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/system.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 <linux/workqueue.h>
52 #include <net/genetlink.h>
56 #include "vport-internal_dev.h"
61 * Writes to device state (add/remove datapath, port, set operations on vports,
62 * etc.) are protected by RTNL.
64 * Writes to other state (flow table modifications, set miscellaneous datapath
65 * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside
68 * Reads are protected by RCU.
70 * There are a few special cases (mostly stats) that have their own
71 * synchronization but they nest under all of above and don't interact with
75 /* Global list of datapaths to enable dumping them all out.
76 * Protected by genl_mutex.
78 static LIST_HEAD(dps);
80 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
81 static void rehash_flow_table(struct work_struct *work);
82 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
84 static struct vport *new_vport(const struct vport_parms *);
85 static int queue_gso_packets(int dp_ifindex, struct sk_buff *,
86 const struct dp_upcall_info *);
87 static int queue_userspace_packet(int dp_ifindex, struct sk_buff *,
88 const struct dp_upcall_info *);
90 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
91 static struct datapath *get_dp(int dp_ifindex)
93 struct datapath *dp = NULL;
94 struct net_device *dev;
97 dev = dev_get_by_index_rcu(&init_net, dp_ifindex);
99 struct vport *vport = ovs_internal_dev_get_vport(dev);
108 /* Must be called with rcu_read_lock or RTNL lock. */
109 const char *ovs_dp_name(const struct datapath *dp)
111 struct vport *vport = rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]);
112 return vport->ops->get_name(vport);
115 static int get_dpifindex(struct datapath *dp)
122 local = rcu_dereference(dp->ports[OVSP_LOCAL]);
124 ifindex = local->ops->get_ifindex(local);
133 static void destroy_dp_rcu(struct rcu_head *rcu)
135 struct datapath *dp = container_of(rcu, struct datapath, rcu);
137 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
138 free_percpu(dp->stats_percpu);
142 /* Called with RTNL lock and genl_lock. */
143 static struct vport *new_vport(const struct vport_parms *parms)
147 vport = ovs_vport_add(parms);
148 if (!IS_ERR(vport)) {
149 struct datapath *dp = parms->dp;
151 rcu_assign_pointer(dp->ports[parms->port_no], vport);
152 list_add(&vport->node, &dp->port_list);
158 /* Called with RTNL lock. */
159 void ovs_dp_detach_port(struct vport *p)
163 /* First drop references to device. */
165 rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
167 /* Then destroy it. */
171 /* Must be called with rcu_read_lock. */
172 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
174 struct datapath *dp = p->dp;
175 struct sw_flow *flow;
176 struct dp_stats_percpu *stats;
177 struct sw_flow_key key;
182 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
184 /* Extract flow from 'skb' into 'key'. */
185 error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
186 if (unlikely(error)) {
192 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
193 if (unlikely(!flow)) {
194 struct dp_upcall_info upcall;
196 upcall.cmd = OVS_PACKET_CMD_MISS;
198 upcall.userdata = NULL;
199 upcall.pid = p->upcall_pid;
200 ovs_dp_upcall(dp, skb, &upcall);
202 stats_counter = &stats->n_missed;
206 OVS_CB(skb)->flow = flow;
208 stats_counter = &stats->n_hit;
209 ovs_flow_used(OVS_CB(skb)->flow, skb);
210 ovs_execute_actions(dp, skb);
213 /* Update datapath statistics. */
214 u64_stats_update_begin(&stats->sync);
216 u64_stats_update_end(&stats->sync);
219 static struct genl_family dp_packet_genl_family = {
220 .id = GENL_ID_GENERATE,
221 .hdrsize = sizeof(struct ovs_header),
222 .name = OVS_PACKET_FAMILY,
223 .version = OVS_PACKET_VERSION,
224 .maxattr = OVS_PACKET_ATTR_MAX
227 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
228 const struct dp_upcall_info *upcall_info)
230 struct dp_stats_percpu *stats;
234 if (upcall_info->pid == 0) {
239 dp_ifindex = get_dpifindex(dp);
245 if (!skb_is_gso(skb))
246 err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
248 err = queue_gso_packets(dp_ifindex, skb, upcall_info);
255 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
257 u64_stats_update_begin(&stats->sync);
259 u64_stats_update_end(&stats->sync);
264 static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb,
265 const struct dp_upcall_info *upcall_info)
267 struct dp_upcall_info later_info;
268 struct sw_flow_key later_key;
269 struct sk_buff *segs, *nskb;
272 segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
276 /* Queue all of the segments. */
279 err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
283 if (skb == segs && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) {
284 /* The initial flow key extracted by ovs_flow_extract()
285 * in this case is for a first fragment, so we need to
286 * properly mark later fragments.
