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/version.h>
40 #include <linux/ethtool.h>
41 #include <linux/wait.h>
42 #include <asm/div64.h>
43 #include <linux/highmem.h>
44 #include <linux/netfilter_bridge.h>
45 #include <linux/netfilter_ipv4.h>
46 #include <linux/inetdevice.h>
47 #include <linux/list.h>
48 #include <linux/openvswitch.h>
49 #include <linux/rculist.h>
50 #include <linux/dmi.h>
51 #include <linux/genetlink.h>
52 #include <net/genetlink.h>
53 #include <net/genetlink.h>
54 #include <net/net_namespace.h>
55 #include <net/netns/generic.h>
59 #include "flow_table.h"
60 #include "flow_netlink.h"
62 #include "vport-internal_dev.h"
63 #include "vport-netdev.h"
65 int ovs_net_id __read_mostly;
67 static struct genl_family dp_packet_genl_family;
68 static struct genl_family dp_flow_genl_family;
69 static struct genl_family dp_datapath_genl_family;
71 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
72 .name = OVS_FLOW_MCGROUP
75 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
76 .name = OVS_DATAPATH_MCGROUP
79 struct genl_multicast_group ovs_dp_vport_multicast_group = {
80 .name = OVS_VPORT_MCGROUP
83 /* Check if need to build a reply message.
84 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
85 static bool ovs_must_notify(struct genl_info *info,
86 const struct genl_multicast_group *grp)
88 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
89 netlink_has_listeners(genl_info_net(info)->genl_sock, GROUP_ID(grp));
92 static void ovs_notify(struct genl_family *family, struct genl_multicast_group *grp,
93 struct sk_buff *skb, struct genl_info *info)
95 genl_notify(family, skb, genl_info_net(info),
96 info->snd_portid, GROUP_ID(grp), info->nlhdr, GFP_KERNEL);
102 * All writes e.g. Writes to device state (add/remove datapath, port, set
103 * operations on vports, etc.), Writes to other state (flow table
104 * modifications, set miscellaneous datapath parameters, etc.) are protected
107 * Reads are protected by RCU.
109 * There are a few special cases (mostly stats) that have their own
110 * synchronization but they nest under all of above and don't interact with
113 * The RTNL lock nests inside ovs_mutex.
116 static DEFINE_MUTEX(ovs_mutex);
120 mutex_lock(&ovs_mutex);
123 void ovs_unlock(void)
125 mutex_unlock(&ovs_mutex);
128 #ifdef CONFIG_LOCKDEP
129 int lockdep_ovsl_is_held(void)
132 return lockdep_is_held(&ovs_mutex);
138 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
139 const struct dp_upcall_info *);
140 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
141 const struct dp_upcall_info *);
143 /* Must be called with rcu_read_lock or ovs_mutex. */
144 static struct datapath *get_dp(struct net *net, int dp_ifindex)
146 struct datapath *dp = NULL;
147 struct net_device *dev;
150 dev = dev_get_by_index_rcu(net, dp_ifindex);
152 struct vport *vport = ovs_internal_dev_get_vport(dev);
161 /* Must be called with rcu_read_lock or ovs_mutex. */
162 const char *ovs_dp_name(const struct datapath *dp)
164 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
165 return vport->ops->get_name(vport);
168 static int get_dpifindex(struct datapath *dp)
175 local = ovs_vport_rcu(dp, OVSP_LOCAL);
177 ifindex = netdev_vport_priv(local)->dev->ifindex;
186 static void destroy_dp_rcu(struct rcu_head *rcu)
188 struct datapath *dp = container_of(rcu, struct datapath, rcu);
190 ovs_flow_tbl_destroy(&dp->table);
191 free_percpu(dp->stats_percpu);
192 release_net(ovs_dp_get_net(dp));
197 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
200 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
203 /* Called with ovs_mutex or RCU read lock. */
204 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
207 struct hlist_head *head;
209 head = vport_hash_bucket(dp, port_no);
210 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
211 if (vport->port_no == port_no)
217 /* Called with ovs_mutex. */
218 static struct vport *new_vport(const struct vport_parms *parms)
222 vport = ovs_vport_add(parms);
223 if (!IS_ERR(vport)) {
224 struct datapath *dp = parms->dp;
225 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
227 hlist_add_head_rcu(&vport->dp_hash_node, head);
232 void ovs_dp_detach_port(struct vport *p)
236 /* First drop references to device. */
237 hlist_del_rcu(&p->dp_hash_node);
239 /* Then destroy it. */
243 void ovs_dp_process_packet_with_key(struct sk_buff *skb,
244 struct sw_flow_key *pkt_key,
247 const struct vport *p = OVS_CB(skb)->input_vport;
248 struct datapath *dp = p->dp;
249 struct sw_flow *flow;
250 struct dp_stats_percpu *stats;
254 stats = this_cpu_ptr(dp->stats_percpu);
257 flow = ovs_flow_tbl_lookup_stats(&dp->table, pkt_key, skb_get_hash(skb),
259 if (unlikely(!flow)) {
260 struct dp_upcall_info upcall;
262 upcall.cmd = OVS_PACKET_CMD_MISS;
263 upcall.key = pkt_key;
264 upcall.userdata = NULL;
265 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
266 ovs_dp_upcall(dp, skb, &upcall);
