2 * Copyright (c) 2007-2013 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 <linux/genetlink.h>
52 #include <net/genetlink.h>
53 #include <net/genetlink.h>
54 #include <net/net_namespace.h>
55 #include <net/netns/generic.h>
60 #include "vport-internal_dev.h"
61 #include "vport-netdev.h"
63 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
64 static void rehash_flow_table(struct work_struct *work);
65 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
67 int ovs_net_id __read_mostly;
69 static void ovs_notify(struct sk_buff *skb, struct genl_info *info,
70 struct genl_multicast_group *grp)
72 genl_notify(skb, genl_info_net(info), info->snd_portid,
73 grp->id, info->nlhdr, GFP_KERNEL);
79 * All writes e.g. Writes to device state (add/remove datapath, port, set
80 * operations on vports, etc.), Writes to other state (flow table
81 * modifications, set miscellaneous datapath parameters, etc.) are protected
84 * Reads are protected by RCU.
86 * There are a few special cases (mostly stats) that have their own
87 * synchronization but they nest under all of above and don't interact with
90 * The RTNL lock nests inside ovs_mutex.
93 static DEFINE_MUTEX(ovs_mutex);
97 mutex_lock(&ovs_mutex);
100 void ovs_unlock(void)
102 mutex_unlock(&ovs_mutex);
105 #ifdef CONFIG_LOCKDEP
106 int lockdep_ovsl_is_held(void)
109 return lockdep_is_held(&ovs_mutex);
115 static struct vport *new_vport(const struct vport_parms *);
116 static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
117 const struct dp_upcall_info *);
118 static int queue_userspace_packet(struct net *, int dp_ifindex,
120 const struct dp_upcall_info *);
122 /* Must be called with rcu_read_lock or ovs_mutex. */
123 static struct datapath *get_dp(struct net *net, int dp_ifindex)
125 struct datapath *dp = NULL;
126 struct net_device *dev;
129 dev = dev_get_by_index_rcu(net, dp_ifindex);
131 struct vport *vport = ovs_internal_dev_get_vport(dev);
140 /* Must be called with rcu_read_lock or ovs_mutex. */
141 const char *ovs_dp_name(const struct datapath *dp)
143 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
144 return vport->ops->get_name(vport);
147 static int get_dpifindex(struct datapath *dp)
154 local = ovs_vport_rcu(dp, OVSP_LOCAL);
156 ifindex = netdev_vport_priv(local)->dev->ifindex;
165 static void destroy_dp_rcu(struct rcu_head *rcu)
167 struct datapath *dp = container_of(rcu, struct datapath, rcu);
169 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table, false);
170 free_percpu(dp->stats_percpu);
171 release_net(ovs_dp_get_net(dp));
176 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
179 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
182 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
185 struct hlist_head *head;
187 head = vport_hash_bucket(dp, port_no);
188 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
189 if (vport->port_no == port_no)
195 /* Called with ovs_mutex. */
196 static struct vport *new_vport(const struct vport_parms *parms)
200 vport = ovs_vport_add(parms);
201 if (!IS_ERR(vport)) {
202 struct datapath *dp = parms->dp;
203 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
205 hlist_add_head_rcu(&vport->dp_hash_node, head);
210 void ovs_dp_detach_port(struct vport *p)
214 /* First drop references to device. */
215 hlist_del_rcu(&p->dp_hash_node);
217 /* Then destroy it. */
221 /* Must be called with rcu_read_lock. */
222 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
224 struct datapath *dp = p->dp;
225 struct sw_flow *flow;
226 struct dp_stats_percpu *stats;
227 struct sw_flow_key key;
231 stats = this_cpu_ptr(dp->stats_percpu);
233 /* Extract flow from 'skb' into 'key'. */
234 error = ovs_flow_extract(skb, p->port_no, &key);
235 if (unlikely(error)) {
241 flow = ovs_flow_lookup(rcu_dereference(dp->table), &key);
242 if (unlikely(!flow)) {
243 struct dp_upcall_info upcall;
245 upcall.cmd = OVS_PACKET_CMD_MISS;
247 upcall.userdata = NULL;
248 upcall.portid = p->upcall_portid;
249 ovs_dp_upcall(dp, skb, &upcall);
251 stats_counter = &stats->n_missed;
255 OVS_CB(skb)->flow = flow;
256 OVS_CB(skb)->pkt_key = &key;
258 stats_counter = &stats->n_hit;
259 ovs_flow_used(OVS_CB(skb)->flow, skb);
260 ovs_execute_actions(dp, skb);
263 /* Update datapath statistics. */
264 u64_stats_update_begin(&stats->sync);
266 u64_stats_update_end(&stats->sync);
269 static struct genl_family dp_packet_genl_family = {
270 .id = GENL_ID_GENERATE,
271 .hdrsize = sizeof(struct ovs_header),
272 .name = OVS_PACKET_FAMILY,
273 .version = OVS_PACKET_VERSION,
274 .maxattr = OVS_PACKET_ATTR_MAX,
279 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
280 const struct dp_upcall_info *upcall_info)
282 struct dp_stats_percpu *stats;
286 if (upcall_info->portid == 0) {
291 dp_ifindex = get_dpifindex(dp);
297 if (!skb_is_gso(skb))
298 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
300 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
307 stats = this_cpu_ptr(dp->stats_percpu);
309 u64_stats_update_begin(&stats->sync);
311 u64_stats_update_end(&stats->sync);
316 static int queue_gso_packets(struct net *net, int dp_ifindex,
318 const struct dp_upcall_info *upcall_info)
320 unsigned short gso_type = skb_shinfo(skb)->gso_type;
321 struct dp_upcall_info later_info;
322 struct sw_flow_key later_key;
323 struct sk_buff *segs, *nskb;
326 segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
328 return PTR_ERR(segs);
330 /* Queue all of the segments. */
333 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
337 if (skb == segs && gso_type & SKB_GSO_UDP) {
338 /* The initial flow key extracted by ovs_flow_extract()
339 * in this case is for a first fragment, so we need to
340 * properly mark later fragments.
