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>
61 #include "vport-internal_dev.h"
62 #include "vport-netdev.h"
64 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18) || \
65 LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0)
66 #error Kernels before 2.6.18 or after 3.9 are not supported by this version of Open vSwitch.
69 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
70 static void rehash_flow_table(struct work_struct *work);
71 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
73 int ovs_net_id __read_mostly;
75 static void ovs_notify(struct sk_buff *skb, struct genl_info *info,
76 struct genl_multicast_group *grp)
78 genl_notify(skb, genl_info_net(info), info->snd_portid,
79 grp->id, info->nlhdr, GFP_KERNEL);
85 * All writes e.g. Writes to device state (add/remove datapath, port, set
86 * operations on vports, etc.), Writes to other state (flow table
87 * modifications, set miscellaneous datapath parameters, etc.) are protected
90 * Reads are protected by RCU.
92 * There are a few special cases (mostly stats) that have their own
93 * synchronization but they nest under all of above and don't interact with
96 * The RTNL lock nests inside ovs_mutex.
99 static DEFINE_MUTEX(ovs_mutex);
103 mutex_lock(&ovs_mutex);
106 void ovs_unlock(void)
108 mutex_unlock(&ovs_mutex);
111 #ifdef CONFIG_LOCKDEP
112 int lockdep_ovsl_is_held(void)
115 return lockdep_is_held(&ovs_mutex);
121 static struct vport *new_vport(const struct vport_parms *);
122 static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
123 const struct dp_upcall_info *);
124 static int queue_userspace_packet(struct net *, int dp_ifindex,
126 const struct dp_upcall_info *);
128 /* Must be called with rcu_read_lock or ovs_mutex. */
129 static struct datapath *get_dp(struct net *net, int dp_ifindex)
131 struct datapath *dp = NULL;
132 struct net_device *dev;
135 dev = dev_get_by_index_rcu(net, dp_ifindex);
137 struct vport *vport = ovs_internal_dev_get_vport(dev);
146 /* Must be called with rcu_read_lock or ovs_mutex. */
147 const char *ovs_dp_name(const struct datapath *dp)
149 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
150 return vport->ops->get_name(vport);
153 static int get_dpifindex(struct datapath *dp)
160 local = ovs_vport_rcu(dp, OVSP_LOCAL);
162 ifindex = netdev_vport_priv(local)->dev->ifindex;
171 static void destroy_dp_rcu(struct rcu_head *rcu)
173 struct datapath *dp = container_of(rcu, struct datapath, rcu);
175 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table, false);
176 free_percpu(dp->stats_percpu);
177 release_net(ovs_dp_get_net(dp));
182 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
185 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
188 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
191 struct hlist_head *head;
193 head = vport_hash_bucket(dp, port_no);
194 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
195 if (vport->port_no == port_no)
201 /* Called with ovs_mutex. */
202 static struct vport *new_vport(const struct vport_parms *parms)
206 vport = ovs_vport_add(parms);
207 if (!IS_ERR(vport)) {
208 struct datapath *dp = parms->dp;
209 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
211 hlist_add_head_rcu(&vport->dp_hash_node, head);
216 void ovs_dp_detach_port(struct vport *p)
220 /* First drop references to device. */
221 hlist_del_rcu(&p->dp_hash_node);
223 /* Then destroy it. */
227 /* Must be called with rcu_read_lock. */
228 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
230 struct datapath *dp = p->dp;
231 struct sw_flow *flow;
232 struct dp_stats_percpu *stats;
233 struct sw_flow_key key;
237 stats = this_cpu_ptr(dp->stats_percpu);
239 /* Extract flow from 'skb' into 'key'. */
240 error = ovs_flow_extract(skb, p->port_no, &key);
241 if (unlikely(error)) {
247 flow = ovs_flow_lookup(rcu_dereference(dp->table), &key);
248 if (unlikely(!flow)) {
249 struct dp_upcall_info upcall;
251 upcall.cmd = OVS_PACKET_CMD_MISS;
253 upcall.userdata = NULL;
254 upcall.portid = p->upcall_portid;
255 ovs_dp_upcall(dp, skb, &upcall);
257 stats_counter = &stats->n_missed;
261 OVS_CB(skb)->flow = flow;
262 OVS_CB(skb)->pkt_key = &key;
264 stats_counter = &stats->n_hit;
265 ovs_flow_used(OVS_CB(skb)->flow, skb);
266 ovs_execute_actions(dp, skb);
269 /* Update datapath statistics. */
270 u64_stats_update_begin(&stats->sync);
272 u64_stats_update_end(&stats->sync);
275 static struct genl_family dp_packet_genl_family = {
276 .id = GENL_ID_GENERATE,
277 .hdrsize = sizeof(struct ovs_header),
278 .name = OVS_PACKET_FAMILY,
279 .version = OVS_PACKET_VERSION,
280 .maxattr = OVS_PACKET_ATTR_MAX,
285 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
286 const struct dp_upcall_info *upcall_info)
288 struct dp_stats_percpu *stats;
292 if (upcall_info->portid == 0) {
297 dp_ifindex = get_dpifindex(dp);
303 forward_ip_summed(skb, true);
305 if (!skb_is_gso(skb))
306 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
308 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
315 stats = this_cpu_ptr(dp->stats_percpu);
317 u64_stats_update_begin(&stats->sync);
319 u64_stats_update_end(&stats->sync);
324 static int queue_gso_packets(struct net *net, int dp_ifindex,
326 const struct dp_upcall_info *upcall_info)
328 unsigned short gso_type = skb_shinfo(skb)->gso_type;
329 struct dp_upcall_info later_info;
330 struct sw_flow_key later_key;
331 struct sk_buff *segs, *nskb;
334 segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
336 return PTR_ERR(segs);
338 /* Queue all of the segments. */
341 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
345 if (skb == segs && gso_type & SKB_GSO_UDP) {
346 /* The initial flow key extracted by ovs_flow_extract()
347 * in this case is for a first fragment, so we need to
348 * properly mark later fragments.
