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, genl_info_net(info), info->snd_portid,
95 0, info->nlhdr, GFP_KERNEL);
101 * All writes e.g. Writes to device state (add/remove datapath, port, set
102 * operations on vports, etc.), Writes to other state (flow table
103 * modifications, set miscellaneous datapath parameters, etc.) are protected
106 * Reads are protected by RCU.
108 * There are a few special cases (mostly stats) that have their own
109 * synchronization but they nest under all of above and don't interact with
112 * The RTNL lock nests inside ovs_mutex.
115 static DEFINE_MUTEX(ovs_mutex);
119 mutex_lock(&ovs_mutex);
122 void ovs_unlock(void)
124 mutex_unlock(&ovs_mutex);
127 #ifdef CONFIG_LOCKDEP
128 int lockdep_ovsl_is_held(void)
131 return lockdep_is_held(&ovs_mutex);
135 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held);
138 static struct vport *new_vport(const struct vport_parms *);
139 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
140 const struct sw_flow_key *,
141 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 *);
146 /* Must be called with rcu_read_lock. */
147 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
149 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
152 struct vport *vport = ovs_internal_dev_get_vport(dev);
160 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
161 * returned dp pointer valid.
163 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
167 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
169 dp = get_dp_rcu(net, dp_ifindex);
175 /* Must be called with rcu_read_lock or ovs_mutex. */
176 const char *ovs_dp_name(const struct datapath *dp)
178 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
179 return ovs_vport_name(vport);
182 static int get_dpifindex(const struct datapath *dp)
189 local = ovs_vport_rcu(dp, OVSP_LOCAL);
191 ifindex = local->dev->ifindex;
200 static void destroy_dp_rcu(struct rcu_head *rcu)
202 struct datapath *dp = container_of(rcu, struct datapath, rcu);
204 ovs_flow_tbl_destroy(&dp->table);
205 free_percpu(dp->stats_percpu);
210 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
213 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
216 /* Called with ovs_mutex or RCU read lock. */
217 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
220 struct hlist_head *head;
222 head = vport_hash_bucket(dp, port_no);
223 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
224 if (vport->port_no == port_no)
230 /* Called with ovs_mutex. */
231 static struct vport *new_vport(const struct vport_parms *parms)
235 vport = ovs_vport_add(parms);
236 if (!IS_ERR(vport)) {
237 struct datapath *dp = parms->dp;
238 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
240 hlist_add_head_rcu(&vport->dp_hash_node, head);
245 void ovs_dp_detach_port(struct vport *p)
249 /* First drop references to device. */
250 hlist_del_rcu(&p->dp_hash_node);
252 /* Then destroy it. */
256 /* Must be called with rcu_read_lock. */
257 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
259 const struct vport *p = OVS_CB(skb)->input_vport;
260 struct datapath *dp = p->dp;
261 struct sw_flow *flow;
262 struct sw_flow_actions *sf_acts;
263 struct dp_stats_percpu *stats;
267 stats = this_cpu_ptr(dp->stats_percpu);
270 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
271 if (unlikely(!flow)) {
272 struct dp_upcall_info upcall;
275 memset(&upcall, 0, sizeof(upcall));
276 upcall.cmd = OVS_PACKET_CMD_MISS;
277 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
278 upcall.mru = OVS_CB(skb)->mru;
279 error = ovs_dp_upcall(dp, skb, key, &upcall);
284 stats_counter = &stats->n_missed;
288 ovs_flow_stats_update(flow, key->tp.flags, skb);
289 sf_acts = rcu_dereference(flow->sf_acts);
290 ovs_execute_actions(dp, skb, sf_acts, key);
292 stats_counter = &stats->n_hit;
295 /* Update datapath statistics. */
296 u64_stats_update_begin(&stats->syncp);
298 stats->n_mask_hit += n_mask_hit;
299 u64_stats_update_end(&stats->syncp);
302 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
303 const struct sw_flow_key *key,
304 const struct dp_upcall_info *upcall_info)
306 struct dp_stats_percpu *stats;
309 if (upcall_info->portid == 0) {
314 if (!skb_is_gso(skb))
315 err = queue_userspace_packet(dp, skb, key, upcall_info);
317 err = queue_gso_packets(dp, skb, key, upcall_info);
324 stats = this_cpu_ptr(dp->stats_percpu);
326 u64_stats_update_begin(&stats->syncp);
328 u64_stats_update_end(&stats->syncp);
333 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
334 const struct sw_flow_key *key,
335 const struct dp_upcall_info *upcall_info)
337 unsigned short gso_type = skb_shinfo(skb)->gso_type;
338 struct sw_flow_key later_key;
339 struct sk_buff *segs, *nskb;
340 struct ovs_skb_cb ovs_cb;
343 ovs_cb = *OVS_CB(skb);
344 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
345 *OVS_CB(skb) = ovs_cb;
347 return PTR_ERR(segs);
351 if (gso_type & SKB_GSO_UDP) {
352 /* The initial flow key extracted by ovs_flow_key_extract()
353 * in this case is for a first fragment, so we need to
354 * properly mark later fragments.
