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);
285 stats_counter = &stats->n_missed;
289 ovs_flow_stats_update(flow, key->tp.flags, skb);
290 sf_acts = rcu_dereference(flow->sf_acts);
291 ovs_execute_actions(dp, skb, sf_acts, key);
293 stats_counter = &stats->n_hit;
296 /* Update datapath statistics. */
297 u64_stats_update_begin(&stats->syncp);
299 stats->n_mask_hit += n_mask_hit;
300 u64_stats_update_end(&stats->syncp);
303 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
304 const struct sw_flow_key *key,
305 const struct dp_upcall_info *upcall_info,
308 struct dp_stats_percpu *stats;
311 if (upcall_info->portid == 0) {
316 if (!skb_is_gso(skb))
317 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
319 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
326 stats = this_cpu_ptr(dp->stats_percpu);
328 u64_stats_update_begin(&stats->syncp);
330 u64_stats_update_end(&stats->syncp);
335 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
336 const struct sw_flow_key *key,
337 const struct dp_upcall_info *upcall_info,
340 unsigned short gso_type = skb_shinfo(skb)->gso_type;
341 struct sw_flow_key later_key;
342 struct sk_buff *segs, *nskb;
345 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
346 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
348 return PTR_ERR(segs);
352 if (gso_type & SKB_GSO_UDP) {
353 /* The initial flow key extracted by ovs_flow_key_extract()
354 * in this case is for a first fragment, so we need to
355 * properly mark later fragments.
358 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
361 /* Queue all of the segments. */
364 if (gso_type & SKB_GSO_UDP && skb != segs)
367 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
371 } while ((skb = skb->next));
373 /* Free all of the segments. */
381 } while ((skb = nskb));
385 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
386 unsigned int hdrlen, int actions_attrlen)
388 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
389 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
390 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
391 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
393 /* OVS_PACKET_ATTR_USERDATA */
394 if (upcall_info->userdata)
395 size += NLA_ALIGN(upcall_info->userdata->nla_len);
397 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
398 if (upcall_info->egress_tun_info)
399 size += nla_total_size(ovs_tun_key_attr_size());
401 /* OVS_PACKET_ATTR_ACTIONS */
402 if (upcall_info->actions_len)
403 size += nla_total_size(actions_attrlen);
405 /* OVS_PACKET_ATTR_MRU */
406 if (upcall_info->mru)
407 size += nla_total_size(sizeof(upcall_info->mru));
412 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
414 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
415 size_t plen = NLA_ALIGN(skb->len) - skb->len;
418 memset(skb_put(skb, plen), 0, plen);
422 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
423 const struct sw_flow_key *key,
424 const struct dp_upcall_info *upcall_info,
427 struct ovs_header *upcall;
428 struct sk_buff *nskb = NULL;
429 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
435 dp_ifindex = get_dpifindex(dp);
439 if (skb_vlan_tag_present(skb)) {
440 nskb = skb_clone(skb, GFP_ATOMIC);
444 nskb = __vlan_hwaccel_push_inside(nskb);
451 if (nla_attr_size(skb->len) > USHRT_MAX) {
456 /* Complete checksum if needed */
457 if (skb->ip_summed == CHECKSUM_PARTIAL &&
458 (err = skb_checksum_help(skb)))
461 /* Older versions of OVS user space enforce alignment of the last
462 * Netlink attribute to NLA_ALIGNTO which would require extensive
463 * padding logic. Only perform zerocopy if padding is not required.
465 if (dp->user_features & OVS_DP_F_UNALIGNED)
466 hlen = skb_zerocopy_headlen(skb);
470 len = upcall_msg_size(upcall_info, hlen - cutlen,
471 OVS_CB(skb)->acts_origlen);
472 user_skb = genlmsg_new(len, GFP_ATOMIC);
478 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
479 0, upcall_info->cmd);
480 upcall->dp_ifindex = dp_ifindex;
482 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
485 if (upcall_info->userdata)
486 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
487 nla_len(upcall_info->userdata),
488 nla_data(upcall_info->userdata));
490 if (upcall_info->egress_tun_info) {
491 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
492 err = ovs_nla_put_tunnel_info(user_skb,
493 upcall_info->egress_tun_info);
495 nla_nest_end(user_skb, nla);
498 if (upcall_info->actions_len) {
499 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
500 err = ovs_nla_put_actions(upcall_info->actions,
501 upcall_info->actions_len,
504 nla_nest_end(user_skb, nla);
506 nla_nest_cancel(user_skb, nla);
509 /* Add OVS_PACKET_ATTR_MRU */
510 if (upcall_info->mru) {
511 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
516 pad_packet(dp, user_skb);
519 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
521 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
526 pad_packet(dp, user_skb);
529 /* Only reserve room for attribute header, packet data is added
530 * in skb_zerocopy() */
531 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
535 nla->nla_len = nla_attr_size(skb->len - cutlen);
537 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
541 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
542 pad_packet(dp, user_skb);
544 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
546 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
556 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
558 struct ovs_header *ovs_header = info->userhdr;
559 struct net *net = sock_net(skb->sk);
560 struct nlattr **a = info->attrs;
561 struct sw_flow_actions *acts;
562 struct sk_buff *packet;
563 struct sw_flow *flow;
564 struct sw_flow_actions *sf_acts;
567 struct vport *input_vport;
