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;
341 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
342 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
344 return PTR_ERR(segs);
348 if (gso_type & SKB_GSO_UDP) {
349 /* The initial flow key extracted by ovs_flow_key_extract()
350 * in this case is for a first fragment, so we need to
351 * properly mark later fragments.
354 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
357 /* Queue all of the segments. */
360 if (gso_type & SKB_GSO_UDP && skb != segs)
363 err = queue_userspace_packet(dp, skb, key, upcall_info);
367 } while ((skb = skb->next));
369 /* Free all of the segments. */
377 } while ((skb = nskb));
381 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
384 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
385 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
386 + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */
388 /* OVS_PACKET_ATTR_USERDATA */
389 if (upcall_info->userdata)
390 size += NLA_ALIGN(upcall_info->userdata->nla_len);
392 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
393 if (upcall_info->egress_tun_info)
394 size += nla_total_size(ovs_tun_key_attr_size());
396 /* OVS_PACKET_ATTR_ACTIONS */
397 if (upcall_info->actions_len)
398 size += nla_total_size(upcall_info->actions_len);
400 /* OVS_PACKET_ATTR_MRU */
401 if (upcall_info->mru)
402 size += nla_total_size(sizeof(upcall_info->mru));
407 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
409 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
410 size_t plen = NLA_ALIGN(skb->len) - skb->len;
413 memset(skb_put(skb, plen), 0, plen);
417 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
418 const struct sw_flow_key *key,
419 const struct dp_upcall_info *upcall_info)
421 struct ovs_header *upcall;
422 struct sk_buff *nskb = NULL;
423 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
425 struct genl_info info = {
426 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
427 .snd_portid = upcall_info->portid,
433 dp_ifindex = get_dpifindex(dp);
437 if (skb_vlan_tag_present(skb)) {
438 nskb = skb_clone(skb, GFP_ATOMIC);
442 nskb = __vlan_hwaccel_push_inside(nskb);
449 if (nla_attr_size(skb->len) > USHRT_MAX) {
454 /* Complete checksum if needed */
455 if (skb->ip_summed == CHECKSUM_PARTIAL &&
456 (err = skb_checksum_help(skb)))
459 /* Older versions of OVS user space enforce alignment of the last
460 * Netlink attribute to NLA_ALIGNTO which would require extensive
461 * padding logic. Only perform zerocopy if padding is not required.
463 if (dp->user_features & OVS_DP_F_UNALIGNED)
464 hlen = skb_zerocopy_headlen(skb);
468 len = upcall_msg_size(upcall_info, hlen);
469 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
475 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
476 0, upcall_info->cmd);
477 upcall->dp_ifindex = dp_ifindex;
479 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
482 if (upcall_info->userdata)
483 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
484 nla_len(upcall_info->userdata),
485 nla_data(upcall_info->userdata));
487 if (upcall_info->egress_tun_info) {
488 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
489 err = ovs_nla_put_tunnel_info(user_skb,
490 upcall_info->egress_tun_info);
492 nla_nest_end(user_skb, nla);
495 if (upcall_info->actions_len) {
496 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
497 err = ovs_nla_put_actions(upcall_info->actions,
498 upcall_info->actions_len,
501 nla_nest_end(user_skb, nla);
503 nla_nest_cancel(user_skb, nla);
506 /* Add OVS_PACKET_ATTR_MRU */
507 if (upcall_info->mru) {
508 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
513 pad_packet(dp, user_skb);
516 /* Only reserve room for attribute header, packet data is added
517 * in skb_zerocopy() */
518 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
522 nla->nla_len = nla_attr_size(skb->len);
524 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
528 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
529 pad_packet(dp, user_skb);
531 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
533 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
543 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
545 struct ovs_header *ovs_header = info->userhdr;
546 struct net *net = sock_net(skb->sk);
547 struct nlattr **a = info->attrs;
548 struct sw_flow_actions *acts;
549 struct sk_buff *packet;
550 struct sw_flow *flow;
551 struct sw_flow_actions *sf_acts;
554 struct vport *input_vport;
558 bool log = !a[OVS_PACKET_ATTR_PROBE];
561 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
562 !a[OVS_PACKET_ATTR_ACTIONS])
565 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
566 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
570 skb_reserve(packet, NET_IP_ALIGN);
572 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
574 skb_reset_mac_header(packet);
575 eth = eth_hdr(packet);
577 /* Normally, setting the skb 'protocol' field would be handled by a
578 * call to eth_type_trans(), but it assumes there's a sending
579 * device, which we may not have. */
580 if (eth_proto_is_802_3(eth->h_proto))
581 packet->protocol = eth->h_proto;