350 later_key = *upcall_info->key;
351 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
353 later_info = *upcall_info;
354 later_info.key = &later_key;
355 upcall_info = &later_info;
357 } while ((skb = skb->next));
359 /* Free all of the segments. */
367 } while ((skb = nskb));
371 static size_t key_attr_size(void)
373 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
374 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */
375 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */
376 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
377 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
378 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */
379 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */
380 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
381 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */
382 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */
383 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */
384 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
385 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
386 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */
387 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */
388 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
389 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
390 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
391 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
394 static size_t upcall_msg_size(const struct sk_buff *skb,
395 const struct nlattr *userdata)
397 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
398 + nla_total_size(skb->len) /* OVS_PACKET_ATTR_PACKET */
399 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
401 /* OVS_PACKET_ATTR_USERDATA */
403 size += NLA_ALIGN(userdata->nla_len);
408 static int queue_userspace_packet(struct net *net, int dp_ifindex,
410 const struct dp_upcall_info *upcall_info)
412 struct ovs_header *upcall;
413 struct sk_buff *nskb = NULL;
414 struct sk_buff *user_skb; /* to be queued to userspace */
418 if (vlan_tx_tag_present(skb)) {
419 nskb = skb_clone(skb, GFP_ATOMIC);
423 err = vlan_deaccel_tag(nskb);
430 if (nla_attr_size(skb->len) > USHRT_MAX) {
435 user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC);
441 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
442 0, upcall_info->cmd);
443 upcall->dp_ifindex = dp_ifindex;
445 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
446 ovs_flow_to_nlattrs(upcall_info->key, upcall_info->key, user_skb);
447 nla_nest_end(user_skb, nla);
449 if (upcall_info->userdata)
450 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
451 nla_len(upcall_info->userdata),
452 nla_data(upcall_info->userdata));
454 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
456 skb_copy_and_csum_dev(skb, nla_data(nla));
458 genlmsg_end(user_skb, upcall);
459 err = genlmsg_unicast(net, user_skb, upcall_info->portid);
466 /* Called with ovs_mutex. */
467 static int flush_flows(struct datapath *dp)
469 struct flow_table *old_table;
470 struct flow_table *new_table;
472 old_table = ovsl_dereference(dp->table);
473 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
477 rcu_assign_pointer(dp->table, new_table);
479 ovs_flow_tbl_destroy(old_table, true);
483 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa, int attr_len)
486 struct sw_flow_actions *acts;
488 int req_size = NLA_ALIGN(attr_len);
489 int next_offset = offsetof(struct sw_flow_actions, actions) +
492 if (req_size <= (ksize(*sfa) - next_offset))
495 new_acts_size = ksize(*sfa) * 2;
497 if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
498 if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
499 return ERR_PTR(-EMSGSIZE);
500 new_acts_size = MAX_ACTIONS_BUFSIZE;
503 acts = ovs_flow_actions_alloc(new_acts_size);
507 memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
508 acts->actions_len = (*sfa)->actions_len;
513 (*sfa)->actions_len += req_size;
514 return (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
517 static int add_action(struct sw_flow_actions **sfa, int attrtype, void *data, int len)
521 a = reserve_sfa_size(sfa, nla_attr_size(len));
525 a->nla_type = attrtype;
526 a->nla_len = nla_attr_size(len);
529 memcpy(nla_data(a), data, len);
530 memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
535 static inline int add_nested_action_start(struct sw_flow_actions **sfa, int attrtype)
537 int used = (*sfa)->actions_len;
540 err = add_action(sfa, attrtype, NULL, 0);
547 static inline void add_nested_action_end(struct sw_flow_actions *sfa, int st_offset)
549 struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions + st_offset);
551 a->nla_len = sfa->actions_len - st_offset;
554 static int validate_and_copy_actions(const struct nlattr *attr,
555 const struct sw_flow_key *key, int depth,
556 struct sw_flow_actions **sfa);
558 static int validate_and_copy_sample(const struct nlattr *attr,
559 const struct sw_flow_key *key, int depth,
560 struct sw_flow_actions **sfa)
562 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
563 const struct nlattr *probability, *actions;
564 const struct nlattr *a;
565 int rem, start, err, st_acts;
567 memset(attrs, 0, sizeof(attrs));
568 nla_for_each_nested(a, attr, rem) {
569 int type = nla_type(a);
570 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
577 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
578 if (!probability || nla_len(probability) != sizeof(u32))
581 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
582 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
585 /* validation done, copy sample action. */
586 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE);
589 err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY, nla_data(probability), sizeof(u32));
592 st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS);
596 err = validate_and_copy_actions(actions, key, depth + 1, sfa);
600 add_nested_action_end(*sfa, st_acts);
601 add_nested_action_end(*sfa, start);
