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 *);
141 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
142 const struct sw_flow_key *,
143 const struct dp_upcall_info *);
145 /* Must be called with rcu_read_lock. */
146 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
148 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
151 struct vport *vport = ovs_internal_dev_get_vport(dev);
159 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
160 * returned dp pointer valid.
162 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
166 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
168 dp = get_dp_rcu(net, dp_ifindex);
174 /* Must be called with rcu_read_lock or ovs_mutex. */
175 const char *ovs_dp_name(const struct datapath *dp)
177 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
178 return ovs_vport_name(vport);
181 static int get_dpifindex(const struct datapath *dp)
188 local = ovs_vport_rcu(dp, OVSP_LOCAL);
190 ifindex = local->dev->ifindex;
199 static void destroy_dp_rcu(struct rcu_head *rcu)
201 struct datapath *dp = container_of(rcu, struct datapath, rcu);
203 ovs_flow_tbl_destroy(&dp->table);
204 free_percpu(dp->stats_percpu);
209 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
212 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
215 /* Called with ovs_mutex or RCU read lock. */
216 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
219 struct hlist_head *head;
221 head = vport_hash_bucket(dp, port_no);
222 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
223 if (vport->port_no == port_no)
229 /* Called with ovs_mutex. */
230 static struct vport *new_vport(const struct vport_parms *parms)
234 vport = ovs_vport_add(parms);
235 if (!IS_ERR(vport)) {
236 struct datapath *dp = parms->dp;
237 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
239 hlist_add_head_rcu(&vport->dp_hash_node, head);
244 void ovs_dp_detach_port(struct vport *p)
248 /* First drop references to device. */
249 hlist_del_rcu(&p->dp_hash_node);
251 /* Then destroy it. */
255 /* Must be called with rcu_read_lock. */
256 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
258 const struct vport *p = OVS_CB(skb)->input_vport;
259 struct datapath *dp = p->dp;
260 struct sw_flow *flow;
261 struct sw_flow_actions *sf_acts;
262 struct dp_stats_percpu *stats;
266 stats = this_cpu_ptr(dp->stats_percpu);
269 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
270 if (unlikely(!flow)) {
271 struct dp_upcall_info upcall;
274 memset(&upcall, 0, sizeof(upcall));
275 upcall.cmd = OVS_PACKET_CMD_MISS;
276 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
277 upcall.mru = OVS_CB(skb)->mru;
278 error = ovs_dp_upcall(dp, skb, key, &upcall);
283 stats_counter = &stats->n_missed;
287 ovs_flow_stats_update(flow, key->tp.flags, skb);
288 sf_acts = rcu_dereference(flow->sf_acts);
289 ovs_execute_actions(dp, skb, sf_acts, key);
291 stats_counter = &stats->n_hit;
294 /* Update datapath statistics. */
295 u64_stats_update_begin(&stats->syncp);
297 stats->n_mask_hit += n_mask_hit;
298 u64_stats_update_end(&stats->syncp);
301 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
302 const struct sw_flow_key *key,
303 const struct dp_upcall_info *upcall_info)
305 struct dp_stats_percpu *stats;
308 if (upcall_info->portid == 0) {
313 if (!skb_is_gso(skb))
314 err = queue_userspace_packet(dp, skb, key, upcall_info);
316 err = queue_gso_packets(dp, skb, key, upcall_info);
323 stats = this_cpu_ptr(dp->stats_percpu);
325 u64_stats_update_begin(&stats->syncp);
327 u64_stats_update_end(&stats->syncp);
332 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
333 const struct sw_flow_key *key,
334 const struct dp_upcall_info *upcall_info)
336 unsigned short gso_type = skb_shinfo(skb)->gso_type;
337 struct sw_flow_key later_key;
338 struct sk_buff *segs, *nskb;
339 struct ovs_skb_cb ovs_cb;
342 ovs_cb = *OVS_CB(skb);
343 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
344 *OVS_CB(skb) = ovs_cb;
346 return PTR_ERR(segs);
350 if (gso_type & SKB_GSO_UDP) {
351 /* The initial flow key extracted by ovs_flow_key_extract()
352 * in this case is for a first fragment, so we need to
353 * properly mark later fragments.