583 packet->protocol = htons(ETH_P_802_2);
585 /* Set packet's mru */
586 if (a[OVS_PACKET_ATTR_MRU]) {
587 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
588 packet->ignore_df = 1;
590 OVS_CB(packet)->mru = mru;
592 /* Build an sw_flow for sending this packet. */
593 flow = ovs_flow_alloc();
598 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
599 packet, &flow->key, log);
603 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
604 &flow->key, &acts, log);
608 rcu_assign_pointer(flow->sf_acts, acts);
609 packet->priority = flow->key.phy.priority;
610 packet->mark = flow->key.phy.skb_mark;
613 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
618 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
620 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
625 packet->dev = input_vport->dev;
626 OVS_CB(packet)->input_vport = input_vport;
627 sf_acts = rcu_dereference(flow->sf_acts);
630 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
634 ovs_flow_free(flow, false);
640 ovs_flow_free(flow, false);
647 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
648 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
649 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
650 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
651 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
652 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
655 static const struct genl_ops dp_packet_genl_ops[] = {
656 { .cmd = OVS_PACKET_CMD_EXECUTE,
657 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
658 .policy = packet_policy,
659 .doit = ovs_packet_cmd_execute
663 static struct genl_family dp_packet_genl_family = {
664 .id = GENL_ID_GENERATE,
665 .hdrsize = sizeof(struct ovs_header),
666 .name = OVS_PACKET_FAMILY,
667 .version = OVS_PACKET_VERSION,
668 .maxattr = OVS_PACKET_ATTR_MAX,
670 .parallel_ops = true,
671 .ops = dp_packet_genl_ops,
672 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
675 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
676 struct ovs_dp_megaflow_stats *mega_stats)
680 memset(mega_stats, 0, sizeof(*mega_stats));
682 stats->n_flows = ovs_flow_tbl_count(&dp->table);
683 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
685 stats->n_hit = stats->n_missed = stats->n_lost = 0;
687 for_each_possible_cpu(i) {
688 const struct dp_stats_percpu *percpu_stats;
689 struct dp_stats_percpu local_stats;
692 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
695 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
696 local_stats = *percpu_stats;
697 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
699 stats->n_hit += local_stats.n_hit;
700 stats->n_missed += local_stats.n_missed;
701 stats->n_lost += local_stats.n_lost;
702 mega_stats->n_mask_hit += local_stats.n_mask_hit;
706 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
708 return ovs_identifier_is_ufid(sfid) &&
709 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
712 static bool should_fill_mask(uint32_t ufid_flags)
714 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
717 static bool should_fill_actions(uint32_t ufid_flags)
719 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
722 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
723 const struct sw_flow_id *sfid,
726 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
728 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
729 * see ovs_nla_put_identifier()
731 if (sfid && ovs_identifier_is_ufid(sfid))
732 len += nla_total_size(sfid->ufid_len);
734 len += nla_total_size(ovs_key_attr_size());
736 /* OVS_FLOW_ATTR_KEY */
737 if (!sfid || should_fill_key(sfid, ufid_flags))
738 len += nla_total_size(ovs_key_attr_size());
740 /* OVS_FLOW_ATTR_MASK */
741 if (should_fill_mask(ufid_flags))
742 len += nla_total_size(ovs_key_attr_size());
744 /* OVS_FLOW_ATTR_ACTIONS */
745 if (should_fill_actions(ufid_flags))
746 len += nla_total_size(acts->orig_len);
749 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
750 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
751 + nla_total_size(8); /* OVS_FLOW_ATTR_USED */
754 /* Called with ovs_mutex or RCU read lock. */
755 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
758 struct ovs_flow_stats stats;
762 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
765 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
768 if (stats.n_packets &&
769 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
772 if ((u8)ntohs(tcp_flags) &&
773 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
779 /* Called with ovs_mutex or RCU read lock. */
780 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
781 struct sk_buff *skb, int skb_orig_len)
783 struct nlattr *start;
786 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
787 * this is the first flow to be dumped into 'skb'. This is unusual for
788 * Netlink but individual action lists can be longer than
789 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
790 * The userspace caller can always fetch the actions separately if it
791 * really wants them. (Most userspace callers in fact don't care.)
793 * This can only fail for dump operations because the skb is always
794 * properly sized for single flows.