342 later_key = *upcall_info->key;
343 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
345 later_info = *upcall_info;
346 later_info.key = &later_key;
347 upcall_info = &later_info;
349 } while ((skb = skb->next));
351 /* Free all of the segments. */
359 } while ((skb = nskb));
363 static size_t key_attr_size(void)
365 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
366 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */
367 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */
368 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
369 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
370 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */
371 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */
372 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
373 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */
374 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */
375 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */
376 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
377 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
378 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */
379 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */
380 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
381 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
382 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
383 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
386 static size_t upcall_msg_size(const struct sk_buff *skb,
387 const struct nlattr *userdata)
389 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
390 + nla_total_size(skb->len) /* OVS_PACKET_ATTR_PACKET */
391 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
393 /* OVS_PACKET_ATTR_USERDATA */
395 size += NLA_ALIGN(userdata->nla_len);
400 static int queue_userspace_packet(struct net *net, int dp_ifindex,
402 const struct dp_upcall_info *upcall_info)
404 struct ovs_header *upcall;
405 struct sk_buff *nskb = NULL;
406 struct sk_buff *user_skb; /* to be queued to userspace */
410 if (vlan_tx_tag_present(skb)) {
411 nskb = skb_clone(skb, GFP_ATOMIC);
415 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
419 vlan_set_tci(nskb, 0);
424 if (nla_attr_size(skb->len) > USHRT_MAX) {
429 user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC);
435 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
436 0, upcall_info->cmd);
437 upcall->dp_ifindex = dp_ifindex;
439 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
440 ovs_flow_to_nlattrs(upcall_info->key, upcall_info->key, user_skb);
441 nla_nest_end(user_skb, nla);
443 if (upcall_info->userdata)
444 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
445 nla_len(upcall_info->userdata),
446 nla_data(upcall_info->userdata));
448 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
450 skb_copy_and_csum_dev(skb, nla_data(nla));
452 genlmsg_end(user_skb, upcall);
453 err = genlmsg_unicast(net, user_skb, upcall_info->portid);
460 /* Called with ovs_mutex. */
461 static int flush_flows(struct datapath *dp)
463 struct flow_table *old_table;
464 struct flow_table *new_table;
466 old_table = ovsl_dereference(dp->table);
467 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
471 rcu_assign_pointer(dp->table, new_table);
473 ovs_flow_tbl_destroy(old_table, true);
477 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa, int attr_len)
480 struct sw_flow_actions *acts;
482 int req_size = NLA_ALIGN(attr_len);
483 int next_offset = offsetof(struct sw_flow_actions, actions) +
486 if (req_size <= (ksize(*sfa) - next_offset))
489 new_acts_size = ksize(*sfa) * 2;
491 if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
492 if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
493 return ERR_PTR(-EMSGSIZE);
494 new_acts_size = MAX_ACTIONS_BUFSIZE;
497 acts = ovs_flow_actions_alloc(new_acts_size);
501 memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
502 acts->actions_len = (*sfa)->actions_len;
507 (*sfa)->actions_len += req_size;
508 return (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
511 static int add_action(struct sw_flow_actions **sfa, int attrtype, void *data, int len)
515 a = reserve_sfa_size(sfa, nla_attr_size(len));
519 a->nla_type = attrtype;
520 a->nla_len = nla_attr_size(len);
523 memcpy(nla_data(a), data, len);
524 memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
529 static inline int add_nested_action_start(struct sw_flow_actions **sfa, int attrtype)
531 int used = (*sfa)->actions_len;
534 err = add_action(sfa, attrtype, NULL, 0);
541 static inline void add_nested_action_end(struct sw_flow_actions *sfa, int st_offset)
543 struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions + st_offset);
545 a->nla_len = sfa->actions_len - st_offset;
548 static int validate_and_copy_actions(const struct nlattr *attr,
549 const struct sw_flow_key *key, int depth,
550 struct sw_flow_actions **sfa);
552 static int validate_and_copy_sample(const struct nlattr *attr,
553 const struct sw_flow_key *key, int depth,
554 struct sw_flow_actions **sfa)
556 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
557 const struct nlattr *probability, *actions;
558 const struct nlattr *a;
559 int rem, start, err, st_acts;
561 memset(attrs, 0, sizeof(attrs));
562 nla_for_each_nested(a, attr, rem) {
563 int type = nla_type(a);
564 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
571 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
572 if (!probability || nla_len(probability) != sizeof(u32))
575 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
576 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
579 /* validation done, copy sample action. */
580 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE);
583 err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY, nla_data(probability), sizeof(u32));
586 st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS);
590 err = validate_and_copy_actions(actions, key, depth + 1, sfa);
