2 * Copyright (c) 2007-2014 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/ethtool.h>
40 #include <linux/wait.h>
41 #include <asm/div64.h>
42 #include <linux/highmem.h>
43 #include <linux/netfilter_bridge.h>
44 #include <linux/netfilter_ipv4.h>
45 #include <linux/inetdevice.h>
46 #include <linux/list.h>
47 #include <linux/openvswitch.h>
48 #include <linux/rculist.h>
49 #include <linux/dmi.h>
50 #include <net/genetlink.h>
51 #include <net/net_namespace.h>
52 #include <net/netns/generic.h>
56 #include "flow_table.h"
57 #include "flow_netlink.h"
58 #include "vport-internal_dev.h"
59 #include "vport-netdev.h"
61 int ovs_net_id __read_mostly;
62 EXPORT_SYMBOL_GPL(ovs_net_id);
64 static struct genl_family dp_packet_genl_family;
65 static struct genl_family dp_flow_genl_family;
66 static struct genl_family dp_datapath_genl_family;
68 static const struct nla_policy flow_policy[];
70 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
71 .name = OVS_FLOW_MCGROUP,
74 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
75 .name = OVS_DATAPATH_MCGROUP,
78 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
79 .name = OVS_VPORT_MCGROUP,
82 /* Check if need to build a reply message.
83 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
84 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
87 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
88 genl_has_listeners(family, genl_info_net(info), group);
91 static void ovs_notify(struct genl_family *family,
92 struct sk_buff *skb, struct genl_info *info)
94 genl_notify(family, skb, info, 0, GFP_KERNEL);
100 * All writes e.g. Writes to device state (add/remove datapath, port, set
101 * operations on vports, etc.), Writes to other state (flow table
102 * modifications, set miscellaneous datapath parameters, etc.) are protected
105 * Reads are protected by RCU.
107 * There are a few special cases (mostly stats) that have their own
108 * synchronization but they nest under all of above and don't interact with
111 * The RTNL lock nests inside ovs_mutex.
114 static DEFINE_MUTEX(ovs_mutex);
118 mutex_lock(&ovs_mutex);
121 void ovs_unlock(void)
123 mutex_unlock(&ovs_mutex);
126 #ifdef CONFIG_LOCKDEP
127 int lockdep_ovsl_is_held(void)
130 return lockdep_is_held(&ovs_mutex);
134 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held);
137 static struct vport *new_vport(const struct vport_parms *);
138 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
139 const struct sw_flow_key *,
140 const struct dp_upcall_info *,
142 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
143 const struct sw_flow_key *,
144 const struct dp_upcall_info *,
147 /* Must be called with rcu_read_lock. */
148 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
150 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
153 struct vport *vport = ovs_internal_dev_get_vport(dev);
161 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
162 * returned dp pointer valid.
164 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
168 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
170 dp = get_dp_rcu(net, dp_ifindex);
176 /* Must be called with rcu_read_lock or ovs_mutex. */
177 const char *ovs_dp_name(const struct datapath *dp)
179 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
180 return ovs_vport_name(vport);
183 static int get_dpifindex(const struct datapath *dp)
190 local = ovs_vport_rcu(dp, OVSP_LOCAL);
192 ifindex = local->dev->ifindex;
201 static void destroy_dp_rcu(struct rcu_head *rcu)
203 struct datapath *dp = container_of(rcu, struct datapath, rcu);
205 ovs_flow_tbl_destroy(&dp->table);
206 free_percpu(dp->stats_percpu);
211 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
214 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
217 /* Called with ovs_mutex or RCU read lock. */
218 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
221 struct hlist_head *head;
223 head = vport_hash_bucket(dp, port_no);
224 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
225 if (vport->port_no == port_no)
231 /* Called with ovs_mutex. */
232 static struct vport *new_vport(const struct vport_parms *parms)
236 vport = ovs_vport_add(parms);
237 if (!IS_ERR(vport)) {
238 struct datapath *dp = parms->dp;
239 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
241 hlist_add_head_rcu(&vport->dp_hash_node, head);
246 void ovs_dp_detach_port(struct vport *p)
250 /* First drop references to device. */
251 hlist_del_rcu(&p->dp_hash_node);
253 /* Then destroy it. */
257 /* Must be called with rcu_read_lock. */
258 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
260 const struct vport *p = OVS_CB(skb)->input_vport;
261 struct datapath *dp = p->dp;
262 struct sw_flow *flow;
263 struct sw_flow_actions *sf_acts;
264 struct dp_stats_percpu *stats;
268 stats = this_cpu_ptr(dp->stats_percpu);
271 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
272 if (unlikely(!flow)) {
273 struct dp_upcall_info upcall;
276 memset(&upcall, 0, sizeof(upcall));
277 upcall.cmd = OVS_PACKET_CMD_MISS;
278 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
279 upcall.mru = OVS_CB(skb)->mru;
280 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
292 stats_counter = &stats->n_missed;
296 ovs_flow_stats_update(flow, key->tp.flags, skb);
297 sf_acts = rcu_dereference(flow->sf_acts);
298 ovs_execute_actions(dp, skb, sf_acts, key);
300 stats_counter = &stats->n_hit;
303 /* Update datapath statistics. */
304 u64_stats_update_begin(&stats->syncp);
306 stats->n_mask_hit += n_mask_hit;
307 u64_stats_update_end(&stats->syncp);
310 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
311 const struct sw_flow_key *key,
312 const struct dp_upcall_info *upcall_info,
315 struct dp_stats_percpu *stats;
318 if (upcall_info->portid == 0) {
323 if (!skb_is_gso(skb))
324 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
326 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
333 stats = this_cpu_ptr(dp->stats_percpu);
335 u64_stats_update_begin(&stats->syncp);
337 u64_stats_update_end(&stats->syncp);
342 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
343 const struct sw_flow_key *key,
344 const struct dp_upcall_info *upcall_info,
347 unsigned short gso_type = skb_shinfo(skb)->gso_type;
348 struct sw_flow_key later_key;
349 struct sk_buff *segs, *nskb;
352 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
353 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
355 return PTR_ERR(segs);
359 if (gso_type & SKB_GSO_UDP) {
360 /* The initial flow key extracted by ovs_flow_key_extract()
361 * in this case is for a first fragment, so we need to
362 * properly mark later fragments.