357 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
360 /* Queue all of the segments. */
363 *OVS_CB(skb) = ovs_cb;
364 if (gso_type & SKB_GSO_UDP && skb != segs)
367 err = queue_userspace_packet(dp, skb, key, upcall_info);
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,
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 */
392 /* OVS_PACKET_ATTR_USERDATA */
393 if (upcall_info->userdata)
394 size += NLA_ALIGN(upcall_info->userdata->nla_len);
396 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
397 if (upcall_info->egress_tun_info)
398 size += nla_total_size(ovs_tun_key_attr_size());
400 /* OVS_PACKET_ATTR_ACTIONS */
401 if (upcall_info->actions_len)
402 size += nla_total_size(upcall_info->actions_len);
404 /* OVS_PACKET_ATTR_MRU */
405 if (upcall_info->mru)
406 size += nla_total_size(sizeof(upcall_info->mru));
411 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
413 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
414 size_t plen = NLA_ALIGN(skb->len) - skb->len;
417 memset(skb_put(skb, plen), 0, plen);
421 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
422 const struct sw_flow_key *key,
423 const struct dp_upcall_info *upcall_info)
425 struct ovs_header *upcall;
426 struct sk_buff *nskb = NULL;
427 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
429 struct genl_info info = {
430 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
431 .snd_portid = upcall_info->portid,
437 dp_ifindex = get_dpifindex(dp);
441 if (skb_vlan_tag_present(skb)) {
442 nskb = skb_clone(skb, GFP_ATOMIC);
446 nskb = __vlan_hwaccel_push_inside(nskb);
453 if (nla_attr_size(skb->len) > USHRT_MAX) {
458 /* Complete checksum if needed */
459 if (skb->ip_summed == CHECKSUM_PARTIAL &&
460 (err = skb_checksum_help(skb)))
463 /* Older versions of OVS user space enforce alignment of the last
464 * Netlink attribute to NLA_ALIGNTO which would require extensive
465 * padding logic. Only perform zerocopy if padding is not required.
467 if (dp->user_features & OVS_DP_F_UNALIGNED)
468 hlen = skb_zerocopy_headlen(skb);
472 len = upcall_msg_size(upcall_info, hlen);
473 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
479 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
480 0, upcall_info->cmd);
481 upcall->dp_ifindex = dp_ifindex;
483 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
486 if (upcall_info->userdata)
487 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
488 nla_len(upcall_info->userdata),
489 nla_data(upcall_info->userdata));
491 if (upcall_info->egress_tun_info) {
492 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
493 err = ovs_nla_put_egress_tunnel_key(user_skb,
494 upcall_info->egress_tun_info,
495 upcall_info->egress_tun_opts);
497 nla_nest_end(user_skb, nla);
500 if (upcall_info->actions_len) {
501 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
502 err = ovs_nla_put_actions(upcall_info->actions,
503 upcall_info->actions_len,
506 nla_nest_end(user_skb, nla);
508 nla_nest_cancel(user_skb, nla);
511 /* Add OVS_PACKET_ATTR_MRU */
512 if (upcall_info->mru) {
513 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
518 pad_packet(dp, user_skb);
521 /* Only reserve room for attribute header, packet data is added
522 * in skb_zerocopy() */
523 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
527 nla->nla_len = nla_attr_size(skb->len);
529 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
533 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
534 pad_packet(dp, user_skb);
536 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
538 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
548 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
550 struct ovs_header *ovs_header = info->userhdr;
551 struct net *net = sock_net(skb->sk);
552 struct nlattr **a = info->attrs;
553 struct sw_flow_actions *acts;
554 struct sk_buff *packet;
555 struct sw_flow *flow;
556 struct sw_flow_actions *sf_acts;
559 struct vport *input_vport;
563 bool log = !a[OVS_PACKET_ATTR_PROBE];
566 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
567 !a[OVS_PACKET_ATTR_ACTIONS])
570 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
571 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
575 skb_reserve(packet, NET_IP_ALIGN);
577 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
579 skb_reset_mac_header(packet);
580 eth = eth_hdr(packet);
582 /* Normally, setting the skb 'protocol' field would be handled by a
583 * call to eth_type_trans(), but it assumes there's a sending
584 * device, which we may not have. */
585 if (eth_proto_is_802_3(eth->h_proto))
586 packet->protocol = eth->h_proto;
588 packet->protocol = htons(ETH_P_802_2);
590 /* Set packet's mru */
591 if (a[OVS_PACKET_ATTR_MRU]) {
592 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
593 packet->ignore_df = 1;
595 OVS_CB(packet)->mru = mru;
597 /* Build an sw_flow for sending this packet. */
598 flow = ovs_flow_alloc();
603 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
604 packet, &flow->key, log);
608 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
609 &flow->key, &acts, log);
613 rcu_assign_pointer(flow->sf_acts, acts);
614 packet->priority = flow->key.phy.priority;
615 packet->mark = flow->key.phy.skb_mark;
618 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
623 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
625 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
630 packet->dev = input_vport->dev;
631 OVS_CB(packet)->input_vport = input_vport;
632 sf_acts = rcu_dereference(flow->sf_acts);
635 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
639 ovs_flow_free(flow, false);
645 ovs_flow_free(flow, false);
652 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
653 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
654 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
655 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
