_rcu(dp, OVSP_LOCAL);
135 ifindex = local->ops->get_ifindex(local);
144 static size_t br_nlmsg_size(void)
146 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
147 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
148 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
149 + nla_total_size(4) /* IFLA_MASTER */
150 + nla_total_size(4) /* IFLA_MTU */
151 + nla_total_size(1); /* IFLA_OPERSTATE */
154 /* Caller must hold RTNL lock. */
155 static int dp_fill_ifinfo(struct sk_buff *skb,
156 const struct vport *port,
157 int event, unsigned int flags)
159 struct datapath *dp = port->dp;
160 struct ifinfomsg *hdr;
161 struct nlmsghdr *nlh;
163 if (!port->ops->get_ifindex)
166 nlh = nlmsg_put(skb, 0, 0, event, sizeof(*hdr), flags);
170 hdr = nlmsg_data(nlh);
171 hdr->ifi_family = AF_BRIDGE;
173 hdr->ifi_type = ARPHRD_ETHER;
174 hdr->ifi_index = port->ops->get_ifindex(port);
175 hdr->ifi_flags = port->ops->get_dev_flags(port);
178 if (nla_put_string(skb, IFLA_IFNAME, port->ops->get_name(port)) ||
179 nla_put_u32(skb, IFLA_MASTER, get_dpifindex(dp)) ||
180 nla_put_u32(skb, IFLA_MTU, port->ops->get_mtu(port)) ||
181 #ifdef IFLA_OPERSTATE
182 nla_put_u8(skb, IFLA_OPERSTATE,
183 port->ops->is_running(port) ?
184 port->ops->get_operstate(port) :
187 nla_put(skb, IFLA_ADDRESS, ETH_ALEN, port->ops->get_addr(port)))
188 goto nla_put_failure;
190 return nlmsg_end(skb, nlh);
193 nlmsg_cancel(skb, nlh);
197 /* Caller must hold RTNL lock. */
198 static void dp_ifinfo_notify(int event, struct vport *port)
203 skb = nlmsg_new(br_nlmsg_size(), GFP_KERNEL);
209 err = dp_fill_ifinfo(skb, port, event, 0);
211 if (err == -ENODEV) {
214 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
215 WARN_ON(err == -EMSGSIZE);
220 rtnl_notify(skb, ovs_dp_get_net(port->dp), 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
224 rtnl_set_sk_err(ovs_dp_get_net(port->dp), RTNLGRP_LINK, err);
229 static void release_dp(struct kobject *kobj)
231 struct datapath *dp = container_of(kobj, struct datapath, ifobj);
235 static struct kobj_type dp_ktype = {
236 .release = release_dp
239 static void destroy_dp_rcu(struct rcu_head *rcu)
241 struct datapath *dp = container_of(rcu, struct datapath, rcu);
243 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
244 free_percpu(dp->stats_percpu);
245 release_net(ovs_dp_get_net(dp));
247 kobject_put(&dp->ifobj);
250 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
253 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
256 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
259 struct hlist_node *n;
260 struct hlist_head *head;
262 head = vport_hash_bucket(dp, port_no);
263 hlist_for_each_entry_rcu(vport, n, head, dp_hash_node) {
264 if (vport->port_no == port_no)
270 /* Called with RTNL lock and genl_lock. */
271 static struct vport *new_vport(const struct vport_parms *parms)
275 vport = ovs_vport_add(parms);
276 if (!IS_ERR(vport)) {
277 struct datapath *dp = parms->dp;
278 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
280 hlist_add_head_rcu(&vport->dp_hash_node, head);
281 dp_ifinfo_notify(RTM_NEWLINK, vport);
286 /* Called with RTNL lock. */
287 void ovs_dp_detach_port(struct vport *p)
291 if (p->port_no != OVSP_LOCAL)
292 ovs_dp_sysfs_del_if(p);
294 dp_ifinfo_notify(RTM_DELLINK, p);
296 /* First drop references to device. */
297 hlist_del_rcu(&p->dp_hash_node);
299 /* Then destroy it. */
303 /* Must be called with rcu_read_lock. */
304 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
306 struct datapath *dp = p->dp;
307 struct sw_flow *flow;
308 struct dp_stats_percpu *stats;
312 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
314 if (!OVS_CB(skb)->flow) {
315 struct sw_flow_key key;
318 /* Extract flow from 'skb' into 'key'. */
319 error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
320 if (unlikely(error)) {
326 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table),
328 if (unlikely(!flow)) {
329 struct dp_upcall_info upcall;
331 upcall.cmd = OVS_PACKET_CMD_MISS;
333 upcall.userdata = NULL;
334 upcall.pid = p->upcall_pid;
335 ovs_dp_upcall(dp, skb, &upcall);
337 stats_counter = &stats->n_missed;
341 OVS_CB(skb)->flow = flow;
344 stats_counter = &stats->n_hit;
345 ovs_flow_used(OVS_CB(skb)->flow, skb);
346 ovs_execute_actions(dp, skb);
349 /* Update datapath statistics. */
350 u64_stats_update_begin(&stats->sync);
352 u64_stats_update_end(&stats->sync);
355 static struct genl_family dp_packet_genl_family = {
356 .id = GENL_ID_GENERATE,
357 .hdrsize = sizeof(struct ovs_header),
358 .name = OVS_PACKET_FAMILY,
359 .version = OVS_PACKET_VERSION,
360 .maxattr = OVS_PACKET_ATTR_MAX,
364 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
365 const struct dp_upcall_info *upcall_info)
367 struct dp_stats_percpu *stats;
371 if (upcall_info->pid == 0) {
376 dp_ifindex = get_dpifindex(dp);
382 forward_ip_summed(skb, true);
384 if (!skb_is_gso(skb))
385 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
387 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
394 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
396 u64_stats_update_begin(&stats->sync);
398 u64_stats_update_end(&stats->sync);
403 static int queue_gso_packets(struct net *net, int dp_ifindex,
405 const struct dp_upcall_info *upcall_info)
407 unsigned short gso_type = skb_shinfo(skb)->gso_type;
408 struct dp_upcall_info later_info;
409 struct sw_flow_key later_key;
410 struct sk_buff *segs, *nskb;
413 segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
415 return PTR_ERR(segs);
417 /* Queue all of the segments. */
420 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
424 if (skb == segs && gso_type & SKB_GSO_UDP) {
425 /* The initial flow key extracted by ovs_flow_extract()
426 * in this case is for a first fragment, so we need to
427 * properly mark later fragments.