571 bool log = !a[OVS_PACKET_ATTR_PROBE];
574 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
575 !a[OVS_PACKET_ATTR_ACTIONS])
578 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
579 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
583 skb_reserve(packet, NET_IP_ALIGN);
585 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
587 skb_reset_mac_header(packet);
588 eth = eth_hdr(packet);
590 /* Normally, setting the skb 'protocol' field would be handled by a
591 * call to eth_type_trans(), but it assumes there's a sending
592 * device, which we may not have. */
593 if (eth_proto_is_802_3(eth->h_proto))
594 packet->protocol = eth->h_proto;
596 packet->protocol = htons(ETH_P_802_2);
598 /* Set packet's mru */
599 if (a[OVS_PACKET_ATTR_MRU]) {
600 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
601 packet->ignore_df = 1;
603 OVS_CB(packet)->mru = mru;
605 /* Build an sw_flow for sending this packet. */
606 flow = ovs_flow_alloc();
611 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
612 packet, &flow->key, log);
616 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
617 &flow->key, &acts, log);
621 rcu_assign_pointer(flow->sf_acts, acts);
622 packet->priority = flow->key.phy.priority;
623 packet->mark = flow->key.phy.skb_mark;
626 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
631 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
633 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
638 packet->dev = input_vport->dev;
639 OVS_CB(packet)->input_vport = input_vport;
640 sf_acts = rcu_dereference(flow->sf_acts);
643 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
647 ovs_flow_free(flow, false);
653 ovs_flow_free(flow, false);
660 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
661 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
662 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
663 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
664 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
665 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
668 static const struct genl_ops dp_packet_genl_ops[] = {
669 { .cmd = OVS_PACKET_CMD_EXECUTE,
670 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
671 .policy = packet_policy,
672 .doit = ovs_packet_cmd_execute
676 static struct genl_family dp_packet_genl_family = {
677 .id = GENL_ID_GENERATE,
678 .hdrsize = sizeof(struct ovs_header),
679 .name = OVS_PACKET_FAMILY,
680 .version = OVS_PACKET_VERSION,
681 .maxattr = OVS_PACKET_ATTR_MAX,
683 .parallel_ops = true,
684 .ops = dp_packet_genl_ops,
685 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
688 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
689 struct ovs_dp_megaflow_stats *mega_stats)
693 memset(mega_stats, 0, sizeof(*mega_stats));
695 stats->n_flows = ovs_flow_tbl_count(&dp->table);
696 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
698 stats->n_hit = stats->n_missed = stats->n_lost = 0;
700 for_each_possible_cpu(i) {
701 const struct dp_stats_percpu *percpu_stats;
702 struct dp_stats_percpu local_stats;
705 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
708 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
709 local_stats = *percpu_stats;
710 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
712 stats->n_hit += local_stats.n_hit;
713 stats->n_missed += local_stats.n_missed;
714 stats->n_lost += local_stats.n_lost;
715 mega_stats->n_mask_hit += local_stats.n_mask_hit;
719 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
721 return ovs_identifier_is_ufid(sfid) &&
722 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
725 static bool should_fill_mask(uint32_t ufid_flags)
727 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
730 static bool should_fill_actions(uint32_t ufid_flags)
732 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
735 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
736 const struct sw_flow_id *sfid,
739 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
741 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
742 * see ovs_nla_put_identifier()
744 if (sfid && ovs_identifier_is_ufid(sfid))
745 len += nla_total_size(sfid->ufid_len);
747 len += nla_total_size(ovs_key_attr_size());
749 /* OVS_FLOW_ATTR_KEY */
750 if (!sfid || should_fill_key(sfid, ufid_flags))
751 len += nla_total_size(ovs_key_attr_size());
753 /* OVS_FLOW_ATTR_MASK */
754 if (should_fill_mask(ufid_flags))
755 len += nla_total_size(ovs_key_attr_size());
757 /* OVS_FLOW_ATTR_ACTIONS */
758 if (should_fill_actions(ufid_flags))
759 len += nla_total_size(acts->orig_len);
762 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
763 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
764 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
767 /* Called with ovs_mutex or RCU read lock. */
768 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
771 struct ovs_flow_stats stats;
775 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
778 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
782 if (stats.n_packets &&
783 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
784 sizeof(struct ovs_flow_stats), &stats,
788 if ((u8)ntohs(tcp_flags) &&
789 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
795 /* Called with ovs_mutex or RCU read lock. */
796 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
797 struct sk_buff *skb, int skb_orig_len)
799 struct nlattr *start;
802 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
803 * this is the first flow to be dumped into 'skb'. This is unusual for
804 * Netlink but individual action lists can be longer than
805 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
806 * The userspace caller can always fetch the actions separately if it
807 * really wants them. (Most userspace callers in fact don't care.)