656 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
657 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
660 static const struct genl_ops dp_packet_genl_ops[] = {
661 { .cmd = OVS_PACKET_CMD_EXECUTE,
662 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
663 .policy = packet_policy,
664 .doit = ovs_packet_cmd_execute
668 static struct genl_family dp_packet_genl_family = {
669 .id = GENL_ID_GENERATE,
670 .hdrsize = sizeof(struct ovs_header),
671 .name = OVS_PACKET_FAMILY,
672 .version = OVS_PACKET_VERSION,
673 .maxattr = OVS_PACKET_ATTR_MAX,
675 .parallel_ops = true,
676 .ops = dp_packet_genl_ops,
677 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
680 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
681 struct ovs_dp_megaflow_stats *mega_stats)
685 memset(mega_stats, 0, sizeof(*mega_stats));
687 stats->n_flows = ovs_flow_tbl_count(&dp->table);
688 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
690 stats->n_hit = stats->n_missed = stats->n_lost = 0;
692 for_each_possible_cpu(i) {
693 const struct dp_stats_percpu *percpu_stats;
694 struct dp_stats_percpu local_stats;
697 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
700 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
701 local_stats = *percpu_stats;
702 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
704 stats->n_hit += local_stats.n_hit;
705 stats->n_missed += local_stats.n_missed;
706 stats->n_lost += local_stats.n_lost;
707 mega_stats->n_mask_hit += local_stats.n_mask_hit;
711 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
713 return ovs_identifier_is_ufid(sfid) &&
714 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
717 static bool should_fill_mask(uint32_t ufid_flags)
719 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
722 static bool should_fill_actions(uint32_t ufid_flags)
724 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
727 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
728 const struct sw_flow_id *sfid,
731 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
733 /* OVS_FLOW_ATTR_UFID */
734 if (sfid && ovs_identifier_is_ufid(sfid))
735 len += nla_total_size(sfid->ufid_len);
737 /* OVS_FLOW_ATTR_KEY */
738 if (!sfid || should_fill_key(sfid, ufid_flags))
739 len += nla_total_size(ovs_key_attr_size());
741 /* OVS_FLOW_ATTR_MASK */
742 if (should_fill_mask(ufid_flags))
743 len += nla_total_size(ovs_key_attr_size());
745 /* OVS_FLOW_ATTR_ACTIONS */
746 if (should_fill_actions(ufid_flags))
747 len += nla_total_size(acts->orig_len);
750 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
751 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
752 + nla_total_size(8); /* OVS_FLOW_ATTR_USED */
755 /* Called with ovs_mutex or RCU read lock. */
756 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
759 struct ovs_flow_stats stats;
763 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
766 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
769 if (stats.n_packets &&
770 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
773 if ((u8)ntohs(tcp_flags) &&
774 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
780 /* Called with ovs_mutex or RCU read lock. */
781 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
782 struct sk_buff *skb, int skb_orig_len)
784 struct nlattr *start;
787 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
788 * this is the first flow to be dumped into 'skb'. This is unusual for
789 * Netlink but individual action lists can be longer than
790 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
791 * The userspace caller can always fetch the actions separately if it
792 * really wants them. (Most userspace callers in fact don't care.)
794 * This can only fail for dump operations because the skb is always
795 * properly sized for single flows.
797 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
799 const struct sw_flow_actions *sf_acts;
801 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
802 err = ovs_nla_put_actions(sf_acts->actions,
803 sf_acts->actions_len, skb);
806 nla_nest_end(skb, start);
811 nla_nest_cancel(skb, start);
813 } else if (skb_orig_len) {
820 /* Called with ovs_mutex or RCU read lock. */
821 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
822 struct sk_buff *skb, u32 portid,
823 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
825 const int skb_orig_len = skb->len;
826 struct ovs_header *ovs_header;
829 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
834 ovs_header->dp_ifindex = dp_ifindex;
836 err = ovs_nla_put_identifier(flow, skb);
840 if (should_fill_key(&flow->id, ufid_flags)) {
841 err = ovs_nla_put_masked_key(flow, skb);
846 if (should_fill_mask(ufid_flags)) {
847 err = ovs_nla_put_mask(flow, skb);
852 err = ovs_flow_cmd_fill_stats(flow, skb);
856 if (should_fill_actions(ufid_flags)) {
857 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
862 genlmsg_end(skb, ovs_header);
866 genlmsg_cancel(skb, ovs_header);
870 /* May not be called with RCU read lock. */
871 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
872 const struct sw_flow_id *sfid,
873 struct genl_info *info,
880 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
883 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
884 skb = genlmsg_new_unicast(len, info, GFP_KERNEL);
886 return ERR_PTR(-ENOMEM);
891 /* Called with ovs_mutex. */
892 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
894 struct genl_info *info, u8 cmd,
895 bool always, u32 ufid_flags)
900 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
901 &flow->id, info, always, ufid_flags);
902 if (IS_ERR_OR_NULL(skb))
905 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
906 info->snd_portid, info->snd_seq, 0,
912 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
914 struct net *net = sock_net(skb->sk);
915 struct nlattr **a = info->attrs;