429 later_key = *upcall_info->key;
430 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
432 later_info = *upcall_info;
433 later_info.key = &later_key;
434 upcall_info = &later_info;
436 } while ((skb = skb->next));
438 /* Free all of the segments. */
446 } while ((skb = nskb));
450 static int queue_userspace_packet(struct net *net, int dp_ifindex,
452 const struct dp_upcall_info *upcall_info)
454 struct ovs_header *upcall;
455 struct sk_buff *nskb = NULL;
456 struct sk_buff *user_skb; /* to be queued to userspace */
461 if (vlan_tx_tag_present(skb)) {
462 nskb = skb_clone(skb, GFP_ATOMIC);
466 err = vlan_deaccel_tag(nskb);
473 if (nla_attr_size(skb->len) > USHRT_MAX) {
478 len = sizeof(struct ovs_header);
479 len += nla_total_size(skb->len);
480 len += nla_total_size(FLOW_BUFSIZE);
481 if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
482 len += nla_total_size(8);
484 user_skb = genlmsg_new(len, GFP_ATOMIC);
490 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
491 0, upcall_info->cmd);
492 upcall->dp_ifindex = dp_ifindex;
494 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
495 ovs_flow_to_nlattrs(upcall_info->key, user_skb);
496 nla_nest_end(user_skb, nla);
498 if (upcall_info->userdata)
499 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
500 nla_get_u64(upcall_info->userdata));
502 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
504 skb_copy_and_csum_dev(skb, nla_data(nla));
506 err = genlmsg_unicast(net, user_skb, upcall_info->pid);
513 /* Called with genl_mutex. */
514 static int flush_flows(struct datapath *dp)
516 struct flow_table *old_table;
517 struct flow_table *new_table;
519 old_table = genl_dereference(dp->table);
520 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
524 rcu_assign_pointer(dp->table, new_table);
526 ovs_flow_tbl_deferred_destroy(old_table);
530 static int validate_actions(const struct nlattr *attr,
531 const struct sw_flow_key *key, int depth);
533 static int validate_sample(const struct nlattr *attr,
534 const struct sw_flow_key *key, int depth)
536 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
537 const struct nlattr *probability, *actions;
538 const struct nlattr *a;
541 memset(attrs, 0, sizeof(attrs));
542 nla_for_each_nested(a, attr, rem) {
543 int type = nla_type(a);
544 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
551 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
552 if (!probability || nla_len(probability) != sizeof(u32))
555 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
556 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
558 return validate_actions(actions, key, depth + 1);
561 static int validate_tp_port(const struct sw_flow_key *flow_key)
563 if (flow_key->eth.type == htons(ETH_P_IP)) {
564 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
566 } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
567 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
574 static int validate_set(const struct nlattr *a,
575 const struct sw_flow_key *flow_key)
577 const struct nlattr *ovs_key = nla_data(a);
578 int key_type = nla_type(ovs_key);
580 /* There can be only one key in a action */
581 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
584 if (key_type > OVS_KEY_ATTR_MAX ||
585 nla_len(ovs_key) != ovs_key_lens[key_type])
589 const struct ovs_key_ipv4 *ipv4_key;
590 const struct ovs_key_ipv4_tunnel *tun_key;
592 case OVS_KEY_ATTR_PRIORITY:
593 case OVS_KEY_ATTR_TUN_ID:
594 case OVS_KEY_ATTR_ETHERNET:
597 case OVS_KEY_ATTR_IPV4_TUNNEL:
598 tun_key = nla_data(ovs_key);
599 if (!tun_key->ipv4_dst)
603 case OVS_KEY_ATTR_IPV4:
604 if (flow_key->eth.type != htons(ETH_P_IP))
607 if (!flow_key->ip.proto)
610 ipv4_key = nla_data(ovs_key);
611 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
614 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
619 case OVS_KEY_ATTR_TCP:
620 if (flow_key->ip.proto != IPPROTO_TCP)
623 return validate_tp_port(flow_key);
625 case OVS_KEY_ATTR_UDP:
626 if (flow_key->ip.proto != IPPROTO_UDP)
629 return validate_tp_port(flow_key);
638 static int validate_userspace(const struct nlattr *attr)
640 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
641 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
642 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
644 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
647 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
648 attr, userspace_policy);
652 if (!a[OVS_USERSPACE_ATTR_PID] ||
653 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
659 static int validate_actions(const struct nlattr *attr,
660 const struct sw_flow_key *key, int depth)
662 const struct nlattr *a;
665 if (depth >= SAMPLE_ACTION_DEPTH)
668 nla_for_each_nested(a, attr, rem) {
669 /* Expected argument lengths, (u32)-1 for variable length. */
670 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
671 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
672 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
673 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
674 [OVS_ACTION_ATTR_POP_VLAN] = 0,
675 [OVS_ACTION_ATTR_SET] = (u32)-1,
676 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
678 const struct ovs_action_push_vlan *vlan;
679 int type = nla_type(a);
681 if (type > OVS_ACTION_ATTR_MAX ||
682 (action_lens[type] != nla_len(a) &&
683 action_lens[type] != (u32)-1))
687 case OVS_ACTION_ATTR_UNSPEC:
690 case OVS_ACTION_ATTR_USERSPACE:
691 err = validate_userspace(a);
696 case OVS_ACTION_ATTR_OUTPUT:
697 if (nla_get_u32(a) >= DP_MAX_PORTS)
702 case OVS_ACTION_ATTR_POP_VLAN:
705 case OVS_ACTION_ATTR_PUSH_VLAN:
707 if (vlan->vlan_tpid != htons(ETH_P_8021Q))
709 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
713 case OVS_ACTION_ATTR_SET:
714 err = validate_set(a, key);
719 case OVS_ACTION_ATTR_SAMPLE:
720 err = validate_sample(a, key, depth);
736 static void clear_stats(struct sw_flow *flow)
740 flow->packet_count = 0;
741 flow->byte_count = 0;
744 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
746 struct ovs_header *ovs_header = info->userhdr;
747 struct nlattr **a = info->attrs;
748 struct sw_flow_actions *acts;
749 struct sk_buff *packet;
750 struct sw_flow *flow;
758 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
759 !a[OVS_PACKET_ATTR_ACTIONS] ||
760 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
763 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
764 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
768 skb_reserve(packet, NET_IP_ALIGN);
770 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
772 skb_reset_mac_header(packet);
773 eth = eth_hdr(packet);
775 /* Normally, setting the skb 'protocol' field would be handled by a
776 * call to eth_type_trans(), but it assumes there's a sending
777 * device, which we may not have. */
778 if (ntohs(eth->h_proto) >= 1536)
779 packet->protocol = eth->h_proto;
781 packet->protocol = htons(ETH_P_802_2);
783 /* Build an sw_flow for sending this packet. */
784 flow = ovs_flow_alloc();
789 err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
793 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
794 &flow->key.phy.in_port,
795 &flow->key.tun.tun_key,
796 a[OVS_PACKET_ATTR_KEY]);
800 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
804 flow->hash = ovs_flow_hash(&flow->key, key_len);
806 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
810 rcu_assign_pointer(flow->sf_acts, acts);
812 OVS_CB(packet)->flow = flow;
813 packet->priority = flow->key.phy.priority;
816 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
822 err = ovs_execute_actions(dp, packet);
839 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
840 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
841 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
842 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
845 static struct genl_ops dp_packet_genl_ops[] = {
846 { .cmd = OVS_PACKET_CMD_EXECUTE,
847 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
848 .policy = packet_policy,
849 .doit = ovs_packet_cmd_execute
853 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
856 struct flow_table *table = genl_dereference(dp->table);
858 stats->n_flows = ovs_flow_tbl_count(table);
860 stats->n_hit = stats->n_missed = stats->n_lost = 0;
861 for_each_possible_cpu(i) {
862 const struct dp_stats_percpu *percpu_stats;
863 struct dp_stats_percpu local_stats;
866 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
869 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
870 local_stats = *percpu_stats;
871 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
873 stats->n_hit += local_stats.n_hit;
874 stats->n_missed += local_stats.n_missed;
875 stats->n_lost += local_stats.n_lost;
879 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
880 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
881 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
882 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
885 static struct genl_family dp_flow_genl_family = {
886 .id = GENL_ID_GENERATE,
887 .hdrsize = sizeof(struct ovs_header),
888 .name = OVS_FLOW_FAMILY,
889 .version = OVS_FLOW_VERSION,
890 .maxattr = OVS_FLOW_ATTR_MAX,
894 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
895 .name = OVS_FLOW_MCGROUP
898 /* Called with genl_lock. */
899 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
900 struct sk_buff *skb, u32 pid,
901 u32 seq, u32 flags, u8 cmd)
903 const int skb_orig_len = skb->len;
904 const struct sw_flow_actions *sf_acts;
905 struct ovs_flow_stats stats;
906 struct ovs_header *ovs_header;
912 sf_acts = rcu_dereference_protected(flow->sf_acts,
913 lockdep_genl_is_held());
915 ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd);
919 ovs_header->dp_ifindex = get_dpifindex(dp);
921 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
923 goto nla_put_failure;
924 err = ovs_flow_to_nlattrs(&flow->key, skb);
927 nla_nest_end(skb, nla);
929 spin_lock_bh(&flow->lock);
931 stats.n_packets = flow->packet_count;
932 stats.n_bytes = flow->byte_count;
933 tcp_flags = flow->tcp_flags;
934 spin_unlock_bh(&flow->lock);
937 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
938 goto nla_put_failure;
940 if (stats.n_packets &&
941 nla_put(skb, OVS_FLOW_ATTR_STATS,
942 sizeof(struct ovs_flow_stats), &stats))
943 goto nla_put_failure;
946 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
947 goto nla_put_failure;
949 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
950 * this is the first flow to be dumped into 'skb'. This is unusual for
951 * Netlink but individual action lists can be longer than
952 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
953 * The userspace caller can always fetch the actions separately if it
954 * really wants them. (Most userspace callers in fact don't care.)