594 add_nested_action_end(*sfa, st_acts);
595 add_nested_action_end(*sfa, start);
600 static int validate_tp_port(const struct sw_flow_key *flow_key)
602 if (flow_key->eth.type == htons(ETH_P_IP)) {
603 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
605 } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
606 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
613 static int validate_and_copy_set_tun(const struct nlattr *attr,
614 struct sw_flow_actions **sfa)
616 struct sw_flow_match match;
617 struct sw_flow_key key;
620 ovs_match_init(&match, &key, NULL);
621 err = ovs_ipv4_tun_from_nlattr(nla_data(attr), &match, false);
625 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET);
629 err = add_action(sfa, OVS_KEY_ATTR_IPV4_TUNNEL, &match.key->tun_key,
630 sizeof(match.key->tun_key));
631 add_nested_action_end(*sfa, start);
636 static int validate_set(const struct nlattr *a,
637 const struct sw_flow_key *flow_key,
638 struct sw_flow_actions **sfa,
641 const struct nlattr *ovs_key = nla_data(a);
642 int key_type = nla_type(ovs_key);
644 /* There can be only one key in a action */
645 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
648 if (key_type > OVS_KEY_ATTR_MAX ||
649 (ovs_key_lens[key_type] != nla_len(ovs_key) &&
650 ovs_key_lens[key_type] != -1))
654 const struct ovs_key_ipv4 *ipv4_key;
655 const struct ovs_key_ipv6 *ipv6_key;
658 case OVS_KEY_ATTR_PRIORITY:
659 case OVS_KEY_ATTR_SKB_MARK:
660 case OVS_KEY_ATTR_ETHERNET:
663 case OVS_KEY_ATTR_TUNNEL:
665 err = validate_and_copy_set_tun(a, sfa);
670 case OVS_KEY_ATTR_IPV4:
671 if (flow_key->eth.type != htons(ETH_P_IP))
674 if (!flow_key->ip.proto)
677 ipv4_key = nla_data(ovs_key);
678 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
681 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
686 case OVS_KEY_ATTR_IPV6:
687 if (flow_key->eth.type != htons(ETH_P_IPV6))
690 if (!flow_key->ip.proto)
693 ipv6_key = nla_data(ovs_key);
694 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
697 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
700 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
705 case OVS_KEY_ATTR_TCP:
706 if (flow_key->ip.proto != IPPROTO_TCP)
709 return validate_tp_port(flow_key);
711 case OVS_KEY_ATTR_UDP:
712 if (flow_key->ip.proto != IPPROTO_UDP)
715 return validate_tp_port(flow_key);
717 case OVS_KEY_ATTR_SCTP:
718 if (flow_key->ip.proto != IPPROTO_SCTP)
721 return validate_tp_port(flow_key);
730 static int validate_userspace(const struct nlattr *attr)
732 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
733 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
734 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
736 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
739 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
740 attr, userspace_policy);
744 if (!a[OVS_USERSPACE_ATTR_PID] ||
745 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
751 static int copy_action(const struct nlattr *from,
752 struct sw_flow_actions **sfa)
754 int totlen = NLA_ALIGN(from->nla_len);
757 to = reserve_sfa_size(sfa, from->nla_len);
761 memcpy(to, from, totlen);
765 static int validate_and_copy_actions(const struct nlattr *attr,
766 const struct sw_flow_key *key,
768 struct sw_flow_actions **sfa)
770 const struct nlattr *a;
773 if (depth >= SAMPLE_ACTION_DEPTH)
776 nla_for_each_nested(a, attr, rem) {
777 /* Expected argument lengths, (u32)-1 for variable length. */
778 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
779 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
780 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
781 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
782 [OVS_ACTION_ATTR_POP_VLAN] = 0,
783 [OVS_ACTION_ATTR_SET] = (u32)-1,
784 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
786 const struct ovs_action_push_vlan *vlan;
787 int type = nla_type(a);
790 if (type > OVS_ACTION_ATTR_MAX ||
791 (action_lens[type] != nla_len(a) &&
792 action_lens[type] != (u32)-1))
797 case OVS_ACTION_ATTR_UNSPEC:
800 case OVS_ACTION_ATTR_USERSPACE:
801 err = validate_userspace(a);
806 case OVS_ACTION_ATTR_OUTPUT:
807 if (nla_get_u32(a) >= DP_MAX_PORTS)
812 case OVS_ACTION_ATTR_POP_VLAN:
815 case OVS_ACTION_ATTR_PUSH_VLAN:
817 if (vlan->vlan_tpid != htons(ETH_P_8021Q))
819 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
823 case OVS_ACTION_ATTR_SET:
824 err = validate_set(a, key, sfa, &skip_copy);
829 case OVS_ACTION_ATTR_SAMPLE:
830 err = validate_and_copy_sample(a, key, depth, sfa);
840 err = copy_action(a, sfa);
852 static void clear_stats(struct sw_flow *flow)
856 flow->packet_count = 0;
857 flow->byte_count = 0;
860 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
862 struct ovs_header *ovs_header = info->userhdr;
863 struct nlattr **a = info->attrs;
864 struct sw_flow_actions *acts;
865 struct sk_buff *packet;
866 struct sw_flow *flow;
873 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
874 !a[OVS_PACKET_ATTR_ACTIONS])
877 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
878 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
882 skb_reserve(packet, NET_IP_ALIGN);
884 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
886 skb_reset_mac_header(packet);
887 eth = eth_hdr(packet);
889 /* Normally, setting the skb 'protocol' field would be handled by a
890 * call to eth_type_trans(), but it assumes there's a sending
891 * device, which we may not have. */
892 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
893 packet->protocol = eth->h_proto;
895 packet->protocol = htons(ETH_P_802_2);
897 /* Build an sw_flow for sending this packet. */
898 flow = ovs_flow_alloc();
903 err = ovs_flow_extract(packet, -1, &flow->key);
907 err = ovs_flow_metadata_from_nlattrs(flow, a[OVS_PACKET_ATTR_KEY]);
910 acts = ovs_flow_actions_alloc(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