365 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
368 /* Queue all of the segments. */
371 if (gso_type & SKB_GSO_UDP && skb != segs)
374 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
378 } while ((skb = skb->next));
380 /* Free all of the segments. */
388 } while ((skb = nskb));
392 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
393 unsigned int hdrlen, int actions_attrlen)
395 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
396 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
397 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
398 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
400 /* OVS_PACKET_ATTR_USERDATA */
401 if (upcall_info->userdata)
402 size += NLA_ALIGN(upcall_info->userdata->nla_len);
404 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
405 if (upcall_info->egress_tun_info)
406 size += nla_total_size(ovs_tun_key_attr_size());
408 /* OVS_PACKET_ATTR_ACTIONS */
409 if (upcall_info->actions_len)
410 size += nla_total_size(actions_attrlen);
412 /* OVS_PACKET_ATTR_MRU */
413 if (upcall_info->mru)
414 size += nla_total_size(sizeof(upcall_info->mru));
419 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
421 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
422 size_t plen = NLA_ALIGN(skb->len) - skb->len;
425 memset(skb_put(skb, plen), 0, plen);
429 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
430 const struct sw_flow_key *key,
431 const struct dp_upcall_info *upcall_info,
434 struct ovs_header *upcall;
435 struct sk_buff *nskb = NULL;
436 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
442 dp_ifindex = get_dpifindex(dp);
446 if (skb_vlan_tag_present(skb)) {
447 nskb = skb_clone(skb, GFP_ATOMIC);
451 nskb = __vlan_hwaccel_push_inside(nskb);
458 if (nla_attr_size(skb->len) > USHRT_MAX) {
463 /* Complete checksum if needed */
464 if (skb->ip_summed == CHECKSUM_PARTIAL &&
465 (err = skb_checksum_help(skb)))
468 /* Older versions of OVS user space enforce alignment of the last
469 * Netlink attribute to NLA_ALIGNTO which would require extensive
470 * padding logic. Only perform zerocopy if padding is not required.
472 if (dp->user_features & OVS_DP_F_UNALIGNED)
473 hlen = skb_zerocopy_headlen(skb);
477 len = upcall_msg_size(upcall_info, hlen - cutlen,
478 OVS_CB(skb)->acts_origlen);
479 user_skb = genlmsg_new(len, GFP_ATOMIC);
485 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
486 0, upcall_info->cmd);
487 upcall->dp_ifindex = dp_ifindex;
489 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
492 if (upcall_info->userdata)
493 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
494 nla_len(upcall_info->userdata),
495 nla_data(upcall_info->userdata));
497 if (upcall_info->egress_tun_info) {
498 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
499 err = ovs_nla_put_tunnel_info(user_skb,
500 upcall_info->egress_tun_info);
502 nla_nest_end(user_skb, nla);
505 if (upcall_info->actions_len) {
506 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
507 err = ovs_nla_put_actions(upcall_info->actions,
508 upcall_info->actions_len,
511 nla_nest_end(user_skb, nla);
513 nla_nest_cancel(user_skb, nla);
516 /* Add OVS_PACKET_ATTR_MRU */
517 if (upcall_info->mru) {
518 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
523 pad_packet(dp, user_skb);
526 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
528 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
533 pad_packet(dp, user_skb);
536 /* Only reserve room for attribute header, packet data is added
537 * in skb_zerocopy() */
538 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
542 nla->nla_len = nla_attr_size(skb->len - cutlen);
544 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
548 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
549 pad_packet(dp, user_skb);
551 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
553 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
558 consume_skb(user_skb);
564 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
566 struct ovs_header *ovs_header = info->userhdr;
567 struct net *net = sock_net(skb->sk);
568 struct nlattr **a = info->attrs;
569 struct sw_flow_actions *acts;
570 struct sk_buff *packet;
571 struct sw_flow *flow;
572 struct sw_flow_actions *sf_acts;
575 struct vport *input_vport;
579 bool log = !a[OVS_PACKET_ATTR_PROBE];
582 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
583 !a[OVS_PACKET_ATTR_ACTIONS])
586 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
587 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
591 skb_reserve(packet, NET_IP_ALIGN);
593 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
595 skb_reset_mac_header(packet);
596 eth = eth_hdr(packet);
598 /* Normally, setting the skb 'protocol' field would be handled by a
599 * call to eth_type_trans(), but it assumes there's a sending
600 * device, which we may not have. */
601 if (eth_proto_is_802_3(eth->h_proto))
602 packet->protocol = eth->h_proto;
604 packet->protocol = htons(ETH_P_802_2);
606 /* Set packet's mru */
607 if (a[OVS_PACKET_ATTR_MRU]) {
608 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