606 static int validate_tp_port(const struct sw_flow_key *flow_key)
608 if (flow_key->eth.type == htons(ETH_P_IP)) {
609 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
611 } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
612 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
619 static int validate_and_copy_set_tun(const struct nlattr *attr,
620 struct sw_flow_actions **sfa)
622 struct sw_flow_match match;
623 struct sw_flow_key key;
626 ovs_match_init(&match, &key, NULL);
627 err = ovs_ipv4_tun_from_nlattr(nla_data(attr), &match, false);
631 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET);
635 err = add_action(sfa, OVS_KEY_ATTR_IPV4_TUNNEL, &match.key->tun_key,
636 sizeof(match.key->tun_key));
637 add_nested_action_end(*sfa, start);
642 static int validate_set(const struct nlattr *a,
643 const struct sw_flow_key *flow_key,
644 struct sw_flow_actions **sfa,
647 const struct nlattr *ovs_key = nla_data(a);
648 int key_type = nla_type(ovs_key);
650 /* There can be only one key in a action */
651 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
654 if (key_type > OVS_KEY_ATTR_MAX ||
655 (ovs_key_lens[key_type] != nla_len(ovs_key) &&
656 ovs_key_lens[key_type] != -1))
660 const struct ovs_key_ipv4 *ipv4_key;
661 const struct ovs_key_ipv6 *ipv6_key;
664 case OVS_KEY_ATTR_PRIORITY:
665 case OVS_KEY_ATTR_ETHERNET:
668 case OVS_KEY_ATTR_SKB_MARK:
669 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20) && !defined(CONFIG_NETFILTER)
670 if (nla_get_u32(ovs_key) != 0)
675 case OVS_KEY_ATTR_TUNNEL:
677 err = validate_and_copy_set_tun(a, sfa);
682 case OVS_KEY_ATTR_IPV4:
683 if (flow_key->eth.type != htons(ETH_P_IP))
686 if (!flow_key->ip.proto)
689 ipv4_key = nla_data(ovs_key);
690 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
693 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
698 case OVS_KEY_ATTR_IPV6:
699 if (flow_key->eth.type != htons(ETH_P_IPV6))
702 if (!flow_key->ip.proto)
705 ipv6_key = nla_data(ovs_key);
706 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
709 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
712 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
717 case OVS_KEY_ATTR_TCP:
718 if (flow_key->ip.proto != IPPROTO_TCP)
721 return validate_tp_port(flow_key);
723 case OVS_KEY_ATTR_UDP:
724 if (flow_key->ip.proto != IPPROTO_UDP)
727 return validate_tp_port(flow_key);
729 case OVS_KEY_ATTR_SCTP:
730 if (flow_key->ip.proto != IPPROTO_SCTP)
733 return validate_tp_port(flow_key);
742 static int validate_userspace(const struct nlattr *attr)
744 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
745 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
746 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
748 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
751 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
752 attr, userspace_policy);
756 if (!a[OVS_USERSPACE_ATTR_PID] ||
757 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
763 static int copy_action(const struct nlattr *from,
764 struct sw_flow_actions **sfa)
766 int totlen = NLA_ALIGN(from->nla_len);
769 to = reserve_sfa_size(sfa, from->nla_len);
773 memcpy(to, from, totlen);
777 static int validate_and_copy_actions(const struct nlattr *attr,
778 const struct sw_flow_key *key,
780 struct sw_flow_actions **sfa)
782 const struct nlattr *a;
785 if (depth >= SAMPLE_ACTION_DEPTH)
788 nla_for_each_nested(a, attr, rem) {
789 /* Expected argument lengths, (u32)-1 for variable length. */
790 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
791 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
792 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
793 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
794 [OVS_ACTION_ATTR_POP_VLAN] = 0,
795 [OVS_ACTION_ATTR_SET] = (u32)-1,
796 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
798 const struct ovs_action_push_vlan *vlan;
799 int type = nla_type(a);
802 if (type > OVS_ACTION_ATTR_MAX ||
803 (action_lens[type] != nla_len(a) &&
804 action_lens[type] != (u32)-1))
809 case OVS_ACTION_ATTR_UNSPEC:
812 case OVS_ACTION_ATTR_USERSPACE:
813 err = validate_userspace(a);
818 case OVS_ACTION_ATTR_OUTPUT:
819 if (nla_get_u32(a) >= DP_MAX_PORTS)
824 case OVS_ACTION_ATTR_POP_VLAN:
827 case OVS_ACTION_ATTR_PUSH_VLAN:
829 if (vlan->vlan_tpid != htons(ETH_P_8021Q))
831 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
835 case OVS_ACTION_ATTR_SET:
836 err = validate_set(a, key, sfa, &skip_copy);
841 case OVS_ACTION_ATTR_SAMPLE:
842 err = validate_and_copy_sample(a, key, depth, sfa);
852 err = copy_action(a, sfa);
864 static void clear_stats(struct sw_flow *flow)
868 flow->packet_count = 0;
869 flow->byte_count = 0;
872 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
874 struct ovs_header *ovs_header = info->userhdr;
875 struct nlattr **a = info->attrs;
876 struct sw_flow_actions *acts;
877 struct sk_buff *packet;
878 struct sw_flow *flow;
885 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
886 !a[OVS_PACKET_ATTR_ACTIONS])
889 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
890 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
894 skb_reserve(packet, NET_IP_ALIGN);
896 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
898 skb_reset_mac_header(packet);
899 eth = eth_hdr(packet);
901 /* Normally, setting the skb 'protocol' field would be handled by a
902 * call to eth_type_trans(), but it assumes there's a sending
903 * device, which we may not have. */
904 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
905 packet->protocol = eth->h_proto;
907 packet->protocol = htons(ETH_P_802_2);
909 /* Build an sw_flow for sending this packet. */
910 flow = ovs_flow_alloc();
915 err = ovs_flow_extract(packet, -1, &flow->key);
919 err = ovs_flow_metadata_from_nlattrs(flow, a[OVS_PACKET_ATTR_KEY]);
922 acts = ovs_flow_actions_alloc(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
927 err = validate_and_copy_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0, &acts);