915 err = validate_and_copy_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0, &acts);
916 rcu_assign_pointer(flow->sf_acts, acts);
920 OVS_CB(packet)->flow = flow;
921 OVS_CB(packet)->pkt_key = &flow->key;
922 packet->priority = flow->key.phy.priority;
923 packet->mark = flow->key.phy.skb_mark;
926 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
932 err = ovs_execute_actions(dp, packet);
936 ovs_flow_free(flow, false);
942 ovs_flow_free(flow, false);
949 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
950 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
951 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
952 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
955 static struct genl_ops dp_packet_genl_ops[] = {
956 { .cmd = OVS_PACKET_CMD_EXECUTE,
957 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
958 .policy = packet_policy,
959 .doit = ovs_packet_cmd_execute
963 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
965 struct flow_table *table;
968 table = rcu_dereference_check(dp->table, lockdep_ovsl_is_held());
969 stats->n_flows = ovs_flow_tbl_count(table);
971 stats->n_hit = stats->n_missed = stats->n_lost = 0;
972 for_each_possible_cpu(i) {
973 const struct dp_stats_percpu *percpu_stats;
974 struct dp_stats_percpu local_stats;
977 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
980 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
981 local_stats = *percpu_stats;
982 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
984 stats->n_hit += local_stats.n_hit;
985 stats->n_missed += local_stats.n_missed;
986 stats->n_lost += local_stats.n_lost;
990 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
991 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
992 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
993 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
996 static struct genl_family dp_flow_genl_family = {
997 .id = GENL_ID_GENERATE,
998 .hdrsize = sizeof(struct ovs_header),
999 .name = OVS_FLOW_FAMILY,
1000 .version = OVS_FLOW_VERSION,
1001 .maxattr = OVS_FLOW_ATTR_MAX,
1006 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
1007 .name = OVS_FLOW_MCGROUP
1010 static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb);
1011 static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb)
1013 const struct nlattr *a;
1014 struct nlattr *start;
1017 start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
1021 nla_for_each_nested(a, attr, rem) {
1022 int type = nla_type(a);
1023 struct nlattr *st_sample;
1026 case OVS_SAMPLE_ATTR_PROBABILITY:
1027 if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY, sizeof(u32), nla_data(a)))
1030 case OVS_SAMPLE_ATTR_ACTIONS:
1031 st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
1034 err = actions_to_attr(nla_data(a), nla_len(a), skb);
1037 nla_nest_end(skb, st_sample);
1042 nla_nest_end(skb, start);
1046 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
1048 const struct nlattr *ovs_key = nla_data(a);
1049 int key_type = nla_type(ovs_key);
1050 struct nlattr *start;
1054 case OVS_KEY_ATTR_IPV4_TUNNEL:
1055 start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
1059 err = ovs_ipv4_tun_to_nlattr(skb, nla_data(ovs_key),
1063 nla_nest_end(skb, start);
1066 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
1074 static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb)
1076 const struct nlattr *a;
1079 nla_for_each_attr(a, attr, len, rem) {
1080 int type = nla_type(a);
1083 case OVS_ACTION_ATTR_SET:
1084 err = set_action_to_attr(a, skb);
1089 case OVS_ACTION_ATTR_SAMPLE:
1090 err = sample_action_to_attr(a, skb);
1095 if (nla_put(skb, type, nla_len(a), nla_data(a)))
1104 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
1106 return NLMSG_ALIGN(sizeof(struct ovs_header))
1107 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
1108 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
1109 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
1110 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
1111 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
1112 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
1115 /* Called with ovs_mutex. */
1116 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
1117 struct sk_buff *skb, u32 portid,
1118 u32 seq, u32 flags, u8 cmd)
1120 const int skb_orig_len = skb->len;
1121 struct nlattr *start;
1122 struct ovs_flow_stats stats;
1123 struct ovs_header *ovs_header;
1129 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
1133 ovs_header->dp_ifindex = get_dpifindex(dp);
1135 /* Fill flow key. */
1136 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
1138 goto nla_put_failure;
1140 err = ovs_flow_to_nlattrs(&flow->unmasked_key,
1141 &flow->unmasked_key, skb);
1144 nla_nest_end(skb, nla);
1146 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
1148 goto nla_put_failure;
1150 err = ovs_flow_to_nlattrs(&flow->key, &flow->mask->key, skb);
1154 nla_nest_end(skb, nla);
1156 spin_lock_bh(&flow->lock);
1158 stats.n_packets = flow->packet_count;
1159 stats.n_bytes = flow->byte_count;
1160 tcp_flags = flow->tcp_flags;
1161 spin_unlock_bh(&flow->lock);
1164 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
1165 goto nla_put_failure;
1167 if (stats.n_packets &&
1168 nla_put(skb, OVS_FLOW_ATTR_STATS,
1169 sizeof(struct ovs_flow_stats), &stats))
1170 goto nla_put_failure;
1173 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
1174 goto nla_put_failure;
1176 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
1177 * this is the first flow to be dumped into 'skb'. This is unusual for
1178 * Netlink but individual action lists can be longer than
1179 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
1180 * The userspace caller can always fetch the actions separately if it
1181 * really wants them. (Most userspace callers in fact don't care.)
1183 * This can only fail for dump operations because the skb is always
1184 * properly sized for single flows.
