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>
62 #include "vport-internal_dev.h"
63 #include "vport-netdev.h"
65 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18) || \
66 LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0)
67 #error Kernels before 2.6.18 or after 3.9 are not supported by this version of Open vSwitch.
70 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
71 static void rehash_flow_table(struct work_struct *work);
72 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
74 int ovs_net_id __read_mostly;
76 static void ovs_notify(struct sk_buff *skb, struct genl_info *info,
77 struct genl_multicast_group *grp)
79 genl_notify(skb, genl_info_net(info), info->snd_portid,
80 grp->id, info->nlhdr, GFP_KERNEL);
86 * All writes e.g. Writes to device state (add/remove datapath, port, set
87 * operations on vports, etc.), Writes to other state (flow table
88 * modifications, set miscellaneous datapath parameters, etc.) are protected
91 * Reads are protected by RCU.
93 * There are a few special cases (mostly stats) that have their own
94 * synchronization but they nest under all of above and don't interact with
97 * The RTNL lock nests inside ovs_mutex.
100 static DEFINE_MUTEX(ovs_mutex);
104 mutex_lock(&ovs_mutex);
107 void ovs_unlock(void)
109 mutex_unlock(&ovs_mutex);
112 #ifdef CONFIG_LOCKDEP
113 int lockdep_ovsl_is_held(void)
116 return lockdep_is_held(&ovs_mutex);
122 static struct vport *new_vport(const struct vport_parms *);
123 static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
124 const struct dp_upcall_info *);
125 static int queue_userspace_packet(struct net *, int dp_ifindex,
127 const struct dp_upcall_info *);
129 /* Must be called with rcu_read_lock or ovs_mutex. */
130 static struct datapath *get_dp(struct net *net, int dp_ifindex)
132 struct datapath *dp = NULL;
133 struct net_device *dev;
136 dev = dev_get_by_index_rcu(net, dp_ifindex);
138 struct vport *vport = ovs_internal_dev_get_vport(dev);
147 /* Must be called with rcu_read_lock or ovs_mutex. */
148 const char *ovs_dp_name(const struct datapath *dp)
150 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
151 return vport->ops->get_name(vport);
154 static int get_dpifindex(struct datapath *dp)
161 local = ovs_vport_rcu(dp, OVSP_LOCAL);
163 ifindex = netdev_vport_priv(local)->dev->ifindex;
172 static void destroy_dp_rcu(struct rcu_head *rcu)
174 struct datapath *dp = container_of(rcu, struct datapath, rcu);
176 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table, false);
177 free_percpu(dp->stats_percpu);
178 release_net(ovs_dp_get_net(dp));
183 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
186 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
189 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
192 struct hlist_head *head;
194 head = vport_hash_bucket(dp, port_no);
195 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
196 if (vport->port_no == port_no)
202 /* Called with ovs_mutex. */
203 static struct vport *new_vport(const struct vport_parms *parms)
207 vport = ovs_vport_add(parms);
208 if (!IS_ERR(vport)) {
209 struct datapath *dp = parms->dp;
210 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
212 hlist_add_head_rcu(&vport->dp_hash_node, head);
217 void ovs_dp_detach_port(struct vport *p)
221 /* First drop references to device. */
222 hlist_del_rcu(&p->dp_hash_node);
224 /* Then destroy it. */
228 /* Must be called with rcu_read_lock. */
229 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
231 struct datapath *dp = p->dp;
232 struct sw_flow *flow;
233 struct dp_stats_percpu *stats;
234 struct sw_flow_key key;
238 stats = this_cpu_ptr(dp->stats_percpu);
240 /* Extract flow from 'skb' into 'key'. */
241 error = ovs_flow_extract(skb, p->port_no, &key);
242 if (unlikely(error)) {
248 flow = ovs_flow_lookup(rcu_dereference(dp->table), &key);
249 if (unlikely(!flow)) {
250 struct dp_upcall_info upcall;
252 upcall.cmd = OVS_PACKET_CMD_MISS;
254 upcall.userdata = NULL;
255 upcall.portid = p->upcall_portid;
256 ovs_dp_upcall(dp, skb, &upcall);
258 stats_counter = &stats->n_missed;
262 OVS_CB(skb)->flow = flow;
263 OVS_CB(skb)->pkt_key = &key;
265 stats_counter = &stats->n_hit;
266 ovs_flow_used(OVS_CB(skb)->flow, skb);
267 ovs_execute_actions(dp, skb);
270 /* Update datapath statistics. */
271 u64_stats_update_begin(&stats->sync);
273 u64_stats_update_end(&stats->sync);
276 static struct genl_family dp_packet_genl_family = {
277 .id = GENL_ID_GENERATE,
278 .hdrsize = sizeof(struct ovs_header),
279 .name = OVS_PACKET_FAMILY,
280 .version = OVS_PACKET_VERSION,
281 .maxattr = OVS_PACKET_ATTR_MAX,
286 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
287 const struct dp_upcall_info *upcall_info)
289 struct dp_stats_percpu *stats;
293 if (upcall_info->portid == 0) {
298 dp_ifindex = get_dpifindex(dp);
304 forward_ip_summed(skb, true);
306 if (!skb_is_gso(skb))
307 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
309 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
316 stats = this_cpu_ptr(dp->stats_percpu);
318 u64_stats_update_begin(&stats->sync);
320 u64_stats_update_end(&stats->sync);
325 static int queue_gso_packets(struct net *net, int dp_ifindex,
327 const struct dp_upcall_info *upcall_info)
329 unsigned short gso_type = skb_shinfo(skb)->gso_type;
330 struct dp_upcall_info later_info;
331 struct sw_flow_key later_key;
332 struct sk_buff *segs, *nskb;
335 segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
337 return PTR_ERR(segs);
339 /* Queue all of the segments. */
342 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
346 if (skb == segs && gso_type & SKB_GSO_UDP) {
347 /* The initial flow key extracted by ovs_flow_extract()
348 * in this case is for a first fragment, so we need to
349 * properly mark later fragments.