796 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
798 const struct sw_flow_actions *sf_acts;
800 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
801 err = ovs_nla_put_actions(sf_acts->actions,
802 sf_acts->actions_len, skb);
805 nla_nest_end(skb, start);
810 nla_nest_cancel(skb, start);
812 } else if (skb_orig_len) {
819 /* Called with ovs_mutex or RCU read lock. */
820 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
821 struct sk_buff *skb, u32 portid,
822 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
824 const int skb_orig_len = skb->len;
825 struct ovs_header *ovs_header;
828 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
833 ovs_header->dp_ifindex = dp_ifindex;
835 err = ovs_nla_put_identifier(flow, skb);
839 if (should_fill_key(&flow->id, ufid_flags)) {
840 err = ovs_nla_put_masked_key(flow, skb);
845 if (should_fill_mask(ufid_flags)) {
846 err = ovs_nla_put_mask(flow, skb);
851 err = ovs_flow_cmd_fill_stats(flow, skb);
855 if (should_fill_actions(ufid_flags)) {
856 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
861 genlmsg_end(skb, ovs_header);
865 genlmsg_cancel(skb, ovs_header);
869 /* May not be called with RCU read lock. */
870 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
871 const struct sw_flow_id *sfid,
872 struct genl_info *info,
879 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
882 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
883 skb = genlmsg_new_unicast(len, info, GFP_KERNEL);
885 return ERR_PTR(-ENOMEM);
890 /* Called with ovs_mutex. */
891 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
893 struct genl_info *info, u8 cmd,
894 bool always, u32 ufid_flags)
899 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
900 &flow->id, info, always, ufid_flags);
901 if (IS_ERR_OR_NULL(skb))
904 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
905 info->snd_portid, info->snd_seq, 0,
907 if (WARN_ON_ONCE(retval < 0)) {
909 skb = ERR_PTR(retval);
914 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
916 struct net *net = sock_net(skb->sk);
917 struct nlattr **a = info->attrs;
918 struct ovs_header *ovs_header = info->userhdr;
919 struct sw_flow *flow = NULL, *new_flow;
920 struct sw_flow_mask mask;
921 struct sk_buff *reply;
923 struct sw_flow_key key;
924 struct sw_flow_actions *acts;
925 struct sw_flow_match match;
926 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
928 bool log = !a[OVS_FLOW_ATTR_PROBE];
930 /* Must have key and actions. */
932 if (!a[OVS_FLOW_ATTR_KEY]) {
933 OVS_NLERR(log, "Flow key attr not present in new flow.");
936 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
937 OVS_NLERR(log, "Flow actions attr not present in new flow.");
941 /* Most of the time we need to allocate a new flow, do it before
944 new_flow = ovs_flow_alloc();
945 if (IS_ERR(new_flow)) {
946 error = PTR_ERR(new_flow);
951 ovs_match_init(&match, &key, &mask);
952 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
953 a[OVS_FLOW_ATTR_MASK], log);
957 ovs_flow_mask_key(&new_flow->key, &key, true, &mask);
959 /* Extract flow identifier. */
960 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
965 /* Validate actions. */
966 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
967 &new_flow->key, &acts, log);
969 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
973 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
976 error = PTR_ERR(reply);
981 dp = get_dp(net, ovs_header->dp_ifindex);
987 /* Check if this is a duplicate flow */
988 if (ovs_identifier_is_ufid(&new_flow->id))
989 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
991 flow = ovs_flow_tbl_lookup(&dp->table, &key);
993 rcu_assign_pointer(new_flow->sf_acts, acts);
995 /* Put flow in bucket. */
996 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
997 if (unlikely(error)) {
1002 if (unlikely(reply)) {
1003 error = ovs_flow_cmd_fill_info(new_flow,
1004 ovs_header->dp_ifindex,
1005 reply, info->snd_portid,
1013 struct sw_flow_actions *old_acts;
1015 /* Bail out if we're not allowed to modify an existing flow.
1016 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1017 * because Generic Netlink treats the latter as a dump
1018 * request. We also accept NLM_F_EXCL in case that bug ever
1021 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1024 goto err_unlock_ovs;
1026 /* The flow identifier has to be the same for flow updates.
1027 * Look for any overlapping flow.