1186 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
1188 const struct sw_flow_actions *sf_acts;
1190 sf_acts = rcu_dereference_check(flow->sf_acts,
1191 lockdep_ovsl_is_held());
1193 err = actions_to_attr(sf_acts->actions, sf_acts->actions_len, skb);
1195 nla_nest_end(skb, start);
1200 nla_nest_cancel(skb, start);
1202 } else if (skb_orig_len)
1203 goto nla_put_failure;
1205 return genlmsg_end(skb, ovs_header);
1210 genlmsg_cancel(skb, ovs_header);
1214 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
1216 const struct sw_flow_actions *sf_acts;
1218 sf_acts = ovsl_dereference(flow->sf_acts);
1220 return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL);
1223 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
1224 struct datapath *dp,
1225 u32 portid, u32 seq, u8 cmd)
1227 struct sk_buff *skb;
1230 skb = ovs_flow_cmd_alloc_info(flow);
1232 return ERR_PTR(-ENOMEM);
1234 retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
1239 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
1241 struct nlattr **a = info->attrs;
1242 struct ovs_header *ovs_header = info->userhdr;
1243 struct sw_flow_key key, masked_key;
1244 struct sw_flow *flow = NULL;
1245 struct sw_flow_mask mask;
1246 struct sk_buff *reply;
1247 struct datapath *dp;
1248 struct flow_table *table;
1249 struct sw_flow_actions *acts = NULL;
1250 struct sw_flow_match match;
1255 if (!a[OVS_FLOW_ATTR_KEY])
1258 ovs_match_init(&match, &key, &mask);
1259 error = ovs_match_from_nlattrs(&match,
1260 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
1264 /* Validate actions. */
1265 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1266 acts = ovs_flow_actions_alloc(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
1267 error = PTR_ERR(acts);
1271 ovs_flow_key_mask(&masked_key, &key, &mask);
1272 error = validate_and_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
1273 &masked_key, 0, &acts);
1275 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
1278 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
1284 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1287 goto err_unlock_ovs;
1289 table = ovsl_dereference(dp->table);
1291 /* Check if this is a duplicate flow */
1292 flow = ovs_flow_lookup(table, &key);
1294 struct sw_flow_mask *mask_p;
1295 /* Bail out if we're not allowed to create a new flow. */
1297 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
1298 goto err_unlock_ovs;
1300 /* Expand table, if necessary, to make room. */
1301 if (ovs_flow_tbl_need_to_expand(table)) {
1302 struct flow_table *new_table;
1304 new_table = ovs_flow_tbl_expand(table);
1305 if (!IS_ERR(new_table)) {
1306 rcu_assign_pointer(dp->table, new_table);
1307 ovs_flow_tbl_destroy(table, true);
1308 table = ovsl_dereference(dp->table);
1312 /* Allocate flow. */
1313 flow = ovs_flow_alloc();
1315 error = PTR_ERR(flow);
1316 goto err_unlock_ovs;
1320 flow->key = masked_key;
1321 flow->unmasked_key = key;
1323 /* Make sure mask is unique in the system */
1324 mask_p = ovs_sw_flow_mask_find(table, &mask);
1326 /* Allocate a new mask if none exsits. */
1327 mask_p = ovs_sw_flow_mask_alloc();
1330 mask_p->key = mask.key;
1331 mask_p->range = mask.range;
1332 ovs_sw_flow_mask_insert(table, mask_p);
1335 ovs_sw_flow_mask_add_ref(mask_p);
1336 flow->mask = mask_p;
1337 rcu_assign_pointer(flow->sf_acts, acts);
1339 /* Put flow in bucket. */
1340 ovs_flow_insert(table, flow);
1342 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1343 info->snd_seq, OVS_FLOW_CMD_NEW);
1345 /* We found a matching flow. */
1346 struct sw_flow_actions *old_acts;
1348 /* Bail out if we're not allowed to modify an existing flow.
1349 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1350 * because Generic Netlink treats the latter as a dump
1351 * request. We also accept NLM_F_EXCL in case that bug ever
1355 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
1356 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1357 goto err_unlock_ovs;
1359 /* The unmasked key has to be the same for flow updates. */
1361 if (!ovs_flow_cmp_unmasked_key(flow, &key, match.range.end)) {
1362 OVS_NLERR("Flow modification message rejected, unmasked key does not match.\n");
1363 goto err_unlock_ovs;
1366 /* Update actions. */
1367 old_acts = ovsl_dereference(flow->sf_acts);
1368 rcu_assign_pointer(flow->sf_acts, acts);
1369 ovs_flow_deferred_free_acts(old_acts);
1371 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1372 info->snd_seq, OVS_FLOW_CMD_NEW);
1375 if (a[OVS_FLOW_ATTR_CLEAR]) {
1376 spin_lock_bh(&flow->lock);
1378 spin_unlock_bh(&flow->lock);
1384 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
1386 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1387 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1391 ovs_flow_free(flow, false);
1400 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1402 struct nlattr **a = info->attrs;
1403 struct ovs_header *ovs_header = info->userhdr;
1404 struct sw_flow_key key;
1405 struct sk_buff *reply;
1406 struct sw_flow *flow;
1407 struct datapath *dp;
1408 struct flow_table *table;
1409 struct sw_flow_match match;
1412 if (!a[OVS_FLOW_ATTR_KEY]) {
1413 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
1417 ovs_match_init(&match, &key, NULL);
1418 err = ovs_match_from_nlattrs(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1423 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1429 table = ovsl_dereference(dp->table);
1430 flow = ovs_flow_lookup_unmasked_key(table, &match);
1436 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1437 info->snd_seq, OVS_FLOW_CMD_NEW);
1438 if (IS_ERR(reply)) {
1439 err = PTR_ERR(reply);
1444 return genlmsg_reply(reply, info);
1450 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1452 struct nlattr **a = info->attrs;
1453 struct ovs_header *ovs_header = info->userhdr;
1454 struct sw_flow_key key;
1455 struct sk_buff *reply;
1456 struct sw_flow *flow;
1457 struct datapath *dp;
1458 struct flow_table *table;
1459 struct sw_flow_match match;
1463 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1469 if (!a[OVS_FLOW_ATTR_KEY]) {
