2 * Copyright (c) 2007-2012 Nicira Networks.
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/ethtool.h>
40 #include <linux/wait.h>
41 #include <asm/div64.h>
42 #include <linux/highmem.h>
43 #include <linux/netfilter_bridge.h>
44 #include <linux/netfilter_ipv4.h>
45 #include <linux/inetdevice.h>
46 #include <linux/list.h>
47 #include <linux/openvswitch.h>
48 #include <linux/rculist.h>
49 #include <linux/dmi.h>
50 #include <linux/workqueue.h>
51 #include <net/genetlink.h>
55 #include "vport-internal_dev.h"
60 * Writes to device state (add/remove datapath, port, set operations on vports,
61 * etc.) are protected by RTNL.
63 * Writes to other state (flow table modifications, set miscellaneous datapath
64 * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside
67 * Reads are protected by RCU.
69 * There are a few special cases (mostly stats) that have their own
70 * synchronization but they nest under all of above and don't interact with
74 /* Global list of datapaths to enable dumping them all out.
75 * Protected by genl_mutex.
77 static LIST_HEAD(dps);
79 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
80 static void rehash_flow_table(struct work_struct *work);
81 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
83 static struct vport *new_vport(const struct vport_parms *);
84 static int queue_gso_packets(int dp_ifindex, struct sk_buff *,
85 const struct dp_upcall_info *);
86 static int queue_userspace_packet(int dp_ifindex, struct sk_buff *,
87 const struct dp_upcall_info *);
89 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
90 static struct datapath *get_dp(int dp_ifindex)
92 struct datapath *dp = NULL;
93 struct net_device *dev;
96 dev = dev_get_by_index_rcu(&init_net, dp_ifindex);
98 struct vport *vport = ovs_internal_dev_get_vport(dev);
107 /* Must be called with rcu_read_lock or RTNL lock. */
108 const char *ovs_dp_name(const struct datapath *dp)
110 struct vport *vport = rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]);
111 return vport->ops->get_name(vport);
114 static int get_dpifindex(struct datapath *dp)
121 local = rcu_dereference(dp->ports[OVSP_LOCAL]);
123 ifindex = local->ops->get_ifindex(local);
132 static void destroy_dp_rcu(struct rcu_head *rcu)
134 struct datapath *dp = container_of(rcu, struct datapath, rcu);
136 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
137 free_percpu(dp->stats_percpu);
141 /* Called with RTNL lock and genl_lock. */
142 static struct vport *new_vport(const struct vport_parms *parms)
146 vport = ovs_vport_add(parms);
147 if (!IS_ERR(vport)) {
148 struct datapath *dp = parms->dp;
150 rcu_assign_pointer(dp->ports[parms->port_no], vport);
151 list_add(&vport->node, &dp->port_list);
157 /* Called with RTNL lock. */
158 void ovs_dp_detach_port(struct vport *p)
162 /* First drop references to device. */
164 rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
166 /* Then destroy it. */
170 /* Must be called with rcu_read_lock. */
171 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
173 struct datapath *dp = p->dp;
174 struct sw_flow *flow;
175 struct dp_stats_percpu *stats;
176 struct sw_flow_key key;
181 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
183 /* Extract flow from 'skb' into 'key'. */
184 error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
185 if (unlikely(error)) {
191 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
192 if (unlikely(!flow)) {
193 struct dp_upcall_info upcall;
195 upcall.cmd = OVS_PACKET_CMD_MISS;
197 upcall.userdata = NULL;
198 upcall.pid = p->upcall_pid;
199 ovs_dp_upcall(dp, skb, &upcall);
201 stats_counter = &stats->n_missed;
205 OVS_CB(skb)->flow = flow;
207 stats_counter = &stats->n_hit;
208 ovs_flow_used(OVS_CB(skb)->flow, skb);
209 ovs_execute_actions(dp, skb);
212 /* Update datapath statistics. */
213 u64_stats_update_begin(&stats->sync);
215 u64_stats_update_end(&stats->sync);
218 static struct genl_family dp_packet_genl_family = {
219 .id = GENL_ID_GENERATE,
220 .hdrsize = sizeof(struct ovs_header),
221 .name = OVS_PACKET_FAMILY,
222 .version = OVS_PACKET_VERSION,
223 .maxattr = OVS_PACKET_ATTR_MAX
226 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
227 const struct dp_upcall_info *upcall_info)
229 struct dp_stats_percpu *stats;
233 if (upcall_info->pid == 0) {
238 dp_ifindex = get_dpifindex(dp);
244 if (!skb_is_gso(skb))
245 err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
247 err = queue_gso_packets(dp_ifindex, skb, upcall_info);
254 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
256 u64_stats_update_begin(&stats->sync);
258 u64_stats_update_end(&stats->sync);
263 static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb,
264 const struct dp_upcall_info *upcall_info)
266 struct dp_upcall_info later_info;
267 struct sw_flow_key later_key;
268 struct sk_buff *segs, *nskb;
271 segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
275 /* Queue all of the segments. */
278 err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
282 if (skb == segs && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) {
283 /* The initial flow key extracted by ovs_flow_extract()
284 * in this case is for a first fragment, so we need to
285 * properly mark later fragments.