356 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
359 /* Queue all of the segments. */
362 *OVS_CB(skb) = ovs_cb;
363 if (gso_type & SKB_GSO_UDP && skb != segs)
366 err = queue_userspace_packet(dp, skb, key, upcall_info);
370 } while ((skb = skb->next));
372 /* Free all of the segments. */
380 } while ((skb = nskb));
384 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
387 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
388 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
389 + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */
391 /* OVS_PACKET_ATTR_USERDATA */
392 if (upcall_info->userdata)
393 size += NLA_ALIGN(upcall_info->userdata->nla_len);
395 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
396 if (upcall_info->egress_tun_info)
397 size += nla_total_size(ovs_tun_key_attr_size());
399 /* OVS_PACKET_ATTR_ACTIONS */
400 if (upcall_info->actions_len)
401 size += nla_total_size(upcall_info->actions_len);
403 /* OVS_PACKET_ATTR_MRU */
404 if (upcall_info->mru)
405 size += nla_total_size(sizeof(upcall_info->mru));
410 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
412 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
413 size_t plen = NLA_ALIGN(skb->len) - skb->len;
416 memset(skb_put(skb, plen), 0, plen);
420 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
421 const struct sw_flow_key *key,
422 const struct dp_upcall_info *upcall_info)
424 struct ovs_header *upcall;
425 struct sk_buff *nskb = NULL;
426 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
428 struct genl_info info = {
429 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
430 .snd_portid = upcall_info->portid,
436 dp_ifindex = get_dpifindex(dp);
440 if (skb_vlan_tag_present(skb)) {
441 nskb = skb_clone(skb, GFP_ATOMIC);
445 nskb = __vlan_hwaccel_push_inside(nskb);
452 if (nla_attr_size(skb->len) > USHRT_MAX) {
457 /* Complete checksum if needed */
458 if (skb->ip_summed == CHECKSUM_PARTIAL &&
459 (err = skb_checksum_help(skb)))
462 /* Older versions of OVS user space enforce alignment of the last
463 * Netlink attribute to NLA_ALIGNTO which would require extensive
464 * padding logic. Only perform zerocopy if padding is not required.
466 if (dp->user_features & OVS_DP_F_UNALIGNED)
467 hlen = skb_zerocopy_headlen(skb);
471 len = upcall_msg_size(upcall_info, hlen);
472 user_skb = genlmsg_new_unicast(len, &info, 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 /* Only reserve room for attribute header, packet data is added
520 * in skb_zerocopy() */
521 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
525 nla->nla_len = nla_attr_size(skb->len);
527 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
531 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
532 pad_packet(dp, user_skb);
534 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
536 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
546 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
548 struct ovs_header *ovs_header = info->userhdr;
549 struct net *net = sock_net(skb->sk);
550 struct nlattr **a = info->attrs;
551 struct sw_flow_actions *acts;
552 struct sk_buff *packet;
553 struct sw_flow *flow;
554 struct sw_flow_actions *sf_acts;
557 struct vport *input_vport;
561 bool log = !a[OVS_PACKET_ATTR_PROBE];
564 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
565 !a[OVS_PACKET_ATTR_ACTIONS])
568 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
569 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
573 skb_reserve(packet, NET_IP_ALIGN);
575 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
577 skb_reset_mac_header(packet);
578 eth = eth_hdr(packet);
580 /* Normally, setting the skb 'protocol' field would be handled by a
581 * call to eth_type_trans(), but it assumes there's a sending
582 * device, which we may not have. */
583 if (eth_proto_is_802_3(eth->h_proto))
584 packet->protocol = eth->h_proto;
586 packet->protocol = htons(ETH_P_802_2);
588 /* Set packet's mru */
589 if (a[OVS_PACKET_ATTR_MRU]) {
590 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
591 packet->ignore_df = 1;
593 OVS_CB(packet)->mru = mru;
595 /* Build an sw_flow for sending this packet. */
596 flow = ovs_flow_alloc();
601 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
602 packet, &flow->key, log);
606 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
607 &flow->key, &acts, log);
611 rcu_assign_pointer(flow->sf_acts, acts);
612 packet->priority = flow->key.phy.priority;
613 packet->mark = flow->key.phy.skb_mark;
616 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
621 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
623 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
628 packet->dev = input_vport->dev;
629 OVS_CB(packet)->input_vport = input_vport;
630 sf_acts = rcu_dereference(flow->sf_acts);
633 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
637 ovs_flow_free(flow, false);
643 ovs_flow_free(flow, false);
650 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
651 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
652 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
653 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
654 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
655 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
658 static const struct genl_ops dp_packet_genl_ops[] = {
659 { .cmd = OVS_PACKET_CMD_EXECUTE,
660 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
661 .policy = packet_policy,
662 .doit = ovs_packet_cmd_execute
666 static struct genl_family dp_packet_genl_family = {
667 .id = GENL_ID_GENERATE,
668 .hdrsize = sizeof(struct ovs_header),
669 .name = OVS_PACKET_FAMILY,
670 .version = OVS_PACKET_VERSION,
671 .maxattr = OVS_PACKET_ATTR_MAX,
673 .parallel_ops = true,
674 .ops = dp_packet_genl_ops,
675 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
678 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
679 struct ovs_dp_megaflow_stats *mega_stats)
683 memset(mega_stats, 0, sizeof(*mega_stats));
685 stats->n_flows = ovs_flow_tbl_count(&dp->table);
686 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
688 stats->n_hit = stats->n_missed = stats->n_lost = 0;
690 for_each_possible_cpu(i) {
691 const struct dp_stats_percpu *percpu_stats;
692 struct dp_stats_percpu local_stats;
695 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
698 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
699 local_stats = *percpu_stats;
700 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