928 rcu_assign_pointer(flow->sf_acts, acts);
932 OVS_CB(packet)->flow = flow;
933 OVS_CB(packet)->pkt_key = &flow->key;
934 packet->priority = flow->key.phy.priority;
935 skb_set_mark(packet, flow->key.phy.skb_mark);
938 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
944 err = ovs_execute_actions(dp, packet);
948 ovs_flow_free(flow, false);
954 ovs_flow_free(flow, false);
961 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
962 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
963 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
965 [OVS_PACKET_ATTR_PACKET] = { .minlen = ETH_HLEN },
967 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
968 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
971 static struct genl_ops dp_packet_genl_ops[] = {
972 { .cmd = OVS_PACKET_CMD_EXECUTE,
973 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
974 .policy = packet_policy,
975 .doit = ovs_packet_cmd_execute
979 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
981 struct flow_table *table;
984 table = rcu_dereference_check(dp->table, lockdep_ovsl_is_held());
985 stats->n_flows = ovs_flow_tbl_count(table);
987 stats->n_hit = stats->n_missed = stats->n_lost = 0;
988 for_each_possible_cpu(i) {
989 const struct dp_stats_percpu *percpu_stats;
990 struct dp_stats_percpu local_stats;
993 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
996 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
997 local_stats = *percpu_stats;
998 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
1000 stats->n_hit += local_stats.n_hit;
1001 stats->n_missed += local_stats.n_missed;
1002 stats->n_lost += local_stats.n_lost;
1006 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1007 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1008 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1009 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1012 static struct genl_family dp_flow_genl_family = {
1013 .id = GENL_ID_GENERATE,
1014 .hdrsize = sizeof(struct ovs_header),
1015 .name = OVS_FLOW_FAMILY,
1016 .version = OVS_FLOW_VERSION,
1017 .maxattr = OVS_FLOW_ATTR_MAX,
1022 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
1023 .name = OVS_FLOW_MCGROUP
1026 static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb);
1027 static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb)
1029 const struct nlattr *a;
1030 struct nlattr *start;
1033 start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
1037 nla_for_each_nested(a, attr, rem) {
1038 int type = nla_type(a);
1039 struct nlattr *st_sample;
1042 case OVS_SAMPLE_ATTR_PROBABILITY:
1043 if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY, sizeof(u32), nla_data(a)))
1046 case OVS_SAMPLE_ATTR_ACTIONS:
1047 st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
1050 err = actions_to_attr(nla_data(a), nla_len(a), skb);
1053 nla_nest_end(skb, st_sample);
1058 nla_nest_end(skb, start);
1062 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
1064 const struct nlattr *ovs_key = nla_data(a);
1065 int key_type = nla_type(ovs_key);
1066 struct nlattr *start;
1070 case OVS_KEY_ATTR_IPV4_TUNNEL:
1071 start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
1075 err = ovs_ipv4_tun_to_nlattr(skb, nla_data(ovs_key),
1079 nla_nest_end(skb, start);
1082 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
1090 static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb)
1092 const struct nlattr *a;
1095 nla_for_each_attr(a, attr, len, rem) {
1096 int type = nla_type(a);
1099 case OVS_ACTION_ATTR_SET:
1100 err = set_action_to_attr(a, skb);
1105 case OVS_ACTION_ATTR_SAMPLE:
1106 err = sample_action_to_attr(a, skb);
1111 if (nla_put(skb, type, nla_len(a), nla_data(a)))
1120 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
1122 return NLMSG_ALIGN(sizeof(struct ovs_header))
1123 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
1124 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
1125 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
1126 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
1127 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
1128 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
1131 /* Called with ovs_mutex. */
1132 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
1133 struct sk_buff *skb, u32 portid,
1134 u32 seq, u32 flags, u8 cmd)
1136 const int skb_orig_len = skb->len;
1137 struct nlattr *start;
1138 struct ovs_flow_stats stats;
1139 struct ovs_header *ovs_header;
1145 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
1149 ovs_header->dp_ifindex = get_dpifindex(dp);
1151 /* Fill flow key. */
1152 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
1154 goto nla_put_failure;
1156 err = ovs_flow_to_nlattrs(&flow->unmasked_key,
1157 &flow->unmasked_key, skb);
1160 nla_nest_end(skb, nla);
1162 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
1164 goto nla_put_failure;
1166 err = ovs_flow_to_nlattrs(&flow->key, &flow->mask->key, skb);
1170 nla_nest_end(skb, nla);
1172 spin_lock_bh(&flow->lock);
1174 stats.n_packets = flow->packet_count;
1175 stats.n_bytes = flow->byte_count;
1176 tcp_flags = flow->tcp_flags;
1177 spin_unlock_bh(&flow->lock);
1180 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
1181 goto nla_put_failure;
1183 if (stats.n_packets &&
1184 nla_put(skb, OVS_FLOW_ATTR_STATS,
1185 sizeof(struct ovs_flow_stats), &stats))
1186 goto nla_put_failure;
1189 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
1190 goto nla_put_failure;
1192 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
1193 * this is the first flow to be dumped into 'skb'. This is unusual for
1194 * Netlink but individual action lists can be longer than
1195 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
1196 * The userspace caller can always fetch the actions separately if it
1197 * really wants them. (Most userspace callers in fact don't care.)
1199 * This can only fail for dump operations because the skb is always
1200 * properly sized for single flows.