268 stats_counter = &stats->n_missed;
272 OVS_CB(skb)->pkt_key = pkt_key;
273 OVS_CB(skb)->flow = flow;
275 ovs_flow_stats_update(OVS_CB(skb)->flow, pkt_key->tp.flags, skb);
276 ovs_execute_actions(dp, skb, recirc);
277 stats_counter = &stats->n_hit;
280 /* Update datapath statistics. */
281 u64_stats_update_begin(&stats->sync);
283 stats->n_mask_hit += n_mask_hit;
284 u64_stats_update_end(&stats->sync);
287 /* Must be called with rcu_read_lock. */
288 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
291 struct sw_flow_key key;
293 OVS_CB(skb)->input_vport = p;
295 /* Extract flow from 'skb' into 'key'. */
296 error = ovs_flow_key_extract(skb, &key);
297 if (unlikely(error)) {
302 ovs_dp_process_packet_with_key(skb, &key, false);
305 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
306 const struct dp_upcall_info *upcall_info)
308 struct dp_stats_percpu *stats;
311 if (upcall_info->portid == 0) {
316 if (!skb_is_gso(skb))
317 err = queue_userspace_packet(dp, skb, upcall_info);
319 err = queue_gso_packets(dp, skb, upcall_info);
326 stats = this_cpu_ptr(dp->stats_percpu);
328 u64_stats_update_begin(&stats->sync);
330 u64_stats_update_end(&stats->sync);
335 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
336 const struct dp_upcall_info *upcall_info)
338 unsigned short gso_type = skb_shinfo(skb)->gso_type;
339 struct dp_upcall_info later_info;
340 struct sw_flow_key later_key;
341 struct sk_buff *segs, *nskb;
342 struct ovs_skb_cb ovs_cb;
345 ovs_cb = *OVS_CB(skb);
346 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
347 *OVS_CB(skb) = ovs_cb;
349 return PTR_ERR(segs);
351 /* Queue all of the segments. */
354 *OVS_CB(skb) = ovs_cb;
355 err = queue_userspace_packet(dp, skb, upcall_info);
359 if (skb == segs && gso_type & SKB_GSO_UDP) {
360 /* The initial flow key extracted by ovs_flow_extract()
361 * in this case is for a first fragment, so we need to
362 * properly mark later fragments.
364 later_key = *upcall_info->key;
365 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
367 later_info = *upcall_info;
368 later_info.key = &later_key;
369 upcall_info = &later_info;
371 } while ((skb = skb->next));
373 /* Free all of the segments. */
381 } while ((skb = nskb));
385 static size_t key_attr_size(void)
387 /* Whenever adding new OVS_KEY_ FIELDS, we should consider
388 * updating this function. */
389 BUILD_BUG_ON(OVS_KEY_ATTR_IPV4_TUNNEL != 21);
391 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
392 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */
393 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */
394 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
395 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
396 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */
397 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */
398 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
399 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */
400 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */
401 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */
402 + nla_total_size(4) /* OVS_KEY_ATTR_DP_HASH */
403 + nla_total_size(4) /* OVS_KEY_ATTR_RECIRC_ID */
404 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
405 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
406 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */
407 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */
408 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
409 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
410 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
411 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
414 static size_t upcall_msg_size(const struct nlattr *userdata,
417 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
418 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
419 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
421 /* OVS_PACKET_ATTR_USERDATA */
423 size += NLA_ALIGN(userdata->nla_len);
428 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
429 const struct dp_upcall_info *upcall_info)
431 struct ovs_header *upcall;
432 struct sk_buff *nskb = NULL;
433 struct sk_buff *user_skb; /* to be queued to userspace */
435 struct genl_info info = {
436 #ifdef HAVE_GENLMSG_NEW_UNICAST
437 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
439 .snd_portid = upcall_info->portid,
445 dp_ifindex = get_dpifindex(dp);
449 if (vlan_tx_tag_present(skb)) {
450 nskb = skb_clone(skb, GFP_ATOMIC);
454 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
458 vlan_set_tci(nskb, 0);
463 if (nla_attr_size(skb->len) > USHRT_MAX) {
468 /* Complete checksum if needed */
469 if (skb->ip_summed == CHECKSUM_PARTIAL &&
470 (err = skb_checksum_help(skb)))
473 /* Older versions of OVS user space enforce alignment of the last
474 * Netlink attribute to NLA_ALIGNTO which would require extensive
475 * padding logic. Only perform zerocopy if padding is not required.