1029 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1030 if (ovs_identifier_is_key(&flow->id))
1031 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1033 else /* UFID matches but key is different */
1037 goto err_unlock_ovs;
1040 /* Update actions. */
1041 old_acts = ovsl_dereference(flow->sf_acts);
1042 rcu_assign_pointer(flow->sf_acts, acts);
1044 if (unlikely(reply)) {
1045 error = ovs_flow_cmd_fill_info(flow,
1046 ovs_header->dp_ifindex,
1047 reply, info->snd_portid,
1055 ovs_nla_free_flow_actions_rcu(old_acts);
1056 ovs_flow_free(new_flow, false);
1060 ovs_notify(&dp_flow_genl_family, reply, info);
1067 ovs_nla_free_flow_actions(acts);
1069 ovs_flow_free(new_flow, false);
1074 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1075 static struct sw_flow_actions *get_flow_actions(struct net *net,
1076 const struct nlattr *a,
1077 const struct sw_flow_key *key,
1078 const struct sw_flow_mask *mask,
1081 struct sw_flow_actions *acts;
1082 struct sw_flow_key masked_key;
1085 ovs_flow_mask_key(&masked_key, key, true, mask);
1086 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1089 "Actions may not be safe on all matching packets");
1090 return ERR_PTR(error);
1096 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1098 struct net *net = sock_net(skb->sk);
1099 struct nlattr **a = info->attrs;
1100 struct ovs_header *ovs_header = info->userhdr;
1101 struct sw_flow_key key;
1102 struct sw_flow *flow;
1103 struct sw_flow_mask mask;
1104 struct sk_buff *reply = NULL;
1105 struct datapath *dp;
1106 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1107 struct sw_flow_match match;
1108 struct sw_flow_id sfid;
1109 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1111 bool log = !a[OVS_FLOW_ATTR_PROBE];
1116 if (!a[OVS_FLOW_ATTR_KEY]) {
1117 OVS_NLERR(log, "Flow key attribute not present in set flow.");
1121 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1122 ovs_match_init(&match, &key, &mask);
1123 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1124 a[OVS_FLOW_ATTR_MASK], log);
1128 /* Validate actions. */
1129 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1130 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key,
1133 error = PTR_ERR(acts);
1137 /* Can allocate before locking if have acts. */
1138 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1140 if (IS_ERR(reply)) {
1141 error = PTR_ERR(reply);
1142 goto err_kfree_acts;
1147 dp = get_dp(net, ovs_header->dp_ifindex);
1148 if (unlikely(!dp)) {
1150 goto err_unlock_ovs;
1152 /* Check that the flow exists. */
1154 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1156 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1157 if (unlikely(!flow)) {
1159 goto err_unlock_ovs;
1162 /* Update actions, if present. */
1164 old_acts = ovsl_dereference(flow->sf_acts);
1165 rcu_assign_pointer(flow->sf_acts, acts);
1167 if (unlikely(reply)) {
1168 error = ovs_flow_cmd_fill_info(flow,
1169 ovs_header->dp_ifindex,
1170 reply, info->snd_portid,
1177 /* Could not alloc without acts before locking. */
1178 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1179 info, OVS_FLOW_CMD_NEW, false,
1182 if (IS_ERR(reply)) {
1183 error = PTR_ERR(reply);
1184 goto err_unlock_ovs;
1189 if (a[OVS_FLOW_ATTR_CLEAR])
1190 ovs_flow_stats_clear(flow);
1194 ovs_notify(&dp_flow_genl_family, reply, info);
1196 ovs_nla_free_flow_actions_rcu(old_acts);
1204 ovs_nla_free_flow_actions(acts);
1209 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1211 struct nlattr **a = info->attrs;
1212 struct ovs_header *ovs_header = info->userhdr;
1213 struct net *net = sock_net(skb->sk);
1214 struct sw_flow_key key;
1215 struct sk_buff *reply;
1216 struct sw_flow *flow;
1217 struct datapath *dp;
1218 struct sw_flow_match match;
1219 struct sw_flow_id ufid;
1220 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1222 bool log = !a[OVS_FLOW_ATTR_PROBE];
1225 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1226 if (a[OVS_FLOW_ATTR_KEY]) {
1227 ovs_match_init(&match, &key, NULL);
1228 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1230 } else if (!ufid_present) {
1232 "Flow get message rejected, Key attribute missing.");
1239 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1246 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1248 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1254 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1255 OVS_FLOW_CMD_NEW, true, ufid_flags);
1256 if (IS_ERR(reply)) {
1257 err = PTR_ERR(reply);
1262 return genlmsg_reply(reply, info);
1268 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1270 struct nlattr **a = info->attrs;
1271 struct ovs_header *ovs_header = info->userhdr;
1272 struct net *net = sock_net(skb->sk);
1273 struct sw_flow_key key;
1274 struct sk_buff *reply;
1275 struct sw_flow *flow = NULL;
1276 struct datapath *dp;
1277 struct sw_flow_match match;
1278 struct sw_flow_id ufid;
1279 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1281 bool log = !a[OVS_FLOW_ATTR_PROBE];
1284 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1285 if (a[OVS_FLOW_ATTR_KEY]) {
1286 ovs_match_init(&match, &key, NULL);
1287 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1294 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1295 if (unlikely(!dp)) {
1300 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1301 err = ovs_flow_tbl_flush(&dp->table);
1306 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1308 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1309 if (unlikely(!flow)) {
1314 ovs_flow_tbl_remove(&dp->table, flow);
1317 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1318 &flow->id, info, false, ufid_flags);
1319 if (likely(reply)) {
1320 if (likely(!IS_ERR(reply))) {
1321 rcu_read_lock(); /*To keep RCU checker happy. */
1322 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1323 reply, info->snd_portid,
1328 if (WARN_ON_ONCE(err < 0)) {
1333 ovs_notify(&dp_flow_genl_family, reply, info);
1335 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1340 ovs_flow_free(flow, true);