609 packet->ignore_df = 1;
611 OVS_CB(packet)->mru = mru;
613 /* Build an sw_flow for sending this packet. */
614 flow = ovs_flow_alloc();
619 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
620 packet, &flow->key, log);
624 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
625 &flow->key, &acts, log);
629 rcu_assign_pointer(flow->sf_acts, acts);
630 packet->priority = flow->key.phy.priority;
631 packet->mark = flow->key.phy.skb_mark;
634 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
639 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
641 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
646 packet->dev = input_vport->dev;
647 OVS_CB(packet)->input_vport = input_vport;
648 sf_acts = rcu_dereference(flow->sf_acts);
651 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
655 ovs_flow_free(flow, false);
661 ovs_flow_free(flow, false);
668 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
669 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
670 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
671 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
672 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
673 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
676 static const struct genl_ops dp_packet_genl_ops[] = {
677 { .cmd = OVS_PACKET_CMD_EXECUTE,
678 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
679 .policy = packet_policy,
680 .doit = ovs_packet_cmd_execute
684 static struct genl_family dp_packet_genl_family = {
685 .id = GENL_ID_GENERATE,
686 .hdrsize = sizeof(struct ovs_header),
687 .name = OVS_PACKET_FAMILY,
688 .version = OVS_PACKET_VERSION,
689 .maxattr = OVS_PACKET_ATTR_MAX,
691 .parallel_ops = true,
692 .ops = dp_packet_genl_ops,
693 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
696 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
697 struct ovs_dp_megaflow_stats *mega_stats)
701 memset(mega_stats, 0, sizeof(*mega_stats));
703 stats->n_flows = ovs_flow_tbl_count(&dp->table);
704 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
706 stats->n_hit = stats->n_missed = stats->n_lost = 0;
708 for_each_possible_cpu(i) {
709 const struct dp_stats_percpu *percpu_stats;
710 struct dp_stats_percpu local_stats;
713 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
716 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
717 local_stats = *percpu_stats;
718 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
720 stats->n_hit += local_stats.n_hit;
721 stats->n_missed += local_stats.n_missed;
722 stats->n_lost += local_stats.n_lost;
723 mega_stats->n_mask_hit += local_stats.n_mask_hit;
727 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
729 return ovs_identifier_is_ufid(sfid) &&
730 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
733 static bool should_fill_mask(uint32_t ufid_flags)
735 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
738 static bool should_fill_actions(uint32_t ufid_flags)
740 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
743 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
744 const struct sw_flow_id *sfid,
747 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
749 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
750 * see ovs_nla_put_identifier()
752 if (sfid && ovs_identifier_is_ufid(sfid))
753 len += nla_total_size(sfid->ufid_len);
755 len += nla_total_size(ovs_key_attr_size());
757 /* OVS_FLOW_ATTR_KEY */
758 if (!sfid || should_fill_key(sfid, ufid_flags))
759 len += nla_total_size(ovs_key_attr_size());
761 /* OVS_FLOW_ATTR_MASK */
762 if (should_fill_mask(ufid_flags))
763 len += nla_total_size(ovs_key_attr_size());
765 /* OVS_FLOW_ATTR_ACTIONS */
766 if (should_fill_actions(ufid_flags))
767 len += nla_total_size(acts->orig_len);
770 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
771 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
772 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
775 /* Called with ovs_mutex or RCU read lock. */
776 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
779 struct ovs_flow_stats stats;
783 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
786 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
790 if (stats.n_packets &&
791 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
792 sizeof(struct ovs_flow_stats), &stats,
796 if ((u8)ntohs(tcp_flags) &&
797 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
803 /* Called with ovs_mutex or RCU read lock. */
804 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
805 struct sk_buff *skb, int skb_orig_len)
807 struct nlattr *start;
810 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
811 * this is the first flow to be dumped into 'skb'. This is unusual for
812 * Netlink but individual action lists can be longer than
813 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
814 * The userspace caller can always fetch the actions separately if it
815 * really wants them. (Most userspace callers in fact don't care.)
817 * This can only fail for dump operations because the skb is always
818 * properly sized for single flows.