809 * This can only fail for dump operations because the skb is always
810 * properly sized for single flows.
812 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
814 const struct sw_flow_actions *sf_acts;
816 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
817 err = ovs_nla_put_actions(sf_acts->actions,
818 sf_acts->actions_len, skb);
821 nla_nest_end(skb, start);
826 nla_nest_cancel(skb, start);
828 } else if (skb_orig_len) {
835 /* Called with ovs_mutex or RCU read lock. */
836 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
837 struct sk_buff *skb, u32 portid,
838 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
840 const int skb_orig_len = skb->len;
841 struct ovs_header *ovs_header;
844 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
849 ovs_header->dp_ifindex = dp_ifindex;
851 err = ovs_nla_put_identifier(flow, skb);
855 if (should_fill_key(&flow->id, ufid_flags)) {
856 err = ovs_nla_put_masked_key(flow, skb);
861 if (should_fill_mask(ufid_flags)) {
862 err = ovs_nla_put_mask(flow, skb);
867 err = ovs_flow_cmd_fill_stats(flow, skb);
871 if (should_fill_actions(ufid_flags)) {
872 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
877 genlmsg_end(skb, ovs_header);
881 genlmsg_cancel(skb, ovs_header);
885 /* May not be called with RCU read lock. */
886 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
887 const struct sw_flow_id *sfid,
888 struct genl_info *info,
895 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
898 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
899 skb = genlmsg_new(len, GFP_KERNEL);
901 return ERR_PTR(-ENOMEM);
906 /* Called with ovs_mutex. */
907 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
909 struct genl_info *info, u8 cmd,
910 bool always, u32 ufid_flags)
915 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
916 &flow->id, info, always, ufid_flags);
917 if (IS_ERR_OR_NULL(skb))
920 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
921 info->snd_portid, info->snd_seq, 0,
923 if (WARN_ON_ONCE(retval < 0)) {
925 skb = ERR_PTR(retval);
930 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
932 struct net *net = sock_net(skb->sk);
933 struct nlattr **a = info->attrs;
934 struct ovs_header *ovs_header = info->userhdr;
935 struct sw_flow *flow = NULL, *new_flow;
936 struct sw_flow_mask mask;
937 struct sk_buff *reply;
939 struct sw_flow_actions *acts;
940 struct sw_flow_match match;
941 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
943 bool log = !a[OVS_FLOW_ATTR_PROBE];
945 /* Must have key and actions. */
947 if (!a[OVS_FLOW_ATTR_KEY]) {
948 OVS_NLERR(log, "Flow key attr not present in new flow.");
951 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
952 OVS_NLERR(log, "Flow actions attr not present in new flow.");
956 /* Most of the time we need to allocate a new flow, do it before
959 new_flow = ovs_flow_alloc();
960 if (IS_ERR(new_flow)) {
961 error = PTR_ERR(new_flow);
966 ovs_match_init(&match, &new_flow->key, false, &mask);
967 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
968 a[OVS_FLOW_ATTR_MASK], log);
972 /* Extract flow identifier. */
973 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
974 &new_flow->key, log);
978 /* unmasked key is needed to match when ufid is not used. */
979 if (ovs_identifier_is_key(&new_flow->id))
980 match.key = new_flow->id.unmasked_key;
982 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
984 /* Validate actions. */
985 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
986 &new_flow->key, &acts, log);
988 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
992 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
995 error = PTR_ERR(reply);
1000 dp = get_dp(net, ovs_header->dp_ifindex);
1001 if (unlikely(!dp)) {
1003 goto err_unlock_ovs;
1006 /* Check if this is a duplicate flow */
1007 if (ovs_identifier_is_ufid(&new_flow->id))
1008 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
1010 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
1011 if (likely(!flow)) {
1012 rcu_assign_pointer(new_flow->sf_acts, acts);
1014 /* Put flow in bucket. */
1015 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1016 if (unlikely(error)) {
1018 goto err_unlock_ovs;
1021 if (unlikely(reply)) {
1022 error = ovs_flow_cmd_fill_info(new_flow,
1023 ovs_header->dp_ifindex,
1024 reply, info->snd_portid,
1032 struct sw_flow_actions *old_acts;
1034 /* Bail out if we're not allowed to modify an existing flow.
1035 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1036 * because Generic Netlink treats the latter as a dump
1037 * request. We also accept NLM_F_EXCL in case that bug ever
1040 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1043 goto err_unlock_ovs;
1045 /* The flow identifier has to be the same for flow updates.
1046 * Look for any overlapping flow.