351 later_key = *upcall_info->key;
352 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
354 later_info = *upcall_info;
355 later_info.key = &later_key;
356 upcall_info = &later_info;
358 } while ((skb = skb->next));
360 /* Free all of the segments. */
368 } while ((skb = nskb));
372 static size_t key_attr_size(void)
374 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
375 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */
376 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */
377 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
378 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
379 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */
380 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */
381 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
382 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */
383 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */
384 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */
385 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
386 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
387 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */
388 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */
389 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
390 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
391 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
392 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
395 static size_t upcall_msg_size(const struct sk_buff *skb,
396 const struct nlattr *userdata)
398 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
399 + nla_total_size(skb->len) /* OVS_PACKET_ATTR_PACKET */
400 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
402 /* OVS_PACKET_ATTR_USERDATA */
404 size += NLA_ALIGN(userdata->nla_len);
409 static int queue_userspace_packet(struct net *net, int dp_ifindex,
411 const struct dp_upcall_info *upcall_info)
413 struct ovs_header *upcall;
414 struct sk_buff *nskb = NULL;
415 struct sk_buff *user_skb; /* to be queued to userspace */
419 if (vlan_tx_tag_present(skb)) {
420 nskb = skb_clone(skb, GFP_ATOMIC);
424 err = vlan_deaccel_tag(nskb);
431 if (nla_attr_size(skb->len) > USHRT_MAX) {
436 user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC);
442 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
443 0, upcall_info->cmd);
444 upcall->dp_ifindex = dp_ifindex;
446 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
447 ovs_flow_to_nlattrs(upcall_info->key, upcall_info->key, user_skb);
448 nla_nest_end(user_skb, nla);
450 if (upcall_info->userdata)
451 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
452 nla_len(upcall_info->userdata),
453 nla_data(upcall_info->userdata));
455 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
457 skb_copy_and_csum_dev(skb, nla_data(nla));
459 genlmsg_end(user_skb, upcall);
460 err = genlmsg_unicast(net, user_skb, upcall_info->portid);
467 /* Called with ovs_mutex. */
468 static int flush_flows(struct datapath *dp)
470 struct flow_table *old_table;
471 struct flow_table *new_table;
473 old_table = ovsl_dereference(dp->table);
474 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
478 rcu_assign_pointer(dp->table, new_table);
480 ovs_flow_tbl_destroy(old_table, true);
484 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa, int attr_len)
487 struct sw_flow_actions *acts;
489 int req_size = NLA_ALIGN(attr_len);
490 int next_offset = offsetof(struct sw_flow_actions, actions) +
493 if (req_size <= (ksize(*sfa) - next_offset))
496 new_acts_size = ksize(*sfa) * 2;
498 if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
499 if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
500 return ERR_PTR(-EMSGSIZE);
501 new_acts_size = MAX_ACTIONS_BUFSIZE;
504 acts = ovs_flow_actions_alloc(new_acts_size);
508 memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
509 acts->actions_len = (*sfa)->actions_len;
514 (*sfa)->actions_len += req_size;
515 return (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
518 static int add_action(struct sw_flow_actions **sfa, int attrtype, void *data, int len)
522 a = reserve_sfa_size(sfa, nla_attr_size(len));
526 a->nla_type = attrtype;
527 a->nla_len = nla_attr_size(len);
530 memcpy(nla_data(a), data, len);
531 memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
536 static inline int add_nested_action_start(struct sw_flow_actions **sfa, int attrtype)
538 int used = (*sfa)->actions_len;
541 err = add_action(sfa, attrtype, NULL, 0);
548 static inline void add_nested_action_end(struct sw_flow_actions *sfa, int st_offset)
550 struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions + st_offset);
552 a->nla_len = sfa->actions_len - st_offset;
555 static int validate_and_copy_actions(const struct nlattr *attr,
556 const struct sw_flow_key *key, int depth,
557 struct sw_flow_actions **sfa);
559 static int validate_and_copy_sample(const struct nlattr *attr,
560 const struct sw_flow_key *key, int depth,
561 struct sw_flow_actions **sfa)
563 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
564 const struct nlattr *probability, *actions;
565 const struct nlattr *a;
566 int rem, start, err, st_acts;
568 memset(attrs, 0, sizeof(attrs));
569 nla_for_each_nested(a, attr, rem) {
570 int type = nla_type(a);
571 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
578 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
579 if (!probability || nla_len(probability) != sizeof(u32))
582 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
583 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
586 /* validation done, copy sample action. */
587 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE);
590 err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY, nla_data(probability), sizeof(u32));
593 st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS);
597 err = validate_and_copy_actions(actions, key, depth + 1, sfa);
601 add_nested_action_end(*sfa, st_acts);