916 struct ovs_header *ovs_header = info->userhdr;
917 struct sw_flow *flow = NULL, *new_flow;
918 struct sw_flow_mask mask;
919 struct sk_buff *reply;
921 struct sw_flow_key key;
922 struct sw_flow_actions *acts;
923 struct sw_flow_match match;
924 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
926 bool log = !a[OVS_FLOW_ATTR_PROBE];
928 /* Must have key and actions. */
930 if (!a[OVS_FLOW_ATTR_KEY]) {
931 OVS_NLERR(log, "Flow key attr not present in new flow.");
934 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
935 OVS_NLERR(log, "Flow actions attr not present in new flow.");
939 /* Most of the time we need to allocate a new flow, do it before
942 new_flow = ovs_flow_alloc();
943 if (IS_ERR(new_flow)) {
944 error = PTR_ERR(new_flow);
949 ovs_match_init(&match, &key, &mask);
950 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
951 a[OVS_FLOW_ATTR_MASK], log);
955 ovs_flow_mask_key(&new_flow->key, &key, true, &mask);
957 /* Extract flow identifier. */
958 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
963 /* Validate actions. */
964 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
965 &new_flow->key, &acts, log);
967 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
971 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
974 error = PTR_ERR(reply);
979 dp = get_dp(net, ovs_header->dp_ifindex);
985 /* Check if this is a duplicate flow */
986 if (ovs_identifier_is_ufid(&new_flow->id))
987 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
989 flow = ovs_flow_tbl_lookup(&dp->table, &key);
991 rcu_assign_pointer(new_flow->sf_acts, acts);
993 /* Put flow in bucket. */
994 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
995 if (unlikely(error)) {
1000 if (unlikely(reply)) {
1001 error = ovs_flow_cmd_fill_info(new_flow,
1002 ovs_header->dp_ifindex,
1003 reply, info->snd_portid,
1011 struct sw_flow_actions *old_acts;
1013 /* Bail out if we're not allowed to modify an existing flow.
1014 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1015 * because Generic Netlink treats the latter as a dump
1016 * request. We also accept NLM_F_EXCL in case that bug ever
1019 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1022 goto err_unlock_ovs;
1024 /* The flow identifier has to be the same for flow updates.
1025 * Look for any overlapping flow.
1027 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1028 if (ovs_identifier_is_key(&flow->id))
1029 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1031 else /* UFID matches but key is different */
1035 goto err_unlock_ovs;
1038 /* Update actions. */
1039 old_acts = ovsl_dereference(flow->sf_acts);
1040 rcu_assign_pointer(flow->sf_acts, acts);
1042 if (unlikely(reply)) {
1043 error = ovs_flow_cmd_fill_info(flow,
1044 ovs_header->dp_ifindex,
1045 reply, info->snd_portid,
1053 ovs_nla_free_flow_actions_rcu(old_acts);
1054 ovs_flow_free(new_flow, false);
1058 ovs_notify(&dp_flow_genl_family, reply, info);
1065 ovs_nla_free_flow_actions(acts);
1067 ovs_flow_free(new_flow, false);
1072 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1073 static struct sw_flow_actions *get_flow_actions(struct net *net,
1074 const struct nlattr *a,
1075 const struct sw_flow_key *key,
1076 const struct sw_flow_mask *mask,
1079 struct sw_flow_actions *acts;
1080 struct sw_flow_key masked_key;
1083 ovs_flow_mask_key(&masked_key, key, true, mask);
1084 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1087 "Actions may not be safe on all matching packets");
1088 return ERR_PTR(error);
1094 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1096 struct net *net = sock_net(skb->sk);
1097 struct nlattr **a = info->attrs;
1098 struct ovs_header *ovs_header = info->userhdr;
1099 struct sw_flow_key key;
1100 struct sw_flow *flow;
1101 struct sw_flow_mask mask;
1102 struct sk_buff *reply = NULL;
1103 struct datapath *dp;
1104 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1105 struct sw_flow_match match;
1106 struct sw_flow_id sfid;
1107 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1109 bool log = !a[OVS_FLOW_ATTR_PROBE];
1114 if (!a[OVS_FLOW_ATTR_KEY]) {
1115 OVS_NLERR(log, "Flow key attribute not present in set flow.");
1119 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1120 ovs_match_init(&match, &key, &mask);
1121 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1122 a[OVS_FLOW_ATTR_MASK], log);
1126 /* Validate actions. */
1127 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1128 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key,
1131 error = PTR_ERR(acts);
1135 /* Can allocate before locking if have acts. */
1136 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1138 if (IS_ERR(reply)) {
1139 error = PTR_ERR(reply);
1140 goto err_kfree_acts;
1145 dp = get_dp(net, ovs_header->dp_ifindex);
1146 if (unlikely(!dp)) {
1148 goto err_unlock_ovs;
1150 /* Check that the flow exists. */
1152 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1154 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1155 if (unlikely(!flow)) {
1157 goto err_unlock_ovs;
1160 /* Update actions, if present. */
1162 old_acts = ovsl_dereference(flow->sf_acts);
1163 rcu_assign_pointer(flow->sf_acts, acts);
1165 if (unlikely(reply)) {
1166 error = ovs_flow_cmd_fill_info(flow,
1167 ovs_header->dp_ifindex,
1168 reply, info->snd_portid,
1175 /* Could not alloc without acts before locking. */
1176 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1177 info, OVS_FLOW_CMD_NEW, false,
1180 if (unlikely(IS_ERR(reply))) {
1181 error = PTR_ERR(reply);
1182 goto err_unlock_ovs;
1187 if (a[OVS_FLOW_ATTR_CLEAR])
1188 ovs_flow_stats_clear(flow);
1192 ovs_notify(&dp_flow_genl_family, reply, info);
1194 ovs_nla_free_flow_actions_rcu(old_acts);
1202 ovs_nla_free_flow_actions(acts);
1207 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1209 struct nlattr **a = info->attrs;