1048 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1049 if (ovs_identifier_is_key(&flow->id))
1050 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1052 else /* UFID matches but key is different */
1056 goto err_unlock_ovs;
1059 /* Update actions. */
1060 old_acts = ovsl_dereference(flow->sf_acts);
1061 rcu_assign_pointer(flow->sf_acts, acts);
1063 if (unlikely(reply)) {
1064 error = ovs_flow_cmd_fill_info(flow,
1065 ovs_header->dp_ifindex,
1066 reply, info->snd_portid,
1074 ovs_nla_free_flow_actions_rcu(old_acts);
1075 ovs_flow_free(new_flow, false);
1079 ovs_notify(&dp_flow_genl_family, reply, info);
1086 ovs_nla_free_flow_actions(acts);
1088 ovs_flow_free(new_flow, false);
1093 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1094 static struct sw_flow_actions *get_flow_actions(struct net *net,
1095 const struct nlattr *a,
1096 const struct sw_flow_key *key,
1097 const struct sw_flow_mask *mask,
1100 struct sw_flow_actions *acts;
1101 struct sw_flow_key masked_key;
1104 ovs_flow_mask_key(&masked_key, key, true, mask);
1105 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1108 "Actions may not be safe on all matching packets");
1109 return ERR_PTR(error);
1115 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1117 struct net *net = sock_net(skb->sk);
1118 struct nlattr **a = info->attrs;
1119 struct ovs_header *ovs_header = info->userhdr;
1120 struct sw_flow_key key;
1121 struct sw_flow *flow;
1122 struct sw_flow_mask mask;
1123 struct sk_buff *reply = NULL;
1124 struct datapath *dp;
1125 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1126 struct sw_flow_match match;
1127 struct sw_flow_id sfid;
1128 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1130 bool log = !a[OVS_FLOW_ATTR_PROBE];
1133 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1134 if (a[OVS_FLOW_ATTR_KEY]) {
1135 ovs_match_init(&match, &key, true, &mask);
1136 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1137 a[OVS_FLOW_ATTR_MASK], log);
1138 } else if (!ufid_present) {
1140 "Flow set message rejected, Key attribute missing.");
1146 /* Validate actions. */
1147 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1148 if (!a[OVS_FLOW_ATTR_KEY]) {
1150 "Flow key attribute not present in set flow.");
1155 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key,
1158 error = PTR_ERR(acts);
1162 /* Can allocate before locking if have acts. */
1163 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1165 if (IS_ERR(reply)) {
1166 error = PTR_ERR(reply);
1167 goto err_kfree_acts;
1172 dp = get_dp(net, ovs_header->dp_ifindex);
1173 if (unlikely(!dp)) {
1175 goto err_unlock_ovs;
1177 /* Check that the flow exists. */
1179 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1181 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1182 if (unlikely(!flow)) {
1184 goto err_unlock_ovs;
1187 /* Update actions, if present. */
1189 old_acts = ovsl_dereference(flow->sf_acts);
1190 rcu_assign_pointer(flow->sf_acts, acts);
1192 if (unlikely(reply)) {
1193 error = ovs_flow_cmd_fill_info(flow,
1194 ovs_header->dp_ifindex,
1195 reply, info->snd_portid,
1202 /* Could not alloc without acts before locking. */
1203 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1204 info, OVS_FLOW_CMD_NEW, false,
1207 if (IS_ERR(reply)) {
1208 error = PTR_ERR(reply);
1209 goto err_unlock_ovs;
1214 if (a[OVS_FLOW_ATTR_CLEAR])
1215 ovs_flow_stats_clear(flow);
1219 ovs_notify(&dp_flow_genl_family, reply, info);
1221 ovs_nla_free_flow_actions_rcu(old_acts);
1229 ovs_nla_free_flow_actions(acts);
1234 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1236 struct nlattr **a = info->attrs;
1237 struct ovs_header *ovs_header = info->userhdr;
1238 struct net *net = sock_net(skb->sk);
1239 struct sw_flow_key key;
1240 struct sk_buff *reply;
1241 struct sw_flow *flow;
1242 struct datapath *dp;
1243 struct sw_flow_match match;
1244 struct sw_flow_id ufid;
1245 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1247 bool log = !a[OVS_FLOW_ATTR_PROBE];
1250 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1251 if (a[OVS_FLOW_ATTR_KEY]) {
1252 ovs_match_init(&match, &key, true, NULL);
1253 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1255 } else if (!ufid_present) {
1257 "Flow get message rejected, Key attribute missing.");
1264 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1271 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1273 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1279 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1280 OVS_FLOW_CMD_NEW, true, ufid_flags);
1281 if (IS_ERR(reply)) {
1282 err = PTR_ERR(reply);
1287 return genlmsg_reply(reply, info);
1293 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1295 struct nlattr **a = info->attrs;
1296 struct ovs_header *ovs_header = info->userhdr;
1297 struct net *net = sock_net(skb->sk);
1298 struct sw_flow_key key;
1299 struct sk_buff *reply;
1300 struct sw_flow *flow = NULL;
1301 struct datapath *dp;
1302 struct sw_flow_match match;
1303 struct sw_flow_id ufid;
1304 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1306 bool log = !a[OVS_FLOW_ATTR_PROBE];
1309 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1310 if (a[OVS_FLOW_ATTR_KEY]) {
1311 ovs_match_init(&match, &key, true, NULL);
1312 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1319 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1320 if (unlikely(!dp)) {
1325 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1326 err = ovs_flow_tbl_flush(&dp->table);
1331 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1333 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1334 if (unlikely(!flow)) {
1339 ovs_flow_tbl_remove(&dp->table, flow);
1342 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1343 &flow->id, info, false, ufid_flags);
1344 if (likely(reply)) {
1345 if (likely(!IS_ERR(reply))) {
1346 rcu_read_lock(); /*To keep RCU checker happy. */
1347 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1348 reply, info->snd_portid,
1353 if (WARN_ON_ONCE(err < 0)) {
1358 ovs_notify(&dp_flow_genl_family, reply, info);
1360 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1365 ovs_flow_free(flow, true);