702 stats->n_hit += local_stats.n_hit;
703 stats->n_missed += local_stats.n_missed;
704 stats->n_lost += local_stats.n_lost;
705 mega_stats->n_mask_hit += local_stats.n_mask_hit;
709 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
711 return ovs_identifier_is_ufid(sfid) &&
712 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
715 static bool should_fill_mask(uint32_t ufid_flags)
717 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
720 static bool should_fill_actions(uint32_t ufid_flags)
722 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
725 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
726 const struct sw_flow_id *sfid,
729 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
731 /* OVS_FLOW_ATTR_UFID */
732 if (sfid && ovs_identifier_is_ufid(sfid))
733 len += nla_total_size(sfid->ufid_len);
735 /* OVS_FLOW_ATTR_KEY */
736 if (!sfid || should_fill_key(sfid, ufid_flags))
737 len += nla_total_size(ovs_key_attr_size());
739 /* OVS_FLOW_ATTR_MASK */
740 if (should_fill_mask(ufid_flags))
741 len += nla_total_size(ovs_key_attr_size());
743 /* OVS_FLOW_ATTR_ACTIONS */
744 if (should_fill_actions(ufid_flags))
745 len += nla_total_size(acts->orig_len);
748 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
749 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
750 + nla_total_size(8); /* OVS_FLOW_ATTR_USED */
753 /* Called with ovs_mutex or RCU read lock. */
754 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
757 struct ovs_flow_stats stats;
761 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
764 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
767 if (stats.n_packets &&
768 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
771 if ((u8)ntohs(tcp_flags) &&
772 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
778 /* Called with ovs_mutex or RCU read lock. */
779 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
780 struct sk_buff *skb, int skb_orig_len)
782 struct nlattr *start;
785 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
786 * this is the first flow to be dumped into 'skb'. This is unusual for
787 * Netlink but individual action lists can be longer than
788 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
789 * The userspace caller can always fetch the actions separately if it
790 * really wants them. (Most userspace callers in fact don't care.)
792 * This can only fail for dump operations because the skb is always
793 * properly sized for single flows.
795 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
797 const struct sw_flow_actions *sf_acts;
799 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
800 err = ovs_nla_put_actions(sf_acts->actions,
801 sf_acts->actions_len, skb);
804 nla_nest_end(skb, start);
809 nla_nest_cancel(skb, start);
811 } else if (skb_orig_len) {
818 /* Called with ovs_mutex or RCU read lock. */
819 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
820 struct sk_buff *skb, u32 portid,
821 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
823 const int skb_orig_len = skb->len;
824 struct ovs_header *ovs_header;
827 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
832 ovs_header->dp_ifindex = dp_ifindex;
834 err = ovs_nla_put_identifier(flow, skb);
838 if (should_fill_key(&flow->id, ufid_flags)) {
839 err = ovs_nla_put_masked_key(flow, skb);
844 if (should_fill_mask(ufid_flags)) {
845 err = ovs_nla_put_mask(flow, skb);
850 err = ovs_flow_cmd_fill_stats(flow, skb);
854 if (should_fill_actions(ufid_flags)) {
855 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
860 genlmsg_end(skb, ovs_header);
864 genlmsg_cancel(skb, ovs_header);
868 /* May not be called with RCU read lock. */
869 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
870 const struct sw_flow_id *sfid,
871 struct genl_info *info,
878 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
881 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
882 skb = genlmsg_new_unicast(len, info, GFP_KERNEL);
884 return ERR_PTR(-ENOMEM);
889 /* Called with ovs_mutex. */
890 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
892 struct genl_info *info, u8 cmd,
893 bool always, u32 ufid_flags)
898 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
899 &flow->id, info, always, ufid_flags);
900 if (IS_ERR_OR_NULL(skb))
903 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
904 info->snd_portid, info->snd_seq, 0,
910 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
912 struct net *net = sock_net(skb->sk);
913 struct nlattr **a = info->attrs;
914 struct ovs_header *ovs_header = info->userhdr;
915 struct sw_flow *flow = NULL, *new_flow;
916 struct sw_flow_mask mask;
917 struct sk_buff *reply;
919 struct sw_flow_key key;
920 struct sw_flow_actions *acts;
921 struct sw_flow_match match;
922 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
924 bool log = !a[OVS_FLOW_ATTR_PROBE];
926 /* Must have key and actions. */
928 if (!a[OVS_FLOW_ATTR_KEY]) {
929 OVS_NLERR(log, "Flow key attr not present in new flow.");
932 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
933 OVS_NLERR(log, "Flow actions attr not present in new flow.");
937 /* Most of the time we need to allocate a new flow, do it before
940 new_flow = ovs_flow_alloc();
941 if (IS_ERR(new_flow)) {
942 error = PTR_ERR(new_flow);
947 ovs_match_init(&match, &key, &mask);
948 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
949 a[OVS_FLOW_ATTR_MASK], log);
953 ovs_flow_mask_key(&new_flow->key, &key, true, &mask);
955 /* Extract flow identifier. */
956 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
961 /* Validate actions. */
962 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
963 &new_flow->key, &acts, log);
965 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
969 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
972 error = PTR_ERR(reply);
977 dp = get_dp(net, ovs_header->dp_ifindex);
983 /* Check if this is a duplicate flow */
984 if (ovs_identifier_is_ufid(&new_flow->id))
985 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
987 flow = ovs_flow_tbl_lookup(&dp->table, &key);
989 rcu_assign_pointer(new_flow->sf_acts, acts);
991 /* Put flow in bucket. */
992 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
993 if (unlikely(error)) {
998 if (unlikely(reply)) {
999 error = ovs_flow_cmd_fill_info(new_flow,
1000 ovs_header->dp_ifindex,
1001 reply, info->snd_portid,
1009 struct sw_flow_actions *old_acts;
1011 /* Bail out if we're not allowed to modify an existing flow.