1470 err = flush_flows(dp);
1474 ovs_match_init(&match, &key, NULL);
1475 err = ovs_match_from_nlattrs(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1479 table = ovsl_dereference(dp->table);
1480 flow = ovs_flow_lookup_unmasked_key(table, &match);
1486 reply = ovs_flow_cmd_alloc_info(flow);
1492 ovs_flow_remove(table, flow);
1494 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
1495 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1498 ovs_flow_free(flow, true);
1501 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
1508 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1510 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1511 struct datapath *dp;
1512 struct flow_table *table;
1515 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1521 table = rcu_dereference(dp->table);
1523 struct sw_flow *flow;
1526 bucket = cb->args[0];
1528 flow = ovs_flow_dump_next(table, &bucket, &obj);
1532 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1533 NETLINK_CB(cb->skb).portid,
1534 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1535 OVS_FLOW_CMD_NEW) < 0)
1538 cb->args[0] = bucket;
1545 static struct genl_ops dp_flow_genl_ops[] = {
1546 { .cmd = OVS_FLOW_CMD_NEW,
1547 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1548 .policy = flow_policy,
1549 .doit = ovs_flow_cmd_new_or_set
1551 { .cmd = OVS_FLOW_CMD_DEL,
1552 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1553 .policy = flow_policy,
1554 .doit = ovs_flow_cmd_del
1556 { .cmd = OVS_FLOW_CMD_GET,
1557 .flags = 0, /* OK for unprivileged users. */
1558 .policy = flow_policy,
1559 .doit = ovs_flow_cmd_get,
1560 .dumpit = ovs_flow_cmd_dump
1562 { .cmd = OVS_FLOW_CMD_SET,
1563 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1564 .policy = flow_policy,
1565 .doit = ovs_flow_cmd_new_or_set,
1569 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1570 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1571 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1574 static struct genl_family dp_datapath_genl_family = {
1575 .id = GENL_ID_GENERATE,
1576 .hdrsize = sizeof(struct ovs_header),
1577 .name = OVS_DATAPATH_FAMILY,
1578 .version = OVS_DATAPATH_VERSION,
1579 .maxattr = OVS_DP_ATTR_MAX,
1584 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1585 .name = OVS_DATAPATH_MCGROUP
1588 static size_t ovs_dp_cmd_msg_size(void)
1590 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1592 msgsize += nla_total_size(IFNAMSIZ);
1593 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1598 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1599 u32 portid, u32 seq, u32 flags, u8 cmd)
1601 struct ovs_header *ovs_header;
1602 struct ovs_dp_stats dp_stats;
1605 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1610 ovs_header->dp_ifindex = get_dpifindex(dp);
1613 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1616 goto nla_put_failure;
1618 get_dp_stats(dp, &dp_stats);
1619 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1620 goto nla_put_failure;
1622 return genlmsg_end(skb, ovs_header);
1625 genlmsg_cancel(skb, ovs_header);
1630 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1633 struct sk_buff *skb;
1636 skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1638 return ERR_PTR(-ENOMEM);
1640 retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1643 return ERR_PTR(retval);
1648 /* Called with ovs_mutex. */
1649 static struct datapath *lookup_datapath(struct net *net,
1650 struct ovs_header *ovs_header,
1651 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1653 struct datapath *dp;
1655 if (!a[OVS_DP_ATTR_NAME])
1656 dp = get_dp(net, ovs_header->dp_ifindex);
1658 struct vport *vport;
1661 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1662 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1665 return dp ? dp : ERR_PTR(-ENODEV);
1668 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1670 struct nlattr **a = info->attrs;
1671 struct vport_parms parms;
1672 struct sk_buff *reply;
1673 struct datapath *dp;
1674 struct vport *vport;
1675 struct ovs_net *ovs_net;
1679 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1685 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1687 goto err_unlock_ovs;
1689 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1691 /* Allocate table. */
1693 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1697 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1698 if (!dp->stats_percpu) {
1700 goto err_destroy_table;
1703 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1707 goto err_destroy_percpu;
1710 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1711 INIT_HLIST_HEAD(&dp->ports[i]);
1713 /* Set up our datapath device. */
1714 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1715 parms.type = OVS_VPORT_TYPE_INTERNAL;
1716 parms.options = NULL;
1718 parms.port_no = OVSP_LOCAL;
1719 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1721 vport = new_vport(&parms);
1722 if (IS_ERR(vport)) {
1723 err = PTR_ERR(vport);
1727 goto err_destroy_ports_array;
1730 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1731 info->snd_seq, OVS_DP_CMD_NEW);
1732 err = PTR_ERR(reply);
1734 goto err_destroy_local_port;
1736 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1737 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1741 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1744 err_destroy_local_port:
1745 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1746 err_destroy_ports_array:
1749 free_percpu(dp->stats_percpu);
1751 ovs_flow_tbl_destroy(ovsl_dereference(dp->table), false);
1753 release_net(ovs_dp_get_net(dp));
1761 /* Called with ovs_mutex. */
1762 static void __dp_destroy(struct datapath *dp)
1766 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1767 struct vport *vport;
1768 struct hlist_node *n;
1770 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1771 if (vport->port_no != OVSP_LOCAL)
1772 ovs_dp_detach_port(vport);
1775 list_del_rcu(&dp->list_node);
1777 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1778 * all port in datapath are destroyed first before freeing datapath.