956 * This can only fail for dump operations because the skb is always
957 * properly sized for single flows.
959 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
961 if (err < 0 && skb_orig_len)
964 return genlmsg_end(skb, ovs_header);
969 genlmsg_cancel(skb, ovs_header);
973 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
975 const struct sw_flow_actions *sf_acts;
978 sf_acts = rcu_dereference_protected(flow->sf_acts,
979 lockdep_genl_is_held());
981 /* OVS_FLOW_ATTR_KEY */
982 len = nla_total_size(FLOW_BUFSIZE);
983 /* OVS_FLOW_ATTR_ACTIONS */
984 len += nla_total_size(sf_acts->actions_len);
985 /* OVS_FLOW_ATTR_STATS */
986 len += nla_total_size(sizeof(struct ovs_flow_stats));
987 /* OVS_FLOW_ATTR_TCP_FLAGS */
988 len += nla_total_size(1);
989 /* OVS_FLOW_ATTR_USED */
990 len += nla_total_size(8);
992 len += NLMSG_ALIGN(sizeof(struct ovs_header));
994 return genlmsg_new(len, GFP_KERNEL);
997 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
999 u32 pid, u32 seq, u8 cmd)
1001 struct sk_buff *skb;
1004 skb = ovs_flow_cmd_alloc_info(flow);
1006 return ERR_PTR(-ENOMEM);
1008 retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd);
1013 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
1015 struct nlattr **a = info->attrs;
1016 struct ovs_header *ovs_header = info->userhdr;
1017 struct sw_flow_key key;
1018 struct sw_flow *flow;
1019 struct sk_buff *reply;
1020 struct datapath *dp;
1021 struct flow_table *table;
1027 if (!a[OVS_FLOW_ATTR_KEY])
1029 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1033 /* Validate actions. */
1034 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1035 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0);
1038 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
1043 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1048 table = genl_dereference(dp->table);
1049 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1051 struct sw_flow_actions *acts;
1053 /* Bail out if we're not allowed to create a new flow. */
1055 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
1058 /* Expand table, if necessary, to make room. */
1059 if (ovs_flow_tbl_need_to_expand(table)) {
1060 struct flow_table *new_table;
1062 new_table = ovs_flow_tbl_expand(table);
1063 if (!IS_ERR(new_table)) {
1064 rcu_assign_pointer(dp->table, new_table);
1065 ovs_flow_tbl_deferred_destroy(table);
1066 table = genl_dereference(dp->table);
1070 /* Allocate flow. */
1071 flow = ovs_flow_alloc();
1073 error = PTR_ERR(flow);
1079 /* Obtain actions. */
1080 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
1081 error = PTR_ERR(acts);
1083 goto error_free_flow;
1084 rcu_assign_pointer(flow->sf_acts, acts);
1086 /* Put flow in bucket. */
1087 flow->hash = ovs_flow_hash(&key, key_len);
1088 ovs_flow_tbl_insert(table, flow);
1090 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
1094 /* We found a matching flow. */
1095 struct sw_flow_actions *old_acts;
1096 struct nlattr *acts_attrs;
1098 /* Bail out if we're not allowed to modify an existing flow.