287 later_key = *upcall_info->key;
288 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
290 later_info = *upcall_info;
291 later_info.key = &later_key;
292 upcall_info = &later_info;
294 } while ((skb = skb->next));
296 /* Free all of the segments. */
304 } while ((skb = nskb));
308 static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb,
309 const struct dp_upcall_info *upcall_info)
311 struct ovs_header *upcall;
312 struct sk_buff *nskb = NULL;
313 struct sk_buff *user_skb; /* to be queued to userspace */
318 if (vlan_tx_tag_present(skb)) {
319 nskb = skb_clone(skb, GFP_ATOMIC);
323 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb));
331 if (nla_attr_size(skb->len) > USHRT_MAX) {
336 len = sizeof(struct ovs_header);
337 len += nla_total_size(skb->len);
338 len += nla_total_size(FLOW_BUFSIZE);
339 if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
340 len += nla_total_size(8);
342 user_skb = genlmsg_new(len, GFP_ATOMIC);
348 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
349 0, upcall_info->cmd);
350 upcall->dp_ifindex = dp_ifindex;
352 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
353 ovs_flow_to_nlattrs(upcall_info->key, user_skb);
354 nla_nest_end(user_skb, nla);
356 if (upcall_info->userdata)
357 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
358 nla_get_u64(upcall_info->userdata));
360 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
362 skb_copy_and_csum_dev(skb, nla_data(nla));
364 err = genlmsg_unicast(&init_net, user_skb, upcall_info->pid);
371 /* Called with genl_mutex. */
372 static int flush_flows(int dp_ifindex)
374 struct flow_table *old_table;
375 struct flow_table *new_table;
378 dp = get_dp(dp_ifindex);
382 old_table = genl_dereference(dp->table);
383 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
387 rcu_assign_pointer(dp->table, new_table);
389 ovs_flow_tbl_deferred_destroy(old_table);
393 static int validate_actions(const struct nlattr *attr,
394 const struct sw_flow_key *key, int depth);
396 static int validate_sample(const struct nlattr *attr,
397 const struct sw_flow_key *key, int depth)
399 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
400 const struct nlattr *probability, *actions;
401 const struct nlattr *a;
404 memset(attrs, 0, sizeof(attrs));
405 nla_for_each_nested(a, attr, rem) {
406 int type = nla_type(a);
407 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
414 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
415 if (!probability || nla_len(probability) != sizeof(u32))
418 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
419 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
421 return validate_actions(actions, key, depth + 1);
424 static int validate_set(const struct nlattr *a,
425 const struct sw_flow_key *flow_key)
427 const struct nlattr *ovs_key = nla_data(a);
428 int key_type = nla_type(ovs_key);
430 /* There can be only one key in a action */
431 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
434 if (key_type > OVS_KEY_ATTR_MAX ||
435 nla_len(ovs_key) != ovs_key_lens[key_type])
439 const struct ovs_key_ipv4 *ipv4_key;
441 case OVS_KEY_ATTR_PRIORITY:
442 case OVS_KEY_ATTR_ETHERNET:
445 case OVS_KEY_ATTR_IPV4:
446 if (flow_key->eth.type != htons(ETH_P_IP))
449 if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst)
452 ipv4_key = nla_data(ovs_key);
453 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
456 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
461 case OVS_KEY_ATTR_TCP:
462 if (flow_key->ip.proto != IPPROTO_TCP)
465 if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst)
470 case OVS_KEY_ATTR_UDP:
471 if (flow_key->ip.proto != IPPROTO_UDP)
474 if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst)
485 static int validate_userspace(const struct nlattr *attr)
487 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
488 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
489 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
491 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
494 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
495 attr, userspace_policy);
499 if (!a[OVS_USERSPACE_ATTR_PID] ||
500 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
506 static int validate_actions(const struct nlattr *attr,
507 const struct sw_flow_key *key, int depth)
509 const struct nlattr *a;
512 if (depth >= SAMPLE_ACTION_DEPTH)
515 nla_for_each_nested(a, attr, rem) {
516 /* Expected argument lengths, (u32)-1 for variable length. */
517 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
518 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
519 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
520 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
521 [OVS_ACTION_ATTR_POP_VLAN] = 0,
522 [OVS_ACTION_ATTR_SET] = (u32)-1,
523 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
525 const struct ovs_action_push_vlan *vlan;
526 int type = nla_type(a);
528 if (type > OVS_ACTION_ATTR_MAX ||
529 (action_lens[type] != nla_len(a) &&
530 action_lens[type] != (u32)-1))
534 case OVS_ACTION_ATTR_UNSPEC:
537 case OVS_ACTION_ATTR_USERSPACE:
538 err = validate_userspace(a);
543 case OVS_ACTION_ATTR_OUTPUT:
544 if (nla_get_u32(a) >= DP_MAX_PORTS)
549 case OVS_ACTION_ATTR_POP_VLAN:
552 case OVS_ACTION_ATTR_PUSH_VLAN:
554 if (vlan->vlan_tpid != htons(ETH_P_8021Q))
556 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
560 case OVS_ACTION_ATTR_SET:
561 err = validate_set(a, key);
566 case OVS_ACTION_ATTR_SAMPLE:
567 err = validate_sample(a, key, depth);
583 static void clear_stats(struct sw_flow *flow)
587 flow->packet_count = 0;
588 flow->byte_count = 0;
591 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
593 struct ovs_header *ovs_header = info->userhdr;
594 struct nlattr **a = info->attrs;
595 struct sw_flow_actions *acts;
596 struct sk_buff *packet;
597 struct sw_flow *flow;
605 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
606 !a[OVS_PACKET_ATTR_ACTIONS] ||
607 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
610 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
611 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
615 skb_reserve(packet, NET_IP_ALIGN);
617 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
619 skb_reset_mac_header(packet);
620 eth = eth_hdr(packet);
622 /* Normally, setting the skb 'protocol' field would be handled by a
623 * call to eth_type_trans(), but it assumes there's a sending
624 * device, which we may not have. */
625 if (ntohs(eth->h_proto) >= 1536)
626 packet->protocol = eth->h_proto;
628 packet->protocol = htons(ETH_P_802_2);
630 /* Build an sw_flow for sending this packet. */
631 flow = ovs_flow_alloc();
636 err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
640 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
641 &flow->key.phy.in_port,
642 a[OVS_PACKET_ATTR_KEY]);
646 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
650 flow->hash = ovs_flow_hash(&flow->key, key_len);
652 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
656 rcu_assign_pointer(flow->sf_acts, acts);
658 OVS_CB(packet)->flow = flow;
659 packet->priority = flow->key.phy.priority;
662 dp = get_dp(ovs_header->dp_ifindex);
668 err = ovs_execute_actions(dp, packet);
685 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
686 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
687 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
688 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
691 static struct genl_ops dp_packet_genl_ops[] = {
692 { .cmd = OVS_PACKET_CMD_EXECUTE,
693 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
694 .policy = packet_policy,
695 .doit = ovs_packet_cmd_execute
699 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
702 struct flow_table *table = genl_dereference(dp->table);
704 stats->n_flows = ovs_flow_tbl_count(table);
706 stats->n_hit = stats->n_missed = stats->n_lost = 0;
707 for_each_possible_cpu(i) {
708 const struct dp_stats_percpu *percpu_stats;
709 struct dp_stats_percpu local_stats;
712 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
715 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
716 local_stats = *percpu_stats;
717 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
719 stats->n_hit += local_stats.n_hit;
720 stats->n_missed += local_stats.n_missed;
721 stats->n_lost += local_stats.n_lost;
725 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
726 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
727 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
728 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
731 static struct genl_family dp_flow_genl_family = {
732 .id = GENL_ID_GENERATE,
733 .hdrsize = sizeof(struct ovs_header),
734 .name = OVS_FLOW_FAMILY,
735 .version = OVS_FLOW_VERSION,
736 .maxattr = OVS_FLOW_ATTR_MAX
739 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
740 .name = OVS_FLOW_MCGROUP
743 /* Called with genl_lock. */
744 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
745 struct sk_buff *skb, u32 pid,
746 u32 seq, u32 flags, u8 cmd)
748 const int skb_orig_len = skb->len;
749 const struct sw_flow_actions *sf_acts;
750 struct ovs_flow_stats stats;
751 struct ovs_header *ovs_header;
757 sf_acts = rcu_dereference_protected(flow->sf_acts,
758 lockdep_genl_is_held());
760 ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd);
764 ovs_header->dp_ifindex = get_dpifindex(dp);
766 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
768 goto nla_put_failure;
769 err = ovs_flow_to_nlattrs(&flow->key, skb);
772 nla_nest_end(skb, nla);
774 spin_lock_bh(&flow->lock);
776 stats.n_packets = flow->packet_count;
777 stats.n_bytes = flow->byte_count;
778 tcp_flags = flow->tcp_flags;
779 spin_unlock_bh(&flow->lock);
782 NLA_PUT_U64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used));
785 NLA_PUT(skb, OVS_FLOW_ATTR_STATS,
786 sizeof(struct ovs_flow_stats), &stats);
789 NLA_PUT_U8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags);
791 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
792 * this is the first flow to be dumped into 'skb'. This is unusual for
793 * Netlink but individual action lists can be longer than
794 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
795 * The userspace caller can always fetch the actions separately if it
796 * really wants them. (Most userspace callers in fact don't care.)