1347 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1349 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1350 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1351 struct table_instance *ti;
1352 struct datapath *dp;
1356 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1357 OVS_FLOW_ATTR_MAX, flow_policy);
1360 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1363 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1369 ti = rcu_dereference(dp->table.ti);
1371 struct sw_flow *flow;
1374 bucket = cb->args[0];
1376 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1380 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1381 NETLINK_CB(cb->skb).portid,
1382 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1383 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1386 cb->args[0] = bucket;
1393 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1394 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1395 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1396 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1397 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1398 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1399 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1400 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1403 static const struct genl_ops dp_flow_genl_ops[] = {
1404 { .cmd = OVS_FLOW_CMD_NEW,
1405 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1406 .policy = flow_policy,
1407 .doit = ovs_flow_cmd_new
1409 { .cmd = OVS_FLOW_CMD_DEL,
1410 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1411 .policy = flow_policy,
1412 .doit = ovs_flow_cmd_del
1414 { .cmd = OVS_FLOW_CMD_GET,
1415 .flags = 0, /* OK for unprivileged users. */
1416 .policy = flow_policy,
1417 .doit = ovs_flow_cmd_get,
1418 .dumpit = ovs_flow_cmd_dump
1420 { .cmd = OVS_FLOW_CMD_SET,
1421 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1422 .policy = flow_policy,
1423 .doit = ovs_flow_cmd_set,
1427 static struct genl_family dp_flow_genl_family = {
1428 .id = GENL_ID_GENERATE,
1429 .hdrsize = sizeof(struct ovs_header),
1430 .name = OVS_FLOW_FAMILY,
1431 .version = OVS_FLOW_VERSION,
1432 .maxattr = OVS_FLOW_ATTR_MAX,
1434 .parallel_ops = true,
1435 .ops = dp_flow_genl_ops,
1436 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1437 .mcgrps = &ovs_dp_flow_multicast_group,
1441 static size_t ovs_dp_cmd_msg_size(void)
1443 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1445 msgsize += nla_total_size(IFNAMSIZ);
1446 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1447 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1448 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1453 /* Called with ovs_mutex. */
1454 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1455 u32 portid, u32 seq, u32 flags, u8 cmd)
1457 struct ovs_header *ovs_header;
1458 struct ovs_dp_stats dp_stats;
1459 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1462 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1467 ovs_header->dp_ifindex = get_dpifindex(dp);
1469 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1471 goto nla_put_failure;
1473 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1474 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1476 goto nla_put_failure;
1478 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1479 sizeof(struct ovs_dp_megaflow_stats),
1480 &dp_megaflow_stats))
1481 goto nla_put_failure;
1483 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1484 goto nla_put_failure;
1486 genlmsg_end(skb, ovs_header);
1490 genlmsg_cancel(skb, ovs_header);
1495 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1497 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1500 /* Called with rcu_read_lock or ovs_mutex. */
1501 static struct datapath *lookup_datapath(struct net *net,
1502 const struct ovs_header *ovs_header,
1503 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1505 struct datapath *dp;
1507 if (!a[OVS_DP_ATTR_NAME])
1508 dp = get_dp(net, ovs_header->dp_ifindex);
1510 struct vport *vport;
1512 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1513 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1515 return dp ? dp : ERR_PTR(-ENODEV);
1518 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1520 struct datapath *dp;
1522 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1526 WARN(dp->user_features, "Dropping previously announced user features\n");
1527 dp->user_features = 0;
1530 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1532 if (a[OVS_DP_ATTR_USER_FEATURES])
1533 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1536 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1538 struct nlattr **a = info->attrs;
1539 struct vport_parms parms;
1540 struct sk_buff *reply;
1541 struct datapath *dp;
1542 struct vport *vport;
1543 struct ovs_net *ovs_net;
1547 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1550 reply = ovs_dp_cmd_alloc_info(info);
1555 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1557 goto err_free_reply;
1559 ovs_dp_set_net(dp, sock_net(skb->sk));
1561 /* Allocate table. */
1562 err = ovs_flow_tbl_init(&dp->table);
1566 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1567 if (!dp->stats_percpu) {
1569 goto err_destroy_table;
1572 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1576 goto err_destroy_percpu;
1579 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1580 INIT_HLIST_HEAD(&dp->ports[i]);
1582 /* Set up our datapath device. */
1583 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1584 parms.type = OVS_VPORT_TYPE_INTERNAL;
1585 parms.options = NULL;
1587 parms.port_no = OVSP_LOCAL;
1588 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1590 ovs_dp_change(dp, a);
1592 /* So far only local changes have been made, now need the lock. */
1595 vport = new_vport(&parms);
1596 if (IS_ERR(vport)) {
1597 err = PTR_ERR(vport);
1601 if (err == -EEXIST) {
1602 /* An outdated user space instance that does not understand
1603 * the concept of user_features has attempted to create a new
1604 * datapath and is likely to reuse it. Drop all user features.