1210 struct ovs_header *ovs_header = info->userhdr;
1211 struct net *net = sock_net(skb->sk);
1212 struct sw_flow_key key;
1213 struct sk_buff *reply;
1214 struct sw_flow *flow;
1215 struct datapath *dp;
1216 struct sw_flow_match match;
1217 struct sw_flow_id ufid;
1218 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1220 bool log = !a[OVS_FLOW_ATTR_PROBE];
1223 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1224 if (a[OVS_FLOW_ATTR_KEY]) {
1225 ovs_match_init(&match, &key, NULL);
1226 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1228 } else if (!ufid_present) {
1230 "Flow get message rejected, Key attribute missing.");
1237 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1244 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1246 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1252 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1253 OVS_FLOW_CMD_NEW, true, ufid_flags);
1254 if (IS_ERR(reply)) {
1255 err = PTR_ERR(reply);
1260 return genlmsg_reply(reply, info);
1266 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1268 struct nlattr **a = info->attrs;
1269 struct ovs_header *ovs_header = info->userhdr;
1270 struct net *net = sock_net(skb->sk);
1271 struct sw_flow_key key;
1272 struct sk_buff *reply;
1273 struct sw_flow *flow = NULL;
1274 struct datapath *dp;
1275 struct sw_flow_match match;
1276 struct sw_flow_id ufid;
1277 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1279 bool log = !a[OVS_FLOW_ATTR_PROBE];
1282 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1283 if (a[OVS_FLOW_ATTR_KEY]) {
1284 ovs_match_init(&match, &key, NULL);
1285 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1292 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1293 if (unlikely(!dp)) {
1298 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1299 err = ovs_flow_tbl_flush(&dp->table);
1304 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1306 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1307 if (unlikely(!flow)) {
1312 ovs_flow_tbl_remove(&dp->table, flow);
1315 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1316 &flow->id, info, false, ufid_flags);
1317 if (likely(reply)) {
1318 if (likely(!IS_ERR(reply))) {
1319 rcu_read_lock(); /*To keep RCU checker happy. */
1320 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1321 reply, info->snd_portid,
1328 ovs_notify(&dp_flow_genl_family, reply, info);
1330 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1334 ovs_flow_free(flow, true);
1341 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1343 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1344 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1345 struct table_instance *ti;
1346 struct datapath *dp;
1350 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1351 OVS_FLOW_ATTR_MAX, flow_policy);
1354 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1357 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1363 ti = rcu_dereference(dp->table.ti);
1365 struct sw_flow *flow;
1368 bucket = cb->args[0];
1370 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1374 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1375 NETLINK_CB(cb->skb).portid,
1376 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1377 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1380 cb->args[0] = bucket;
1387 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1388 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1389 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1390 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1391 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1392 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1393 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1394 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1397 static const struct genl_ops dp_flow_genl_ops[] = {
1398 { .cmd = OVS_FLOW_CMD_NEW,
1399 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1400 .policy = flow_policy,
1401 .doit = ovs_flow_cmd_new
1403 { .cmd = OVS_FLOW_CMD_DEL,
1404 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1405 .policy = flow_policy,
1406 .doit = ovs_flow_cmd_del
1408 { .cmd = OVS_FLOW_CMD_GET,
1409 .flags = 0, /* OK for unprivileged users. */
1410 .policy = flow_policy,
1411 .doit = ovs_flow_cmd_get,
1412 .dumpit = ovs_flow_cmd_dump
1414 { .cmd = OVS_FLOW_CMD_SET,
1415 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1416 .policy = flow_policy,
1417 .doit = ovs_flow_cmd_set,
1421 static struct genl_family dp_flow_genl_family = {
1422 .id = GENL_ID_GENERATE,
1423 .hdrsize = sizeof(struct ovs_header),
1424 .name = OVS_FLOW_FAMILY,
1425 .version = OVS_FLOW_VERSION,
1426 .maxattr = OVS_FLOW_ATTR_MAX,
1428 .parallel_ops = true,
1429 .ops = dp_flow_genl_ops,
1430 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1431 .mcgrps = &ovs_dp_flow_multicast_group,
1435 static size_t ovs_dp_cmd_msg_size(void)
1437 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1439 msgsize += nla_total_size(IFNAMSIZ);
1440 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1441 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1442 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1447 /* Called with ovs_mutex. */
1448 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1449 u32 portid, u32 seq, u32 flags, u8 cmd)
1451 struct ovs_header *ovs_header;
1452 struct ovs_dp_stats dp_stats;
1453 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1456 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1461 ovs_header->dp_ifindex = get_dpifindex(dp);
1463 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1465 goto nla_put_failure;
1467 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1468 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1470 goto nla_put_failure;
1472 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1473 sizeof(struct ovs_dp_megaflow_stats),