820 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
822 const struct sw_flow_actions *sf_acts;
824 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
825 err = ovs_nla_put_actions(sf_acts->actions,
826 sf_acts->actions_len, skb);
829 nla_nest_end(skb, start);
834 nla_nest_cancel(skb, start);
836 } else if (skb_orig_len) {
843 /* Called with ovs_mutex or RCU read lock. */
844 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
845 struct sk_buff *skb, u32 portid,
846 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
848 const int skb_orig_len = skb->len;
849 struct ovs_header *ovs_header;
852 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
857 ovs_header->dp_ifindex = dp_ifindex;
859 err = ovs_nla_put_identifier(flow, skb);
863 if (should_fill_key(&flow->id, ufid_flags)) {
864 err = ovs_nla_put_masked_key(flow, skb);
869 if (should_fill_mask(ufid_flags)) {
870 err = ovs_nla_put_mask(flow, skb);
875 err = ovs_flow_cmd_fill_stats(flow, skb);
879 if (should_fill_actions(ufid_flags)) {
880 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
885 genlmsg_end(skb, ovs_header);
889 genlmsg_cancel(skb, ovs_header);
893 /* May not be called with RCU read lock. */
894 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
895 const struct sw_flow_id *sfid,
896 struct genl_info *info,
903 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
906 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
907 skb = genlmsg_new(len, GFP_KERNEL);
909 return ERR_PTR(-ENOMEM);
914 /* Called with ovs_mutex. */
915 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
917 struct genl_info *info, u8 cmd,
918 bool always, u32 ufid_flags)
923 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
924 &flow->id, info, always, ufid_flags);
925 if (IS_ERR_OR_NULL(skb))
928 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
929 info->snd_portid, info->snd_seq, 0,
931 if (WARN_ON_ONCE(retval < 0)) {
933 skb = ERR_PTR(retval);
938 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
940 struct net *net = sock_net(skb->sk);
941 struct nlattr **a = info->attrs;
942 struct ovs_header *ovs_header = info->userhdr;
943 struct sw_flow *flow = NULL, *new_flow;
944 struct sw_flow_mask mask;
945 struct sk_buff *reply;
947 struct sw_flow_actions *acts;
948 struct sw_flow_match match;
949 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
951 bool log = !a[OVS_FLOW_ATTR_PROBE];
953 /* Must have key and actions. */
955 if (!a[OVS_FLOW_ATTR_KEY]) {
956 OVS_NLERR(log, "Flow key attr not present in new flow.");
959 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
960 OVS_NLERR(log, "Flow actions attr not present in new flow.");
964 /* Most of the time we need to allocate a new flow, do it before
967 new_flow = ovs_flow_alloc();
968 if (IS_ERR(new_flow)) {
969 error = PTR_ERR(new_flow);
974 ovs_match_init(&match, &new_flow->key, false, &mask);
975 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
976 a[OVS_FLOW_ATTR_MASK], log);
980 /* Extract flow identifier. */
981 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
982 &new_flow->key, log);
986 /* unmasked key is needed to match when ufid is not used. */
987 if (ovs_identifier_is_key(&new_flow->id))
988 match.key = new_flow->id.unmasked_key;
990 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
992 /* Validate actions. */
993 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
994 &new_flow->key, &acts, log);
996 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
1000 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
1002 if (IS_ERR(reply)) {
1003 error = PTR_ERR(reply);
1004 goto err_kfree_acts;
1008 dp = get_dp(net, ovs_header->dp_ifindex);
1009 if (unlikely(!dp)) {
1011 goto err_unlock_ovs;
1014 /* Check if this is a duplicate flow */
1015 if (ovs_identifier_is_ufid(&new_flow->id))
1016 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
1018 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
1019 if (likely(!flow)) {
1020 rcu_assign_pointer(new_flow->sf_acts, acts);
1022 /* Put flow in bucket. */
1023 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1024 if (unlikely(error)) {
1026 goto err_unlock_ovs;
1029 if (unlikely(reply)) {
1030 error = ovs_flow_cmd_fill_info(new_flow,
1031 ovs_header->dp_ifindex,
1032 reply, info->snd_portid,
1040 struct sw_flow_actions *old_acts;
1042 /* Bail out if we're not allowed to modify an existing flow.
1043 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1044 * because Generic Netlink treats the latter as a dump
1045 * request. We also accept NLM_F_EXCL in case that bug ever
1048 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1051 goto err_unlock_ovs;
1053 /* The flow identifier has to be the same for flow updates.
1054 * Look for any overlapping flow.
1056 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1057 if (ovs_identifier_is_key(&flow->id))
1058 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1060 else /* UFID matches but key is different */
1064 goto err_unlock_ovs;
1067 /* Update actions. */
1068 old_acts = ovsl_dereference(flow->sf_acts);
1069 rcu_assign_pointer(flow->sf_acts, acts);
1071 if (unlikely(reply)) {
1072 error = ovs_flow_cmd_fill_info(flow,
1073 ovs_header->dp_ifindex,
1074 reply, info->snd_portid,
1082 ovs_nla_free_flow_actions_rcu(old_acts);
1083 ovs_flow_free(new_flow, false);
1087 ovs_notify(&dp_flow_genl_family, reply, info);
1094 ovs_nla_free_flow_actions(acts);
1096 ovs_flow_free(new_flow, false);
1101 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1102 static struct sw_flow_actions *get_flow_actions(struct net *net,
1103 const struct nlattr *a,
1104 const struct sw_flow_key *key,
1105 const struct sw_flow_mask *mask,
1108 struct sw_flow_actions *acts;
1109 struct sw_flow_key masked_key;
1112 ovs_flow_mask_key(&masked_key, key, true, mask);
1113 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1116 "Actions may not be safe on all matching packets");
1117 return ERR_PTR(error);
1123 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1125 struct net *net = sock_net(skb->sk);
1126 struct nlattr **a = info->attrs;
1127 struct ovs_header *ovs_header = info->userhdr;
1128 struct sw_flow_key key;
1129 struct sw_flow *flow;
1130 struct sw_flow_mask mask;
1131 struct sk_buff *reply = NULL;
1132 struct datapath *dp;
1133 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1134 struct sw_flow_match match;
1135 struct sw_flow_id sfid;
1136 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1138 bool log = !a[OVS_FLOW_ATTR_PROBE];
1141 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1142 if (a[OVS_FLOW_ATTR_KEY]) {
1143 ovs_match_init(&match, &key, true, &mask);