798 * This can only fail for dump operations because the skb is always
799 * properly sized for single flows.
801 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
803 if (err < 0 && skb_orig_len)
806 return genlmsg_end(skb, ovs_header);
811 genlmsg_cancel(skb, ovs_header);
815 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
817 const struct sw_flow_actions *sf_acts;
820 sf_acts = rcu_dereference_protected(flow->sf_acts,
821 lockdep_genl_is_held());
823 /* OVS_FLOW_ATTR_KEY */
824 len = nla_total_size(FLOW_BUFSIZE);
825 /* OVS_FLOW_ATTR_ACTIONS */
826 len += nla_total_size(sf_acts->actions_len);
827 /* OVS_FLOW_ATTR_STATS */
828 len += nla_total_size(sizeof(struct ovs_flow_stats));
829 /* OVS_FLOW_ATTR_TCP_FLAGS */
830 len += nla_total_size(1);
831 /* OVS_FLOW_ATTR_USED */
832 len += nla_total_size(8);
834 len += NLMSG_ALIGN(sizeof(struct ovs_header));
836 return genlmsg_new(len, GFP_KERNEL);
839 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
841 u32 pid, u32 seq, u8 cmd)
846 skb = ovs_flow_cmd_alloc_info(flow);
848 return ERR_PTR(-ENOMEM);
850 retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd);
855 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
857 struct nlattr **a = info->attrs;
858 struct ovs_header *ovs_header = info->userhdr;
859 struct sw_flow_key key;
860 struct sw_flow *flow;
861 struct sk_buff *reply;
863 struct flow_table *table;
869 if (!a[OVS_FLOW_ATTR_KEY])
871 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
875 /* Validate actions. */
876 if (a[OVS_FLOW_ATTR_ACTIONS]) {
877 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0);
880 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
885 dp = get_dp(ovs_header->dp_ifindex);
890 table = genl_dereference(dp->table);
891 flow = ovs_flow_tbl_lookup(table, &key, key_len);
893 struct sw_flow_actions *acts;
895 /* Bail out if we're not allowed to create a new flow. */
897 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
900 /* Expand table, if necessary, to make room. */
901 if (ovs_flow_tbl_need_to_expand(table)) {
902 struct flow_table *new_table;
904 new_table = ovs_flow_tbl_expand(table);
905 if (!IS_ERR(new_table)) {
906 rcu_assign_pointer(dp->table, new_table);
907 ovs_flow_tbl_deferred_destroy(table);
908 table = genl_dereference(dp->table);
913 flow = ovs_flow_alloc();
915 error = PTR_ERR(flow);
921 /* Obtain actions. */
922 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
923 error = PTR_ERR(acts);
925 goto error_free_flow;
926 rcu_assign_pointer(flow->sf_acts, acts);
928 /* Put flow in bucket. */
929 flow->hash = ovs_flow_hash(&key, key_len);
930 ovs_flow_tbl_insert(table, flow);
932 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
936 /* We found a matching flow. */
937 struct sw_flow_actions *old_acts;
938 struct nlattr *acts_attrs;
940 /* Bail out if we're not allowed to modify an existing flow.