1099 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1100 * because Generic Netlink treats the latter as a dump
1101 * request. We also accept NLM_F_EXCL in case that bug ever
1105 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
1106 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1109 /* Update actions. */
1110 old_acts = rcu_dereference_protected(flow->sf_acts,
1111 lockdep_genl_is_held());
1112 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
1114 (old_acts->actions_len != nla_len(acts_attrs) ||
1115 memcmp(old_acts->actions, nla_data(acts_attrs),
1116 old_acts->actions_len))) {
1117 struct sw_flow_actions *new_acts;
1119 new_acts = ovs_flow_actions_alloc(acts_attrs);
1120 error = PTR_ERR(new_acts);
1121 if (IS_ERR(new_acts))
1124 rcu_assign_pointer(flow->sf_acts, new_acts);
1125 ovs_flow_deferred_free_acts(old_acts);
1128 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
1129 info->snd_seq, OVS_FLOW_CMD_NEW);
1132 if (a[OVS_FLOW_ATTR_CLEAR]) {
1133 spin_lock_bh(&flow->lock);
1135 spin_unlock_bh(&flow->lock);
1140 genl_notify(reply, genl_info_net(info), info->snd_pid,
1141 ovs_dp_flow_multicast_group.id, info->nlhdr,
1144 netlink_set_err(GENL_SOCK(sock_net(skb->sk)), 0,
1145 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1154 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1156 struct nlattr **a = info->attrs;
1157 struct ovs_header *ovs_header = info->userhdr;
1158 struct sw_flow_key key;
1159 struct sk_buff *reply;
1160 struct sw_flow *flow;
1161 struct datapath *dp;
1162 struct flow_table *table;
1166 if (!a[OVS_FLOW_ATTR_KEY])
1168 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1172 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1176 table = genl_dereference(dp->table);
1177 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1181 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
1182 info->snd_seq, OVS_FLOW_CMD_NEW);
1184 return PTR_ERR(reply);
1186 return genlmsg_reply(reply, info);
1189 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1191 struct nlattr **a = info->attrs;
1192 struct ovs_header *ovs_header = info->userhdr;
1193 struct sw_flow_key key;
1194 struct sk_buff *reply;
1195 struct sw_flow *flow;
1196 struct datapath *dp;
1197 struct flow_table *table;
1201 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1205 if (!a[OVS_FLOW_ATTR_KEY])
1206 return flush_flows(dp);
1208 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1212 table = genl_dereference(dp->table);
1213 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1217 reply = ovs_flow_cmd_alloc_info(flow);
1221 ovs_flow_tbl_remove(table, flow);
1223 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid,
1224 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1227 ovs_flow_deferred_free(flow);
1229 genl_notify(reply, genl_info_net(info), info->snd_pid,
1230 ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1234 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1236 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1237 struct datapath *dp;
1238 struct flow_table *table;
1240 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1244 table = genl_dereference(dp->table);
1247 struct sw_flow *flow;
1250 bucket = cb->args[0];
1252 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1256 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1257 NETLINK_CB(cb->skb).pid,
1258 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1259 OVS_FLOW_CMD_NEW) < 0)
1262 cb->args[0] = bucket;
1268 static struct genl_ops dp_flow_genl_ops[] = {
1269 { .cmd = OVS_FLOW_CMD_NEW,
1270 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1271 .policy = flow_policy,
1272 .doit = ovs_flow_cmd_new_or_set
1274 { .cmd = OVS_FLOW_CMD_DEL,
1275 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1276 .policy = flow_policy,
1277 .doit = ovs_flow_cmd_del
1279 { .cmd = OVS_FLOW_CMD_GET,
1280 .flags = 0, /* OK for unprivileged users. */
1281 .policy = flow_policy,
1282 .doit = ovs_flow_cmd_get,
1283 .dumpit = ovs_flow_cmd_dump
1285 { .cmd = OVS_FLOW_CMD_SET,
1286 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1287 .policy = flow_policy,
1288 .doit = ovs_flow_cmd_new_or_set,
1292 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1293 #ifdef HAVE_NLA_NUL_STRING
1294 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1296 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1299 static struct genl_family dp_datapath_genl_family = {
1300 .id = GENL_ID_GENERATE,
1301 .hdrsize = sizeof(struct ovs_header),
1302 .name = OVS_DATAPATH_FAMILY,
1303 .version = OVS_DATAPATH_VERSION,
1304 .maxattr = OVS_DP_ATTR_MAX,
1308 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1309 .name = OVS_DATAPATH_MCGROUP
1312 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1313 u32 pid, u32 seq, u32 flags, u8 cmd)
1315 struct ovs_header *ovs_header;
1316 struct ovs_dp_stats dp_stats;
1319 ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family,
1324 ovs_header->dp_ifindex = get_dpifindex(dp);
1327 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1330 goto nla_put_failure;
1332 get_dp_stats(dp, &dp_stats);
1333 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1334 goto nla_put_failure;
1336 return genlmsg_end(skb, ovs_header);
1339 genlmsg_cancel(skb, ovs_header);
1344 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid,
1347 struct sk_buff *skb;
1350 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1352 return ERR_PTR(-ENOMEM);
1354 retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd);
1357 return ERR_PTR(retval);
1362 static int ovs_dp_cmd_validate(struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1364 return CHECK_NUL_STRING(a[OVS_DP_ATTR_NAME], IFNAMSIZ - 1);
1367 /* Called with genl_mutex and optionally with RTNL lock also. */
1368 static struct datapath *lookup_datapath(struct net *net,
1369 struct ovs_header *ovs_header,