288 later_key = *upcall_info->key;
289 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
291 later_info = *upcall_info;
292 later_info.key = &later_key;
293 upcall_info = &later_info;
295 } while ((skb = skb->next));
297 /* Free all of the segments. */
305 } while ((skb = nskb));
309 static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb,
310 const struct dp_upcall_info *upcall_info)
312 struct ovs_header *upcall;
313 struct sk_buff *nskb = NULL;
314 struct sk_buff *user_skb; /* to be queued to userspace */
319 if (vlan_tx_tag_present(skb)) {
320 nskb = skb_clone(skb, GFP_ATOMIC);
324 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb));
332 if (nla_attr_size(skb->len) > USHRT_MAX) {
337 len = sizeof(struct ovs_header);
338 len += nla_total_size(skb->len);
339 len += nla_total_size(FLOW_BUFSIZE);
340 if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
341 len += nla_total_size(8);
343 user_skb = genlmsg_new(len, GFP_ATOMIC);
349 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
350 0, upcall_info->cmd);
351 upcall->dp_ifindex = dp_ifindex;
353 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
354 ovs_flow_to_nlattrs(upcall_info->key, user_skb);
355 nla_nest_end(user_skb, nla);
357 if (upcall_info->userdata)
358 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
359 nla_get_u64(upcall_info->userdata));
361 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
363 skb_copy_and_csum_dev(skb, nla_data(nla));
365 err = genlmsg_unicast(&init_net, user_skb, upcall_info->pid);
372 /* Called with genl_mutex. */
373 static int flush_flows(int dp_ifindex)
375 struct flow_table *old_table;
376 struct flow_table *new_table;
379 dp = get_dp(dp_ifindex);
383 old_table = genl_dereference(dp->table);
384 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
388 rcu_assign_pointer(dp->table, new_table);
390 ovs_flow_tbl_deferred_destroy(old_table);
394 static int validate_actions(const struct nlattr *attr,
395 const struct sw_flow_key *key, int depth);
397 static int validate_sample(const struct nlattr *attr,
398 const struct sw_flow_key *key, int depth)
400 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
401 const struct nlattr *probability, *actions;
402 const struct nlattr *a;
405 memset(attrs, 0, sizeof(attrs));
406 nla_for_each_nested(a, attr, rem) {
407 int type = nla_type(a);
408 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
415 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
416 if (!probability || nla_len(probability) != sizeof(u32))
419 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
420 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
422 return validate_actions(actions, key, depth + 1);
425 static int validate_set(const struct nlattr *a,
426 const struct sw_flow_key *flow_key)
428 const struct nlattr *ovs_key = nla_data(a);
429 int key_type = nla_type(ovs_key);
431 /* There can be only one key in a action */
432 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
435 if (key_type > OVS_KEY_ATTR_MAX ||
436 nla_len(ovs_key) != ovs_key_lens[key_type])
440 const struct ovs_key_ipv4 *ipv4_key;
442 case OVS_KEY_ATTR_PRIORITY:
443 case OVS_KEY_ATTR_ETHERNET:
446 case OVS_KEY_ATTR_IPV4:
447 if (flow_key->eth.type != htons(ETH_P_IP))
450 if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst)
453 ipv4_key = nla_data(ovs_key);
454 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
457 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
462 case OVS_KEY_ATTR_TCP:
463 if (flow_key->ip.proto != IPPROTO_TCP)
466 if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst)
471 case OVS_KEY_ATTR_UDP:
472 if (flow_key->ip.proto != IPPROTO_UDP)
475 if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst)
486 static int validate_userspace(const struct nlattr *attr)
488 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
489 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
490 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
492 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
495 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
496 attr, userspace_policy);
500 if (!a[OVS_USERSPACE_ATTR_PID] ||
501 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
507 static int validate_actions(const struct nlattr *attr,
508 const struct sw_flow_key *key, int depth)
510 const struct nlattr *a;
513 if (depth >= SAMPLE_ACTION_DEPTH)
516 nla_for_each_nested(a, attr, rem) {
517 /* Expected argument lengths, (u32)-1 for variable length. */
518 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
519 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
520 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
521 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
522 [OVS_ACTION_ATTR_POP_VLAN] = 0,
523 [OVS_ACTION_ATTR_SET] = (u32)-1,
524 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
526 const struct ovs_action_push_vlan *vlan;
527 int type = nla_type(a);
529 if (type > OVS_ACTION_ATTR_MAX ||
530 (action_lens[type] != nla_len(a) &&
531 action_lens[type] != (u32)-1))
535 case OVS_ACTION_ATTR_UNSPEC:
538 case OVS_ACTION_ATTR_USERSPACE:
539 err = validate_userspace(a);
544 case OVS_ACTION_ATTR_OUTPUT:
545 if (nla_get_u32(a) >= DP_MAX_PORTS)
550 case OVS_ACTION_ATTR_POP_VLAN:
553 case OVS_ACTION_ATTR_PUSH_VLAN:
555 if (vlan->vlan_tpid != htons(ETH_P_8021Q))
557 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
561 case OVS_ACTION_ATTR_SET:
562 err = validate_set(a, key);
567 case OVS_ACTION_ATTR_SAMPLE:
568 err = validate_sample(a, key, depth);
584 static void clear_stats(struct sw_flow *flow)
588 flow->packet_count = 0;
589 flow->byte_count = 0;
592 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
594 struct ovs_header *ovs_header = info->userhdr;
595 struct nlattr **a = info->attrs;
596 struct sw_flow_actions *acts;
597 struct sk_buff *packet;
598 struct sw_flow *flow;
606 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
607 !a[OVS_PACKET_ATTR_ACTIONS] ||
608 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
611 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
612 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
616 skb_reserve(packet, NET_IP_ALIGN);
618 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
620 skb_reset_mac_header(packet);
621 eth = eth_hdr(packet);
623 /* Normally, setting the skb 'protocol' field would be handled by a
624 * call to eth_type_trans(), but it assumes there's a sending
625 * device, which we may not have. */
626 if (ntohs(eth->h_proto) >= 1536)
627 packet->protocol = eth->h_proto;
629 packet->protocol = htons(ETH_P_802_2);
631 /* Build an sw_flow for sending this packet. */
632 flow = ovs_flow_alloc();
637 err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
641 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
642 &flow->key.phy.in_port,
643 a[OVS_PACKET_ATTR_KEY]);
647 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
651 flow->hash = ovs_flow_hash(&flow->key, key_len);
653 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
657 rcu_assign_pointer(flow->sf_acts, acts);
659 OVS_CB(packet)->flow = flow;
660 packet->priority = flow->key.phy.priority;
663 dp = get_dp(ovs_header->dp_ifindex);
669 err = ovs_execute_actions(dp, packet);
686 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
687 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
688 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
689 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
692 static struct genl_ops dp_packet_genl_ops[] = {
693 { .cmd = OVS_PACKET_CMD_EXECUTE,
694 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
695 .policy = packet_policy,
696 .doit = ovs_packet_cmd_execute
700 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
703 struct flow_table *table = genl_dereference(dp->table);
705 stats->n_flows = ovs_flow_tbl_count(table);
707 stats->n_hit = stats->n_missed = stats->n_lost = 0;
708 for_each_possible_cpu(i) {
709 const struct dp_stats_percpu *percpu_stats;
710 struct dp_stats_percpu local_stats;
713 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
716 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
717 local_stats = *percpu_stats;
718 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
720 stats->n_hit += local_stats.n_hit;
721 stats->n_missed += local_stats.n_missed;
722 stats->n_lost += local_stats.n_lost;
726 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
727 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
728 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
729 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
732 static struct genl_family dp_flow_genl_family = {
733 .id = GENL_ID_GENERATE,
734 .hdrsize = sizeof(struct ovs_header),
735 .name = OVS_FLOW_FAMILY,
736 .version = OVS_FLOW_VERSION,
737 .maxattr = OVS_FLOW_ATTR_MAX
740 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
741 .name = OVS_FLOW_MCGROUP
744 /* Called with genl_lock. */
745 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
746 struct sk_buff *skb, u32 pid,
747 u32 seq, u32 flags, u8 cmd)
749 const int skb_orig_len = skb->len;
750 const struct sw_flow_actions *sf_acts;
751 struct ovs_flow_stats stats;
752 struct ovs_header *ovs_header;
758 sf_acts = rcu_dereference_protected(flow->sf_acts,
759 lockdep_genl_is_held());
761 ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd);
765 ovs_header->dp_ifindex = get_dpifindex(dp);
767 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
769 goto nla_put_failure;
770 err = ovs_flow_to_nlattrs(&flow->key, skb);
773 nla_nest_end(skb, nla);
775 spin_lock_bh(&flow->lock);
777 stats.n_packets = flow->packet_count;
778 stats.n_bytes = flow->byte_count;
779 tcp_flags = flow->tcp_flags;
780 spin_unlock_bh(&flow->lock);
783 NLA_PUT_U64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used));
786 NLA_PUT(skb, OVS_FLOW_ATTR_STATS,
787 sizeof(struct ovs_flow_stats), &stats);
790 NLA_PUT_U8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags);
792 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
793 * this is the first flow to be dumped into 'skb'. This is unusual for
794 * Netlink but individual action lists can be longer than
795 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
796 * The userspace caller can always fetch the actions separately if it
797 * really wants them. (Most userspace callers in fact don't care.)