1202 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
1204 const struct sw_flow_actions *sf_acts;
1206 sf_acts = rcu_dereference_check(flow->sf_acts,
1207 lockdep_ovsl_is_held());
1209 err = actions_to_attr(sf_acts->actions, sf_acts->actions_len, skb);
1211 nla_nest_end(skb, start);
1216 nla_nest_cancel(skb, start);
1218 } else if (skb_orig_len)
1219 goto nla_put_failure;
1221 return genlmsg_end(skb, ovs_header);
1226 genlmsg_cancel(skb, ovs_header);
1230 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
1232 const struct sw_flow_actions *sf_acts;
1234 sf_acts = ovsl_dereference(flow->sf_acts);
1236 return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL);
1239 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
1240 struct datapath *dp,
1241 u32 portid, u32 seq, u8 cmd)
1243 struct sk_buff *skb;
1246 skb = ovs_flow_cmd_alloc_info(flow);
1248 return ERR_PTR(-ENOMEM);
1250 retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
1255 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
1257 struct nlattr **a = info->attrs;
1258 struct ovs_header *ovs_header = info->userhdr;
1259 struct sw_flow_key key, masked_key;
1260 struct sw_flow *flow = NULL;
1261 struct sw_flow_mask mask;
1262 struct sk_buff *reply;
1263 struct datapath *dp;
1264 struct flow_table *table;
1265 struct sw_flow_actions *acts = NULL;
1266 struct sw_flow_match match;
1271 if (!a[OVS_FLOW_ATTR_KEY])
1274 ovs_match_init(&match, &key, &mask);
1275 error = ovs_match_from_nlattrs(&match,
1276 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
1280 /* Validate actions. */
1281 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1282 acts = ovs_flow_actions_alloc(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
1283 error = PTR_ERR(acts);
1287 ovs_flow_key_mask(&masked_key, &key, &mask);
1288 error = validate_and_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
1289 &masked_key, 0, &acts);
1291 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
1294 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
1300 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1303 goto err_unlock_ovs;
1305 table = ovsl_dereference(dp->table);
1307 /* Check if this is a duplicate flow */
1308 flow = ovs_flow_lookup(table, &key);
1310 struct sw_flow_mask *mask_p;
1311 /* Bail out if we're not allowed to create a new flow. */
1313 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
1314 goto err_unlock_ovs;
1316 /* Expand table, if necessary, to make room. */
1317 if (ovs_flow_tbl_need_to_expand(table)) {
1318 struct flow_table *new_table;
1320 new_table = ovs_flow_tbl_expand(table);
1321 if (!IS_ERR(new_table)) {
1322 rcu_assign_pointer(dp->table, new_table);
1323 ovs_flow_tbl_destroy(table, true);
1324 table = ovsl_dereference(dp->table);
1328 /* Allocate flow. */
1329 flow = ovs_flow_alloc();
1331 error = PTR_ERR(flow);
1332 goto err_unlock_ovs;
1336 flow->key = masked_key;
1337 flow->unmasked_key = key;
1339 /* Make sure mask is unique in the system */
1340 mask_p = ovs_sw_flow_mask_find(table, &mask);
1342 /* Allocate a new mask if none exsits. */
1343 mask_p = ovs_sw_flow_mask_alloc();
1346 mask_p->key = mask.key;
1347 mask_p->range = mask.range;
1348 ovs_sw_flow_mask_insert(table, mask_p);
1351 ovs_sw_flow_mask_add_ref(mask_p);
1352 flow->mask = mask_p;
1353 rcu_assign_pointer(flow->sf_acts, acts);
1355 /* Put flow in bucket. */
1356 ovs_flow_insert(table, flow);
1358 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1359 info->snd_seq, OVS_FLOW_CMD_NEW);
1361 /* We found a matching flow. */
1362 struct sw_flow_actions *old_acts;
1364 /* Bail out if we're not allowed to modify an existing flow.
1365 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1366 * because Generic Netlink treats the latter as a dump
1367 * request. We also accept NLM_F_EXCL in case that bug ever
1371 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
1372 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1373 goto err_unlock_ovs;
1375 /* The unmasked key has to be the same for flow updates. */
1377 if (!ovs_flow_cmp_unmasked_key(flow, &key, match.range.end)) {
1378 OVS_NLERR("Flow modification message rejected, unmasked key does not match.\n");
1379 goto err_unlock_ovs;
1382 /* Update actions. */
1383 old_acts = ovsl_dereference(flow->sf_acts);
1384 rcu_assign_pointer(flow->sf_acts, acts);
1385 ovs_flow_deferred_free_acts(old_acts);
1387 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1388 info->snd_seq, OVS_FLOW_CMD_NEW);
1391 if (a[OVS_FLOW_ATTR_CLEAR]) {
1392 spin_lock_bh(&flow->lock);
1394 spin_unlock_bh(&flow->lock);
1400 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
1402 netlink_set_err(GENL_SOCK(sock_net(skb->sk)), 0,
1403 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1407 ovs_flow_free(flow, false);
1416 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1418 struct nlattr **a = info->attrs;
1419 struct ovs_header *ovs_header = info->userhdr;
1420 struct sw_flow_key key;
1421 struct sk_buff *reply;
1422 struct sw_flow *flow;
1423 struct datapath *dp;
1424 struct flow_table *table;
1425 struct sw_flow_match match;
1428 if (!a[OVS_FLOW_ATTR_KEY]) {
1429 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
1433 ovs_match_init(&match, &key, NULL);
1434 err = ovs_match_from_nlattrs(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1439 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1445 table = ovsl_dereference(dp->table);
1446 flow = ovs_flow_lookup_unmasked_key(table, &match);
1452 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1453 info->snd_seq, OVS_FLOW_CMD_NEW);
1454 if (IS_ERR(reply)) {
1455 err = PTR_ERR(reply);
1460 return genlmsg_reply(reply, info);
1466 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1468 struct nlattr **a = info->attrs;
1469 struct ovs_header *ovs_header = info->userhdr;
1470 struct sw_flow_key key;
1471 struct sk_buff *reply;
1472 struct sw_flow *flow;
1473 struct datapath *dp;
1474 struct flow_table *table;
1475 struct sw_flow_match match;
1479 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1485 if (!a[OVS_FLOW_ATTR_KEY]) {
1486 err = flush_flows(dp);
1490 ovs_match_init(&match, &key, NULL);