602 add_nested_action_end(*sfa, start);
607 static int validate_tp_port(const struct sw_flow_key *flow_key)
609 if (flow_key->eth.type == htons(ETH_P_IP)) {
610 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
612 } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
613 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
620 static int validate_and_copy_set_tun(const struct nlattr *attr,
621 struct sw_flow_actions **sfa)
623 struct sw_flow_match match;
624 struct sw_flow_key key;
627 ovs_match_init(&match, &key, NULL);
628 err = ovs_ipv4_tun_from_nlattr(nla_data(attr), &match, false);
632 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET);
636 err = add_action(sfa, OVS_KEY_ATTR_IPV4_TUNNEL, &match.key->tun_key,
637 sizeof(match.key->tun_key));
638 add_nested_action_end(*sfa, start);
643 static int validate_set(const struct nlattr *a,
644 const struct sw_flow_key *flow_key,
645 struct sw_flow_actions **sfa,
648 const struct nlattr *ovs_key = nla_data(a);
649 int key_type = nla_type(ovs_key);
651 /* There can be only one key in a action */
652 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
655 if (key_type > OVS_KEY_ATTR_MAX ||
656 (ovs_key_lens[key_type] != nla_len(ovs_key) &&
657 ovs_key_lens[key_type] != -1))
661 const struct ovs_key_ipv4 *ipv4_key;
662 const struct ovs_key_ipv6 *ipv6_key;
665 case OVS_KEY_ATTR_PRIORITY:
666 case OVS_KEY_ATTR_ETHERNET:
669 case OVS_KEY_ATTR_SKB_MARK:
670 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20) && !defined(CONFIG_NETFILTER)
671 if (nla_get_u32(ovs_key) != 0)
676 case OVS_KEY_ATTR_TUNNEL:
678 err = validate_and_copy_set_tun(a, sfa);
683 case OVS_KEY_ATTR_IPV4:
684 if (flow_key->eth.type != htons(ETH_P_IP))
687 if (!flow_key->ip.proto)
690 ipv4_key = nla_data(ovs_key);
691 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
694 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
699 case OVS_KEY_ATTR_IPV6:
700 if (flow_key->eth.type != htons(ETH_P_IPV6))
703 if (!flow_key->ip.proto)
706 ipv6_key = nla_data(ovs_key);
707 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
710 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
713 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
718 case OVS_KEY_ATTR_TCP:
719 if (flow_key->ip.proto != IPPROTO_TCP)
722 return validate_tp_port(flow_key);
724 case OVS_KEY_ATTR_UDP:
725 if (flow_key->ip.proto != IPPROTO_UDP)
728 return validate_tp_port(flow_key);
737 static int validate_userspace(const struct nlattr *attr)
739 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
740 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
741 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
743 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
746 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
747 attr, userspace_policy);
751 if (!a[OVS_USERSPACE_ATTR_PID] ||
752 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
758 static int copy_action(const struct nlattr *from,
759 struct sw_flow_actions **sfa)
761 int totlen = NLA_ALIGN(from->nla_len);
764 to = reserve_sfa_size(sfa, from->nla_len);
768 memcpy(to, from, totlen);
772 static int validate_and_copy_actions(const struct nlattr *attr,
773 const struct sw_flow_key *key,
775 struct sw_flow_actions **sfa)
777 const struct nlattr *a;
780 if (depth >= SAMPLE_ACTION_DEPTH)
783 nla_for_each_nested(a, attr, rem) {
784 /* Expected argument lengths, (u32)-1 for variable length. */
785 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
786 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
787 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
788 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
789 [OVS_ACTION_ATTR_POP_VLAN] = 0,
790 [OVS_ACTION_ATTR_SET] = (u32)-1,
791 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
793 const struct ovs_action_push_vlan *vlan;
794 int type = nla_type(a);
797 if (type > OVS_ACTION_ATTR_MAX ||
798 (action_lens[type] != nla_len(a) &&
799 action_lens[type] != (u32)-1))
804 case OVS_ACTION_ATTR_UNSPEC:
807 case OVS_ACTION_ATTR_USERSPACE:
808 err = validate_userspace(a);
813 case OVS_ACTION_ATTR_OUTPUT:
814 if (nla_get_u32(a) >= DP_MAX_PORTS)
819 case OVS_ACTION_ATTR_POP_VLAN:
822 case OVS_ACTION_ATTR_PUSH_VLAN:
824 if (vlan->vlan_tpid != htons(ETH_P_8021Q))
826 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
830 case OVS_ACTION_ATTR_SET:
831 err = validate_set(a, key, sfa, &skip_copy);
836 case OVS_ACTION_ATTR_SAMPLE:
837 err = validate_and_copy_sample(a, key, depth, sfa);
847 err = copy_action(a, sfa);
859 static void clear_stats(struct sw_flow *flow)
863 flow->packet_count = 0;
864 flow->byte_count = 0;
867 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
869 struct ovs_header *ovs_header = info->userhdr;
870 struct nlattr **a = info->attrs;
871 struct sw_flow_actions *acts;
872 struct sk_buff *packet;
873 struct sw_flow *flow;
880 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
881 !a[OVS_PACKET_ATTR_ACTIONS])
884 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
885 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
889 skb_reserve(packet, NET_IP_ALIGN);
891 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
893 skb_reset_mac_header(packet);
894 eth = eth_hdr(packet);
896 /* Normally, setting the skb 'protocol' field would be handled by a
897 * call to eth_type_trans(), but it assumes there's a sending
898 * device, which we may not have. */
899 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
900 packet->protocol = eth->h_proto;
902 packet->protocol = htons(ETH_P_802_2);
904 /* Build an sw_flow for sending this packet. */
905 flow = ovs_flow_alloc();
910 err = ovs_flow_extract(packet, -1, &flow->key);
914 err = ovs_flow_metadata_from_nlattrs(flow, a[OVS_PACKET_ATTR_KEY]);
917 acts = ovs_flow_actions_alloc(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
922 err = validate_and_copy_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0, &acts);
923 rcu_assign_pointer(flow->sf_acts, acts);