799 * This can only fail for dump operations because the skb is always
800 * properly sized for single flows.
802 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
804 if (err < 0 && skb_orig_len)
807 return genlmsg_end(skb, ovs_header);
812 genlmsg_cancel(skb, ovs_header);
816 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
818 const struct sw_flow_actions *sf_acts;
821 sf_acts = rcu_dereference_protected(flow->sf_acts,
822 lockdep_genl_is_held());
824 /* OVS_FLOW_ATTR_KEY */
825 len = nla_total_size(FLOW_BUFSIZE);
826 /* OVS_FLOW_ATTR_ACTIONS */
827 len += nla_total_size(sf_acts->actions_len);
828 /* OVS_FLOW_ATTR_STATS */
829 len += nla_total_size(sizeof(struct ovs_flow_stats));
830 /* OVS_FLOW_ATTR_TCP_FLAGS */
831 len += nla_total_size(1);
832 /* OVS_FLOW_ATTR_USED */
833 len += nla_total_size(8);
835 len += NLMSG_ALIGN(sizeof(struct ovs_header));
837 return genlmsg_new(len, GFP_KERNEL);
840 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
842 u32 pid, u32 seq, u8 cmd)
847 skb = ovs_flow_cmd_alloc_info(flow);
849 return ERR_PTR(-ENOMEM);
851 retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd);
856 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
858 struct nlattr **a = info->attrs;
859 struct ovs_header *ovs_header = info->userhdr;
860 struct sw_flow_key key;
861 struct sw_flow *flow;
862 struct sk_buff *reply;
864 struct flow_table *table;
870 if (!a[OVS_FLOW_ATTR_KEY])
872 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
876 /* Validate actions. */
877 if (a[OVS_FLOW_ATTR_ACTIONS]) {
878 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0);
881 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
886 dp = get_dp(ovs_header->dp_ifindex);
891 table = genl_dereference(dp->table);
892 flow = ovs_flow_tbl_lookup(table, &key, key_len);
894 struct sw_flow_actions *acts;
896 /* Bail out if we're not allowed to create a new flow. */
898 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
901 /* Expand table, if necessary, to make room. */
902 if (ovs_flow_tbl_need_to_expand(table)) {
903 struct flow_table *new_table;
905 new_table = ovs_flow_tbl_expand(table);
906 if (!IS_ERR(new_table)) {
907 rcu_assign_pointer(dp->table, new_table);
908 ovs_flow_tbl_deferred_destroy(table);
909 table = genl_dereference(dp->table);
914 flow = ovs_flow_alloc();
916 error = PTR_ERR(flow);
922 /* Obtain actions. */
923 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
924 error = PTR_ERR(acts);
926 goto error_free_flow;
927 rcu_assign_pointer(flow->sf_acts, acts);
929 /* Put flow in bucket. */
930 flow->hash = ovs_flow_hash(&key, key_len);
931 ovs_flow_tbl_insert(table, flow);
933 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
937 /* We found a matching flow. */
938 struct sw_flow_actions *old_acts;
939 struct nlattr *acts_attrs;
941 /* Bail out if we're not allowed to modify an existing flow.