1144 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1145 a[OVS_FLOW_ATTR_MASK], log);
1146 } else if (!ufid_present) {
1148 "Flow set message rejected, Key attribute missing.");
1154 /* Validate actions. */
1155 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1156 if (!a[OVS_FLOW_ATTR_KEY]) {
1158 "Flow key attribute not present in set flow.");
1163 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key,
1166 error = PTR_ERR(acts);
1170 /* Can allocate before locking if have acts. */
1171 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1173 if (IS_ERR(reply)) {
1174 error = PTR_ERR(reply);
1175 goto err_kfree_acts;
1180 dp = get_dp(net, ovs_header->dp_ifindex);
1181 if (unlikely(!dp)) {
1183 goto err_unlock_ovs;
1185 /* Check that the flow exists. */
1187 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1189 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1190 if (unlikely(!flow)) {
1192 goto err_unlock_ovs;
1195 /* Update actions, if present. */
1197 old_acts = ovsl_dereference(flow->sf_acts);
1198 rcu_assign_pointer(flow->sf_acts, acts);
1200 if (unlikely(reply)) {
1201 error = ovs_flow_cmd_fill_info(flow,
1202 ovs_header->dp_ifindex,
1203 reply, info->snd_portid,
1210 /* Could not alloc without acts before locking. */
1211 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1212 info, OVS_FLOW_CMD_NEW, false,
1215 if (IS_ERR(reply)) {
1216 error = PTR_ERR(reply);
1217 goto err_unlock_ovs;
1222 if (a[OVS_FLOW_ATTR_CLEAR])
1223 ovs_flow_stats_clear(flow);
1227 ovs_notify(&dp_flow_genl_family, reply, info);
1229 ovs_nla_free_flow_actions_rcu(old_acts);
1237 ovs_nla_free_flow_actions(acts);
1242 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1244 struct nlattr **a = info->attrs;
1245 struct ovs_header *ovs_header = info->userhdr;
1246 struct net *net = sock_net(skb->sk);
1247 struct sw_flow_key key;
1248 struct sk_buff *reply;
1249 struct sw_flow *flow;
1250 struct datapath *dp;
1251 struct sw_flow_match match;
1252 struct sw_flow_id ufid;
1253 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1255 bool log = !a[OVS_FLOW_ATTR_PROBE];
1258 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1259 if (a[OVS_FLOW_ATTR_KEY]) {
1260 ovs_match_init(&match, &key, true, NULL);
1261 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1263 } else if (!ufid_present) {
1265 "Flow get message rejected, Key attribute missing.");
1272 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1279 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1281 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1287 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1288 OVS_FLOW_CMD_NEW, true, ufid_flags);
1289 if (IS_ERR(reply)) {
1290 err = PTR_ERR(reply);
1295 return genlmsg_reply(reply, info);
1301 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1303 struct nlattr **a = info->attrs;
1304 struct ovs_header *ovs_header = info->userhdr;
1305 struct net *net = sock_net(skb->sk);
1306 struct sw_flow_key key;
1307 struct sk_buff *reply;
1308 struct sw_flow *flow = NULL;
1309 struct datapath *dp;
1310 struct sw_flow_match match;
1311 struct sw_flow_id ufid;
1312 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1314 bool log = !a[OVS_FLOW_ATTR_PROBE];
1317 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1318 if (a[OVS_FLOW_ATTR_KEY]) {
1319 ovs_match_init(&match, &key, true, NULL);
1320 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1327 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1328 if (unlikely(!dp)) {
1333 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1334 err = ovs_flow_tbl_flush(&dp->table);
1339 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1341 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1342 if (unlikely(!flow)) {
1347 ovs_flow_tbl_remove(&dp->table, flow);
1350 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1351 &flow->id, info, false, ufid_flags);
1352 if (likely(reply)) {
1353 if (likely(!IS_ERR(reply))) {
1354 rcu_read_lock(); /*To keep RCU checker happy. */
1355 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1356 reply, info->snd_portid,
1361 if (WARN_ON_ONCE(err < 0)) {
1366 ovs_notify(&dp_flow_genl_family, reply, info);
1368 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1373 ovs_flow_free(flow, true);
1380 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1382 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1383 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1384 struct table_instance *ti;
1385 struct datapath *dp;
1389 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1390 OVS_FLOW_ATTR_MAX, flow_policy);
1393 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1396 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1402 ti = rcu_dereference(dp->table.ti);
1404 struct sw_flow *flow;
1407 bucket = cb->args[0];
1409 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1413 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1414 NETLINK_CB(cb->skb).portid,
1415 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1416 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1419 cb->args[0] = bucket;
1426 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1427 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1428 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1429 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1430 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1431 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1432 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1433 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1436 static const struct genl_ops dp_flow_genl_ops[] = {
1437 { .cmd = OVS_FLOW_CMD_NEW,
1438 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1439 .policy = flow_policy,
1440 .doit = ovs_flow_cmd_new
1442 { .cmd = OVS_FLOW_CMD_DEL,
1443 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1444 .policy = flow_policy,
1445 .doit = ovs_flow_cmd_del
1447 { .cmd = OVS_FLOW_CMD_GET,
1448 .flags = 0, /* OK for unprivileged users. */
1449 .policy = flow_policy,
1450 .doit = ovs_flow_cmd_get,
1451 .dumpit = ovs_flow_cmd_dump
1453 { .cmd = OVS_FLOW_CMD_SET,
1454 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1455 .policy = flow_policy,
1456 .doit = ovs_flow_cmd_set,
1460 static struct genl_family dp_flow_genl_family = {
1461 .id = GENL_ID_GENERATE,
1462 .hdrsize = sizeof(struct ovs_header),
1463 .name = OVS_FLOW_FAMILY,
1464 .version = OVS_FLOW_VERSION,
1465 .maxattr = OVS_FLOW_ATTR_MAX,
1467 .parallel_ops = true,
1468 .ops = dp_flow_genl_ops,
1469 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1470 .mcgrps = &ovs_dp_flow_multicast_group,
1474 static size_t ovs_dp_cmd_msg_size(void)