1370 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1372 struct datapath *dp;
1374 if (!a[OVS_DP_ATTR_NAME])
1375 dp = get_dp(net, ovs_header->dp_ifindex);
1377 struct vport *vport;
1380 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1381 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1384 return dp ? dp : ERR_PTR(-ENODEV);
1387 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1389 struct nlattr **a = info->attrs;
1390 struct vport_parms parms;
1391 struct sk_buff *reply;
1392 struct datapath *dp;
1393 struct vport *vport;
1394 struct ovs_net *ovs_net;
1398 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1401 err = ovs_dp_cmd_validate(a);
1408 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1410 goto err_unlock_rtnl;
1412 /* Initialize kobject for bridge. This will be added as
1413 * /sys/class/net/<devname>/brif later, if sysfs is enabled. */
1414 dp->ifobj.kset = NULL;
1415 kobject_init(&dp->ifobj, &dp_ktype);
1417 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1419 /* Allocate table. */
1421 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1425 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1426 if (!dp->stats_percpu) {
1428 goto err_destroy_table;
1431 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1435 goto err_destroy_percpu;
1438 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1439 INIT_HLIST_HEAD(&dp->ports[i]);
1441 /* Set up our datapath device. */
1442 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1443 parms.type = OVS_VPORT_TYPE_INTERNAL;
1444 parms.options = NULL;
1446 parms.port_no = OVSP_LOCAL;
1447 parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1449 vport = new_vport(&parms);
1450 if (IS_ERR(vport)) {
1451 err = PTR_ERR(vport);
1455 goto err_destroy_ports_array;
1458 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1459 info->snd_seq, OVS_DP_CMD_NEW);
1460 err = PTR_ERR(reply);
1462 goto err_destroy_local_port;
1464 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1465 list_add_tail(&dp->list_node, &ovs_net->dps);
1466 ovs_dp_sysfs_add_dp(dp);
1470 genl_notify(reply, genl_info_net(info), info->snd_pid,
1471 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1475 err_destroy_local_port:
1476 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1477 err_destroy_ports_array:
1480 free_percpu(dp->stats_percpu);
1482 ovs_flow_tbl_destroy(genl_dereference(dp->table));
1484 release_net(ovs_dp_get_net(dp));
1492 /* Called with genl_mutex. */
1493 static void __dp_destroy(struct datapath *dp)
1499 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1500 struct vport *vport;
1501 struct hlist_node *node, *n;
1503 hlist_for_each_entry_safe(vport, node, n, &dp->ports[i], dp_hash_node)
1504 if (vport->port_no != OVSP_LOCAL)
1505 ovs_dp_detach_port(vport);
1508 ovs_dp_sysfs_del_dp(dp);
1509 list_del(&dp->list_node);
1510 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1512 /* rtnl_unlock() will wait until all the references to devices that
1513 * are pending unregistration have been dropped. We do it here to
1514 * ensure that any internal devices (which contain DP pointers) are
1515 * fully destroyed before freeing the datapath.
1519 call_rcu(&dp->rcu, destroy_dp_rcu);
1522 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1524 struct sk_buff *reply;
1525 struct datapath *dp;
1528 err = ovs_dp_cmd_validate(info->attrs);
1532 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1537 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1538 info->snd_seq, OVS_DP_CMD_DEL);
1539 err = PTR_ERR(reply);
1545 genl_notify(reply, genl_info_net(info), info->snd_pid,
1546 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1552 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1554 struct sk_buff *reply;
1555 struct datapath *dp;
1558 err = ovs_dp_cmd_validate(info->attrs);
1562 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1566 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1567 info->snd_seq, OVS_DP_CMD_NEW);
1568 if (IS_ERR(reply)) {
1569 err = PTR_ERR(reply);
1570 netlink_set_err(GENL_SOCK(sock_net(skb->sk)), 0,
1571 ovs_dp_datapath_multicast_group.id, err);
1575 genl_notify(reply, genl_info_net(info), info->snd_pid,
1576 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1582 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1584 struct sk_buff *reply;
1585 struct datapath *dp;
1588 err = ovs_dp_cmd_validate(info->attrs);
1592 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1596 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1597 info->snd_seq, OVS_DP_CMD_NEW);
1599 return PTR_ERR(reply);
1601 return genlmsg_reply(reply, info);
1604 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1606 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1607 struct datapath *dp;
1608 int skip = cb->args[0];
1611 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1613 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
1614 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1615 OVS_DP_CMD_NEW) < 0)
1625 static struct genl_ops dp_datapath_genl_ops[] = {
1626 { .cmd = OVS_DP_CMD_NEW,
1627 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1628 .policy = datapath_policy,
1629 .doit = ovs_dp_cmd_new
1631 { .cmd = OVS_DP_CMD_DEL,
1632 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1633 .policy = datapath_policy,
1634 .doit = ovs_dp_cmd_del
1636 { .cmd = OVS_DP_CMD_GET,
1637 .flags = 0, /* OK for unprivileged users. */
1638 .policy = datapath_policy,
1639 .doit = ovs_dp_cmd_get,
1640 .dumpit = ovs_dp_cmd_dump
1642 { .cmd = OVS_DP_CMD_SET,
1643 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1644 .policy = datapath_policy,
1645 .doit = ovs_dp_cmd_set,
1649 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1650 #ifdef HAVE_NLA_NUL_STRING