942 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
943 * because Generic Netlink treats the latter as a dump
944 * request. We also accept NLM_F_EXCL in case that bug ever
948 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
949 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
952 /* Update actions. */
953 old_acts = rcu_dereference_protected(flow->sf_acts,
954 lockdep_genl_is_held());
955 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
957 (old_acts->actions_len != nla_len(acts_attrs) ||
958 memcmp(old_acts->actions, nla_data(acts_attrs),
959 old_acts->actions_len))) {
960 struct sw_flow_actions *new_acts;
962 new_acts = ovs_flow_actions_alloc(acts_attrs);
963 error = PTR_ERR(new_acts);
964 if (IS_ERR(new_acts))
967 rcu_assign_pointer(flow->sf_acts, new_acts);
968 ovs_flow_deferred_free_acts(old_acts);
971 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
972 info->snd_seq, OVS_FLOW_CMD_NEW);
975 if (a[OVS_FLOW_ATTR_CLEAR]) {
976 spin_lock_bh(&flow->lock);
978 spin_unlock_bh(&flow->lock);
983 genl_notify(reply, genl_info_net(info), info->snd_pid,
984 ovs_dp_flow_multicast_group.id, info->nlhdr,
987 netlink_set_err(init_net.genl_sock, 0,
988 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
997 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
999 struct nlattr **a = info->attrs;
1000 struct ovs_header *ovs_header = info->userhdr;
1001 struct sw_flow_key key;
1002 struct sk_buff *reply;
1003 struct sw_flow *flow;
1004 struct datapath *dp;
1005 struct flow_table *table;
1009 if (!a[OVS_FLOW_ATTR_KEY])
1011 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1015 dp = get_dp(ovs_header->dp_ifindex);
1019 table = genl_dereference(dp->table);
1020 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1024 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
1025 info->snd_seq, OVS_FLOW_CMD_NEW);
1027 return PTR_ERR(reply);
1029 return genlmsg_reply(reply, info);
1032 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1034 struct nlattr **a = info->attrs;
1035 struct ovs_header *ovs_header = info->userhdr;
1036 struct sw_flow_key key;
1037 struct sk_buff *reply;
1038 struct sw_flow *flow;
1039 struct datapath *dp;
1040 struct flow_table *table;
1044 if (!a[OVS_FLOW_ATTR_KEY])
1045 return flush_flows(ovs_header->dp_ifindex);
1046 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1050 dp = get_dp(ovs_header->dp_ifindex);
1054 table = genl_dereference(dp->table);
1055 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1059 reply = ovs_flow_cmd_alloc_info(flow);
1063 ovs_flow_tbl_remove(table, flow);
1065 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid,
1066 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1069 ovs_flow_deferred_free(flow);
1071 genl_notify(reply, genl_info_net(info), info->snd_pid,
1072 ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1076 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1078 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1079 struct datapath *dp;
1080 struct flow_table *table;
1082 dp = get_dp(ovs_header->dp_ifindex);
1086 table = genl_dereference(dp->table);
1089 struct sw_flow *flow;
1092 bucket = cb->args[0];
1094 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1098 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1099 NETLINK_CB(cb->skb).pid,
1100 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1101 OVS_FLOW_CMD_NEW) < 0)
1104 cb->args[0] = bucket;
1110 static struct genl_ops dp_flow_genl_ops[] = {
1111 { .cmd = OVS_FLOW_CMD_NEW,
1112 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1113 .policy = flow_policy,
1114 .doit = ovs_flow_cmd_new_or_set
1116 { .cmd = OVS_FLOW_CMD_DEL,
1117 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1118 .policy = flow_policy,
1119 .doit = ovs_flow_cmd_del
1121 { .cmd = OVS_FLOW_CMD_GET,
1122 .flags = 0, /* OK for unprivileged users. */
1123 .policy = flow_policy,
1124 .doit = ovs_flow_cmd_get,
1125 .dumpit = ovs_flow_cmd_dump
1127 { .cmd = OVS_FLOW_CMD_SET,
1128 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1129 .policy = flow_policy,
1130 .doit = ovs_flow_cmd_new_or_set,
1134 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1135 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1136 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1139 static struct genl_family dp_datapath_genl_family = {
1140 .id = GENL_ID_GENERATE,
1141 .hdrsize = sizeof(struct ovs_header),
1142 .name = OVS_DATAPATH_FAMILY,
1143 .version = OVS_DATAPATH_VERSION,
1144 .maxattr = OVS_DP_ATTR_MAX
1147 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1148 .name = OVS_DATAPATH_MCGROUP
1151 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1152 u32 pid, u32 seq, u32 flags, u8 cmd)
1154 struct ovs_header *ovs_header;
1155 struct ovs_dp_stats dp_stats;
1158 ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family,
1163 ovs_header->dp_ifindex = get_dpifindex(dp);
1166 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1169 goto nla_put_failure;