927 OVS_CB(packet)->flow = flow;
928 OVS_CB(packet)->pkt_key = &flow->key;
929 packet->priority = flow->key.phy.priority;
930 skb_set_mark(packet, flow->key.phy.skb_mark);
933 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
939 err = ovs_execute_actions(dp, packet);
943 ovs_flow_free(flow, false);
949 ovs_flow_free(flow, false);
956 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
957 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
958 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
960 [OVS_PACKET_ATTR_PACKET] = { .minlen = ETH_HLEN },
962 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
963 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
966 static struct genl_ops dp_packet_genl_ops[] = {
967 { .cmd = OVS_PACKET_CMD_EXECUTE,
968 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
969 .policy = packet_policy,
970 .doit = ovs_packet_cmd_execute
974 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
976 struct flow_table *table;
979 table = rcu_dereference_check(dp->table, lockdep_ovsl_is_held());
980 stats->n_flows = ovs_flow_tbl_count(table);
982 stats->n_hit = stats->n_missed = stats->n_lost = 0;
983 for_each_possible_cpu(i) {
984 const struct dp_stats_percpu *percpu_stats;
985 struct dp_stats_percpu local_stats;
988 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
991 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
992 local_stats = *percpu_stats;
993 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
995 stats->n_hit += local_stats.n_hit;
996 stats->n_missed += local_stats.n_missed;
997 stats->n_lost += local_stats.n_lost;
1001 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1002 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1003 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1004 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1007 static struct genl_family dp_flow_genl_family = {
1008 .id = GENL_ID_GENERATE,
1009 .hdrsize = sizeof(struct ovs_header),
1010 .name = OVS_FLOW_FAMILY,
1011 .version = OVS_FLOW_VERSION,
1012 .maxattr = OVS_FLOW_ATTR_MAX,
1017 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
1018 .name = OVS_FLOW_MCGROUP
1021 static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb);
1022 static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb)
1024 const struct nlattr *a;
1025 struct nlattr *start;
1028 start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
1032 nla_for_each_nested(a, attr, rem) {
1033 int type = nla_type(a);
1034 struct nlattr *st_sample;
1037 case OVS_SAMPLE_ATTR_PROBABILITY:
1038 if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY, sizeof(u32), nla_data(a)))
1041 case OVS_SAMPLE_ATTR_ACTIONS:
1042 st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
1045 err = actions_to_attr(nla_data(a), nla_len(a), skb);
1048 nla_nest_end(skb, st_sample);
1053 nla_nest_end(skb, start);
1057 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
1059 const struct nlattr *ovs_key = nla_data(a);
1060 int key_type = nla_type(ovs_key);
1061 struct nlattr *start;
1065 case OVS_KEY_ATTR_IPV4_TUNNEL:
1066 start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
1070 err = ovs_ipv4_tun_to_nlattr(skb, nla_data(ovs_key),
1074 nla_nest_end(skb, start);
1077 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
1085 static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb)
1087 const struct nlattr *a;
1090 nla_for_each_attr(a, attr, len, rem) {
1091 int type = nla_type(a);
1094 case OVS_ACTION_ATTR_SET:
1095 err = set_action_to_attr(a, skb);
1100 case OVS_ACTION_ATTR_SAMPLE:
1101 err = sample_action_to_attr(a, skb);
1106 if (nla_put(skb, type, nla_len(a), nla_data(a)))
1115 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
1117 return NLMSG_ALIGN(sizeof(struct ovs_header))
1118 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
1119 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
1120 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
1121 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
1122 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
1123 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
1126 /* Called with ovs_mutex. */
1127 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
1128 struct sk_buff *skb, u32 portid,
1129 u32 seq, u32 flags, u8 cmd)
1131 const int skb_orig_len = skb->len;
1132 struct nlattr *start;
1133 struct ovs_flow_stats stats;
1134 struct ovs_header *ovs_header;
1140 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
1144 ovs_header->dp_ifindex = get_dpifindex(dp);
1146 /* Fill flow key. */
1147 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
1149 goto nla_put_failure;
1151 err = ovs_flow_to_nlattrs(&flow->unmasked_key,
1152 &flow->unmasked_key, skb);
1155 nla_nest_end(skb, nla);
1157 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
1159 goto nla_put_failure;
1161 err = ovs_flow_to_nlattrs(&flow->key, &flow->mask->key, skb);
1165 nla_nest_end(skb, nla);
1167 spin_lock_bh(&flow->lock);
1169 stats.n_packets = flow->packet_count;
1170 stats.n_bytes = flow->byte_count;
1171 tcp_flags = flow->tcp_flags;
1172 spin_unlock_bh(&flow->lock);
1175 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
1176 goto nla_put_failure;
1178 if (stats.n_packets &&
1179 nla_put(skb, OVS_FLOW_ATTR_STATS,
1180 sizeof(struct ovs_flow_stats), &stats))
1181 goto nla_put_failure;
1184 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
1185 goto nla_put_failure;
1187 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
1188 * this is the first flow to be dumped into 'skb'. This is unusual for
1189 * Netlink but individual action lists can be longer than
1190 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
1191 * The userspace caller can always fetch the actions separately if it
1192 * really wants them. (Most userspace callers in fact don't care.)
1194 * This can only fail for dump operations because the skb is always
1195 * properly sized for single flows.