1780 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1782 call_rcu(&dp->rcu, destroy_dp_rcu);
1785 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1787 struct sk_buff *reply;
1788 struct datapath *dp;
1792 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1797 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1798 info->snd_seq, OVS_DP_CMD_DEL);
1799 err = PTR_ERR(reply);
1806 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1814 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1816 struct sk_buff *reply;
1817 struct datapath *dp;
1821 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1826 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1827 info->snd_seq, OVS_DP_CMD_NEW);
1828 if (IS_ERR(reply)) {
1829 err = PTR_ERR(reply);
1830 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1831 ovs_dp_datapath_multicast_group.id, err);
1837 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1845 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1847 struct sk_buff *reply;
1848 struct datapath *dp;
1852 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1858 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1859 info->snd_seq, OVS_DP_CMD_NEW);
1860 if (IS_ERR(reply)) {
1861 err = PTR_ERR(reply);
1866 return genlmsg_reply(reply, info);
1873 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1875 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1876 struct datapath *dp;
1877 int skip = cb->args[0];
1881 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1883 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1884 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1885 OVS_DP_CMD_NEW) < 0)
1896 static struct genl_ops dp_datapath_genl_ops[] = {
1897 { .cmd = OVS_DP_CMD_NEW,
1898 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1899 .policy = datapath_policy,
1900 .doit = ovs_dp_cmd_new
1902 { .cmd = OVS_DP_CMD_DEL,
1903 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1904 .policy = datapath_policy,
1905 .doit = ovs_dp_cmd_del
1907 { .cmd = OVS_DP_CMD_GET,
1908 .flags = 0, /* OK for unprivileged users. */
1909 .policy = datapath_policy,
1910 .doit = ovs_dp_cmd_get,
1911 .dumpit = ovs_dp_cmd_dump
1913 { .cmd = OVS_DP_CMD_SET,
1914 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1915 .policy = datapath_policy,
1916 .doit = ovs_dp_cmd_set,
1920 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1921 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1922 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1923 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1924 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1925 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1926 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1929 static struct genl_family dp_vport_genl_family = {
1930 .id = GENL_ID_GENERATE,
1931 .hdrsize = sizeof(struct ovs_header),
1932 .name = OVS_VPORT_FAMILY,
1933 .version = OVS_VPORT_VERSION,
1934 .maxattr = OVS_VPORT_ATTR_MAX,
1939 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1940 .name = OVS_VPORT_MCGROUP
1943 /* Called with ovs_mutex or RCU read lock. */
1944 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1945 u32 portid, u32 seq, u32 flags, u8 cmd)
1947 struct ovs_header *ovs_header;
1948 struct ovs_vport_stats vport_stats;
1951 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1956 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1958 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1959 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1960 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1961 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1962 goto nla_put_failure;
1964 ovs_vport_get_stats(vport, &vport_stats);
1965 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1967 goto nla_put_failure;
1969 err = ovs_vport_get_options(vport, skb);
1970 if (err == -EMSGSIZE)
1973 return genlmsg_end(skb, ovs_header);
1978 genlmsg_cancel(skb, ovs_header);
1982 /* Called with ovs_mutex or RCU read lock. */
1983 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1986 struct sk_buff *skb;
1989 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1991 return ERR_PTR(-ENOMEM);
1993 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1999 /* Called with ovs_mutex or RCU read lock. */
2000 static struct vport *lookup_vport(struct net *net,
2001 struct ovs_header *ovs_header,
2002 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2004 struct datapath *dp;
2005 struct vport *vport;
2007 if (a[OVS_VPORT_ATTR_NAME]) {
2008 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2010 return ERR_PTR(-ENODEV);
2011 if (ovs_header->dp_ifindex &&
2012 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2013 return ERR_PTR(-ENODEV);
2015 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2016 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2018 if (port_no >= DP_MAX_PORTS)
2019 return ERR_PTR(-EFBIG);
2021 dp = get_dp(net, ovs_header->dp_ifindex);
2023 return ERR_PTR(-ENODEV);
2025 vport = ovs_vport_ovsl_rcu(dp, port_no);
2027 return ERR_PTR(-ENODEV);
2030 return ERR_PTR(-EINVAL);
2033 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2035 struct nlattr **a = info->attrs;
2036 struct ovs_header *ovs_header = info->userhdr;
2037 struct vport_parms parms;
2038 struct sk_buff *reply;
2039 struct vport *vport;
2040 struct datapath *dp;
2045 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2046 !a[OVS_VPORT_ATTR_UPCALL_PID])
2050 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2055 if (a[OVS_VPORT_ATTR_PORT_NO]) {
2056 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2059 if (port_no >= DP_MAX_PORTS)
2062 vport = ovs_vport_ovsl(dp, port_no);
2067 for (port_no = 1; ; port_no++) {
2068 if (port_no >= DP_MAX_PORTS) {
2072 vport = ovs_vport_ovsl(dp, port_no);
2078 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2079 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2080 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2082 parms.port_no = port_no;
2083 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
2085 vport = new_vport(&parms);
2086 err = PTR_ERR(vport);
2091 if (a[OVS_VPORT_ATTR_STATS])
2092 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
2094 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
2096 if (IS_ERR(reply)) {
2097 err = PTR_ERR(reply);
2098 ovs_dp_detach_port(vport);
2102 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2110 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2112 struct nlattr **a = info->attrs;