1171 get_dp_stats(dp, &dp_stats);
1172 NLA_PUT(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats);
1174 return genlmsg_end(skb, ovs_header);
1177 genlmsg_cancel(skb, ovs_header);
1182 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid,
1185 struct sk_buff *skb;
1188 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1190 return ERR_PTR(-ENOMEM);
1192 retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd);
1195 return ERR_PTR(retval);
1200 /* Called with genl_mutex and optionally with RTNL lock also. */
1201 static struct datapath *lookup_datapath(struct ovs_header *ovs_header,
1202 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1204 struct datapath *dp;
1206 if (!a[OVS_DP_ATTR_NAME])
1207 dp = get_dp(ovs_header->dp_ifindex);
1209 struct vport *vport;
1212 vport = ovs_vport_locate(nla_data(a[OVS_DP_ATTR_NAME]));
1213 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1216 return dp ? dp : ERR_PTR(-ENODEV);
1219 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1221 struct nlattr **a = info->attrs;
1222 struct vport_parms parms;
1223 struct sk_buff *reply;
1224 struct datapath *dp;
1225 struct vport *vport;
1229 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1234 if (!try_module_get(THIS_MODULE))
1235 goto err_unlock_rtnl;
1238 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1240 goto err_put_module;
1241 INIT_LIST_HEAD(&dp->port_list);
1243 /* Allocate table. */
1245 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1249 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1250 if (!dp->stats_percpu) {
1252 goto err_destroy_table;
1255 /* Set up our datapath device. */
1256 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1257 parms.type = OVS_VPORT_TYPE_INTERNAL;
1258 parms.options = NULL;
1260 parms.port_no = OVSP_LOCAL;
1261 parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1263 vport = new_vport(&parms);
1264 if (IS_ERR(vport)) {
1265 err = PTR_ERR(vport);
1269 goto err_destroy_percpu;
1272 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1273 info->snd_seq, OVS_DP_CMD_NEW);
1274 err = PTR_ERR(reply);
1276 goto err_destroy_local_port;
1278 list_add_tail(&dp->list_node, &dps);
1281 genl_notify(reply, genl_info_net(info), info->snd_pid,
1282 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1286 err_destroy_local_port:
1287 ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
1289 free_percpu(dp->stats_percpu);
1291 ovs_flow_tbl_destroy(genl_dereference(dp->table));
1295 module_put(THIS_MODULE);
1302 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1304 struct vport *vport, *next_vport;
1305 struct sk_buff *reply;
1306 struct datapath *dp;
1310 dp = lookup_datapath(info->userhdr, info->attrs);
1315 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1316 info->snd_seq, OVS_DP_CMD_DEL);
1317 err = PTR_ERR(reply);
1321 list_for_each_entry_safe(vport, next_vport, &dp->port_list, node)
1322 if (vport->port_no != OVSP_LOCAL)
1323 ovs_dp_detach_port(vport);
1325 list_del(&dp->list_node);
1326 ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
1328 /* rtnl_unlock() will wait until all the references to devices that
1329 * are pending unregistration have been dropped. We do it here to
1330 * ensure that any internal devices (which contain DP pointers) are
1331 * fully destroyed before freeing the datapath.
1335 call_rcu(&dp->rcu, destroy_dp_rcu);
1336 module_put(THIS_MODULE);
1338 genl_notify(reply, genl_info_net(info), info->snd_pid,
1339 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1349 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1351 struct sk_buff *reply;
1352 struct datapath *dp;
1355 dp = lookup_datapath(info->userhdr, info->attrs);
1359 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1360 info->snd_seq, OVS_DP_CMD_NEW);
1361 if (IS_ERR(reply)) {
1362 err = PTR_ERR(reply);
1363 netlink_set_err(init_net.genl_sock, 0,
1364 ovs_dp_datapath_multicast_group.id, err);
1368 genl_notify(reply, genl_info_net(info), info->snd_pid,
1369 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1375 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1377 struct sk_buff *reply;
1378 struct datapath *dp;
1380 dp = lookup_datapath(info->userhdr, info->attrs);
1384 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1385 info->snd_seq, OVS_DP_CMD_NEW);
1387 return PTR_ERR(reply);
1389 return genlmsg_reply(reply, info);
1392 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1394 struct datapath *dp;
1395 int skip = cb->args[0];
1398 list_for_each_entry(dp, &dps, list_node) {
1400 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
1401 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1402 OVS_DP_CMD_NEW) < 0)
1412 static struct genl_ops dp_datapath_genl_ops[] = {
1413 { .cmd = OVS_DP_CMD_NEW,
1414 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1415 .policy = datapath_policy,
1416 .doit = ovs_dp_cmd_new
1418 { .cmd = OVS_DP_CMD_DEL,