941 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
942 * because Generic Netlink treats the latter as a dump
943 * request. We also accept NLM_F_EXCL in case that bug ever
947 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
948 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
951 /* Update actions. */
952 old_acts = rcu_dereference_protected(flow->sf_acts,
953 lockdep_genl_is_held());
954 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
956 (old_acts->actions_len != nla_len(acts_attrs) ||
957 memcmp(old_acts->actions, nla_data(acts_attrs),
958 old_acts->actions_len))) {
959 struct sw_flow_actions *new_acts;
961 new_acts = ovs_flow_actions_alloc(acts_attrs);
962 error = PTR_ERR(new_acts);
963 if (IS_ERR(new_acts))
966 rcu_assign_pointer(flow->sf_acts, new_acts);
967 ovs_flow_deferred_free_acts(old_acts);
970 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
971 info->snd_seq, OVS_FLOW_CMD_NEW);
974 if (a[OVS_FLOW_ATTR_CLEAR]) {
975 spin_lock_bh(&flow->lock);
977 spin_unlock_bh(&flow->lock);
982 genl_notify(reply, genl_info_net(info), info->snd_pid,
983 ovs_dp_flow_multicast_group.id, info->nlhdr,
986 netlink_set_err(init_net.genl_sock, 0,
987 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
996 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
998 struct nlattr **a = info->attrs;
999 struct ovs_header *ovs_header = info->userhdr;
1000 struct sw_flow_key key;
1001 struct sk_buff *reply;
1002 struct sw_flow *flow;
1003 struct datapath *dp;
1004 struct flow_table *table;
1008 if (!a[OVS_FLOW_ATTR_KEY])
1010 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1014 dp = get_dp(ovs_header->dp_ifindex);
1018 table = genl_dereference(dp->table);
1019 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1023 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
1024 info->snd_seq, OVS_FLOW_CMD_NEW);
1026 return PTR_ERR(reply);
1028 return genlmsg_reply(reply, info);
1031 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1033 struct nlattr **a = info->attrs;
1034 struct ovs_header *ovs_header = info->userhdr;
1035 struct sw_flow_key key;
1036 struct sk_buff *reply;
1037 struct sw_flow *flow;
1038 struct datapath *dp;
1039 struct flow_table *table;
1043 if (!a[OVS_FLOW_ATTR_KEY])
1044 return flush_flows(ovs_header->dp_ifindex);
1045 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1049 dp = get_dp(ovs_header->dp_ifindex);
1053 table = genl_dereference(dp->table);
1054 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1058 reply = ovs_flow_cmd_alloc_info(flow);
1062 ovs_flow_tbl_remove(table, flow);
1064 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid,
1065 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1068 ovs_flow_deferred_free(flow);
1070 genl_notify(reply, genl_info_net(info), info->snd_pid,
1071 ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1075 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1077 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1078 struct datapath *dp;
1079 struct flow_table *table;
1081 dp = get_dp(ovs_header->dp_ifindex);
1085 table = genl_dereference(dp->table);
1088 struct sw_flow *flow;
1091 bucket = cb->args[0];
1093 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1097 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1098 NETLINK_CB(cb->skb).pid,
1099 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1100 OVS_FLOW_CMD_NEW) < 0)
1103 cb->args[0] = bucket;
1109 static struct genl_ops dp_flow_genl_ops[] = {
1110 { .cmd = OVS_FLOW_CMD_NEW,
1111 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1112 .policy = flow_policy,
1113 .doit = ovs_flow_cmd_new_or_set
1115 { .cmd = OVS_FLOW_CMD_DEL,
1116 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1117 .policy = flow_policy,
1118 .doit = ovs_flow_cmd_del
1120 { .cmd = OVS_FLOW_CMD_GET,
1121 .flags = 0, /* OK for unprivileged users. */
1122 .policy = flow_policy,
1123 .doit = ovs_flow_cmd_get,
1124 .dumpit = ovs_flow_cmd_dump
1126 { .cmd = OVS_FLOW_CMD_SET,
1127 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1128 .policy = flow_policy,
1129 .doit = ovs_flow_cmd_new_or_set,
1133 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1134 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1135 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1138 static struct genl_family dp_datapath_genl_family = {
1139 .id = GENL_ID_GENERATE,
1140 .hdrsize = sizeof(struct ovs_header),
1141 .name = OVS_DATAPATH_FAMILY,
1142 .version = OVS_DATAPATH_VERSION,
1143 .maxattr = OVS_DP_ATTR_MAX
1146 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1147 .name = OVS_DATAPATH_MCGROUP
1150 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1151 u32 pid, u32 seq, u32 flags, u8 cmd)
1153 struct ovs_header *ovs_header;
1154 struct ovs_dp_stats dp_stats;
1157 ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family,
1162 ovs_header->dp_ifindex = get_dpifindex(dp);
1165 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1168 goto nla_put_failure;