1651 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1652 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1653 [OVS_VPORT_ATTR_ADDRESS] = { .len = ETH_ALEN },
1655 [OVS_VPORT_ATTR_STATS] = { .minlen = sizeof(struct ovs_vport_stats) },
1656 [OVS_VPORT_ATTR_ADDRESS] = { .minlen = ETH_ALEN },
1658 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1659 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1660 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1661 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1664 static struct genl_family dp_vport_genl_family = {
1665 .id = GENL_ID_GENERATE,
1666 .hdrsize = sizeof(struct ovs_header),
1667 .name = OVS_VPORT_FAMILY,
1668 .version = OVS_VPORT_VERSION,
1669 .maxattr = OVS_VPORT_ATTR_MAX,
1673 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1674 .name = OVS_VPORT_MCGROUP
1677 /* Called with RTNL lock or RCU read lock. */
1678 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1679 u32 pid, u32 seq, u32 flags, u8 cmd)
1681 struct ovs_header *ovs_header;
1682 struct ovs_vport_stats vport_stats;
1685 ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family,
1690 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1692 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1693 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1694 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1695 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid))
1696 goto nla_put_failure;
1698 ovs_vport_get_stats(vport, &vport_stats);
1699 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1701 goto nla_put_failure;
1703 if (nla_put(skb, OVS_VPORT_ATTR_ADDRESS, ETH_ALEN,
1704 vport->ops->get_addr(vport)))
1705 goto nla_put_failure;
1707 err = ovs_vport_get_options(vport, skb);
1708 if (err == -EMSGSIZE)
1711 return genlmsg_end(skb, ovs_header);
1716 genlmsg_cancel(skb, ovs_header);
1720 /* Called with RTNL lock or RCU read lock. */
1721 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid,
1724 struct sk_buff *skb;
1727 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1729 return ERR_PTR(-ENOMEM);
1731 retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd);
1734 return ERR_PTR(retval);
1739 static int ovs_vport_cmd_validate(struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1741 return CHECK_NUL_STRING(a[OVS_VPORT_ATTR_NAME], IFNAMSIZ - 1);
1744 /* Called with RTNL lock or RCU read lock. */
1745 static struct vport *lookup_vport(struct net *net,
1746 struct ovs_header *ovs_header,
1747 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1749 struct datapath *dp;
1750 struct vport *vport;
1752 if (a[OVS_VPORT_ATTR_NAME]) {
1753 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1755 return ERR_PTR(-ENODEV);
1756 if (ovs_header->dp_ifindex &&
1757 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1758 return ERR_PTR(-ENODEV);
1760 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1761 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1763 if (port_no >= DP_MAX_PORTS)
1764 return ERR_PTR(-EFBIG);
1766 dp = get_dp(net, ovs_header->dp_ifindex);
1768 return ERR_PTR(-ENODEV);
1770 vport = ovs_vport_rtnl_rcu(dp, port_no);
1772 return ERR_PTR(-ENOENT);
1775 return ERR_PTR(-EINVAL);
1778 /* Called with RTNL lock. */
1779 static int change_vport(struct vport *vport,
1780 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1784 if (a[OVS_VPORT_ATTR_STATS])
1785 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
1787 if (a[OVS_VPORT_ATTR_ADDRESS])
1788 err = ovs_vport_set_addr(vport, nla_data(a[OVS_VPORT_ATTR_ADDRESS]));
1793 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1795 struct nlattr **a = info->attrs;
1796 struct ovs_header *ovs_header = info->userhdr;
1797 struct vport_parms parms;
1798 struct sk_buff *reply;
1799 struct vport *vport;
1800 struct datapath *dp;
1805 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1806 !a[OVS_VPORT_ATTR_UPCALL_PID])
1809 err = ovs_vport_cmd_validate(a);
1814 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1819 if (a[OVS_VPORT_ATTR_PORT_NO]) {
1820 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1823 if (port_no >= DP_MAX_PORTS)
1826 vport = ovs_vport_rtnl(dp, port_no);
1831 for (port_no = 1; ; port_no++) {
1832 if (port_no >= DP_MAX_PORTS) {
1836 vport = ovs_vport_rtnl(dp, port_no);
1842 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1843 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1844 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1846 parms.port_no = port_no;
1847 parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1849 vport = new_vport(&parms);
1850 err = PTR_ERR(vport);
1854 ovs_dp_sysfs_add_if(vport);
1856 err = change_vport(vport, a);
1858 reply = ovs_vport_cmd_build_info(vport, info->snd_pid,
1862 err = PTR_ERR(reply);
1865 ovs_dp_detach_port(vport);
1868 genl_notify(reply, genl_info_net(info), info->snd_pid,
1869 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1877 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1879 struct nlattr **a = info->attrs;
1880 struct sk_buff *reply;
1881 struct vport *vport;
1884 err = ovs_vport_cmd_validate(a);
1889 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1890 err = PTR_ERR(vport);
1895 if (a[OVS_VPORT_ATTR_TYPE] &&
1896 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1899 if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1900 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1902 err = change_vport(vport, a);
1905 if (!err && a[OVS_VPORT_ATTR_UPCALL_PID])
1906 vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1908 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1910 if (IS_ERR(reply)) {
1911 netlink_set_err(GENL_SOCK(sock_net(skb->sk)), 0,
1912 ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
1916 genl_notify(reply, genl_info_net(info), info->snd_pid,
1917 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1925 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1927 struct nlattr **a = info->attrs;