1419 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1420 .policy = datapath_policy,
1421 .doit = ovs_dp_cmd_del
1423 { .cmd = OVS_DP_CMD_GET,
1424 .flags = 0, /* OK for unprivileged users. */
1425 .policy = datapath_policy,
1426 .doit = ovs_dp_cmd_get,
1427 .dumpit = ovs_dp_cmd_dump
1429 { .cmd = OVS_DP_CMD_SET,
1430 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1431 .policy = datapath_policy,
1432 .doit = ovs_dp_cmd_set,
1436 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1437 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1438 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1439 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1440 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1441 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1442 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1445 static struct genl_family dp_vport_genl_family = {
1446 .id = GENL_ID_GENERATE,
1447 .hdrsize = sizeof(struct ovs_header),
1448 .name = OVS_VPORT_FAMILY,
1449 .version = OVS_VPORT_VERSION,
1450 .maxattr = OVS_VPORT_ATTR_MAX
1453 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1454 .name = OVS_VPORT_MCGROUP
1457 /* Called with RTNL lock or RCU read lock. */
1458 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1459 u32 pid, u32 seq, u32 flags, u8 cmd)
1461 struct ovs_header *ovs_header;
1462 struct ovs_vport_stats vport_stats;
1465 ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family,
1470 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1472 NLA_PUT_U32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no);
1473 NLA_PUT_U32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type);
1474 NLA_PUT_STRING(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport));
1475 NLA_PUT_U32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid);
1477 ovs_vport_get_stats(vport, &vport_stats);
1478 NLA_PUT(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1481 err = ovs_vport_get_options(vport, skb);
1482 if (err == -EMSGSIZE)
1485 return genlmsg_end(skb, ovs_header);
1490 genlmsg_cancel(skb, ovs_header);
1494 /* Called with RTNL lock or RCU read lock. */
1495 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid,
1498 struct sk_buff *skb;
1501 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1503 return ERR_PTR(-ENOMEM);
1505 retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd);
1508 return ERR_PTR(retval);
1513 /* Called with RTNL lock or RCU read lock. */
1514 static struct vport *lookup_vport(struct ovs_header *ovs_header,
1515 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1517 struct datapath *dp;
1518 struct vport *vport;
1520 if (a[OVS_VPORT_ATTR_NAME]) {
1521 vport = ovs_vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME]));
1523 return ERR_PTR(-ENODEV);
1525 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1526 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1528 if (port_no >= DP_MAX_PORTS)
1529 return ERR_PTR(-EFBIG);
1531 dp = get_dp(ovs_header->dp_ifindex);
1533 return ERR_PTR(-ENODEV);
1535 vport = rcu_dereference_rtnl(dp->ports[port_no]);
1537 return ERR_PTR(-ENOENT);
1540 return ERR_PTR(-EINVAL);
1543 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1545 struct nlattr **a = info->attrs;
1546 struct ovs_header *ovs_header = info->userhdr;
1547 struct vport_parms parms;
1548 struct sk_buff *reply;
1549 struct vport *vport;
1550 struct datapath *dp;
1555 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1556 !a[OVS_VPORT_ATTR_UPCALL_PID])
1560 dp = get_dp(ovs_header->dp_ifindex);
1565 if (a[OVS_VPORT_ATTR_PORT_NO]) {
1566 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1569 if (port_no >= DP_MAX_PORTS)
1572 vport = rtnl_dereference(dp->ports[port_no]);
1577 for (port_no = 1; ; port_no++) {
1578 if (port_no >= DP_MAX_PORTS) {
1582 vport = rtnl_dereference(dp->ports[port_no]);
1588 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1589 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1590 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1592 parms.port_no = port_no;
1593 parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1595 vport = new_vport(&parms);
1596 err = PTR_ERR(vport);
1600 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1602 if (IS_ERR(reply)) {
1603 err = PTR_ERR(reply);
1604 ovs_dp_detach_port(vport);
1607 genl_notify(reply, genl_info_net(info), info->snd_pid,
1608 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1616 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1618 struct nlattr **a = info->attrs;
1619 struct sk_buff *reply;
1620 struct vport *vport;
1624 vport = lookup_vport(info->userhdr, a);
1625 err = PTR_ERR(vport);
1630 if (a[OVS_VPORT_ATTR_TYPE] &&
1631 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1634 if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1635 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1636 if (!err && a[OVS_VPORT_ATTR_UPCALL_PID])