1170 get_dp_stats(dp, &dp_stats);
1171 NLA_PUT(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats);
1173 return genlmsg_end(skb, ovs_header);
1176 genlmsg_cancel(skb, ovs_header);
1181 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid,
1184 struct sk_buff *skb;
1187 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1189 return ERR_PTR(-ENOMEM);
1191 retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd);
1194 return ERR_PTR(retval);
1199 /* Called with genl_mutex and optionally with RTNL lock also. */
1200 static struct datapath *lookup_datapath(struct ovs_header *ovs_header,
1201 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1203 struct datapath *dp;
1205 if (!a[OVS_DP_ATTR_NAME])
1206 dp = get_dp(ovs_header->dp_ifindex);
1208 struct vport *vport;
1211 vport = ovs_vport_locate(nla_data(a[OVS_DP_ATTR_NAME]));
1212 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1215 return dp ? dp : ERR_PTR(-ENODEV);
1218 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1220 struct nlattr **a = info->attrs;
1221 struct vport_parms parms;
1222 struct sk_buff *reply;
1223 struct datapath *dp;
1224 struct vport *vport;
1228 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1233 if (!try_module_get(THIS_MODULE))
1234 goto err_unlock_rtnl;
1237 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1239 goto err_put_module;
1240 INIT_LIST_HEAD(&dp->port_list);
1242 /* Allocate table. */
1244 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1248 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1249 if (!dp->stats_percpu) {
1251 goto err_destroy_table;
1254 /* Set up our datapath device. */
1255 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1256 parms.type = OVS_VPORT_TYPE_INTERNAL;
1257 parms.options = NULL;
1259 parms.port_no = OVSP_LOCAL;
1260 parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1262 vport = new_vport(&parms);
1263 if (IS_ERR(vport)) {
1264 err = PTR_ERR(vport);
1268 goto err_destroy_percpu;
1271 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1272 info->snd_seq, OVS_DP_CMD_NEW);
1273 err = PTR_ERR(reply);
1275 goto err_destroy_local_port;
1277 list_add_tail(&dp->list_node, &dps);
1280 genl_notify(reply, genl_info_net(info), info->snd_pid,
1281 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1285 err_destroy_local_port:
1286 ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
1288 free_percpu(dp->stats_percpu);
1290 ovs_flow_tbl_destroy(genl_dereference(dp->table));
1294 module_put(THIS_MODULE);
1301 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1303 struct vport *vport, *next_vport;
1304 struct sk_buff *reply;
1305 struct datapath *dp;
1309 dp = lookup_datapath(info->userhdr, info->attrs);
1314 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1315 info->snd_seq, OVS_DP_CMD_DEL);
1316 err = PTR_ERR(reply);
1320 list_for_each_entry_safe(vport, next_vport, &dp->port_list, node)
1321 if (vport->port_no != OVSP_LOCAL)
1322 ovs_dp_detach_port(vport);
1324 list_del(&dp->list_node);
1325 ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
1327 /* rtnl_unlock() will wait until all the references to devices that
1328 * are pending unregistration have been dropped. We do it here to
1329 * ensure that any internal devices (which contain DP pointers) are
1330 * fully destroyed before freeing the datapath.
1334 call_rcu(&dp->rcu, destroy_dp_rcu);
1335 module_put(THIS_MODULE);
1337 genl_notify(reply, genl_info_net(info), info->snd_pid,
1338 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1348 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1350 struct sk_buff *reply;
1351 struct datapath *dp;
1354 dp = lookup_datapath(info->userhdr, info->attrs);
1358 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1359 info->snd_seq, OVS_DP_CMD_NEW);
1360 if (IS_ERR(reply)) {
1361 err = PTR_ERR(reply);
1362 netlink_set_err(init_net.genl_sock, 0,
1363 ovs_dp_datapath_multicast_group.id, err);
1367 genl_notify(reply, genl_info_net(info), info->snd_pid,
1368 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1374 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1376 struct sk_buff *reply;
1377 struct datapath *dp;
1379 dp = lookup_datapath(info->userhdr, info->attrs);
1383 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1384 info->snd_seq, OVS_DP_CMD_NEW);
1386 return PTR_ERR(reply);
1388 return genlmsg_reply(reply, info);
1391 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1393 struct datapath *dp;
1394 int skip = cb->args[0];
1397 list_for_each_entry(dp, &dps, list_node) {
1399 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
1400 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1401 OVS_DP_CMD_NEW) < 0)
1411 static struct genl_ops dp_datapath_genl_ops[] = {
1412 { .cmd = OVS_DP_CMD_NEW,
1413 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1414 .policy = datapath_policy,
1415 .doit = ovs_dp_cmd_new
1417 { .cmd = OVS_DP_CMD_DEL,
1418 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1419 .policy = datapath_policy,