1372 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1374 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1375 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1376 struct table_instance *ti;
1377 struct datapath *dp;
1381 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1382 OVS_FLOW_ATTR_MAX, flow_policy);
1385 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1388 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1394 ti = rcu_dereference(dp->table.ti);
1396 struct sw_flow *flow;
1399 bucket = cb->args[0];
1401 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1405 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1406 NETLINK_CB(cb->skb).portid,
1407 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1408 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1411 cb->args[0] = bucket;
1418 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1419 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1420 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1421 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1422 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1423 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1424 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1425 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1428 static const struct genl_ops dp_flow_genl_ops[] = {
1429 { .cmd = OVS_FLOW_CMD_NEW,
1430 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1431 .policy = flow_policy,
1432 .doit = ovs_flow_cmd_new
1434 { .cmd = OVS_FLOW_CMD_DEL,
1435 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1436 .policy = flow_policy,
1437 .doit = ovs_flow_cmd_del
1439 { .cmd = OVS_FLOW_CMD_GET,
1440 .flags = 0, /* OK for unprivileged users. */
1441 .policy = flow_policy,
1442 .doit = ovs_flow_cmd_get,
1443 .dumpit = ovs_flow_cmd_dump
1445 { .cmd = OVS_FLOW_CMD_SET,
1446 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1447 .policy = flow_policy,
1448 .doit = ovs_flow_cmd_set,
1452 static struct genl_family dp_flow_genl_family = {
1453 .id = GENL_ID_GENERATE,
1454 .hdrsize = sizeof(struct ovs_header),
1455 .name = OVS_FLOW_FAMILY,
1456 .version = OVS_FLOW_VERSION,
1457 .maxattr = OVS_FLOW_ATTR_MAX,
1459 .parallel_ops = true,
1460 .ops = dp_flow_genl_ops,
1461 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1462 .mcgrps = &ovs_dp_flow_multicast_group,
1466 static size_t ovs_dp_cmd_msg_size(void)
1468 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1470 msgsize += nla_total_size(IFNAMSIZ);
1471 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1472 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1473 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1478 /* Called with ovs_mutex. */
1479 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1480 u32 portid, u32 seq, u32 flags, u8 cmd)
1482 struct ovs_header *ovs_header;
1483 struct ovs_dp_stats dp_stats;
1484 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1487 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1492 ovs_header->dp_ifindex = get_dpifindex(dp);
1494 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1496 goto nla_put_failure;
1498 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1499 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1500 &dp_stats, OVS_DP_ATTR_PAD))
1501 goto nla_put_failure;
1503 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1504 sizeof(struct ovs_dp_megaflow_stats),
1505 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1506 goto nla_put_failure;
1508 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1509 goto nla_put_failure;
1511 genlmsg_end(skb, ovs_header);
1515 genlmsg_cancel(skb, ovs_header);
1520 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1522 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1525 /* Called with rcu_read_lock or ovs_mutex. */
1526 static struct datapath *lookup_datapath(struct net *net,
1527 const struct ovs_header *ovs_header,
1528 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1530 struct datapath *dp;
1532 if (!a[OVS_DP_ATTR_NAME])
1533 dp = get_dp(net, ovs_header->dp_ifindex);
1535 struct vport *vport;
1537 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1538 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1540 return dp ? dp : ERR_PTR(-ENODEV);
1543 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1545 struct datapath *dp;
1547 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1551 WARN(dp->user_features, "Dropping previously announced user features\n");
1552 dp->user_features = 0;
1555 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1557 if (a[OVS_DP_ATTR_USER_FEATURES])
1558 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1561 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1563 struct nlattr **a = info->attrs;
1564 struct vport_parms parms;
1565 struct sk_buff *reply;
1566 struct datapath *dp;
1567 struct vport *vport;
1568 struct ovs_net *ovs_net;
1572 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1575 reply = ovs_dp_cmd_alloc_info();
1580 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1582 goto err_free_reply;
1584 ovs_dp_set_net(dp, sock_net(skb->sk));
1586 /* Allocate table. */
1587 err = ovs_flow_tbl_init(&dp->table);
1591 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1592 if (!dp->stats_percpu) {
1594 goto err_destroy_table;
1597 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1601 goto err_destroy_percpu;
1604 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1605 INIT_HLIST_HEAD(&dp->ports[i]);
1607 /* Set up our datapath device. */
1608 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1609 parms.type = OVS_VPORT_TYPE_INTERNAL;
1610 parms.options = NULL;
1612 parms.port_no = OVSP_LOCAL;
1613 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1615 ovs_dp_change(dp, a);
1617 /* So far only local changes have been made, now need the lock. */
1620 vport = new_vport(&parms);
1621 if (IS_ERR(vport)) {
1622 err = PTR_ERR(vport);
1626 if (err == -EEXIST) {
1627 /* An outdated user space instance that does not understand
1628 * the concept of user_features has attempted to create a new
1629 * datapath and is likely to reuse it. Drop all user features.