1606 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1607 ovs_dp_reset_user_features(skb, info);
1610 goto err_destroy_ports_array;
1613 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1614 info->snd_seq, 0, OVS_DP_CMD_NEW);
1617 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1618 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1622 ovs_notify(&dp_datapath_genl_family, reply, info);
1625 err_destroy_ports_array:
1629 free_percpu(dp->stats_percpu);
1631 ovs_flow_tbl_destroy(&dp->table);
1640 /* Called with ovs_mutex. */
1641 static void __dp_destroy(struct datapath *dp)
1645 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1646 struct vport *vport;
1647 struct hlist_node *n;
1649 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1650 if (vport->port_no != OVSP_LOCAL)
1651 ovs_dp_detach_port(vport);
1654 list_del_rcu(&dp->list_node);
1656 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1657 * all ports in datapath are destroyed first before freeing datapath.
1659 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1661 /* RCU destroy the flow table */
1662 call_rcu(&dp->rcu, destroy_dp_rcu);
1665 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1667 struct sk_buff *reply;
1668 struct datapath *dp;
1671 reply = ovs_dp_cmd_alloc_info(info);
1676 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1679 goto err_unlock_free;
1681 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1682 info->snd_seq, 0, OVS_DP_CMD_DEL);
1688 ovs_notify(&dp_datapath_genl_family, reply, info);
1698 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1700 struct sk_buff *reply;
1701 struct datapath *dp;
1704 reply = ovs_dp_cmd_alloc_info(info);
1709 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1712 goto err_unlock_free;
1714 ovs_dp_change(dp, info->attrs);
1716 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1717 info->snd_seq, 0, OVS_DP_CMD_NEW);
1721 ovs_notify(&dp_datapath_genl_family, reply, info);
1731 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1733 struct sk_buff *reply;
1734 struct datapath *dp;
1737 reply = ovs_dp_cmd_alloc_info(info);
1742 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1745 goto err_unlock_free;
1747 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1748 info->snd_seq, 0, OVS_DP_CMD_NEW);
1752 return genlmsg_reply(reply, info);
1760 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1762 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1763 struct datapath *dp;
1764 int skip = cb->args[0];
1768 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1770 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1771 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1772 OVS_DP_CMD_NEW) < 0)
1783 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1784 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1785 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1786 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1789 static const struct genl_ops dp_datapath_genl_ops[] = {
1790 { .cmd = OVS_DP_CMD_NEW,
1791 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1792 .policy = datapath_policy,
1793 .doit = ovs_dp_cmd_new
1795 { .cmd = OVS_DP_CMD_DEL,
1796 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1797 .policy = datapath_policy,
1798 .doit = ovs_dp_cmd_del
1800 { .cmd = OVS_DP_CMD_GET,
1801 .flags = 0, /* OK for unprivileged users. */
1802 .policy = datapath_policy,
1803 .doit = ovs_dp_cmd_get,
1804 .dumpit = ovs_dp_cmd_dump
1806 { .cmd = OVS_DP_CMD_SET,
1807 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1808 .policy = datapath_policy,
1809 .doit = ovs_dp_cmd_set,
1813 static struct genl_family dp_datapath_genl_family = {
1814 .id = GENL_ID_GENERATE,
1815 .hdrsize = sizeof(struct ovs_header),
1816 .name = OVS_DATAPATH_FAMILY,
1817 .version = OVS_DATAPATH_VERSION,
1818 .maxattr = OVS_DP_ATTR_MAX,
1820 .parallel_ops = true,
1821 .ops = dp_datapath_genl_ops,
1822 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1823 .mcgrps = &ovs_dp_datapath_multicast_group,
1827 /* Called with ovs_mutex or RCU read lock. */
1828 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1829 u32 portid, u32 seq, u32 flags, u8 cmd)
1831 struct ovs_header *ovs_header;
1832 struct ovs_vport_stats vport_stats;
1835 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1840 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1842 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1843 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1844 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1845 ovs_vport_name(vport)))
1846 goto nla_put_failure;
1848 ovs_vport_get_stats(vport, &vport_stats);
1849 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1851 goto nla_put_failure;
1853 if (ovs_vport_get_upcall_portids(vport, skb))
1854 goto nla_put_failure;
1856 err = ovs_vport_get_options(vport, skb);
1857 if (err == -EMSGSIZE)
1860 genlmsg_end(skb, ovs_header);
1866 genlmsg_cancel(skb, ovs_header);