477 if (dp->user_features & OVS_DP_F_UNALIGNED)
478 hlen = skb_zerocopy_headlen(skb);
482 len = upcall_msg_size(upcall_info->userdata, hlen);
483 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
489 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
490 0, upcall_info->cmd);
491 upcall->dp_ifindex = dp_ifindex;
493 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
494 err = ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
496 nla_nest_end(user_skb, nla);
498 if (upcall_info->userdata)
499 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
500 nla_len(upcall_info->userdata),
501 nla_data(upcall_info->userdata));
503 /* Only reserve room for attribute header, packet data is added
504 * in skb_zerocopy() */
505 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
509 nla->nla_len = nla_attr_size(skb->len);
511 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
515 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
516 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
517 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
520 memset(skb_put(user_skb, plen), 0, plen);
523 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
525 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
533 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
535 struct ovs_header *ovs_header = info->userhdr;
536 struct nlattr **a = info->attrs;
537 struct sw_flow_actions *acts;
538 struct sk_buff *packet;
539 struct sw_flow *flow;
542 struct vport *input_vport;
547 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
548 !a[OVS_PACKET_ATTR_ACTIONS])
551 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
552 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
556 skb_reserve(packet, NET_IP_ALIGN);
558 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
560 skb_reset_mac_header(packet);
561 eth = eth_hdr(packet);
563 /* Normally, setting the skb 'protocol' field would be handled by a
564 * call to eth_type_trans(), but it assumes there's a sending
565 * device, which we may not have. */
566 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
567 packet->protocol = eth->h_proto;
569 packet->protocol = htons(ETH_P_802_2);
571 /* Build an sw_flow for sending this packet. */
572 flow = ovs_flow_alloc();
577 err = ovs_flow_key_extract_userspace(a[OVS_PACKET_ATTR_KEY], packet,
582 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
587 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
588 &flow->key, 0, &acts);
589 rcu_assign_pointer(flow->sf_acts, acts);
593 OVS_CB(packet)->flow = flow;
594 OVS_CB(packet)->pkt_key = &flow->key;
595 packet->priority = flow->key.phy.priority;
596 packet->mark = flow->key.phy.skb_mark;
599 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
604 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
606 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
611 OVS_CB(packet)->input_vport = input_vport;
614 err = ovs_execute_actions(dp, packet, false);
618 ovs_flow_free(flow, false);
624 ovs_flow_free(flow, false);
631 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
632 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
633 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
634 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
637 static struct genl_ops dp_packet_genl_ops[] = {
638 { .cmd = OVS_PACKET_CMD_EXECUTE,
639 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
640 .policy = packet_policy,
641 .doit = ovs_packet_cmd_execute
645 static struct genl_family dp_packet_genl_family = {
646 .id = GENL_ID_GENERATE,
647 .hdrsize = sizeof(struct ovs_header),
648 .name = OVS_PACKET_FAMILY,
649 .version = OVS_PACKET_VERSION,
650 .maxattr = OVS_PACKET_ATTR_MAX,
652 .parallel_ops = true,
653 .ops = dp_packet_genl_ops,
654 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
657 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
658 struct ovs_dp_megaflow_stats *mega_stats)
662 memset(mega_stats, 0, sizeof(*mega_stats));
664 stats->n_flows = ovs_flow_tbl_count(&dp->table);
665 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
667 stats->n_hit = stats->n_missed = stats->n_lost = 0;
669 for_each_possible_cpu(i) {
670 const struct dp_stats_percpu *percpu_stats;
671 struct dp_stats_percpu local_stats;
674 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
677 start = u64_stats_fetch_begin_irq(&percpu_stats->sync);
678 local_stats = *percpu_stats;
679 } while (u64_stats_fetch_retry_irq(&percpu_stats->sync, start));
681 stats->n_hit += local_stats.n_hit;
682 stats->n_missed += local_stats.n_missed;
683 stats->n_lost += local_stats.n_lost;
684 mega_stats->n_mask_hit += local_stats.n_mask_hit;
688 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
690 return NLMSG_ALIGN(sizeof(struct ovs_header))