1631 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1632 ovs_dp_reset_user_features(skb, info);
1635 goto err_destroy_ports_array;
1638 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1639 info->snd_seq, 0, OVS_DP_CMD_NEW);
1642 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1643 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1647 ovs_notify(&dp_datapath_genl_family, reply, info);
1650 err_destroy_ports_array:
1654 free_percpu(dp->stats_percpu);
1656 ovs_flow_tbl_destroy(&dp->table);
1665 /* Called with ovs_mutex. */
1666 static void __dp_destroy(struct datapath *dp)
1670 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1671 struct vport *vport;
1672 struct hlist_node *n;
1674 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1675 if (vport->port_no != OVSP_LOCAL)
1676 ovs_dp_detach_port(vport);
1679 list_del_rcu(&dp->list_node);
1681 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1682 * all ports in datapath are destroyed first before freeing datapath.
1684 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1686 /* RCU destroy the flow table */
1687 call_rcu(&dp->rcu, destroy_dp_rcu);
1690 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1692 struct sk_buff *reply;
1693 struct datapath *dp;
1696 reply = ovs_dp_cmd_alloc_info();
1701 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1704 goto err_unlock_free;
1706 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1707 info->snd_seq, 0, OVS_DP_CMD_DEL);
1713 ovs_notify(&dp_datapath_genl_family, reply, info);
1723 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1725 struct sk_buff *reply;
1726 struct datapath *dp;
1729 reply = ovs_dp_cmd_alloc_info();
1734 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1737 goto err_unlock_free;
1739 ovs_dp_change(dp, info->attrs);
1741 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1742 info->snd_seq, 0, OVS_DP_CMD_NEW);
1746 ovs_notify(&dp_datapath_genl_family, reply, info);
1756 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1758 struct sk_buff *reply;
1759 struct datapath *dp;
1762 reply = ovs_dp_cmd_alloc_info();
1767 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1770 goto err_unlock_free;
1772 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1773 info->snd_seq, 0, OVS_DP_CMD_NEW);
1777 return genlmsg_reply(reply, info);
1785 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1787 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1788 struct datapath *dp;
1789 int skip = cb->args[0];
1793 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1795 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1796 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1797 OVS_DP_CMD_NEW) < 0)
1808 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1809 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1810 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1811 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1814 static const struct genl_ops dp_datapath_genl_ops[] = {
1815 { .cmd = OVS_DP_CMD_NEW,
1816 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1817 .policy = datapath_policy,
1818 .doit = ovs_dp_cmd_new
1820 { .cmd = OVS_DP_CMD_DEL,
1821 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1822 .policy = datapath_policy,
1823 .doit = ovs_dp_cmd_del
1825 { .cmd = OVS_DP_CMD_GET,
1826 .flags = 0, /* OK for unprivileged users. */
1827 .policy = datapath_policy,
1828 .doit = ovs_dp_cmd_get,
1829 .dumpit = ovs_dp_cmd_dump
1831 { .cmd = OVS_DP_CMD_SET,
1832 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1833 .policy = datapath_policy,
1834 .doit = ovs_dp_cmd_set,
1838 static struct genl_family dp_datapath_genl_family = {
1839 .id = GENL_ID_GENERATE,
1840 .hdrsize = sizeof(struct ovs_header),
1841 .name = OVS_DATAPATH_FAMILY,
1842 .version = OVS_DATAPATH_VERSION,
1843 .maxattr = OVS_DP_ATTR_MAX,
1845 .parallel_ops = true,
1846 .ops = dp_datapath_genl_ops,
1847 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1848 .mcgrps = &ovs_dp_datapath_multicast_group,
1852 /* Called with ovs_mutex or RCU read lock. */
1853 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1854 u32 portid, u32 seq, u32 flags, u8 cmd)
1856 struct ovs_header *ovs_header;
1857 struct ovs_vport_stats vport_stats;
1860 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1865 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1867 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1868 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1869 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1870 ovs_vport_name(vport)))
1871 goto nla_put_failure;
1873 ovs_vport_get_stats(vport, &vport_stats);
1874 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1875 sizeof(struct ovs_vport_stats), &vport_stats,
1876 OVS_VPORT_ATTR_PAD))
1877 goto nla_put_failure;
1879 if (ovs_vport_get_upcall_portids(vport, skb))
1880 goto nla_put_failure;
1882 err = ovs_vport_get_options(vport, skb);
1883 if (err == -EMSGSIZE)
1886 genlmsg_end(skb, ovs_header);
1892 genlmsg_cancel(skb, ovs_header);
1896 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1898 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1901 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1902 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1905 struct sk_buff *skb;
1908 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1910 return ERR_PTR(-ENOMEM);