1870 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1872 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1875 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1876 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1879 struct sk_buff *skb;
1882 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1884 return ERR_PTR(-ENOMEM);
1886 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1892 /* Called with ovs_mutex or RCU read lock. */
1893 static struct vport *lookup_vport(struct net *net,
1894 const struct ovs_header *ovs_header,
1895 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1897 struct datapath *dp;
1898 struct vport *vport;
1900 if (a[OVS_VPORT_ATTR_NAME]) {
1901 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1903 return ERR_PTR(-ENODEV);
1904 if (ovs_header->dp_ifindex &&
1905 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1906 return ERR_PTR(-ENODEV);
1908 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1909 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1911 if (port_no >= DP_MAX_PORTS)
1912 return ERR_PTR(-EFBIG);
1914 dp = get_dp(net, ovs_header->dp_ifindex);
1916 return ERR_PTR(-ENODEV);
1918 vport = ovs_vport_ovsl_rcu(dp, port_no);
1920 return ERR_PTR(-ENODEV);
1923 return ERR_PTR(-EINVAL);
1926 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1928 struct nlattr **a = info->attrs;
1929 struct ovs_header *ovs_header = info->userhdr;
1930 struct vport_parms parms;
1931 struct sk_buff *reply;
1932 struct vport *vport;
1933 struct datapath *dp;
1937 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1938 !a[OVS_VPORT_ATTR_UPCALL_PID])
1941 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1942 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1943 if (port_no >= DP_MAX_PORTS)
1946 reply = ovs_vport_cmd_alloc_info();
1952 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1955 goto exit_unlock_free;
1958 vport = ovs_vport_ovsl(dp, port_no);
1961 goto exit_unlock_free;
1963 for (port_no = 1; ; port_no++) {
1964 if (port_no >= DP_MAX_PORTS) {
1966 goto exit_unlock_free;
1968 vport = ovs_vport_ovsl(dp, port_no);
1974 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1975 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1976 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1978 parms.port_no = port_no;
1979 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1981 vport = new_vport(&parms);
1982 err = PTR_ERR(vport);
1983 if (IS_ERR(vport)) {
1986 goto exit_unlock_free;
1989 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1990 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1994 ovs_notify(&dp_vport_genl_family, reply, info);
2003 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2005 struct nlattr **a = info->attrs;
2006 struct sk_buff *reply;
2007 struct vport *vport;
2010 reply = ovs_vport_cmd_alloc_info();
2015 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2016 err = PTR_ERR(vport);
2018 goto exit_unlock_free;
2020 if (a[OVS_VPORT_ATTR_TYPE] &&
2021 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2023 goto exit_unlock_free;
2026 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2027 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2029 goto exit_unlock_free;
2033 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2034 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2036 err = ovs_vport_set_upcall_portids(vport, ids);
2038 goto exit_unlock_free;
2041 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2042 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2046 ovs_notify(&dp_vport_genl_family, reply, info);
2055 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2057 struct nlattr **a = info->attrs;
2058 struct sk_buff *reply;
2059 struct vport *vport;
2062 reply = ovs_vport_cmd_alloc_info();
2067 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2068 err = PTR_ERR(vport);
2070 goto exit_unlock_free;
2072 if (vport->port_no == OVSP_LOCAL) {
2074 goto exit_unlock_free;
2077 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2078 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2080 ovs_dp_detach_port(vport);
2083 ovs_notify(&dp_vport_genl_family, reply, info);
2092 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2094 struct nlattr **a = info->attrs;
2095 struct ovs_header *ovs_header = info->userhdr;
2096 struct sk_buff *reply;
2097 struct vport *vport;
2100 reply = ovs_vport_cmd_alloc_info();
2105 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2106 err = PTR_ERR(vport);
2108 goto exit_unlock_free;
2109 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2110 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2114 return genlmsg_reply(reply, info);
2122 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2124 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2125 struct datapath *dp;
2126 int bucket = cb->args[0], skip = cb->args[1];