1474 &dp_megaflow_stats))
1475 goto nla_put_failure;
1477 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1478 goto nla_put_failure;
1480 genlmsg_end(skb, ovs_header);
1484 genlmsg_cancel(skb, ovs_header);
1489 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1491 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1494 /* Called with rcu_read_lock or ovs_mutex. */
1495 static struct datapath *lookup_datapath(struct net *net,
1496 const struct ovs_header *ovs_header,
1497 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1499 struct datapath *dp;
1501 if (!a[OVS_DP_ATTR_NAME])
1502 dp = get_dp(net, ovs_header->dp_ifindex);
1504 struct vport *vport;
1506 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1507 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1509 return dp ? dp : ERR_PTR(-ENODEV);
1512 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1514 struct datapath *dp;
1516 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1520 WARN(dp->user_features, "Dropping previously announced user features\n");
1521 dp->user_features = 0;
1524 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1526 if (a[OVS_DP_ATTR_USER_FEATURES])
1527 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1530 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1532 struct nlattr **a = info->attrs;
1533 struct vport_parms parms;
1534 struct sk_buff *reply;
1535 struct datapath *dp;
1536 struct vport *vport;
1537 struct ovs_net *ovs_net;
1541 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1544 reply = ovs_dp_cmd_alloc_info(info);
1549 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1551 goto err_free_reply;
1553 ovs_dp_set_net(dp, sock_net(skb->sk));
1555 /* Allocate table. */
1556 err = ovs_flow_tbl_init(&dp->table);
1560 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1561 if (!dp->stats_percpu) {
1563 goto err_destroy_table;
1566 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1570 goto err_destroy_percpu;
1573 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1574 INIT_HLIST_HEAD(&dp->ports[i]);
1576 /* Set up our datapath device. */
1577 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1578 parms.type = OVS_VPORT_TYPE_INTERNAL;
1579 parms.options = NULL;
1581 parms.port_no = OVSP_LOCAL;
1582 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1584 ovs_dp_change(dp, a);
1586 /* So far only local changes have been made, now need the lock. */
1589 vport = new_vport(&parms);
1590 if (IS_ERR(vport)) {
1591 err = PTR_ERR(vport);
1595 if (err == -EEXIST) {
1596 /* An outdated user space instance that does not understand
1597 * the concept of user_features has attempted to create a new
1598 * datapath and is likely to reuse it. Drop all user features.
1600 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1601 ovs_dp_reset_user_features(skb, info);
1604 goto err_destroy_ports_array;
1607 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1608 info->snd_seq, 0, OVS_DP_CMD_NEW);
1611 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1612 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1616 ovs_notify(&dp_datapath_genl_family, reply, info);
1619 err_destroy_ports_array:
1623 free_percpu(dp->stats_percpu);
1625 ovs_flow_tbl_destroy(&dp->table);
1634 /* Called with ovs_mutex. */
1635 static void __dp_destroy(struct datapath *dp)
1639 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1640 struct vport *vport;
1641 struct hlist_node *n;
1643 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1644 if (vport->port_no != OVSP_LOCAL)
1645 ovs_dp_detach_port(vport);
1648 list_del_rcu(&dp->list_node);
1650 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1651 * all ports in datapath are destroyed first before freeing datapath.
1653 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1655 /* RCU destroy the flow table */
1656 call_rcu(&dp->rcu, destroy_dp_rcu);
1659 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1661 struct sk_buff *reply;
1662 struct datapath *dp;
1665 reply = ovs_dp_cmd_alloc_info(info);
1670 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1673 goto err_unlock_free;
1675 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1676 info->snd_seq, 0, OVS_DP_CMD_DEL);
1682 ovs_notify(&dp_datapath_genl_family, reply, info);
1692 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1694 struct sk_buff *reply;
1695 struct datapath *dp;
1698 reply = ovs_dp_cmd_alloc_info(info);
1703 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1706 goto err_unlock_free;
1708 ovs_dp_change(dp, info->attrs);
1710 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1711 info->snd_seq, 0, OVS_DP_CMD_NEW);
1715 ovs_notify(&dp_datapath_genl_family, reply, info);
1725 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1727 struct sk_buff *reply;
1728 struct datapath *dp;
1731 reply = ovs_dp_cmd_alloc_info(info);
1736 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1739 goto err_unlock_free;
1741 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1742 info->snd_seq, 0, OVS_DP_CMD_NEW);
1746 return genlmsg_reply(reply, info);
1754 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1756 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1757 struct datapath *dp;
1758 int skip = cb->args[0];
1762 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1764 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1765 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1766 OVS_DP_CMD_NEW) < 0)
1777 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1778 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1779 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1780 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1783 static const struct genl_ops dp_datapath_genl_ops[] = {
1784 { .cmd = OVS_DP_CMD_NEW,
1785 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1786 .policy = datapath_policy,