1637 vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1639 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1641 if (IS_ERR(reply)) {
1642 err = PTR_ERR(reply);
1643 netlink_set_err(init_net.genl_sock, 0,
1644 ovs_dp_vport_multicast_group.id, err);
1648 genl_notify(reply, genl_info_net(info), info->snd_pid,
1649 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1656 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1658 struct nlattr **a = info->attrs;
1659 struct sk_buff *reply;
1660 struct vport *vport;
1664 vport = lookup_vport(info->userhdr, a);
1665 err = PTR_ERR(vport);
1669 if (vport->port_no == OVSP_LOCAL) {
1674 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1676 err = PTR_ERR(reply);
1680 ovs_dp_detach_port(vport);
1682 genl_notify(reply, genl_info_net(info), info->snd_pid,
1683 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1690 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1692 struct nlattr **a = info->attrs;
1693 struct ovs_header *ovs_header = info->userhdr;
1694 struct sk_buff *reply;
1695 struct vport *vport;
1699 vport = lookup_vport(ovs_header, a);
1700 err = PTR_ERR(vport);
1704 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1706 err = PTR_ERR(reply);
1712 return genlmsg_reply(reply, info);
1719 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1721 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1722 struct datapath *dp;
1726 dp = get_dp(ovs_header->dp_ifindex);
1731 for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) {
1732 struct vport *vport;
1734 vport = rcu_dereference(dp->ports[port_no]);
1738 if (ovs_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid,
1739 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1740 OVS_VPORT_CMD_NEW) < 0)
1745 cb->args[0] = port_no;
1751 static void rehash_flow_table(struct work_struct *work)
1753 struct datapath *dp;
1757 list_for_each_entry(dp, &dps, list_node) {
1758 struct flow_table *old_table = genl_dereference(dp->table);
1759 struct flow_table *new_table;
1761 new_table = ovs_flow_tbl_rehash(old_table);
1762 if (!IS_ERR(new_table)) {
1763 rcu_assign_pointer(dp->table, new_table);
1764 ovs_flow_tbl_deferred_destroy(old_table);
1770 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1773 static struct genl_ops dp_vport_genl_ops[] = {
1774 { .cmd = OVS_VPORT_CMD_NEW,
1775 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1776 .policy = vport_policy,
1777 .doit = ovs_vport_cmd_new
1779 { .cmd = OVS_VPORT_CMD_DEL,
1780 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1781 .policy = vport_policy,
1782 .doit = ovs_vport_cmd_del
1784 { .cmd = OVS_VPORT_CMD_GET,
1785 .flags = 0, /* OK for unprivileged users. */
1786 .policy = vport_policy,
1787 .doit = ovs_vport_cmd_get,
1788 .dumpit = ovs_vport_cmd_dump
1790 { .cmd = OVS_VPORT_CMD_SET,
1791 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1792 .policy = vport_policy,
1793 .doit = ovs_vport_cmd_set,
1797 struct genl_family_and_ops {
1798 struct genl_family *family;
1799 struct genl_ops *ops;
1801 struct genl_multicast_group *group;
1804 static const struct genl_family_and_ops dp_genl_families[] = {
1805 { &dp_datapath_genl_family,
1806 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1807 &ovs_dp_datapath_multicast_group },
1808 { &dp_vport_genl_family,
1809 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1810 &ovs_dp_vport_multicast_group },
1811 { &dp_flow_genl_family,
1812 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1813 &ovs_dp_flow_multicast_group },
1814 { &dp_packet_genl_family,
1815 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1819 static void dp_unregister_genl(int n_families)
1823 for (i = 0; i < n_families; i++)
1824 genl_unregister_family(dp_genl_families[i].family);
1827 static int dp_register_genl(void)
1834 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1835 const struct genl_family_and_ops *f = &dp_genl_families[i];
1837 err = genl_register_family_with_ops(f->family, f->ops,
1844 err = genl_register_mc_group(f->family, f->group);
1853 dp_unregister_genl(n_registered);
1857 static int __init dp_init(void)
1859 struct sk_buff *dummy_skb;
1862 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
1864 pr_info("Open vSwitch switching datapath\n");
1866 err = ovs_flow_init();
1870 err = ovs_vport_init();
1872 goto error_flow_exit;
1874 err = register_netdevice_notifier(&ovs_dp_device_notifier);
1876 goto error_vport_exit;
1878 err = dp_register_genl();
1880 goto error_unreg_notifier;
1882 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1886 error_unreg_notifier:
1887 unregister_netdevice_notifier(&ovs_dp_device_notifier);
1896 static void dp_cleanup(void)
1898 cancel_delayed_work_sync(&rehash_flow_wq);
1900 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
1901 unregister_netdevice_notifier(&ovs_dp_device_notifier);
1906 module_init(dp_init);
1907 module_exit(dp_cleanup);
1909 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1910 MODULE_LICENSE("GPL");