1197 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
1199 const struct sw_flow_actions *sf_acts;
1201 sf_acts = rcu_dereference_check(flow->sf_acts,
1202 lockdep_ovsl_is_held());
1204 err = actions_to_attr(sf_acts->actions, sf_acts->actions_len, skb);
1206 nla_nest_end(skb, start);
1211 nla_nest_cancel(skb, start);
1213 } else if (skb_orig_len)
1214 goto nla_put_failure;
1216 return genlmsg_end(skb, ovs_header);
1221 genlmsg_cancel(skb, ovs_header);
1225 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
1227 const struct sw_flow_actions *sf_acts;
1229 sf_acts = ovsl_dereference(flow->sf_acts);
1231 return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL);
1234 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
1235 struct datapath *dp,
1236 u32 portid, u32 seq, u8 cmd)
1238 struct sk_buff *skb;
1241 skb = ovs_flow_cmd_alloc_info(flow);
1243 return ERR_PTR(-ENOMEM);
1245 retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
1250 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
1252 struct nlattr **a = info->attrs;
1253 struct ovs_header *ovs_header = info->userhdr;
1254 struct sw_flow_key key, masked_key;
1255 struct sw_flow *flow = NULL;
1256 struct sw_flow_mask mask;
1257 struct sk_buff *reply;
1258 struct datapath *dp;
1259 struct flow_table *table;
1260 struct sw_flow_actions *acts = NULL;
1261 struct sw_flow_match match;
1266 if (!a[OVS_FLOW_ATTR_KEY])
1269 ovs_match_init(&match, &key, &mask);
1270 error = ovs_match_from_nlattrs(&match,
1271 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
1275 /* Validate actions. */
1276 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1277 acts = ovs_flow_actions_alloc(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
1278 error = PTR_ERR(acts);
1282 ovs_flow_key_mask(&masked_key, &key, &mask);
1283 error = validate_and_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
1284 &masked_key, 0, &acts);
1286 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
1289 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
1295 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1298 goto err_unlock_ovs;
1300 table = ovsl_dereference(dp->table);
1302 /* Check if this is a duplicate flow */
1303 flow = ovs_flow_lookup(table, &key);
1305 struct sw_flow_mask *mask_p;
1306 /* Bail out if we're not allowed to create a new flow. */
1308 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
1309 goto err_unlock_ovs;
1311 /* Expand table, if necessary, to make room. */
1312 if (ovs_flow_tbl_need_to_expand(table)) {
1313 struct flow_table *new_table;
1315 new_table = ovs_flow_tbl_expand(table);
1316 if (!IS_ERR(new_table)) {
1317 rcu_assign_pointer(dp->table, new_table);
1318 ovs_flow_tbl_destroy(table, true);
1319 table = ovsl_dereference(dp->table);
1323 /* Allocate flow. */
1324 flow = ovs_flow_alloc();
1326 error = PTR_ERR(flow);
1327 goto err_unlock_ovs;
1331 flow->key = masked_key;
1332 flow->unmasked_key = key;
1334 /* Make sure mask is unique in the system */
1335 mask_p = ovs_sw_flow_mask_find(table, &mask);
1337 /* Allocate a new mask if none exsits. */
1338 mask_p = ovs_sw_flow_mask_alloc();
1341 mask_p->key = mask.key;
1342 mask_p->range = mask.range;
1343 ovs_sw_flow_mask_insert(table, mask_p);
1346 ovs_sw_flow_mask_add_ref(mask_p);
1347 flow->mask = mask_p;
1348 rcu_assign_pointer(flow->sf_acts, acts);
1350 /* Put flow in bucket. */
1351 ovs_flow_insert(table, flow);
1353 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1354 info->snd_seq, OVS_FLOW_CMD_NEW);
1356 /* We found a matching flow. */
1357 struct sw_flow_actions *old_acts;
1359 /* Bail out if we're not allowed to modify an existing flow.
1360 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1361 * because Generic Netlink treats the latter as a dump
1362 * request. We also accept NLM_F_EXCL in case that bug ever
1366 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
1367 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1368 goto err_unlock_ovs;
1370 /* The unmasked key has to be the same for flow updates. */
1372 if (!ovs_flow_cmp_unmasked_key(flow, &key, match.range.end)) {
1373 OVS_NLERR("Flow modification message rejected, unmasked key does not match.\n");
1374 goto err_unlock_ovs;
1377 /* Update actions. */
1378 old_acts = ovsl_dereference(flow->sf_acts);
1379 rcu_assign_pointer(flow->sf_acts, acts);
1380 ovs_flow_deferred_free_acts(old_acts);
1382 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1383 info->snd_seq, OVS_FLOW_CMD_NEW);
1386 if (a[OVS_FLOW_ATTR_CLEAR]) {
1387 spin_lock_bh(&flow->lock);
1389 spin_unlock_bh(&flow->lock);
1395 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
1397 netlink_set_err(GENL_SOCK(sock_net(skb->sk)), 0,
1398 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1402 ovs_flow_free(flow, false);
1411 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1413 struct nlattr **a = info->attrs;
1414 struct ovs_header *ovs_header = info->userhdr;
1415 struct sw_flow_key key;
1416 struct sk_buff *reply;
1417 struct sw_flow *flow;
1418 struct datapath *dp;
1419 struct flow_table *table;
1420 struct sw_flow_match match;
1423 if (!a[OVS_FLOW_ATTR_KEY]) {
1424 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
1428 ovs_match_init(&match, &key, NULL);
1429 err = ovs_match_from_nlattrs(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1434 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1440 table = ovsl_dereference(dp->table);
1441 flow = ovs_flow_lookup_unmasked_key(table, &match);
1447 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1448 info->snd_seq, OVS_FLOW_CMD_NEW);
1449 if (IS_ERR(reply)) {
1450 err = PTR_ERR(reply);
1455 return genlmsg_reply(reply, info);
1461 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1463 struct nlattr **a = info->attrs;
1464 struct ovs_header *ovs_header = info->userhdr;
1465 struct sw_flow_key key;
1466 struct sk_buff *reply;
1467 struct sw_flow *flow;
1468 struct datapath *dp;
1469 struct flow_table *table;
1470 struct sw_flow_match match;
1474 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1480 if (!a[OVS_FLOW_ATTR_KEY]) {
1481 err = flush_flows(dp);
1485 ovs_match_init(&match, &key, NULL);