1491 err = ovs_match_from_nlattrs(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1495 table = ovsl_dereference(dp->table);
1496 flow = ovs_flow_lookup_unmasked_key(table, &match);
1502 reply = ovs_flow_cmd_alloc_info(flow);
1508 ovs_flow_remove(table, flow);
1510 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
1511 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1514 ovs_flow_free(flow, true);
1517 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
1524 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1526 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1527 struct datapath *dp;
1528 struct flow_table *table;
1531 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1537 table = rcu_dereference(dp->table);
1539 struct sw_flow *flow;
1542 bucket = cb->args[0];
1544 flow = ovs_flow_dump_next(table, &bucket, &obj);
1548 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1549 NETLINK_CB(cb->skb).portid,
1550 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1551 OVS_FLOW_CMD_NEW) < 0)
1554 cb->args[0] = bucket;
1561 static struct genl_ops dp_flow_genl_ops[] = {
1562 { .cmd = OVS_FLOW_CMD_NEW,
1563 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1564 .policy = flow_policy,
1565 .doit = ovs_flow_cmd_new_or_set
1567 { .cmd = OVS_FLOW_CMD_DEL,
1568 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1569 .policy = flow_policy,
1570 .doit = ovs_flow_cmd_del
1572 { .cmd = OVS_FLOW_CMD_GET,
1573 .flags = 0, /* OK for unprivileged users. */
1574 .policy = flow_policy,
1575 .doit = ovs_flow_cmd_get,
1576 .dumpit = ovs_flow_cmd_dump
1578 { .cmd = OVS_FLOW_CMD_SET,
1579 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1580 .policy = flow_policy,
1581 .doit = ovs_flow_cmd_new_or_set,
1585 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1586 #ifdef HAVE_NLA_NUL_STRING
1587 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1589 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1592 static struct genl_family dp_datapath_genl_family = {
1593 .id = GENL_ID_GENERATE,
1594 .hdrsize = sizeof(struct ovs_header),
1595 .name = OVS_DATAPATH_FAMILY,
1596 .version = OVS_DATAPATH_VERSION,
1597 .maxattr = OVS_DP_ATTR_MAX,
1602 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1603 .name = OVS_DATAPATH_MCGROUP
1606 static size_t ovs_dp_cmd_msg_size(void)
1608 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1610 msgsize += nla_total_size(IFNAMSIZ);
1611 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1616 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1617 u32 portid, u32 seq, u32 flags, u8 cmd)
1619 struct ovs_header *ovs_header;
1620 struct ovs_dp_stats dp_stats;
1623 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1628 ovs_header->dp_ifindex = get_dpifindex(dp);
1631 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1634 goto nla_put_failure;
1636 get_dp_stats(dp, &dp_stats);
1637 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1638 goto nla_put_failure;
1640 return genlmsg_end(skb, ovs_header);
1643 genlmsg_cancel(skb, ovs_header);
1648 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1651 struct sk_buff *skb;
1654 skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1656 return ERR_PTR(-ENOMEM);
1658 retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1661 return ERR_PTR(retval);
1666 static int ovs_dp_cmd_validate(struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1668 return CHECK_NUL_STRING(a[OVS_DP_ATTR_NAME], IFNAMSIZ - 1);
1671 /* Called with ovs_mutex. */
1672 static struct datapath *lookup_datapath(struct net *net,
1673 struct ovs_header *ovs_header,
1674 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1676 struct datapath *dp;
1678 if (!a[OVS_DP_ATTR_NAME])
1679 dp = get_dp(net, ovs_header->dp_ifindex);
1681 struct vport *vport;
1684 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1685 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1688 return dp ? dp : ERR_PTR(-ENODEV);
1691 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1693 struct nlattr **a = info->attrs;
1694 struct vport_parms parms;
1695 struct sk_buff *reply;
1696 struct datapath *dp;
1697 struct vport *vport;
1698 struct ovs_net *ovs_net;
1702 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1705 err = ovs_dp_cmd_validate(a);
1712 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1714 goto err_unlock_ovs;
1716 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1718 /* Allocate table. */
1720 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1724 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1725 if (!dp->stats_percpu) {
1727 goto err_destroy_table;
1730 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1734 goto err_destroy_percpu;
1737 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1738 INIT_HLIST_HEAD(&dp->ports[i]);
1740 /* Set up our datapath device. */
1741 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1742 parms.type = OVS_VPORT_TYPE_INTERNAL;
1743 parms.options = NULL;
1745 parms.port_no = OVSP_LOCAL;
1746 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1748 vport = new_vport(&parms);
1749 if (IS_ERR(vport)) {
1750 err = PTR_ERR(vport);
1754 goto err_destroy_ports_array;
1757 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1758 info->snd_seq, OVS_DP_CMD_NEW);
1759 err = PTR_ERR(reply);
1761 goto err_destroy_local_port;
1763 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1764 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1768 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1771 err_destroy_local_port:
1772 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1773 err_destroy_ports_array:
1776 free_percpu(dp->stats_percpu);
1778 ovs_flow_tbl_destroy(ovsl_dereference(dp->table), false);
1780 release_net(ovs_dp_get_net(dp));
1788 /* Called with ovs_mutex. */
1789 static void __dp_destroy(struct datapath *dp)
1793 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1794 struct vport *vport;
1795 struct hlist_node *n;
1797 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1798 if (vport->port_no != OVSP_LOCAL)
1799 ovs_dp_detach_port(vport);
1802 list_del_rcu(&dp->list_node);
1804 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1805 * all port in datapath are destroyed first before freeing datapath.