2130 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2135 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2136 struct vport *vport;
2139 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2141 ovs_vport_cmd_fill_info(vport, skb,
2142 NETLINK_CB(cb->skb).portid,
2145 OVS_VPORT_CMD_NEW) < 0)
2161 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2162 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2163 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2164 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2165 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2166 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2167 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2170 static const struct genl_ops dp_vport_genl_ops[] = {
2171 { .cmd = OVS_VPORT_CMD_NEW,
2172 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2173 .policy = vport_policy,
2174 .doit = ovs_vport_cmd_new
2176 { .cmd = OVS_VPORT_CMD_DEL,
2177 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2178 .policy = vport_policy,
2179 .doit = ovs_vport_cmd_del
2181 { .cmd = OVS_VPORT_CMD_GET,
2182 .flags = 0, /* OK for unprivileged users. */
2183 .policy = vport_policy,
2184 .doit = ovs_vport_cmd_get,
2185 .dumpit = ovs_vport_cmd_dump
2187 { .cmd = OVS_VPORT_CMD_SET,
2188 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2189 .policy = vport_policy,
2190 .doit = ovs_vport_cmd_set,
2194 struct genl_family dp_vport_genl_family = {
2195 .id = GENL_ID_GENERATE,
2196 .hdrsize = sizeof(struct ovs_header),
2197 .name = OVS_VPORT_FAMILY,
2198 .version = OVS_VPORT_VERSION,
2199 .maxattr = OVS_VPORT_ATTR_MAX,
2201 .parallel_ops = true,
2202 .ops = dp_vport_genl_ops,
2203 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2204 .mcgrps = &ovs_dp_vport_multicast_group,
2208 static struct genl_family * const dp_genl_families[] = {
2209 &dp_datapath_genl_family,
2210 &dp_vport_genl_family,
2211 &dp_flow_genl_family,
2212 &dp_packet_genl_family,
2215 static void dp_unregister_genl(int n_families)
2219 for (i = 0; i < n_families; i++)
2220 genl_unregister_family(dp_genl_families[i]);
2223 static int dp_register_genl(void)
2228 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2230 err = genl_register_family(dp_genl_families[i]);
2238 dp_unregister_genl(i);
2242 static int __net_init ovs_init_net(struct net *net)
2244 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2246 INIT_LIST_HEAD(&ovs_net->dps);
2247 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2252 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2253 struct list_head *head)
2255 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2256 struct datapath *dp;
2258 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2261 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2262 struct vport *vport;
2264 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2265 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2268 if (dev_net(vport->dev) == dnet)
2269 list_add(&vport->detach_list, head);
2275 static void __net_exit ovs_exit_net(struct net *dnet)
2277 struct datapath *dp, *dp_next;
2278 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2279 struct vport *vport, *vport_next;
2285 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2290 list_vports_from_net(net, dnet, &head);
2293 /* Detach all vports from given namespace. */
2294 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2295 list_del(&vport->detach_list);
2296 ovs_dp_detach_port(vport);
2301 cancel_work_sync(&ovs_net->dp_notify_work);
2304 static struct pernet_operations ovs_net_ops = {
2305 .init = ovs_init_net,
2306 .exit = ovs_exit_net,
2308 .size = sizeof(struct ovs_net),
2311 static int __init dp_init(void)
2315 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2317 pr_info("Open vSwitch switching datapath\n");
2319 err = action_fifos_init();
2323 err = ovs_internal_dev_rtnl_link_register();
2325 goto error_action_fifos_exit;
2327 err = ovs_flow_init();
2329 goto error_unreg_rtnl_link;
2331 err = ovs_vport_init();
2333 goto error_flow_exit;
2335 err = register_pernet_device(&ovs_net_ops);
2337 goto error_vport_exit;
2339 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2341 goto error_netns_exit;
2343 err = ovs_netdev_init();
2345 goto error_unreg_notifier;
2347 err = dp_register_genl();
2349 goto error_unreg_netdev;
2355 error_unreg_notifier:
2356 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2358 unregister_pernet_device(&ovs_net_ops);
2363 error_unreg_rtnl_link:
2364 ovs_internal_dev_rtnl_link_unregister();
2365 error_action_fifos_exit:
2366 action_fifos_exit();
2371 static void dp_cleanup(void)
2373 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2375 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2376 unregister_pernet_device(&ovs_net_ops);
2380 ovs_internal_dev_rtnl_link_unregister();
2381 action_fifos_exit();
2384 module_init(dp_init);
2385 module_exit(dp_cleanup);
2387 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2388 MODULE_LICENSE("GPL");