1928 struct sk_buff *reply;
1929 struct vport *vport;
1932 err = ovs_vport_cmd_validate(a);
1937 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1938 err = PTR_ERR(vport);
1942 if (vport->port_no == OVSP_LOCAL) {
1947 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1949 err = PTR_ERR(reply);
1953 ovs_dp_detach_port(vport);
1955 genl_notify(reply, genl_info_net(info), info->snd_pid,
1956 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1964 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1966 struct nlattr **a = info->attrs;
1967 struct ovs_header *ovs_header = info->userhdr;
1968 struct sk_buff *reply;
1969 struct vport *vport;
1972 err = ovs_vport_cmd_validate(a);
1977 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1978 err = PTR_ERR(vport);
1982 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1984 err = PTR_ERR(reply);
1990 return genlmsg_reply(reply, info);
1998 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2000 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2001 struct datapath *dp;
2002 int bucket = cb->args[0], skip = cb->args[1];
2005 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2010 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2011 struct vport *vport;
2012 struct hlist_node *n;
2015 hlist_for_each_entry_rcu(vport, n, &dp->ports[i], dp_hash_node) {
2017 ovs_vport_cmd_fill_info(vport, skb,
2018 NETLINK_CB(cb->skb).pid,
2021 OVS_VPORT_CMD_NEW) < 0)
2037 static struct genl_ops dp_vport_genl_ops[] = {
2038 { .cmd = OVS_VPORT_CMD_NEW,
2039 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2040 .policy = vport_policy,
2041 .doit = ovs_vport_cmd_new
2043 { .cmd = OVS_VPORT_CMD_DEL,
2044 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2045 .policy = vport_policy,
2046 .doit = ovs_vport_cmd_del
2048 { .cmd = OVS_VPORT_CMD_GET,
2049 .flags = 0, /* OK for unprivileged users. */
2050 .policy = vport_policy,
2051 .doit = ovs_vport_cmd_get,
2052 .dumpit = ovs_vport_cmd_dump
2054 { .cmd = OVS_VPORT_CMD_SET,
2055 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2056 .policy = vport_policy,
2057 .doit = ovs_vport_cmd_set,
2061 struct genl_family_and_ops {
2062 struct genl_family *family;
2063 struct genl_ops *ops;
2065 struct genl_multicast_group *group;
2068 static const struct genl_family_and_ops dp_genl_families[] = {
2069 { &dp_datapath_genl_family,
2070 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
2071 &ovs_dp_datapath_multicast_group },
2072 { &dp_vport_genl_family,
2073 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
2074 &ovs_dp_vport_multicast_group },
2075 { &dp_flow_genl_family,
2076 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
2077 &ovs_dp_flow_multicast_group },
2078 { &dp_packet_genl_family,
2079 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
2083 static void dp_unregister_genl(int n_families)
2087 for (i = 0; i < n_families; i++)
2088 genl_unregister_family(dp_genl_families[i].family);
2091 static int dp_register_genl(void)
2098 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2099 const struct genl_family_and_ops *f = &dp_genl_families[i];
2101 err = genl_register_family_with_ops(f->family, f->ops,
2108 err = genl_register_mc_group(f->family, f->group);
2117 dp_unregister_genl(n_registered);
2121 static int __rehash_flow_table(void *dummy)
2123 struct datapath *dp;
2128 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2130 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2131 struct flow_table *old_table = genl_dereference(dp->table);
2132 struct flow_table *new_table;
2134 new_table = ovs_flow_tbl_rehash(old_table);
2135 if (!IS_ERR(new_table)) {
2136 rcu_assign_pointer(dp->table, new_table);
2137 ovs_flow_tbl_deferred_destroy(old_table);
2145 static void rehash_flow_table(struct work_struct *work)
2147 genl_exec(__rehash_flow_table, NULL);
2148 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2151 static int dp_destroy_all(void *data)
2153 struct datapath *dp, *dp_next;
2154 struct ovs_net *ovs_net = data;
2156 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2162 static int __net_init ovs_init_net(struct net *net)
2164 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2166 INIT_LIST_HEAD(&ovs_net->dps);
2170 static void __net_exit ovs_exit_net(struct net *net)
2172 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2174 genl_exec(dp_destroy_all, ovs_net);
2177 static struct pernet_operations ovs_net_ops = {
2178 .init = ovs_init_net,
2179 .exit = ovs_exit_net,
2181 .size = sizeof(struct ovs_net),
2184 static int __init dp_init(void)
2186 struct sk_buff *dummy_skb;
2189 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
2191 pr_info("Open vSwitch switching datapath %s, built "__DATE__" "__TIME__"\n",
2194 err = genl_exec_init();
2198 err = ovs_workqueues_init();
2200 goto error_genl_exec;
2202 err = ovs_tnl_init();
2206 err = ovs_flow_init();
2208 goto error_tnl_exit;
2210 err = ovs_vport_init();
2212 goto error_flow_exit;
2214 err = register_pernet_device(&ovs_net_ops);
2216 goto error_vport_exit;
2218 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2220 goto error_netns_exit;
2222 err = dp_register_genl();
2224 goto error_unreg_notifier;
2226 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2230 error_unreg_notifier:
2231 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2233 unregister_pernet_device(&ovs_net_ops);
2241 ovs_workqueues_exit();
2248 static void dp_cleanup(void)
2250 cancel_delayed_work_sync(&rehash_flow_wq);
2251 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2252 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2253 unregister_pernet_device(&ovs_net_ops);
2258 ovs_workqueues_exit();
2262 module_init(dp_init);
2263 module_exit(dp_cleanup);
2265 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2266 MODULE_LICENSE("GPL");
2267 MODULE_VERSION(VERSION);