1912 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1918 /* Called with ovs_mutex or RCU read lock. */
1919 static struct vport *lookup_vport(struct net *net,
1920 const struct ovs_header *ovs_header,
1921 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1923 struct datapath *dp;
1924 struct vport *vport;
1926 if (a[OVS_VPORT_ATTR_NAME]) {
1927 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1929 return ERR_PTR(-ENODEV);
1930 if (ovs_header->dp_ifindex &&
1931 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1932 return ERR_PTR(-ENODEV);
1934 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1935 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1937 if (port_no >= DP_MAX_PORTS)
1938 return ERR_PTR(-EFBIG);
1940 dp = get_dp(net, ovs_header->dp_ifindex);
1942 return ERR_PTR(-ENODEV);
1944 vport = ovs_vport_ovsl_rcu(dp, port_no);
1946 return ERR_PTR(-ENODEV);
1949 return ERR_PTR(-EINVAL);
1952 /* Called with ovs_mutex */
1953 static void update_headroom(struct datapath *dp)
1955 unsigned dev_headroom, max_headroom = 0;
1956 struct net_device *dev;
1957 struct vport *vport;
1960 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1961 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1963 dev_headroom = netdev_get_fwd_headroom(dev);
1964 if (dev_headroom > max_headroom)
1965 max_headroom = dev_headroom;
1969 dp->max_headroom = max_headroom;
1970 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1971 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
1972 netdev_set_rx_headroom(vport->dev, max_headroom);
1975 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1977 struct nlattr **a = info->attrs;
1978 struct ovs_header *ovs_header = info->userhdr;
1979 struct vport_parms parms;
1980 struct sk_buff *reply;
1981 struct vport *vport;
1982 struct datapath *dp;
1986 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1987 !a[OVS_VPORT_ATTR_UPCALL_PID])
1990 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1991 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1992 if (port_no >= DP_MAX_PORTS)
1995 reply = ovs_vport_cmd_alloc_info();
2001 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2004 goto exit_unlock_free;
2007 vport = ovs_vport_ovsl(dp, port_no);
2010 goto exit_unlock_free;
2012 for (port_no = 1; ; port_no++) {
2013 if (port_no >= DP_MAX_PORTS) {
2015 goto exit_unlock_free;
2017 vport = ovs_vport_ovsl(dp, port_no);
2023 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2024 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2025 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2027 parms.port_no = port_no;
2028 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2030 vport = new_vport(&parms);
2031 err = PTR_ERR(vport);
2032 if (IS_ERR(vport)) {
2035 goto exit_unlock_free;
2038 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2039 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2041 if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
2042 update_headroom(dp);
2044 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2049 ovs_notify(&dp_vport_genl_family, reply, info);
2058 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2060 struct nlattr **a = info->attrs;
2061 struct sk_buff *reply;
2062 struct vport *vport;
2065 reply = ovs_vport_cmd_alloc_info();
2070 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2071 err = PTR_ERR(vport);
2073 goto exit_unlock_free;
2075 if (a[OVS_VPORT_ATTR_TYPE] &&
2076 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2078 goto exit_unlock_free;
2081 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2082 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2084 goto exit_unlock_free;
2088 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2089 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2091 err = ovs_vport_set_upcall_portids(vport, ids);
2093 goto exit_unlock_free;
2096 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2097 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2101 ovs_notify(&dp_vport_genl_family, reply, info);
2110 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2112 bool must_update_headroom = false;
2113 struct nlattr **a = info->attrs;
2114 struct sk_buff *reply;
2115 struct datapath *dp;
2116 struct vport *vport;
2119 reply = ovs_vport_cmd_alloc_info();
2124 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2125 err = PTR_ERR(vport);
2127 goto exit_unlock_free;
2129 if (vport->port_no == OVSP_LOCAL) {
2131 goto exit_unlock_free;
2134 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2135 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2138 /* the vport deletion may trigger dp headroom update */
2140 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2141 must_update_headroom = true;
2142 netdev_reset_rx_headroom(vport->dev);
2143 ovs_dp_detach_port(vport);
2145 if (must_update_headroom)
2146 update_headroom(dp);
2149 ovs_notify(&dp_vport_genl_family, reply, info);
2158 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2160 struct nlattr **a = info->attrs;
2161 struct ovs_header *ovs_header = info->userhdr;
2162 struct sk_buff *reply;
2163 struct vport *vport;
2166 reply = ovs_vport_cmd_alloc_info();
2171 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2172 err = PTR_ERR(vport);
2174 goto exit_unlock_free;
2175 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2176 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2180 return genlmsg_reply(reply, info);