1807 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1809 call_rcu(&dp->rcu, destroy_dp_rcu);
1812 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1814 struct sk_buff *reply;
1815 struct datapath *dp;
1818 err = ovs_dp_cmd_validate(info->attrs);
1823 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1828 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1829 info->snd_seq, OVS_DP_CMD_DEL);
1830 err = PTR_ERR(reply);
1837 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1845 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1847 struct sk_buff *reply;
1848 struct datapath *dp;
1851 err = ovs_dp_cmd_validate(info->attrs);
1856 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1861 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1862 info->snd_seq, OVS_DP_CMD_NEW);
1863 if (IS_ERR(reply)) {
1864 err = PTR_ERR(reply);
1865 netlink_set_err(GENL_SOCK(sock_net(skb->sk)), 0,
1866 ovs_dp_datapath_multicast_group.id, err);
1872 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1880 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1882 struct sk_buff *reply;
1883 struct datapath *dp;
1886 err = ovs_dp_cmd_validate(info->attrs);
1891 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1897 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1898 info->snd_seq, OVS_DP_CMD_NEW);
1899 if (IS_ERR(reply)) {
1900 err = PTR_ERR(reply);
1905 return genlmsg_reply(reply, info);
1912 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1914 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1915 struct datapath *dp;
1916 int skip = cb->args[0];
1920 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1922 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1923 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1924 OVS_DP_CMD_NEW) < 0)
1935 static struct genl_ops dp_datapath_genl_ops[] = {
1936 { .cmd = OVS_DP_CMD_NEW,
1937 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1938 .policy = datapath_policy,
1939 .doit = ovs_dp_cmd_new
1941 { .cmd = OVS_DP_CMD_DEL,
1942 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1943 .policy = datapath_policy,
1944 .doit = ovs_dp_cmd_del
1946 { .cmd = OVS_DP_CMD_GET,
1947 .flags = 0, /* OK for unprivileged users. */
1948 .policy = datapath_policy,
1949 .doit = ovs_dp_cmd_get,
1950 .dumpit = ovs_dp_cmd_dump
1952 { .cmd = OVS_DP_CMD_SET,
1953 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1954 .policy = datapath_policy,
1955 .doit = ovs_dp_cmd_set,
1959 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1960 #ifdef HAVE_NLA_NUL_STRING
1961 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1962 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1964 [OVS_VPORT_ATTR_STATS] = { .minlen = sizeof(struct ovs_vport_stats) },
1966 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1967 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1968 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1969 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1972 static struct genl_family dp_vport_genl_family = {
1973 .id = GENL_ID_GENERATE,
1974 .hdrsize = sizeof(struct ovs_header),
1975 .name = OVS_VPORT_FAMILY,
1976 .version = OVS_VPORT_VERSION,
1977 .maxattr = OVS_VPORT_ATTR_MAX,
1982 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1983 .name = OVS_VPORT_MCGROUP
1986 /* Called with ovs_mutex or RCU read lock. */
1987 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1988 u32 portid, u32 seq, u32 flags, u8 cmd)
1990 struct ovs_header *ovs_header;
1991 struct ovs_vport_stats vport_stats;
1994 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1999 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
2001 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
2002 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
2003 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
2004 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
2005 goto nla_put_failure;
2007 ovs_vport_get_stats(vport, &vport_stats);
2008 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
2010 goto nla_put_failure;
2012 err = ovs_vport_get_options(vport, skb);
2013 if (err == -EMSGSIZE)
2016 return genlmsg_end(skb, ovs_header);
2021 genlmsg_cancel(skb, ovs_header);
2025 /* Called with ovs_mutex or RCU read lock. */
2026 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
2029 struct sk_buff *skb;
2032 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2034 return ERR_PTR(-ENOMEM);
2036 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
2042 static int ovs_vport_cmd_validate(struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2044 return CHECK_NUL_STRING(a[OVS_VPORT_ATTR_NAME], IFNAMSIZ - 1);
2047 /* Called with ovs_mutex or RCU read lock. */
2048 static struct vport *lookup_vport(struct net *net,
2049 struct ovs_header *ovs_header,
2050 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2052 struct datapath *dp;
2053 struct vport *vport;
2055 if (a[OVS_VPORT_ATTR_NAME]) {
2056 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2058 return ERR_PTR(-ENODEV);
2059 if (ovs_header->dp_ifindex &&
2060 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2061 return ERR_PTR(-ENODEV);
2063 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2064 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2066 if (port_no >= DP_MAX_PORTS)
2067 return ERR_PTR(-EFBIG);
2069 dp = get_dp(net, ovs_header->dp_ifindex);
2071 return ERR_PTR(-ENODEV);
2073 vport = ovs_vport_ovsl_rcu(dp, port_no);
2075 return ERR_PTR(-ENODEV);
2078 return ERR_PTR(-EINVAL);
2081 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2083 struct nlattr **a = info->attrs;
2084 struct ovs_header *ovs_header = info->userhdr;
2085 struct vport_parms parms;
2086 struct sk_buff *reply;
2087 struct vport *vport;
2088 struct datapath *dp;
2093 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2094 !a[OVS_VPORT_ATTR_UPCALL_PID])
2097 err = ovs_vport_cmd_validate(a);
2102 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2107 if (a[OVS_VPORT_ATTR_PORT_NO]) {
2108 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2111 if (port_no >= DP_MAX_PORTS)
2114 vport = ovs_vport_ovsl(dp, port_no);
2119 for (port_no = 1; ; port_no++) {
2120 if (port_no >= DP_MAX_PORTS) {
2124 vport = ovs_vport_ovsl(dp, port_no);
2130 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2131 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2132 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2134 parms.port_no = port_no;
2135 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
2137 vport = new_vport(&parms);
2138 err = PTR_ERR(vport);
2143 if (a[OVS_VPORT_ATTR_STATS])
2144 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
2146 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
2148 if (IS_ERR(reply)) {