1012 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1013 * because Generic Netlink treats the latter as a dump
1014 * request. We also accept NLM_F_EXCL in case that bug ever
1017 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1020 goto err_unlock_ovs;
1022 /* The flow identifier has to be the same for flow updates.
1023 * Look for any overlapping flow.
1025 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1026 if (ovs_identifier_is_key(&flow->id))
1027 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1029 else /* UFID matches but key is different */
1033 goto err_unlock_ovs;
1036 /* Update actions. */
1037 old_acts = ovsl_dereference(flow->sf_acts);
1038 rcu_assign_pointer(flow->sf_acts, acts);
1040 if (unlikely(reply)) {
1041 error = ovs_flow_cmd_fill_info(flow,
1042 ovs_header->dp_ifindex,
1043 reply, info->snd_portid,
1051 ovs_nla_free_flow_actions_rcu(old_acts);
1052 ovs_flow_free(new_flow, false);
1056 ovs_notify(&dp_flow_genl_family, reply, info);
1063 ovs_nla_free_flow_actions(acts);
1065 ovs_flow_free(new_flow, false);
1070 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1071 static struct sw_flow_actions *get_flow_actions(struct net *net,
1072 const struct nlattr *a,
1073 const struct sw_flow_key *key,
1074 const struct sw_flow_mask *mask,
1077 struct sw_flow_actions *acts;
1078 struct sw_flow_key masked_key;
1081 ovs_flow_mask_key(&masked_key, key, true, mask);
1082 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1085 "Actions may not be safe on all matching packets");
1086 return ERR_PTR(error);
1092 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1094 struct net *net = sock_net(skb->sk);
1095 struct nlattr **a = info->attrs;
1096 struct ovs_header *ovs_header = info->userhdr;
1097 struct sw_flow_key key;
1098 struct sw_flow *flow;
1099 struct sw_flow_mask mask;
1100 struct sk_buff *reply = NULL;
1101 struct datapath *dp;
1102 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1103 struct sw_flow_match match;
1104 struct sw_flow_id sfid;
1105 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1107 bool log = !a[OVS_FLOW_ATTR_PROBE];
1112 if (!a[OVS_FLOW_ATTR_KEY]) {
1113 OVS_NLERR(log, "Flow key attribute not present in set flow.");
1117 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1118 ovs_match_init(&match, &key, &mask);
1119 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1120 a[OVS_FLOW_ATTR_MASK], log);
1124 /* Validate actions. */
1125 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1126 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key,
1129 error = PTR_ERR(acts);
1133 /* Can allocate before locking if have acts. */
1134 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1136 if (IS_ERR(reply)) {
1137 error = PTR_ERR(reply);
1138 goto err_kfree_acts;
1143 dp = get_dp(net, ovs_header->dp_ifindex);
1144 if (unlikely(!dp)) {
1146 goto err_unlock_ovs;
1148 /* Check that the flow exists. */
1150 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1152 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1153 if (unlikely(!flow)) {
1155 goto err_unlock_ovs;
1158 /* Update actions, if present. */
1160 old_acts = ovsl_dereference(flow->sf_acts);
1161 rcu_assign_pointer(flow->sf_acts, acts);
1163 if (unlikely(reply)) {
1164 error = ovs_flow_cmd_fill_info(flow,
1165 ovs_header->dp_ifindex,
1166 reply, info->snd_portid,
1173 /* Could not alloc without acts before locking. */
1174 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1175 info, OVS_FLOW_CMD_NEW, false,
1178 if (unlikely(IS_ERR(reply))) {
1179 error = PTR_ERR(reply);
1180 goto err_unlock_ovs;
1185 if (a[OVS_FLOW_ATTR_CLEAR])
1186 ovs_flow_stats_clear(flow);
1190 ovs_notify(&dp_flow_genl_family, reply, info);
1192 ovs_nla_free_flow_actions_rcu(old_acts);
1200 ovs_nla_free_flow_actions(acts);
1205 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1207 struct nlattr **a = info->attrs;
1208 struct ovs_header *ovs_header = info->userhdr;
1209 struct net *net = sock_net(skb->sk);
1210 struct sw_flow_key key;
1211 struct sk_buff *reply;
1212 struct sw_flow *flow;
1213 struct datapath *dp;
1214 struct sw_flow_match match;
1215 struct sw_flow_id ufid;
1216 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1218 bool log = !a[OVS_FLOW_ATTR_PROBE];
1221 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1222 if (a[OVS_FLOW_ATTR_KEY]) {
1223 ovs_match_init(&match, &key, NULL);
1224 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1226 } else if (!ufid_present) {
1228 "Flow get message rejected, Key attribute missing.");
1235 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1242 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1244 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1250 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1251 OVS_FLOW_CMD_NEW, true, ufid_flags);
1252 if (IS_ERR(reply)) {
1253 err = PTR_ERR(reply);
1258 return genlmsg_reply(reply, info);
1264 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1266 struct nlattr **a = info->attrs;
1267 struct ovs_header *ovs_header = info->userhdr;
1268 struct net *net = sock_net(skb->sk);
1269 struct sw_flow_key key;
1270 struct sk_buff *reply;
1271 struct sw_flow *flow = NULL;
1272 struct datapath *dp;
1273 struct sw_flow_match match;
1274 struct sw_flow_id ufid;
1275 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1277 bool log = !a[OVS_FLOW_ATTR_PROBE];
1280 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1281 if (a[OVS_FLOW_ATTR_KEY]) {