1486 err = ovs_match_from_nlattrs(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1490 table = ovsl_dereference(dp->table);
1491 flow = ovs_flow_lookup_unmasked_key(table, &match);
1497 reply = ovs_flow_cmd_alloc_info(flow);
1503 ovs_flow_remove(table, flow);
1505 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
1506 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1509 ovs_flow_free(flow, true);
1512 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
1519 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1521 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1522 struct datapath *dp;
1523 struct flow_table *table;
1526 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1532 table = rcu_dereference(dp->table);
1534 struct sw_flow *flow;
1537 bucket = cb->args[0];
1539 flow = ovs_flow_dump_next(table, &bucket, &obj);
1543 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1544 NETLINK_CB(cb->skb).portid,
1545 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1546 OVS_FLOW_CMD_NEW) < 0)
1549 cb->args[0] = bucket;
1556 static struct genl_ops dp_flow_genl_ops[] = {
1557 { .cmd = OVS_FLOW_CMD_NEW,
1558 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1559 .policy = flow_policy,
1560 .doit = ovs_flow_cmd_new_or_set
1562 { .cmd = OVS_FLOW_CMD_DEL,
1563 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1564 .policy = flow_policy,
1565 .doit = ovs_flow_cmd_del
1567 { .cmd = OVS_FLOW_CMD_GET,
1568 .flags = 0, /* OK for unprivileged users. */
1569 .policy = flow_policy,
1570 .doit = ovs_flow_cmd_get,
1571 .dumpit = ovs_flow_cmd_dump
1573 { .cmd = OVS_FLOW_CMD_SET,
1574 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1575 .policy = flow_policy,
1576 .doit = ovs_flow_cmd_new_or_set,
1580 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1581 #ifdef HAVE_NLA_NUL_STRING
1582 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1584 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1587 static struct genl_family dp_datapath_genl_family = {
1588 .id = GENL_ID_GENERATE,
1589 .hdrsize = sizeof(struct ovs_header),
1590 .name = OVS_DATAPATH_FAMILY,
1591 .version = OVS_DATAPATH_VERSION,
1592 .maxattr = OVS_DP_ATTR_MAX,
1597 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1598 .name = OVS_DATAPATH_MCGROUP
1601 static size_t ovs_dp_cmd_msg_size(void)
1603 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1605 msgsize += nla_total_size(IFNAMSIZ);
1606 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1611 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1612 u32 portid, u32 seq, u32 flags, u8 cmd)
1614 struct ovs_header *ovs_header;
1615 struct ovs_dp_stats dp_stats;
1618 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1623 ovs_header->dp_ifindex = get_dpifindex(dp);
1626 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1629 goto nla_put_failure;
1631 get_dp_stats(dp, &dp_stats);
1632 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1633 goto nla_put_failure;
1635 return genlmsg_end(skb, ovs_header);
1638 genlmsg_cancel(skb, ovs_header);
1643 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1646 struct sk_buff *skb;
1649 skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1651 return ERR_PTR(-ENOMEM);
1653 retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1656 return ERR_PTR(retval);
1661 static int ovs_dp_cmd_validate(struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1663 return CHECK_NUL_STRING(a[OVS_DP_ATTR_NAME], IFNAMSIZ - 1);
1666 /* Called with ovs_mutex. */
1667 static struct datapath *lookup_datapath(struct net *net,
1668 struct ovs_header *ovs_header,
1669 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1671 struct datapath *dp;
1673 if (!a[OVS_DP_ATTR_NAME])
1674 dp = get_dp(net, ovs_header->dp_ifindex);
1676 struct vport *vport;
1679 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1680 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1683 return dp ? dp : ERR_PTR(-ENODEV);
1686 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1688 struct nlattr **a = info->attrs;
1689 struct vport_parms parms;
1690 struct sk_buff *reply;
1691 struct datapath *dp;
1692 struct vport *vport;
1693 struct ovs_net *ovs_net;
1697 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1700 err = ovs_dp_cmd_validate(a);
1707 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1709 goto err_unlock_ovs;
1711 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1713 /* Allocate table. */
1715 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1719 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1720 if (!dp->stats_percpu) {
1722 goto err_destroy_table;
1725 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1729 goto err_destroy_percpu;
1732 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1733 INIT_HLIST_HEAD(&dp->ports[i]);
1735 /* Set up our datapath device. */
1736 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1737 parms.type = OVS_VPORT_TYPE_INTERNAL;
1738 parms.options = NULL;
1740 parms.port_no = OVSP_LOCAL;
1741 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1743 vport = new_vport(&parms);
1744 if (IS_ERR(vport)) {
1745 err = PTR_ERR(vport);
1749 goto err_destroy_ports_array;
1752 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1753 info->snd_seq, OVS_DP_CMD_NEW);
1754 err = PTR_ERR(reply);
1756 goto err_destroy_local_port;
1758 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1759 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1763 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1766 err_destroy_local_port:
1767 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1768 err_destroy_ports_array:
1771 free_percpu(dp->stats_percpu);
1773 ovs_flow_tbl_destroy(ovsl_dereference(dp->table), false);
1775 release_net(ovs_dp_get_net(dp));
1783 /* Called with ovs_mutex. */
1784 static void __dp_destroy(struct datapath *dp)
1788 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1789 struct vport *vport;
1790 struct hlist_node *n;
1792 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1793 if (vport->port_no != OVSP_LOCAL)
1794 ovs_dp_detach_port(vport);
1797 list_del_rcu(&dp->list_node);
1799 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1800 * all port in datapath are destroyed first before freeing datapath.