2149 err = PTR_ERR(reply);
2150 ovs_dp_detach_port(vport);
2154 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2162 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2164 struct nlattr **a = info->attrs;
2165 struct sk_buff *reply;
2166 struct vport *vport;
2169 err = ovs_vport_cmd_validate(a);
2174 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2175 err = PTR_ERR(vport);
2179 if (a[OVS_VPORT_ATTR_TYPE] &&
2180 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2185 reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2191 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2192 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2197 if (a[OVS_VPORT_ATTR_STATS])
2198 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
2200 if (a[OVS_VPORT_ATTR_UPCALL_PID])
2201 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
2203 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2204 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2208 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2219 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2221 struct nlattr **a = info->attrs;
2222 struct sk_buff *reply;
2223 struct vport *vport;
2226 err = ovs_vport_cmd_validate(a);
2231 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2232 err = PTR_ERR(vport);
2236 if (vport->port_no == OVSP_LOCAL) {
2241 reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
2242 info->snd_seq, OVS_VPORT_CMD_DEL);
2243 err = PTR_ERR(reply);
2248 ovs_dp_detach_port(vport);
2250 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2258 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2260 struct nlattr **a = info->attrs;
2261 struct ovs_header *ovs_header = info->userhdr;
2262 struct sk_buff *reply;
2263 struct vport *vport;
2266 err = ovs_vport_cmd_validate(a);
2271 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2272 err = PTR_ERR(vport);
2276 reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
2277 info->snd_seq, OVS_VPORT_CMD_NEW);
2278 err = PTR_ERR(reply);
2284 return genlmsg_reply(reply, info);
2292 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2294 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2295 struct datapath *dp;
2296 int bucket = cb->args[0], skip = cb->args[1];
2299 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2304 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2305 struct vport *vport;
2308 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2310 ovs_vport_cmd_fill_info(vport, skb,
2311 NETLINK_CB(cb->skb).portid,
2314 OVS_VPORT_CMD_NEW) < 0)
2330 static struct genl_ops dp_vport_genl_ops[] = {
2331 { .cmd = OVS_VPORT_CMD_NEW,
2332 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2333 .policy = vport_policy,
2334 .doit = ovs_vport_cmd_new
2336 { .cmd = OVS_VPORT_CMD_DEL,
2337 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2338 .policy = vport_policy,
2339 .doit = ovs_vport_cmd_del
2341 { .cmd = OVS_VPORT_CMD_GET,
2342 .flags = 0, /* OK for unprivileged users. */
2343 .policy = vport_policy,
2344 .doit = ovs_vport_cmd_get,
2345 .dumpit = ovs_vport_cmd_dump
2347 { .cmd = OVS_VPORT_CMD_SET,
2348 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2349 .policy = vport_policy,
2350 .doit = ovs_vport_cmd_set,
2354 struct genl_family_and_ops {
2355 struct genl_family *family;
2356 struct genl_ops *ops;
2358 struct genl_multicast_group *group;
2361 static const struct genl_family_and_ops dp_genl_families[] = {
2362 { &dp_datapath_genl_family,
2363 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
2364 &ovs_dp_datapath_multicast_group },
2365 { &dp_vport_genl_family,
2366 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
2367 &ovs_dp_vport_multicast_group },
2368 { &dp_flow_genl_family,
2369 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
2370 &ovs_dp_flow_multicast_group },
2371 { &dp_packet_genl_family,
2372 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
2376 static void dp_unregister_genl(int n_families)
2380 for (i = 0; i < n_families; i++)
2381 genl_unregister_family(dp_genl_families[i].family);
2384 static int dp_register_genl(void)
2391 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2392 const struct genl_family_and_ops *f = &dp_genl_families[i];
2394 err = genl_register_family_with_ops(f->family, f->ops,
2401 err = genl_register_mc_group(f->family, f->group);
2410 dp_unregister_genl(n_registered);
2414 static void rehash_flow_table(struct work_struct *work)
2416 struct datapath *dp;
2422 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2424 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2425 struct flow_table *old_table = ovsl_dereference(dp->table);
2426 struct flow_table *new_table;
2428 new_table = ovs_flow_tbl_rehash(old_table);
2429 if (!IS_ERR(new_table)) {
2430 rcu_assign_pointer(dp->table, new_table);
2431 ovs_flow_tbl_destroy(old_table, true);
2437 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2440 static int __net_init ovs_init_net(struct net *net)
2442 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2444 INIT_LIST_HEAD(&ovs_net->dps);
2445 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2449 static void __net_exit ovs_exit_net(struct net *net)
2451 struct datapath *dp, *dp_next;
2452 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2455 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2459 cancel_work_sync(&ovs_net->dp_notify_work);
2462 static struct pernet_operations ovs_net_ops = {
2463 .init = ovs_init_net,
2464 .exit = ovs_exit_net,
2466 .size = sizeof(struct ovs_net),
2469 DEFINE_COMPAT_PNET_REG_FUNC(device);
2471 static int __init dp_init(void)
2475 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2477 pr_info("Open vSwitch switching datapath %s, built "__DATE__" "__TIME__"\n",
2480 err = ovs_workqueues_init();
2484 err = ovs_flow_init();
2488 err = ovs_vport_init();
2490 goto error_flow_exit;
2492 err = register_pernet_device(&ovs_net_ops);
2494 goto error_vport_exit;
2496 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2498 goto error_netns_exit;
2500 err = dp_register_genl();
2502 goto error_unreg_notifier;
2504 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2508 error_unreg_notifier:
2509 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2511 unregister_pernet_device(&ovs_net_ops);
2517 ovs_workqueues_exit();
2522 static void dp_cleanup(void)
2524 cancel_delayed_work_sync(&rehash_flow_wq);
2525 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2526 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2527 unregister_pernet_device(&ovs_net_ops);
2531 ovs_workqueues_exit();
2534 module_init(dp_init);
2535 module_exit(dp_cleanup);
2537 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2538 MODULE_LICENSE("GPL");
2539 MODULE_VERSION(VERSION);