1476 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1478 msgsize += nla_total_size(IFNAMSIZ);
1479 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1480 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1481 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1486 /* Called with ovs_mutex. */
1487 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1488 u32 portid, u32 seq, u32 flags, u8 cmd)
1490 struct ovs_header *ovs_header;
1491 struct ovs_dp_stats dp_stats;
1492 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1495 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1500 ovs_header->dp_ifindex = get_dpifindex(dp);
1502 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1504 goto nla_put_failure;
1506 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1507 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1508 &dp_stats, OVS_DP_ATTR_PAD))
1509 goto nla_put_failure;
1511 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1512 sizeof(struct ovs_dp_megaflow_stats),
1513 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1514 goto nla_put_failure;
1516 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1517 goto nla_put_failure;
1519 genlmsg_end(skb, ovs_header);
1523 genlmsg_cancel(skb, ovs_header);
1528 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1530 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1533 /* Called with rcu_read_lock or ovs_mutex. */
1534 static struct datapath *lookup_datapath(struct net *net,
1535 const struct ovs_header *ovs_header,
1536 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1538 struct datapath *dp;
1540 if (!a[OVS_DP_ATTR_NAME])
1541 dp = get_dp(net, ovs_header->dp_ifindex);
1543 struct vport *vport;
1545 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1546 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1548 return dp ? dp : ERR_PTR(-ENODEV);
1551 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1553 struct datapath *dp;
1555 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1559 pr_warn("%s: Dropping previously announced user features\n",
1561 dp->user_features = 0;
1564 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1566 if (a[OVS_DP_ATTR_USER_FEATURES])
1567 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1570 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1572 struct nlattr **a = info->attrs;
1573 struct vport_parms parms;
1574 struct sk_buff *reply;
1575 struct datapath *dp;
1576 struct vport *vport;
1577 struct ovs_net *ovs_net;
1581 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1584 reply = ovs_dp_cmd_alloc_info();
1589 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1591 goto err_free_reply;
1593 ovs_dp_set_net(dp, sock_net(skb->sk));
1595 /* Allocate table. */
1596 err = ovs_flow_tbl_init(&dp->table);
1600 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1601 if (!dp->stats_percpu) {
1603 goto err_destroy_table;
1606 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1610 goto err_destroy_percpu;
1613 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1614 INIT_HLIST_HEAD(&dp->ports[i]);
1616 /* Set up our datapath device. */
1617 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1618 parms.type = OVS_VPORT_TYPE_INTERNAL;
1619 parms.options = NULL;
1621 parms.port_no = OVSP_LOCAL;
1622 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1624 ovs_dp_change(dp, a);
1626 /* So far only local changes have been made, now need the lock. */
1629 vport = new_vport(&parms);
1630 if (IS_ERR(vport)) {
1631 err = PTR_ERR(vport);
1635 if (err == -EEXIST) {
1636 /* An outdated user space instance that does not understand
1637 * the concept of user_features has attempted to create a new
1638 * datapath and is likely to reuse it. Drop all user features.
1640 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1641 ovs_dp_reset_user_features(skb, info);
1644 goto err_destroy_ports_array;
1647 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1648 info->snd_seq, 0, OVS_DP_CMD_NEW);
1651 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1652 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1656 ovs_notify(&dp_datapath_genl_family, reply, info);
1659 err_destroy_ports_array:
1663 free_percpu(dp->stats_percpu);
1665 ovs_flow_tbl_destroy(&dp->table);
1674 /* Called with ovs_mutex. */
1675 static void __dp_destroy(struct datapath *dp)
1679 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1680 struct vport *vport;
1681 struct hlist_node *n;
1683 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1684 if (vport->port_no != OVSP_LOCAL)
1685 ovs_dp_detach_port(vport);
1688 list_del_rcu(&dp->list_node);
1690 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1691 * all ports in datapath are destroyed first before freeing datapath.
1693 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1695 /* RCU destroy the flow table */
1696 call_rcu(&dp->rcu, destroy_dp_rcu);
1699 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1701 struct sk_buff *reply;
1702 struct datapath *dp;
1705 reply = ovs_dp_cmd_alloc_info();
1710 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1713 goto err_unlock_free;
1715 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1716 info->snd_seq, 0, OVS_DP_CMD_DEL);
1722 ovs_notify(&dp_datapath_genl_family, reply, info);
1732 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1734 struct sk_buff *reply;
1735 struct datapath *dp;
1738 reply = ovs_dp_cmd_alloc_info();
1743 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1746 goto err_unlock_free;
1748 ovs_dp_change(dp, info->attrs);
1750 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1751 info->snd_seq, 0, OVS_DP_CMD_NEW);
1755 ovs_notify(&dp_datapath_genl_family, reply, info);
1765 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1767 struct sk_buff *reply;
1768 struct datapath *dp;
1771 reply = ovs_dp_cmd_alloc_info();
1776 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1779 goto err_unlock_free;
1781 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1782 info->snd_seq, 0, OVS_DP_CMD_NEW);
1786 return genlmsg_reply(reply, info);
1794 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1796 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1797 struct datapath *dp;
1798 int skip = cb->args[0];
1802 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1804 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1805 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1806 OVS_DP_CMD_NEW) < 0)
1817 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1818 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1819 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1820 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1823 static const struct genl_ops dp_datapath_genl_ops[] = {