1787 .doit = ovs_dp_cmd_new
1789 { .cmd = OVS_DP_CMD_DEL,
1790 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1791 .policy = datapath_policy,
1792 .doit = ovs_dp_cmd_del
1794 { .cmd = OVS_DP_CMD_GET,
1795 .flags = 0, /* OK for unprivileged users. */
1796 .policy = datapath_policy,
1797 .doit = ovs_dp_cmd_get,
1798 .dumpit = ovs_dp_cmd_dump
1800 { .cmd = OVS_DP_CMD_SET,
1801 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1802 .policy = datapath_policy,
1803 .doit = ovs_dp_cmd_set,
1807 static struct genl_family dp_datapath_genl_family = {
1808 .id = GENL_ID_GENERATE,
1809 .hdrsize = sizeof(struct ovs_header),
1810 .name = OVS_DATAPATH_FAMILY,
1811 .version = OVS_DATAPATH_VERSION,
1812 .maxattr = OVS_DP_ATTR_MAX,
1814 .parallel_ops = true,
1815 .ops = dp_datapath_genl_ops,
1816 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1817 .mcgrps = &ovs_dp_datapath_multicast_group,
1821 /* Called with ovs_mutex or RCU read lock. */
1822 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1823 u32 portid, u32 seq, u32 flags, u8 cmd)
1825 struct ovs_header *ovs_header;
1826 struct ovs_vport_stats vport_stats;
1829 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1834 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1836 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1837 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1838 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1839 ovs_vport_name(vport)))
1840 goto nla_put_failure;
1842 ovs_vport_get_stats(vport, &vport_stats);
1843 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1845 goto nla_put_failure;
1847 if (ovs_vport_get_upcall_portids(vport, skb))
1848 goto nla_put_failure;
1850 err = ovs_vport_get_options(vport, skb);
1851 if (err == -EMSGSIZE)
1854 genlmsg_end(skb, ovs_header);
1860 genlmsg_cancel(skb, ovs_header);
1864 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1866 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1869 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1870 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1873 struct sk_buff *skb;
1876 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1878 return ERR_PTR(-ENOMEM);
1880 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1886 /* Called with ovs_mutex or RCU read lock. */
1887 static struct vport *lookup_vport(struct net *net,
1888 const struct ovs_header *ovs_header,
1889 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1891 struct datapath *dp;
1892 struct vport *vport;
1894 if (a[OVS_VPORT_ATTR_NAME]) {
1895 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1897 return ERR_PTR(-ENODEV);
1898 if (ovs_header->dp_ifindex &&
1899 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1900 return ERR_PTR(-ENODEV);
1902 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1903 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1905 if (port_no >= DP_MAX_PORTS)
1906 return ERR_PTR(-EFBIG);
1908 dp = get_dp(net, ovs_header->dp_ifindex);
1910 return ERR_PTR(-ENODEV);
1912 vport = ovs_vport_ovsl_rcu(dp, port_no);
1914 return ERR_PTR(-ENODEV);
1917 return ERR_PTR(-EINVAL);
1920 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1922 struct nlattr **a = info->attrs;
1923 struct ovs_header *ovs_header = info->userhdr;
1924 struct vport_parms parms;
1925 struct sk_buff *reply;
1926 struct vport *vport;
1927 struct datapath *dp;
1931 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1932 !a[OVS_VPORT_ATTR_UPCALL_PID])
1935 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1936 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1937 if (port_no >= DP_MAX_PORTS)
1940 reply = ovs_vport_cmd_alloc_info();
1946 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1949 goto exit_unlock_free;
1952 vport = ovs_vport_ovsl(dp, port_no);
1955 goto exit_unlock_free;
1957 for (port_no = 1; ; port_no++) {
1958 if (port_no >= DP_MAX_PORTS) {
1960 goto exit_unlock_free;
1962 vport = ovs_vport_ovsl(dp, port_no);
1968 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1969 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1970 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1972 parms.port_no = port_no;
1973 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1975 vport = new_vport(&parms);
1976 err = PTR_ERR(vport);
1977 if (IS_ERR(vport)) {
1980 goto exit_unlock_free;
1983 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1984 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1988 ovs_notify(&dp_vport_genl_family, reply, info);
1997 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1999 struct nlattr **a = info->attrs;
2000 struct sk_buff *reply;
2001 struct vport *vport;
2004 reply = ovs_vport_cmd_alloc_info();
2009 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2010 err = PTR_ERR(vport);
2012 goto exit_unlock_free;
2014 if (a[OVS_VPORT_ATTR_TYPE] &&
2015 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2017 goto exit_unlock_free;
2020 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2021 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2023 goto exit_unlock_free;
2027 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2028 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2030 err = ovs_vport_set_upcall_portids(vport, ids);
2032 goto exit_unlock_free;
2035 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2036 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2040 ovs_notify(&dp_vport_genl_family, reply, info);
2049 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2051 struct nlattr **a = info->attrs;
2052 struct sk_buff *reply;
2053 struct vport *vport;
2056 reply = ovs_vport_cmd_alloc_info();
2061 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2062 err = PTR_ERR(vport);
2064 goto exit_unlock_free;
2066 if (vport->port_no == OVSP_LOCAL) {
2068 goto exit_unlock_free;