1282 ovs_match_init(&match, &key, NULL);
1283 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1290 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1291 if (unlikely(!dp)) {
1296 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1297 err = ovs_flow_tbl_flush(&dp->table);
1302 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1304 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1305 if (unlikely(!flow)) {
1310 ovs_flow_tbl_remove(&dp->table, flow);
1313 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1314 &flow->id, info, false, ufid_flags);
1315 if (likely(reply)) {
1316 if (likely(!IS_ERR(reply))) {
1317 rcu_read_lock(); /*To keep RCU checker happy. */
1318 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1319 reply, info->snd_portid,
1326 ovs_notify(&dp_flow_genl_family, reply, info);
1328 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1332 ovs_flow_free(flow, true);
1339 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1341 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1342 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1343 struct table_instance *ti;
1344 struct datapath *dp;
1348 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1349 OVS_FLOW_ATTR_MAX, flow_policy);
1352 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1355 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1361 ti = rcu_dereference(dp->table.ti);
1363 struct sw_flow *flow;
1366 bucket = cb->args[0];
1368 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1372 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1373 NETLINK_CB(cb->skb).portid,
1374 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1375 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1378 cb->args[0] = bucket;
1385 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1386 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1387 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1388 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1389 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1390 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1391 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1392 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1395 static const struct genl_ops dp_flow_genl_ops[] = {
1396 { .cmd = OVS_FLOW_CMD_NEW,
1397 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1398 .policy = flow_policy,
1399 .doit = ovs_flow_cmd_new
1401 { .cmd = OVS_FLOW_CMD_DEL,
1402 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1403 .policy = flow_policy,
1404 .doit = ovs_flow_cmd_del
1406 { .cmd = OVS_FLOW_CMD_GET,
1407 .flags = 0, /* OK for unprivileged users. */
1408 .policy = flow_policy,
1409 .doit = ovs_flow_cmd_get,
1410 .dumpit = ovs_flow_cmd_dump
1412 { .cmd = OVS_FLOW_CMD_SET,
1413 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1414 .policy = flow_policy,
1415 .doit = ovs_flow_cmd_set,
1419 static struct genl_family dp_flow_genl_family = {
1420 .id = GENL_ID_GENERATE,
1421 .hdrsize = sizeof(struct ovs_header),
1422 .name = OVS_FLOW_FAMILY,
1423 .version = OVS_FLOW_VERSION,
1424 .maxattr = OVS_FLOW_ATTR_MAX,
1426 .parallel_ops = true,
1427 .ops = dp_flow_genl_ops,
1428 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1429 .mcgrps = &ovs_dp_flow_multicast_group,
1433 static size_t ovs_dp_cmd_msg_size(void)
1435 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1437 msgsize += nla_total_size(IFNAMSIZ);
1438 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1439 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1440 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1445 /* Called with ovs_mutex. */
1446 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1447 u32 portid, u32 seq, u32 flags, u8 cmd)
1449 struct ovs_header *ovs_header;
1450 struct ovs_dp_stats dp_stats;
1451 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1454 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1459 ovs_header->dp_ifindex = get_dpifindex(dp);
1461 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1463 goto nla_put_failure;
1465 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1466 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1468 goto nla_put_failure;
1470 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1471 sizeof(struct ovs_dp_megaflow_stats),
1472 &dp_megaflow_stats))
1473 goto nla_put_failure;
1475 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1476 goto nla_put_failure;
1478 genlmsg_end(skb, ovs_header);
1482 genlmsg_cancel(skb, ovs_header);
1487 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1489 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1492 /* Called with rcu_read_lock or ovs_mutex. */
1493 static struct datapath *lookup_datapath(struct net *net,
1494 const struct ovs_header *ovs_header,
1495 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1497 struct datapath *dp;
1499 if (!a[OVS_DP_ATTR_NAME])
1500 dp = get_dp(net, ovs_header->dp_ifindex);
1502 struct vport *vport;
1504 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1505 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1507 return dp ? dp : ERR_PTR(-ENODEV);
1510 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1512 struct datapath *dp;
1514 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1518 WARN(dp->user_features, "Dropping previously announced user features\n");
1519 dp->user_features = 0;
1522 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1524 if (a[OVS_DP_ATTR_USER_FEATURES])