1824 { .cmd = OVS_DP_CMD_NEW,
1825 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1826 .policy = datapath_policy,
1827 .doit = ovs_dp_cmd_new
1829 { .cmd = OVS_DP_CMD_DEL,
1830 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1831 .policy = datapath_policy,
1832 .doit = ovs_dp_cmd_del
1834 { .cmd = OVS_DP_CMD_GET,
1835 .flags = 0, /* OK for unprivileged users. */
1836 .policy = datapath_policy,
1837 .doit = ovs_dp_cmd_get,
1838 .dumpit = ovs_dp_cmd_dump
1840 { .cmd = OVS_DP_CMD_SET,
1841 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1842 .policy = datapath_policy,
1843 .doit = ovs_dp_cmd_set,
1847 static struct genl_family dp_datapath_genl_family = {
1848 .id = GENL_ID_GENERATE,
1849 .hdrsize = sizeof(struct ovs_header),
1850 .name = OVS_DATAPATH_FAMILY,
1851 .version = OVS_DATAPATH_VERSION,
1852 .maxattr = OVS_DP_ATTR_MAX,
1854 .parallel_ops = true,
1855 .ops = dp_datapath_genl_ops,
1856 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1857 .mcgrps = &ovs_dp_datapath_multicast_group,
1861 /* Called with ovs_mutex or RCU read lock. */
1862 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1863 u32 portid, u32 seq, u32 flags, u8 cmd)
1865 struct ovs_header *ovs_header;
1866 struct ovs_vport_stats vport_stats;
1869 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1874 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1876 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1877 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1878 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1879 ovs_vport_name(vport)))
1880 goto nla_put_failure;
1882 ovs_vport_get_stats(vport, &vport_stats);
1883 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1884 sizeof(struct ovs_vport_stats), &vport_stats,
1885 OVS_VPORT_ATTR_PAD))
1886 goto nla_put_failure;
1888 if (ovs_vport_get_upcall_portids(vport, skb))
1889 goto nla_put_failure;
1891 err = ovs_vport_get_options(vport, skb);
1892 if (err == -EMSGSIZE)
1895 genlmsg_end(skb, ovs_header);
1901 genlmsg_cancel(skb, ovs_header);
1905 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1907 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1910 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1911 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1914 struct sk_buff *skb;
1917 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1919 return ERR_PTR(-ENOMEM);
1921 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1927 /* Called with ovs_mutex or RCU read lock. */
1928 static struct vport *lookup_vport(struct net *net,
1929 const struct ovs_header *ovs_header,
1930 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1932 struct datapath *dp;
1933 struct vport *vport;
1935 if (a[OVS_VPORT_ATTR_NAME]) {
1936 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1938 return ERR_PTR(-ENODEV);
1939 if (ovs_header->dp_ifindex &&
1940 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1941 return ERR_PTR(-ENODEV);
1943 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1944 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1946 if (port_no >= DP_MAX_PORTS)
1947 return ERR_PTR(-EFBIG);
1949 dp = get_dp(net, ovs_header->dp_ifindex);
1951 return ERR_PTR(-ENODEV);
1953 vport = ovs_vport_ovsl_rcu(dp, port_no);
1955 return ERR_PTR(-ENODEV);
1958 return ERR_PTR(-EINVAL);
1961 /* Called with ovs_mutex */
1962 static void update_headroom(struct datapath *dp)
1964 unsigned dev_headroom, max_headroom = 0;
1965 struct net_device *dev;
1966 struct vport *vport;
1969 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1970 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1972 dev_headroom = netdev_get_fwd_headroom(dev);
1973 if (dev_headroom > max_headroom)
1974 max_headroom = dev_headroom;
1978 dp->max_headroom = max_headroom;
1979 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1980 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
1981 netdev_set_rx_headroom(vport->dev, max_headroom);
1984 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1986 struct nlattr **a = info->attrs;
1987 struct ovs_header *ovs_header = info->userhdr;
1988 struct vport_parms parms;
1989 struct sk_buff *reply;
1990 struct vport *vport;
1991 struct datapath *dp;
1995 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1996 !a[OVS_VPORT_ATTR_UPCALL_PID])
1999 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2000 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2001 if (port_no >= DP_MAX_PORTS)
2004 reply = ovs_vport_cmd_alloc_info();
2010 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2013 goto exit_unlock_free;
2016 vport = ovs_vport_ovsl(dp, port_no);
2019 goto exit_unlock_free;
2021 for (port_no = 1; ; port_no++) {
2022 if (port_no >= DP_MAX_PORTS) {
2024 goto exit_unlock_free;
2026 vport = ovs_vport_ovsl(dp, port_no);
2032 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2033 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2034 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2036 parms.port_no = port_no;
2037 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2039 vport = new_vport(&parms);
2040 err = PTR_ERR(vport);
2041 if (IS_ERR(vport)) {
2044 goto exit_unlock_free;
2047 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2048 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2050 if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
2051 update_headroom(dp);
2053 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2058 ovs_notify(&dp_vport_genl_family, reply, info);
2067 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2069 struct nlattr **a = info->attrs;
2070 struct sk_buff *reply;
2071 struct vport *vport;
2074 reply = ovs_vport_cmd_alloc_info();
2079 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2080 err = PTR_ERR(vport);
2082 goto exit_unlock_free;
2084 if (a[OVS_VPORT_ATTR_TYPE] &&
2085 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2087 goto exit_unlock_free;
2090 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2091 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2093 goto exit_unlock_free;
2097 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2098 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2100 err = ovs_vport_set_upcall_portids(vport, ids);
2102 goto exit_unlock_free;
2105 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2106 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2110 ovs_notify(&dp_vport_genl_family, reply, info);
2119 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2121 bool must_update_headroom = false;
2122 struct nlattr **a = info->attrs;
2123 struct sk_buff *reply;