2188 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2190 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2191 struct datapath *dp;
2192 int bucket = cb->args[0], skip = cb->args[1];
2196 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2201 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2202 struct vport *vport;
2205 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2207 ovs_vport_cmd_fill_info(vport, skb,
2208 NETLINK_CB(cb->skb).portid,
2211 OVS_VPORT_CMD_NEW) < 0)
2227 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2228 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2229 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2230 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2231 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2232 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2233 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2236 static const struct genl_ops dp_vport_genl_ops[] = {
2237 { .cmd = OVS_VPORT_CMD_NEW,
2238 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2239 .policy = vport_policy,
2240 .doit = ovs_vport_cmd_new
2242 { .cmd = OVS_VPORT_CMD_DEL,
2243 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2244 .policy = vport_policy,
2245 .doit = ovs_vport_cmd_del
2247 { .cmd = OVS_VPORT_CMD_GET,
2248 .flags = 0, /* OK for unprivileged users. */
2249 .policy = vport_policy,
2250 .doit = ovs_vport_cmd_get,
2251 .dumpit = ovs_vport_cmd_dump
2253 { .cmd = OVS_VPORT_CMD_SET,
2254 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2255 .policy = vport_policy,
2256 .doit = ovs_vport_cmd_set,
2260 struct genl_family dp_vport_genl_family = {
2261 .id = GENL_ID_GENERATE,
2262 .hdrsize = sizeof(struct ovs_header),
2263 .name = OVS_VPORT_FAMILY,
2264 .version = OVS_VPORT_VERSION,
2265 .maxattr = OVS_VPORT_ATTR_MAX,
2267 .parallel_ops = true,
2268 .ops = dp_vport_genl_ops,
2269 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2270 .mcgrps = &ovs_dp_vport_multicast_group,
2274 static struct genl_family * const dp_genl_families[] = {
2275 &dp_datapath_genl_family,
2276 &dp_vport_genl_family,
2277 &dp_flow_genl_family,
2278 &dp_packet_genl_family,
2281 static void dp_unregister_genl(int n_families)
2285 for (i = 0; i < n_families; i++)
2286 genl_unregister_family(dp_genl_families[i]);
2289 static int dp_register_genl(void)
2294 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2296 err = genl_register_family(dp_genl_families[i]);
2304 dp_unregister_genl(i);
2308 static int __net_init ovs_init_net(struct net *net)
2310 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2312 INIT_LIST_HEAD(&ovs_net->dps);
2313 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2318 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2319 struct list_head *head)
2321 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2322 struct datapath *dp;
2324 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2327 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2328 struct vport *vport;
2330 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2331 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2334 if (dev_net(vport->dev) == dnet)
2335 list_add(&vport->detach_list, head);
2341 static void __net_exit ovs_exit_net(struct net *dnet)
2343 struct datapath *dp, *dp_next;
2344 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2345 struct vport *vport, *vport_next;
2351 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2356 list_vports_from_net(net, dnet, &head);
2359 /* Detach all vports from given namespace. */
2360 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2361 list_del(&vport->detach_list);
2362 ovs_dp_detach_port(vport);
2367 cancel_work_sync(&ovs_net->dp_notify_work);
2370 static struct pernet_operations ovs_net_ops = {
2371 .init = ovs_init_net,
2372 .exit = ovs_exit_net,
2374 .size = sizeof(struct ovs_net),
2377 static int __init dp_init(void)
2381 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2383 pr_info("Open vSwitch switching datapath\n");
2385 err = action_fifos_init();
2389 err = ovs_internal_dev_rtnl_link_register();
2391 goto error_action_fifos_exit;
2393 err = ovs_flow_init();
2395 goto error_unreg_rtnl_link;
2397 err = ovs_vport_init();
2399 goto error_flow_exit;
2401 err = register_pernet_device(&ovs_net_ops);
2403 goto error_vport_exit;
2405 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2407 goto error_netns_exit;
2409 err = ovs_netdev_init();
2411 goto error_unreg_notifier;
2413 err = dp_register_genl();
2415 goto error_unreg_netdev;
2421 error_unreg_notifier:
2422 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2424 unregister_pernet_device(&ovs_net_ops);
2429 error_unreg_rtnl_link:
2430 ovs_internal_dev_rtnl_link_unregister();
2431 error_action_fifos_exit:
2432 action_fifos_exit();
2437 static void dp_cleanup(void)
2439 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2441 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2442 unregister_pernet_device(&ovs_net_ops);
2446 ovs_internal_dev_rtnl_link_unregister();
2447 action_fifos_exit();
2450 module_init(dp_init);
2451 module_exit(dp_cleanup);
2453 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2454 MODULE_LICENSE("GPL");
2455 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2456 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2457 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2458 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);