1802 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1804 call_rcu(&dp->rcu, destroy_dp_rcu);
1807 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1809 struct sk_buff *reply;
1810 struct datapath *dp;
1813 err = ovs_dp_cmd_validate(info->attrs);
1818 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1823 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1824 info->snd_seq, OVS_DP_CMD_DEL);
1825 err = PTR_ERR(reply);
1832 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1840 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1842 struct sk_buff *reply;
1843 struct datapath *dp;
1846 err = ovs_dp_cmd_validate(info->attrs);
1851 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1856 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1857 info->snd_seq, OVS_DP_CMD_NEW);
1858 if (IS_ERR(reply)) {
1859 err = PTR_ERR(reply);
1860 netlink_set_err(GENL_SOCK(sock_net(skb->sk)), 0,
1861 ovs_dp_datapath_multicast_group.id, err);
1867 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1875 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1877 struct sk_buff *reply;
1878 struct datapath *dp;
1881 err = ovs_dp_cmd_validate(info->attrs);
1886 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1892 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1893 info->snd_seq, OVS_DP_CMD_NEW);
1894 if (IS_ERR(reply)) {
1895 err = PTR_ERR(reply);
1900 return genlmsg_reply(reply, info);
1907 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1909 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1910 struct datapath *dp;
1911 int skip = cb->args[0];
1915 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1917 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1918 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1919 OVS_DP_CMD_NEW) < 0)
1930 static struct genl_ops dp_datapath_genl_ops[] = {
1931 { .cmd = OVS_DP_CMD_NEW,
1932 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1933 .policy = datapath_policy,
1934 .doit = ovs_dp_cmd_new
1936 { .cmd = OVS_DP_CMD_DEL,
1937 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1938 .policy = datapath_policy,
1939 .doit = ovs_dp_cmd_del
1941 { .cmd = OVS_DP_CMD_GET,
1942 .flags = 0, /* OK for unprivileged users. */
1943 .policy = datapath_policy,
1944 .doit = ovs_dp_cmd_get,
1945 .dumpit = ovs_dp_cmd_dump
1947 { .cmd = OVS_DP_CMD_SET,
1948 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1949 .policy = datapath_policy,
1950 .doit = ovs_dp_cmd_set,
1954 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1955 #ifdef HAVE_NLA_NUL_STRING
1956 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1957 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1959 [OVS_VPORT_ATTR_STATS] = { .minlen = sizeof(struct ovs_vport_stats) },
1961 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1962 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1963 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1964 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1967 static struct genl_family dp_vport_genl_family = {
1968 .id = GENL_ID_GENERATE,
1969 .hdrsize = sizeof(struct ovs_header),
1970 .name = OVS_VPORT_FAMILY,
1971 .version = OVS_VPORT_VERSION,
1972 .maxattr = OVS_VPORT_ATTR_MAX,
1977 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1978 .name = OVS_VPORT_MCGROUP
1981 /* Called with ovs_mutex or RCU read lock. */
1982 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1983 u32 portid, u32 seq, u32 flags, u8 cmd)
1985 struct ovs_header *ovs_header;
1986 struct ovs_vport_stats vport_stats;
1989 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1994 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1996 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1997 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1998 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1999 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
2000 goto nla_put_failure;
2002 ovs_vport_get_stats(vport, &vport_stats);
2003 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
2005 goto nla_put_failure;
2007 err = ovs_vport_get_options(vport, skb);
2008 if (err == -EMSGSIZE)
2011 return genlmsg_end(skb, ovs_header);
2016 genlmsg_cancel(skb, ovs_header);
2020 /* Called with ovs_mutex or RCU read lock. */
2021 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
2024 struct sk_buff *skb;
2027 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2029 return ERR_PTR(-ENOMEM);
2031 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
2037 static int ovs_vport_cmd_validate(struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2039 return CHECK_NUL_STRING(a[OVS_VPORT_ATTR_NAME], IFNAMSIZ - 1);
2042 /* Called with ovs_mutex or RCU read lock. */
2043 static struct vport *lookup_vport(struct net *net,
2044 struct ovs_header *ovs_header,
2045 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2047 struct datapath *dp;
2048 struct vport *vport;
2050 if (a[OVS_VPORT_ATTR_NAME]) {
2051 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2053 return ERR_PTR(-ENODEV);
2054 if (ovs_header->dp_ifindex &&
2055 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2056 return ERR_PTR(-ENODEV);
2058 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2059 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2061 if (port_no >= DP_MAX_PORTS)
2062 return ERR_PTR(-EFBIG);
2064 dp = get_dp(net, ovs_header->dp_ifindex);
2066 return ERR_PTR(-ENODEV);
2068 vport = ovs_vport_ovsl_rcu(dp, port_no);
2070 return ERR_PTR(-ENODEV);
2073 return ERR_PTR(-EINVAL);
2076 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2078 struct nlattr **a = info->attrs;
2079 struct ovs_header *ovs_header = info->userhdr;
2080 struct vport_parms parms;
2081 struct sk_buff *reply;
2082 struct vport *vport;
2083 struct datapath *dp;
2088 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2089 !a[OVS_VPORT_ATTR_UPCALL_PID])
2092 err = ovs_vport_cmd_validate(a);
2097 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2102 if (a[OVS_VPORT_ATTR_PORT_NO]) {
2103 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2106 if (port_no >= DP_MAX_PORTS)
2109 vport = ovs_vport_ovsl(dp, port_no);
2114 for (port_no = 1; ; port_no++) {
2115 if (port_no >= DP_MAX_PORTS) {
2119 vport = ovs_vport_ovsl(dp, port_no);
2125 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2126 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2127 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2129 parms.port_no = port_no;
2130 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
2132 vport = new_vport(&parms);
2133 err = PTR_ERR(vport);
2138 if (a[OVS_VPORT_ATTR_STATS])
2139 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
2141 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
2143 if (IS_ERR(reply)) {