2124 struct datapath *dp;
2125 struct vport *vport;
2128 reply = ovs_vport_cmd_alloc_info();
2133 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2134 err = PTR_ERR(vport);
2136 goto exit_unlock_free;
2138 if (vport->port_no == OVSP_LOCAL) {
2140 goto exit_unlock_free;
2143 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2144 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2147 /* the vport deletion may trigger dp headroom update */
2149 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2150 must_update_headroom = true;
2151 netdev_reset_rx_headroom(vport->dev);
2152 ovs_dp_detach_port(vport);
2154 if (must_update_headroom)
2155 update_headroom(dp);
2158 ovs_notify(&dp_vport_genl_family, reply, info);
2167 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2169 struct nlattr **a = info->attrs;
2170 struct ovs_header *ovs_header = info->userhdr;
2171 struct sk_buff *reply;
2172 struct vport *vport;
2175 reply = ovs_vport_cmd_alloc_info();
2180 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2181 err = PTR_ERR(vport);
2183 goto exit_unlock_free;
2184 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2185 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2189 return genlmsg_reply(reply, info);
2197 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2199 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2200 struct datapath *dp;
2201 int bucket = cb->args[0], skip = cb->args[1];
2205 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2210 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2211 struct vport *vport;
2214 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2216 ovs_vport_cmd_fill_info(vport, skb,
2217 NETLINK_CB(cb->skb).portid,
2220 OVS_VPORT_CMD_NEW) < 0)
2236 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2237 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2238 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2239 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2240 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2241 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2242 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2245 static const struct genl_ops dp_vport_genl_ops[] = {
2246 { .cmd = OVS_VPORT_CMD_NEW,
2247 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2248 .policy = vport_policy,
2249 .doit = ovs_vport_cmd_new
2251 { .cmd = OVS_VPORT_CMD_DEL,
2252 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2253 .policy = vport_policy,
2254 .doit = ovs_vport_cmd_del
2256 { .cmd = OVS_VPORT_CMD_GET,
2257 .flags = 0, /* OK for unprivileged users. */
2258 .policy = vport_policy,
2259 .doit = ovs_vport_cmd_get,
2260 .dumpit = ovs_vport_cmd_dump
2262 { .cmd = OVS_VPORT_CMD_SET,
2263 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2264 .policy = vport_policy,
2265 .doit = ovs_vport_cmd_set,
2269 struct genl_family dp_vport_genl_family = {
2270 .id = GENL_ID_GENERATE,
2271 .hdrsize = sizeof(struct ovs_header),
2272 .name = OVS_VPORT_FAMILY,
2273 .version = OVS_VPORT_VERSION,
2274 .maxattr = OVS_VPORT_ATTR_MAX,
2276 .parallel_ops = true,
2277 .ops = dp_vport_genl_ops,
2278 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2279 .mcgrps = &ovs_dp_vport_multicast_group,
2283 static struct genl_family * const dp_genl_families[] = {
2284 &dp_datapath_genl_family,
2285 &dp_vport_genl_family,
2286 &dp_flow_genl_family,
2287 &dp_packet_genl_family,
2290 static void dp_unregister_genl(int n_families)
2294 for (i = 0; i < n_families; i++)
2295 genl_unregister_family(dp_genl_families[i]);
2298 static int dp_register_genl(void)
2303 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2305 err = genl_register_family(dp_genl_families[i]);
2313 dp_unregister_genl(i);
2317 static int __net_init ovs_init_net(struct net *net)
2319 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2321 INIT_LIST_HEAD(&ovs_net->dps);
2322 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2327 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2328 struct list_head *head)
2330 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2331 struct datapath *dp;
2333 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2336 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2337 struct vport *vport;
2339 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2340 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2343 if (dev_net(vport->dev) == dnet)
2344 list_add(&vport->detach_list, head);
2350 static void __net_exit ovs_exit_net(struct net *dnet)
2352 struct datapath *dp, *dp_next;
2353 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2354 struct vport *vport, *vport_next;
2360 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2365 list_vports_from_net(net, dnet, &head);
2368 /* Detach all vports from given namespace. */
2369 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2370 list_del(&vport->detach_list);
2371 ovs_dp_detach_port(vport);
2376 cancel_work_sync(&ovs_net->dp_notify_work);
2379 static struct pernet_operations ovs_net_ops = {
2380 .init = ovs_init_net,
2381 .exit = ovs_exit_net,
2383 .size = sizeof(struct ovs_net),
2386 static int __init dp_init(void)
2390 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2392 pr_info("Open vSwitch switching datapath\n");
2394 err = action_fifos_init();
2398 err = ovs_internal_dev_rtnl_link_register();
2400 goto error_action_fifos_exit;
2402 err = ovs_flow_init();
2404 goto error_unreg_rtnl_link;
2406 err = ovs_vport_init();
2408 goto error_flow_exit;
2410 err = register_pernet_device(&ovs_net_ops);
2412 goto error_vport_exit;
2414 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2416 goto error_netns_exit;
2418 err = ovs_netdev_init();
2420 goto error_unreg_notifier;
2422 err = dp_register_genl();
2424 goto error_unreg_netdev;
2430 error_unreg_notifier:
2431 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2433 unregister_pernet_device(&ovs_net_ops);
2438 error_unreg_rtnl_link:
2439 ovs_internal_dev_rtnl_link_unregister();
2440 error_action_fifos_exit:
2441 action_fifos_exit();
2446 static void dp_cleanup(void)
2448 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2450 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2451 unregister_pernet_device(&ovs_net_ops);
2455 ovs_internal_dev_rtnl_link_unregister();
2456 action_fifos_exit();
2459 module_init(dp_init);
2460 module_exit(dp_cleanup);
2462 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2463 MODULE_LICENSE("GPL");
2464 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2465 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2466 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2467 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);