1525 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1528 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1530 struct nlattr **a = info->attrs;
1531 struct vport_parms parms;
1532 struct sk_buff *reply;
1533 struct datapath *dp;
1534 struct vport *vport;
1535 struct ovs_net *ovs_net;
1539 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1542 reply = ovs_dp_cmd_alloc_info(info);
1547 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1549 goto err_free_reply;
1551 ovs_dp_set_net(dp, sock_net(skb->sk));
1553 /* Allocate table. */
1554 err = ovs_flow_tbl_init(&dp->table);
1558 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1559 if (!dp->stats_percpu) {
1561 goto err_destroy_table;
1564 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1568 goto err_destroy_percpu;
1571 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1572 INIT_HLIST_HEAD(&dp->ports[i]);
1574 /* Set up our datapath device. */
1575 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1576 parms.type = OVS_VPORT_TYPE_INTERNAL;
1577 parms.options = NULL;
1579 parms.port_no = OVSP_LOCAL;
1580 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1582 ovs_dp_change(dp, a);
1584 /* So far only local changes have been made, now need the lock. */
1587 vport = new_vport(&parms);
1588 if (IS_ERR(vport)) {
1589 err = PTR_ERR(vport);
1593 if (err == -EEXIST) {
1594 /* An outdated user space instance that does not understand
1595 * the concept of user_features has attempted to create a new
1596 * datapath and is likely to reuse it. Drop all user features.
1598 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1599 ovs_dp_reset_user_features(skb, info);
1602 goto err_destroy_ports_array;
1605 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1606 info->snd_seq, 0, OVS_DP_CMD_NEW);
1609 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1610 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1614 ovs_notify(&dp_datapath_genl_family, reply, info);
1617 err_destroy_ports_array:
1621 free_percpu(dp->stats_percpu);
1623 ovs_flow_tbl_destroy(&dp->table);
1632 /* Called with ovs_mutex. */
1633 static void __dp_destroy(struct datapath *dp)
1637 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1638 struct vport *vport;
1639 struct hlist_node *n;
1641 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1642 if (vport->port_no != OVSP_LOCAL)
1643 ovs_dp_detach_port(vport);
1646 list_del_rcu(&dp->list_node);
1648 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1649 * all ports in datapath are destroyed first before freeing datapath.
1651 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1653 /* RCU destroy the flow table */
1654 call_rcu(&dp->rcu, destroy_dp_rcu);
1657 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1659 struct sk_buff *reply;
1660 struct datapath *dp;
1663 reply = ovs_dp_cmd_alloc_info(info);
1668 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1671 goto err_unlock_free;
1673 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1674 info->snd_seq, 0, OVS_DP_CMD_DEL);
1680 ovs_notify(&dp_datapath_genl_family, reply, info);
1690 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1692 struct sk_buff *reply;
1693 struct datapath *dp;
1696 reply = ovs_dp_cmd_alloc_info(info);
1701 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1704 goto err_unlock_free;
1706 ovs_dp_change(dp, info->attrs);
1708 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1709 info->snd_seq, 0, OVS_DP_CMD_NEW);
1713 ovs_notify(&dp_datapath_genl_family, reply, info);
1723 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1725 struct sk_buff *reply;
1726 struct datapath *dp;
1729 reply = ovs_dp_cmd_alloc_info(info);
1734 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1737 goto err_unlock_free;
1739 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1740 info->snd_seq, 0, OVS_DP_CMD_NEW);
1744 return genlmsg_reply(reply, info);
1752 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1754 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1755 struct datapath *dp;
1756 int skip = cb->args[0];
1760 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1762 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1763 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1764 OVS_DP_CMD_NEW) < 0)
1775 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1776 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1777 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1778 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1781 static const struct genl_ops dp_datapath_genl_ops[] = {
1782 { .cmd = OVS_DP_CMD_NEW,
1783 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1784 .policy = datapath_policy,
1785 .doit = ovs_dp_cmd_new
1787 { .cmd = OVS_DP_CMD_DEL,
1788 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1789 .policy = datapath_policy,
1790 .doit = ovs_dp_cmd_del
1792 { .cmd = OVS_DP_CMD_GET,
1793 .flags = 0, /* OK for unprivileged users. */
1794 .policy = datapath_policy,
1795 .doit = ovs_dp_cmd_get,
1796 .dumpit = ovs_dp_cmd_dump
1798 { .cmd = OVS_DP_CMD_SET,
1799 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1800 .policy = datapath_policy,
1801 .doit = ovs_dp_cmd_set,
1805 static struct genl_family dp_datapath_genl_family = {
1806 .id = GENL_ID_GENERATE,
1807 .hdrsize = sizeof(struct ovs_header),
1808 .name = OVS_DATAPATH_FAMILY,
1809 .version = OVS_DATAPATH_VERSION,
1810 .maxattr = OVS_DP_ATTR_MAX,
1812 .parallel_ops = true,