2071 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2072 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2074 ovs_dp_detach_port(vport);
2077 ovs_notify(&dp_vport_genl_family, reply, info);
2086 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2088 struct nlattr **a = info->attrs;
2089 struct ovs_header *ovs_header = info->userhdr;
2090 struct sk_buff *reply;
2091 struct vport *vport;
2094 reply = ovs_vport_cmd_alloc_info();
2099 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2100 err = PTR_ERR(vport);
2102 goto exit_unlock_free;
2103 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2104 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2108 return genlmsg_reply(reply, info);
2116 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2118 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2119 struct datapath *dp;
2120 int bucket = cb->args[0], skip = cb->args[1];
2124 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2129 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2130 struct vport *vport;
2133 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2135 ovs_vport_cmd_fill_info(vport, skb,
2136 NETLINK_CB(cb->skb).portid,
2139 OVS_VPORT_CMD_NEW) < 0)
2155 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2156 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2157 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2158 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2159 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2160 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2161 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2164 static const struct genl_ops dp_vport_genl_ops[] = {
2165 { .cmd = OVS_VPORT_CMD_NEW,
2166 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2167 .policy = vport_policy,
2168 .doit = ovs_vport_cmd_new
2170 { .cmd = OVS_VPORT_CMD_DEL,
2171 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2172 .policy = vport_policy,
2173 .doit = ovs_vport_cmd_del
2175 { .cmd = OVS_VPORT_CMD_GET,
2176 .flags = 0, /* OK for unprivileged users. */
2177 .policy = vport_policy,
2178 .doit = ovs_vport_cmd_get,
2179 .dumpit = ovs_vport_cmd_dump
2181 { .cmd = OVS_VPORT_CMD_SET,
2182 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2183 .policy = vport_policy,
2184 .doit = ovs_vport_cmd_set,
2188 struct genl_family dp_vport_genl_family = {
2189 .id = GENL_ID_GENERATE,
2190 .hdrsize = sizeof(struct ovs_header),
2191 .name = OVS_VPORT_FAMILY,
2192 .version = OVS_VPORT_VERSION,
2193 .maxattr = OVS_VPORT_ATTR_MAX,
2195 .parallel_ops = true,
2196 .ops = dp_vport_genl_ops,
2197 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2198 .mcgrps = &ovs_dp_vport_multicast_group,
2202 static struct genl_family * const dp_genl_families[] = {
2203 &dp_datapath_genl_family,
2204 &dp_vport_genl_family,
2205 &dp_flow_genl_family,
2206 &dp_packet_genl_family,
2209 static void dp_unregister_genl(int n_families)
2213 for (i = 0; i < n_families; i++)
2214 genl_unregister_family(dp_genl_families[i]);
2217 static int dp_register_genl(void)
2222 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2224 err = genl_register_family(dp_genl_families[i]);
2232 dp_unregister_genl(i);
2236 static int __net_init ovs_init_net(struct net *net)
2238 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2240 INIT_LIST_HEAD(&ovs_net->dps);
2241 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2246 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2247 struct list_head *head)
2249 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2250 struct datapath *dp;
2252 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2255 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2256 struct vport *vport;
2258 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2259 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2262 if (dev_net(vport->dev) == dnet)
2263 list_add(&vport->detach_list, head);
2269 static void __net_exit ovs_exit_net(struct net *dnet)
2271 struct datapath *dp, *dp_next;
2272 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2273 struct vport *vport, *vport_next;
2279 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2284 list_vports_from_net(net, dnet, &head);
2287 /* Detach all vports from given namespace. */
2288 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2289 list_del(&vport->detach_list);
2290 ovs_dp_detach_port(vport);
2295 cancel_work_sync(&ovs_net->dp_notify_work);
2298 static struct pernet_operations ovs_net_ops = {
2299 .init = ovs_init_net,
2300 .exit = ovs_exit_net,
2302 .size = sizeof(struct ovs_net),
2305 static int __init dp_init(void)
2309 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2311 pr_info("Open vSwitch switching datapath\n");
2313 err = action_fifos_init();
2317 err = ovs_internal_dev_rtnl_link_register();
2319 goto error_action_fifos_exit;
2321 err = ovs_flow_init();
2323 goto error_unreg_rtnl_link;
2325 err = ovs_vport_init();
2327 goto error_flow_exit;
2329 err = register_pernet_device(&ovs_net_ops);
2331 goto error_vport_exit;
2333 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2335 goto error_netns_exit;
2337 err = ovs_netdev_init();
2339 goto error_unreg_notifier;
2341 err = dp_register_genl();
2343 goto error_unreg_netdev;
2349 error_unreg_notifier:
2350 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2352 unregister_pernet_device(&ovs_net_ops);
2357 error_unreg_rtnl_link:
2358 ovs_internal_dev_rtnl_link_unregister();
2359 error_action_fifos_exit:
2360 action_fifos_exit();
2365 static void dp_cleanup(void)
2367 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2369 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2370 unregister_pernet_device(&ovs_net_ops);
2374 ovs_internal_dev_rtnl_link_unregister();
2375 action_fifos_exit();
2378 module_init(dp_init);
2379 module_exit(dp_cleanup);
2381 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2382 MODULE_LICENSE("GPL");