2113 struct sk_buff *reply;
2114 struct vport *vport;
2118 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2119 err = PTR_ERR(vport);
2123 if (a[OVS_VPORT_ATTR_TYPE] &&
2124 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2129 reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2135 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2136 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2141 if (a[OVS_VPORT_ATTR_STATS])
2142 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
2144 if (a[OVS_VPORT_ATTR_UPCALL_PID])
2145 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
2147 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2148 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2152 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2162 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2164 struct nlattr **a = info->attrs;
2165 struct sk_buff *reply;
2166 struct vport *vport;
2170 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2171 err = PTR_ERR(vport);
2175 if (vport->port_no == OVSP_LOCAL) {
2180 reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
2181 info->snd_seq, OVS_VPORT_CMD_DEL);
2182 err = PTR_ERR(reply);
2187 ovs_dp_detach_port(vport);
2189 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2196 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2198 struct nlattr **a = info->attrs;
2199 struct ovs_header *ovs_header = info->userhdr;
2200 struct sk_buff *reply;
2201 struct vport *vport;
2205 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2206 err = PTR_ERR(vport);
2210 reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
2211 info->snd_seq, OVS_VPORT_CMD_NEW);
2212 err = PTR_ERR(reply);
2218 return genlmsg_reply(reply, info);
2225 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2227 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2228 struct datapath *dp;
2229 int bucket = cb->args[0], skip = cb->args[1];
2232 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2237 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2238 struct vport *vport;
2241 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2243 ovs_vport_cmd_fill_info(vport, skb,
2244 NETLINK_CB(cb->skb).portid,
2247 OVS_VPORT_CMD_NEW) < 0)
2263 static struct genl_ops dp_vport_genl_ops[] = {
2264 { .cmd = OVS_VPORT_CMD_NEW,
2265 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2266 .policy = vport_policy,
2267 .doit = ovs_vport_cmd_new
2269 { .cmd = OVS_VPORT_CMD_DEL,
2270 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2271 .policy = vport_policy,
2272 .doit = ovs_vport_cmd_del
2274 { .cmd = OVS_VPORT_CMD_GET,
2275 .flags = 0, /* OK for unprivileged users. */
2276 .policy = vport_policy,
2277 .doit = ovs_vport_cmd_get,
2278 .dumpit = ovs_vport_cmd_dump
2280 { .cmd = OVS_VPORT_CMD_SET,
2281 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2282 .policy = vport_policy,
2283 .doit = ovs_vport_cmd_set,
2287 struct genl_family_and_ops {
2288 struct genl_family *family;
2289 struct genl_ops *ops;
2291 struct genl_multicast_group *group;
2294 static const struct genl_family_and_ops dp_genl_families[] = {
2295 { &dp_datapath_genl_family,
2296 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
2297 &ovs_dp_datapath_multicast_group },
2298 { &dp_vport_genl_family,
2299 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
2300 &ovs_dp_vport_multicast_group },
2301 { &dp_flow_genl_family,
2302 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
2303 &ovs_dp_flow_multicast_group },
2304 { &dp_packet_genl_family,
2305 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
2309 static void dp_unregister_genl(int n_families)
2313 for (i = 0; i < n_families; i++)
2314 genl_unregister_family(dp_genl_families[i].family);
2317 static int dp_register_genl(void)
2324 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2325 const struct genl_family_and_ops *f = &dp_genl_families[i];
2327 err = genl_register_family_with_ops(f->family, f->ops,
2334 err = genl_register_mc_group(f->family, f->group);
2343 dp_unregister_genl(n_registered);
2347 static void rehash_flow_table(struct work_struct *work)
2349 struct datapath *dp;
2355 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2357 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2358 struct flow_table *old_table = ovsl_dereference(dp->table);
2359 struct flow_table *new_table;
2361 new_table = ovs_flow_tbl_rehash(old_table);
2362 if (!IS_ERR(new_table)) {
2363 rcu_assign_pointer(dp->table, new_table);
2364 ovs_flow_tbl_destroy(old_table, true);
2370 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2373 static int __net_init ovs_init_net(struct net *net)
2375 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2377 INIT_LIST_HEAD(&ovs_net->dps);
2378 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2382 static void __net_exit ovs_exit_net(struct net *net)
2384 struct datapath *dp, *dp_next;
2385 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2388 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2392 cancel_work_sync(&ovs_net->dp_notify_work);
2395 static struct pernet_operations ovs_net_ops = {
2396 .init = ovs_init_net,
2397 .exit = ovs_exit_net,
2399 .size = sizeof(struct ovs_net),
2402 DEFINE_COMPAT_PNET_REG_FUNC(device);
2404 static int __init dp_init(void)
2408 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2410 pr_info("Open vSwitch switching datapath %s, built "__DATE__" "__TIME__"\n",
2413 err = ovs_workqueues_init();
2417 err = ovs_flow_init();
2421 err = ovs_vport_init();
2423 goto error_flow_exit;
2425 err = register_pernet_device(&ovs_net_ops);
2427 goto error_vport_exit;
2429 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2431 goto error_netns_exit;
2433 err = dp_register_genl();
2435 goto error_unreg_notifier;
2437 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2441 error_unreg_notifier:
2442 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2444 unregister_pernet_device(&ovs_net_ops);
2450 ovs_workqueues_exit();
2455 static void dp_cleanup(void)
2457 cancel_delayed_work_sync(&rehash_flow_wq);
2458 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2459 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2460 unregister_pernet_device(&ovs_net_ops);
2464 ovs_workqueues_exit();
2467 module_init(dp_init);
2468 module_exit(dp_cleanup);
2470 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2471 MODULE_LICENSE("GPL");
2472 MODULE_VERSION(VERSION);