1813 .ops = dp_datapath_genl_ops,
1814 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1815 .mcgrps = &ovs_dp_datapath_multicast_group,
1819 /* Called with ovs_mutex or RCU read lock. */
1820 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1821 u32 portid, u32 seq, u32 flags, u8 cmd)
1823 struct ovs_header *ovs_header;
1824 struct ovs_vport_stats vport_stats;
1827 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1832 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1834 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1835 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1836 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1837 ovs_vport_name(vport)))
1838 goto nla_put_failure;
1840 ovs_vport_get_stats(vport, &vport_stats);
1841 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1843 goto nla_put_failure;
1845 if (ovs_vport_get_upcall_portids(vport, skb))
1846 goto nla_put_failure;
1848 err = ovs_vport_get_options(vport, skb);
1849 if (err == -EMSGSIZE)
1852 genlmsg_end(skb, ovs_header);
1858 genlmsg_cancel(skb, ovs_header);
1862 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1864 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1867 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1868 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1871 struct sk_buff *skb;
1874 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1876 return ERR_PTR(-ENOMEM);
1878 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1884 /* Called with ovs_mutex or RCU read lock. */
1885 static struct vport *lookup_vport(struct net *net,
1886 const struct ovs_header *ovs_header,
1887 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1889 struct datapath *dp;
1890 struct vport *vport;
1892 if (a[OVS_VPORT_ATTR_NAME]) {
1893 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1895 return ERR_PTR(-ENODEV);
1896 if (ovs_header->dp_ifindex &&
1897 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1898 return ERR_PTR(-ENODEV);
1900 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1901 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1903 if (port_no >= DP_MAX_PORTS)
1904 return ERR_PTR(-EFBIG);
1906 dp = get_dp(net, ovs_header->dp_ifindex);
1908 return ERR_PTR(-ENODEV);
1910 vport = ovs_vport_ovsl_rcu(dp, port_no);
1912 return ERR_PTR(-ENODEV);
1915 return ERR_PTR(-EINVAL);
1918 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1920 struct nlattr **a = info->attrs;
1921 struct ovs_header *ovs_header = info->userhdr;
1922 struct vport_parms parms;
1923 struct sk_buff *reply;
1924 struct vport *vport;
1925 struct datapath *dp;
1929 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1930 !a[OVS_VPORT_ATTR_UPCALL_PID])
1933 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1934 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1935 if (port_no >= DP_MAX_PORTS)
1938 reply = ovs_vport_cmd_alloc_info();
1944 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1947 goto exit_unlock_free;
1950 vport = ovs_vport_ovsl(dp, port_no);
1953 goto exit_unlock_free;
1955 for (port_no = 1; ; port_no++) {
1956 if (port_no >= DP_MAX_PORTS) {
1958 goto exit_unlock_free;
1960 vport = ovs_vport_ovsl(dp, port_no);
1966 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1967 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1968 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1970 parms.port_no = port_no;
1971 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1973 vport = new_vport(&parms);
1974 err = PTR_ERR(vport);
1975 if (IS_ERR(vport)) {
1978 goto exit_unlock_free;
1981 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1982 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1986 ovs_notify(&dp_vport_genl_family, reply, info);
1995 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1997 struct nlattr **a = info->attrs;
1998 struct sk_buff *reply;
1999 struct vport *vport;
2002 reply = ovs_vport_cmd_alloc_info();
2007 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2008 err = PTR_ERR(vport);
2010 goto exit_unlock_free;
2012 if (a[OVS_VPORT_ATTR_TYPE] &&
2013 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2015 goto exit_unlock_free;
2018 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2019 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2021 goto exit_unlock_free;
2025 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2026 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2028 err = ovs_vport_set_upcall_portids(vport, ids);
2030 goto exit_unlock_free;
2033 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2034 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2038 ovs_notify(&dp_vport_genl_family, reply, info);
2047 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2049 struct nlattr **a = info->attrs;
2050 struct sk_buff *reply;
2051 struct vport *vport;
2054 reply = ovs_vport_cmd_alloc_info();
2059 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2060 err = PTR_ERR(vport);
2062 goto exit_unlock_free;
2064 if (vport->port_no == OVSP_LOCAL) {
2066 goto exit_unlock_free;
2069 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2070 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2072 ovs_dp_detach_port(vport);
2075 ovs_notify(&dp_vport_genl_family, reply, info);
2084 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2086 struct nlattr **a = info->attrs;
2087 struct ovs_header *ovs_header = info->userhdr;
2088 struct sk_buff *reply;
2089 struct vport *vport;
2092 reply = ovs_vport_cmd_alloc_info();