1420 .doit = ovs_dp_cmd_del
1422 { .cmd = OVS_DP_CMD_GET,
1423 .flags = 0, /* OK for unprivileged users. */
1424 .policy = datapath_policy,
1425 .doit = ovs_dp_cmd_get,
1426 .dumpit = ovs_dp_cmd_dump
1428 { .cmd = OVS_DP_CMD_SET,
1429 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1430 .policy = datapath_policy,
1431 .doit = ovs_dp_cmd_set,
1435 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1436 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1437 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1438 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1439 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1440 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1441 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1444 static struct genl_family dp_vport_genl_family = {
1445 .id = GENL_ID_GENERATE,
1446 .hdrsize = sizeof(struct ovs_header),
1447 .name = OVS_VPORT_FAMILY,
1448 .version = OVS_VPORT_VERSION,
1449 .maxattr = OVS_VPORT_ATTR_MAX
1452 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1453 .name = OVS_VPORT_MCGROUP
1456 /* Called with RTNL lock or RCU read lock. */
1457 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1458 u32 pid, u32 seq, u32 flags, u8 cmd)
1460 struct ovs_header *ovs_header;
1461 struct ovs_vport_stats vport_stats;
1464 ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family,
1469 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1471 NLA_PUT_U32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no);
1472 NLA_PUT_U32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type);
1473 NLA_PUT_STRING(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport));
1474 NLA_PUT_U32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid);
1476 ovs_vport_get_stats(vport, &vport_stats);
1477 NLA_PUT(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1480 err = ovs_vport_get_options(vport, skb);
1481 if (err == -EMSGSIZE)
1484 return genlmsg_end(skb, ovs_header);
1489 genlmsg_cancel(skb, ovs_header);
1493 /* Called with RTNL lock or RCU read lock. */
1494 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid,
1497 struct sk_buff *skb;
1500 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1502 return ERR_PTR(-ENOMEM);
1504 retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd);
1507 return ERR_PTR(retval);
1512 /* Called with RTNL lock or RCU read lock. */
1513 static struct vport *lookup_vport(struct ovs_header *ovs_header,
1514 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1516 struct datapath *dp;
1517 struct vport *vport;
1519 if (a[OVS_VPORT_ATTR_NAME]) {
1520 vport = ovs_vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME]));
1522 return ERR_PTR(-ENODEV);
1523 if (ovs_header->dp_ifindex &&
1524 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1525 return ERR_PTR(-ENODEV);
1527 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1528 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1530 if (port_no >= DP_MAX_PORTS)
1531 return ERR_PTR(-EFBIG);
1533 dp = get_dp(ovs_header->dp_ifindex);
1535 return ERR_PTR(-ENODEV);
1537 vport = rcu_dereference_rtnl(dp->ports[port_no]);
1539 return ERR_PTR(-ENOENT);
1542 return ERR_PTR(-EINVAL);
1545 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1547 struct nlattr **a = info->attrs;
1548 struct ovs_header *ovs_header = info->userhdr;
1549 struct vport_parms parms;
1550 struct sk_buff *reply;
1551 struct vport *vport;
1552 struct datapath *dp;
1557 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1558 !a[OVS_VPORT_ATTR_UPCALL_PID])
1562 dp = get_dp(ovs_header->dp_ifindex);
1567 if (a[OVS_VPORT_ATTR_PORT_NO]) {
1568 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1571 if (port_no >= DP_MAX_PORTS)
1574 vport = rtnl_dereference(dp->ports[port_no]);
1579 for (port_no = 1; ; port_no++) {
1580 if (port_no >= DP_MAX_PORTS) {
1584 vport = rtnl_dereference(dp->ports[port_no]);
1590 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1591 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1592 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1594 parms.port_no = port_no;
1595 parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1597 vport = new_vport(&parms);
1598 err = PTR_ERR(vport);
1602 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1604 if (IS_ERR(reply)) {
1605 err = PTR_ERR(reply);
1606 ovs_dp_detach_port(vport);
1609 genl_notify(reply, genl_info_net(info), info->snd_pid,
1610 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1618 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1620 struct nlattr **a = info->attrs;
1621 struct sk_buff *reply;
1622 struct vport *vport;
1626 vport = lookup_vport(info->userhdr, a);
1627 err = PTR_ERR(vport);
1632 if (a[OVS_VPORT_ATTR_TYPE] &&
1633 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1636 if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1637 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1638 if (!err && a[OVS_VPORT_ATTR_UPCALL_PID])