2144 err = PTR_ERR(reply);
2145 ovs_dp_detach_port(vport);
2149 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2157 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2159 struct nlattr **a = info->attrs;
2160 struct sk_buff *reply;
2161 struct vport *vport;
2164 err = ovs_vport_cmd_validate(a);
2169 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2170 err = PTR_ERR(vport);
2174 if (a[OVS_VPORT_ATTR_TYPE] &&
2175 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2180 reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2186 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2187 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2192 if (a[OVS_VPORT_ATTR_STATS])
2193 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
2195 if (a[OVS_VPORT_ATTR_UPCALL_PID])
2196 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
2198 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2199 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2203 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2214 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2216 struct nlattr **a = info->attrs;
2217 struct sk_buff *reply;
2218 struct vport *vport;
2221 err = ovs_vport_cmd_validate(a);
2226 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2227 err = PTR_ERR(vport);
2231 if (vport->port_no == OVSP_LOCAL) {
2236 reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
2237 info->snd_seq, OVS_VPORT_CMD_DEL);
2238 err = PTR_ERR(reply);
2243 ovs_dp_detach_port(vport);
2245 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2253 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2255 struct nlattr **a = info->attrs;
2256 struct ovs_header *ovs_header = info->userhdr;
2257 struct sk_buff *reply;
2258 struct vport *vport;
2261 err = ovs_vport_cmd_validate(a);
2266 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2267 err = PTR_ERR(vport);
2271 reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
2272 info->snd_seq, OVS_VPORT_CMD_NEW);
2273 err = PTR_ERR(reply);
2279 return genlmsg_reply(reply, info);
2287 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2289 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2290 struct datapath *dp;
2291 int bucket = cb->args[0], skip = cb->args[1];
2294 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2299 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2300 struct vport *vport;
2303 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2305 ovs_vport_cmd_fill_info(vport, skb,
2306 NETLINK_CB(cb->skb).portid,
2309 OVS_VPORT_CMD_NEW) < 0)
2325 static struct genl_ops dp_vport_genl_ops[] = {
2326 { .cmd = OVS_VPORT_CMD_NEW,
2327 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2328 .policy = vport_policy,
2329 .doit = ovs_vport_cmd_new
2331 { .cmd = OVS_VPORT_CMD_DEL,
2332 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2333 .policy = vport_policy,
2334 .doit = ovs_vport_cmd_del
2336 { .cmd = OVS_VPORT_CMD_GET,
2337 .flags = 0, /* OK for unprivileged users. */
2338 .policy = vport_policy,
2339 .doit = ovs_vport_cmd_get,
2340 .dumpit = ovs_vport_cmd_dump
2342 { .cmd = OVS_VPORT_CMD_SET,
2343 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2344 .policy = vport_policy,
2345 .doit = ovs_vport_cmd_set,
2349 struct genl_family_and_ops {
2350 struct genl_family *family;
2351 struct genl_ops *ops;
2353 struct genl_multicast_group *group;
2356 static const struct genl_family_and_ops dp_genl_families[] = {
2357 { &dp_datapath_genl_family,
2358 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
2359 &ovs_dp_datapath_multicast_group },
2360 { &dp_vport_genl_family,
2361 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
2362 &ovs_dp_vport_multicast_group },
2363 { &dp_flow_genl_family,
2364 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
2365 &ovs_dp_flow_multicast_group },
2366 { &dp_packet_genl_family,
2367 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
2371 static void dp_unregister_genl(int n_families)
2375 for (i = 0; i < n_families; i++)
2376 genl_unregister_family(dp_genl_families[i].family);
2379 static int dp_register_genl(void)
2386 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2387 const struct genl_family_and_ops *f = &dp_genl_families[i];
2389 err = genl_register_family_with_ops(f->family, f->ops,
2396 err = genl_register_mc_group(f->family, f->group);
2405 dp_unregister_genl(n_registered);
2409 static void rehash_flow_table(struct work_struct *work)
2411 struct datapath *dp;
2417 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2419 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2420 struct flow_table *old_table = ovsl_dereference(dp->table);
2421 struct flow_table *new_table;
2423 new_table = ovs_flow_tbl_rehash(old_table);
2424 if (!IS_ERR(new_table)) {
2425 rcu_assign_pointer(dp->table, new_table);
2426 ovs_flow_tbl_destroy(old_table, true);
2432 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2435 static int __net_init ovs_init_net(struct net *net)
2437 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2439 INIT_LIST_HEAD(&ovs_net->dps);
2440 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2444 static void __net_exit ovs_exit_net(struct net *net)
2446 struct datapath *dp, *dp_next;
2447 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2450 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2454 cancel_work_sync(&ovs_net->dp_notify_work);
2457 static struct pernet_operations ovs_net_ops = {
2458 .init = ovs_init_net,
2459 .exit = ovs_exit_net,
2461 .size = sizeof(struct ovs_net),
2464 DEFINE_COMPAT_PNET_REG_FUNC(device);
2466 static int __init dp_init(void)
2470 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2472 pr_info("Open vSwitch switching datapath %s, built "__DATE__" "__TIME__"\n",
2475 err = ovs_workqueues_init();
2479 err = ovs_flow_init();
2483 err = ovs_vport_init();
2485 goto error_flow_exit;
2487 err = register_pernet_device(&ovs_net_ops);
2489 goto error_vport_exit;
2491 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2493 goto error_netns_exit;
2495 err = dp_register_genl();
2497 goto error_unreg_notifier;
2499 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2503 error_unreg_notifier:
2504 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2506 unregister_pernet_device(&ovs_net_ops);
2512 ovs_workqueues_exit();
2517 static void dp_cleanup(void)
2519 cancel_delayed_work_sync(&rehash_flow_wq);
2520 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2521 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2522 unregister_pernet_device(&ovs_net_ops);
2526 ovs_workqueues_exit();
2529 module_init(dp_init);
2530 module_exit(dp_cleanup);
2532 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2533 MODULE_LICENSE("GPL");
2534 MODULE_VERSION(VERSION);