2097 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2098 err = PTR_ERR(vport);
2100 goto exit_unlock_free;
2101 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2102 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2106 return genlmsg_reply(reply, info);
2114 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2116 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2117 struct datapath *dp;
2118 int bucket = cb->args[0], skip = cb->args[1];
2122 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2127 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2128 struct vport *vport;
2131 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2133 ovs_vport_cmd_fill_info(vport, skb,
2134 NETLINK_CB(cb->skb).portid,
2137 OVS_VPORT_CMD_NEW) < 0)
2153 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2154 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2155 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2156 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2157 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2158 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2159 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2162 static const struct genl_ops dp_vport_genl_ops[] = {
2163 { .cmd = OVS_VPORT_CMD_NEW,
2164 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2165 .policy = vport_policy,
2166 .doit = ovs_vport_cmd_new
2168 { .cmd = OVS_VPORT_CMD_DEL,
2169 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2170 .policy = vport_policy,
2171 .doit = ovs_vport_cmd_del
2173 { .cmd = OVS_VPORT_CMD_GET,
2174 .flags = 0, /* OK for unprivileged users. */
2175 .policy = vport_policy,
2176 .doit = ovs_vport_cmd_get,
2177 .dumpit = ovs_vport_cmd_dump
2179 { .cmd = OVS_VPORT_CMD_SET,
2180 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2181 .policy = vport_policy,
2182 .doit = ovs_vport_cmd_set,
2186 struct genl_family dp_vport_genl_family = {
2187 .id = GENL_ID_GENERATE,
2188 .hdrsize = sizeof(struct ovs_header),
2189 .name = OVS_VPORT_FAMILY,
2190 .version = OVS_VPORT_VERSION,
2191 .maxattr = OVS_VPORT_ATTR_MAX,
2193 .parallel_ops = true,
2194 .ops = dp_vport_genl_ops,
2195 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2196 .mcgrps = &ovs_dp_vport_multicast_group,
2200 static struct genl_family * const dp_genl_families[] = {
2201 &dp_datapath_genl_family,
2202 &dp_vport_genl_family,
2203 &dp_flow_genl_family,
2204 &dp_packet_genl_family,
2207 static void dp_unregister_genl(int n_families)
2211 for (i = 0; i < n_families; i++)
2212 genl_unregister_family(dp_genl_families[i]);
2215 static int dp_register_genl(void)
2220 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2222 err = genl_register_family(dp_genl_families[i]);
2230 dp_unregister_genl(i);
2234 static int __net_init ovs_init_net(struct net *net)
2236 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2238 INIT_LIST_HEAD(&ovs_net->dps);
2239 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2244 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2245 struct list_head *head)
2247 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2248 struct datapath *dp;
2250 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2253 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2254 struct vport *vport;
2256 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2257 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2260 if (dev_net(vport->dev) == dnet)
2261 list_add(&vport->detach_list, head);
2267 static void __net_exit ovs_exit_net(struct net *dnet)
2269 struct datapath *dp, *dp_next;
2270 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2271 struct vport *vport, *vport_next;
2277 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2282 list_vports_from_net(net, dnet, &head);
2285 /* Detach all vports from given namespace. */
2286 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2287 list_del(&vport->detach_list);
2288 ovs_dp_detach_port(vport);
2293 cancel_work_sync(&ovs_net->dp_notify_work);
2296 static struct pernet_operations ovs_net_ops = {
2297 .init = ovs_init_net,
2298 .exit = ovs_exit_net,
2300 .size = sizeof(struct ovs_net),
2303 static int __init dp_init(void)
2307 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2309 pr_info("Open vSwitch switching datapath\n");
2311 err = action_fifos_init();
2315 err = ovs_internal_dev_rtnl_link_register();
2317 goto error_action_fifos_exit;
2319 err = ovs_flow_init();
2321 goto error_unreg_rtnl_link;
2323 err = ovs_vport_init();
2325 goto error_flow_exit;
2327 err = register_pernet_device(&ovs_net_ops);
2329 goto error_vport_exit;
2331 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2333 goto error_netns_exit;
2335 err = ovs_netdev_init();
2337 goto error_unreg_notifier;
2339 err = dp_register_genl();
2341 goto error_unreg_netdev;
2347 error_unreg_notifier:
2348 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2350 unregister_pernet_device(&ovs_net_ops);
2355 error_unreg_rtnl_link:
2356 ovs_internal_dev_rtnl_link_unregister();
2357 error_action_fifos_exit:
2358 action_fifos_exit();
2363 static void dp_cleanup(void)
2365 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2367 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2368 unregister_pernet_device(&ovs_net_ops);
2372 ovs_internal_dev_rtnl_link_unregister();
2373 action_fifos_exit();
2376 module_init(dp_init);
2377 module_exit(dp_cleanup);
2379 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2380 MODULE_LICENSE("GPL");