1639 vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1641 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1643 if (IS_ERR(reply)) {
1644 netlink_set_err(init_net.genl_sock, 0,
1645 ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
1649 genl_notify(reply, genl_info_net(info), info->snd_pid,
1650 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1657 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1659 struct nlattr **a = info->attrs;
1660 struct sk_buff *reply;
1661 struct vport *vport;
1665 vport = lookup_vport(info->userhdr, a);
1666 err = PTR_ERR(vport);
1670 if (vport->port_no == OVSP_LOCAL) {
1675 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1677 err = PTR_ERR(reply);
1681 ovs_dp_detach_port(vport);
1683 genl_notify(reply, genl_info_net(info), info->snd_pid,
1684 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1691 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1693 struct nlattr **a = info->attrs;
1694 struct ovs_header *ovs_header = info->userhdr;
1695 struct sk_buff *reply;
1696 struct vport *vport;
1700 vport = lookup_vport(ovs_header, a);
1701 err = PTR_ERR(vport);
1705 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1707 err = PTR_ERR(reply);
1713 return genlmsg_reply(reply, info);
1720 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1722 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1723 struct datapath *dp;
1727 dp = get_dp(ovs_header->dp_ifindex);
1732 for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) {
1733 struct vport *vport;
1735 vport = rcu_dereference(dp->ports[port_no]);
1739 if (ovs_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid,
1740 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1741 OVS_VPORT_CMD_NEW) < 0)
1746 cb->args[0] = port_no;
1752 static void rehash_flow_table(struct work_struct *work)
1754 struct datapath *dp;
1758 list_for_each_entry(dp, &dps, list_node) {
1759 struct flow_table *old_table = genl_dereference(dp->table);
1760 struct flow_table *new_table;
1762 new_table = ovs_flow_tbl_rehash(old_table);
1763 if (!IS_ERR(new_table)) {
1764 rcu_assign_pointer(dp->table, new_table);
1765 ovs_flow_tbl_deferred_destroy(old_table);
1771 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1774 static struct genl_ops dp_vport_genl_ops[] = {
1775 { .cmd = OVS_VPORT_CMD_NEW,
1776 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1777 .policy = vport_policy,
1778 .doit = ovs_vport_cmd_new
1780 { .cmd = OVS_VPORT_CMD_DEL,
1781 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1782 .policy = vport_policy,
1783 .doit = ovs_vport_cmd_del
1785 { .cmd = OVS_VPORT_CMD_GET,
1786 .flags = 0, /* OK for unprivileged users. */
1787 .policy = vport_policy,
1788 .doit = ovs_vport_cmd_get,
1789 .dumpit = ovs_vport_cmd_dump
1791 { .cmd = OVS_VPORT_CMD_SET,
1792 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1793 .policy = vport_policy,
1794 .doit = ovs_vport_cmd_set,
1798 struct genl_family_and_ops {
1799 struct genl_family *family;
1800 struct genl_ops *ops;
1802 struct genl_multicast_group *group;
1805 static const struct genl_family_and_ops dp_genl_families[] = {
1806 { &dp_datapath_genl_family,
1807 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1808 &ovs_dp_datapath_multicast_group },
1809 { &dp_vport_genl_family,
1810 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1811 &ovs_dp_vport_multicast_group },
1812 { &dp_flow_genl_family,
1813 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1814 &ovs_dp_flow_multicast_group },
1815 { &dp_packet_genl_family,
1816 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1820 static void dp_unregister_genl(int n_families)
1824 for (i = 0; i < n_families; i++)
1825 genl_unregister_family(dp_genl_families[i].family);
1828 static int dp_register_genl(void)
1835 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1836 const struct genl_family_and_ops *f = &dp_genl_families[i];
1838 err = genl_register_family_with_ops(f->family, f->ops,
1845 err = genl_register_mc_group(f->family, f->group);
1854 dp_unregister_genl(n_registered);
1858 static int __init dp_init(void)
1860 struct sk_buff *dummy_skb;
1863 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
1865 pr_info("Open vSwitch switching datapath\n");
1867 err = ovs_flow_init();
1871 err = ovs_vport_init();
1873 goto error_flow_exit;
1875 err = register_netdevice_notifier(&ovs_dp_device_notifier);
1877 goto error_vport_exit;
1879 err = dp_register_genl();
1881 goto error_unreg_notifier;
1883 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1887 error_unreg_notifier:
1888 unregister_netdevice_notifier(&ovs_dp_device_notifier);
1897 static void dp_cleanup(void)
1899 cancel_delayed_work_sync(&rehash_flow_wq);
1901 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
1902 unregister_netdevice_notifier(&ovs_dp_device_notifier);
1907 module_init(dp_init);
1908 module_exit(dp_cleanup);
1910 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1911 MODULE_LICENSE("GPL");