691 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
692 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
693 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
694 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
695 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
696 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
699 /* Called with ovs_mutex or RCU read lock. */
700 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
701 struct sk_buff *skb, u32 portid,
702 u32 seq, u32 flags, u8 cmd)
704 const int skb_orig_len = skb->len;
705 struct nlattr *start;
706 struct ovs_flow_stats stats;
709 struct ovs_header *ovs_header;
713 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
717 ovs_header->dp_ifindex = dp_ifindex;
720 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
722 goto nla_put_failure;
724 err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
727 nla_nest_end(skb, nla);
729 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
731 goto nla_put_failure;
733 err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
737 nla_nest_end(skb, nla);
739 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
742 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
743 goto nla_put_failure;
745 if (stats.n_packets &&
746 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
747 goto nla_put_failure;
749 if ((u8)ntohs(tcp_flags) &&
750 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
751 goto nla_put_failure;
753 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
754 * this is the first flow to be dumped into 'skb'. This is unusual for
755 * Netlink but individual action lists can be longer than
756 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
757 * The userspace caller can always fetch the actions separately if it
758 * really wants them. (Most userspace callers in fact don't care.)
760 * This can only fail for dump operations because the skb is always
761 * properly sized for single flows.
763 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
765 const struct sw_flow_actions *sf_acts;
767 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
768 err = ovs_nla_put_actions(sf_acts->actions,
769 sf_acts->actions_len, skb);
772 nla_nest_end(skb, start);
777 nla_nest_cancel(skb, start);
779 } else if (skb_orig_len)
780 goto nla_put_failure;
782 return genlmsg_end(skb, ovs_header);
787 genlmsg_cancel(skb, ovs_header);
791 /* May not be called with RCU read lock. */
792 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
793 struct genl_info *info,
798 if (!always && !ovs_must_notify(info, &ovs_dp_flow_multicast_group))
801 skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts), info, GFP_KERNEL);
804 return ERR_PTR(-ENOMEM);
809 /* Called with ovs_mutex. */
810 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
812 struct genl_info *info, u8 cmd,
818 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), info,
820 if (!skb || IS_ERR(skb))
823 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
824 info->snd_portid, info->snd_seq, 0,
830 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
832 struct nlattr **a = info->attrs;
833 struct ovs_header *ovs_header = info->userhdr;
834 struct sw_flow *flow, *new_flow;
835 struct sw_flow_mask mask;
836 struct sk_buff *reply;
838 struct sw_flow_actions *acts;
839 struct sw_flow_match match;
842 /* Must have key and actions. */
844 if (!a[OVS_FLOW_ATTR_KEY])
846 if (!a[OVS_FLOW_ATTR_ACTIONS])
849 /* Most of the time we need to allocate a new flow, do it before
851 new_flow = ovs_flow_alloc();
852 if (IS_ERR(new_flow)) {
853 error = PTR_ERR(new_flow);
858 ovs_match_init(&match, &new_flow->unmasked_key, &mask);
859 error = ovs_nla_get_match(&match,
860 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
864 ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask);
866 /* Validate actions. */
867 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
868 error = PTR_ERR(acts);
872 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
875 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
879 reply = ovs_flow_cmd_alloc_info(acts, info, false);
881 error = PTR_ERR(reply);
886 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
891 /* Check if this is a duplicate flow */
892 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->unmasked_key);
894 rcu_assign_pointer(new_flow->sf_acts, acts);
896 /* Put flow in bucket. */
897 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
898 if (unlikely(error)) {
903 if (unlikely(reply)) {
904 error = ovs_flow_cmd_fill_info(new_flow,
905 ovs_header->dp_ifindex,
906 reply, info->snd_portid,
913 struct sw_flow_actions *old_acts;
915 /* Bail out if we're not allowed to modify an existing flow.
916 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
917 * because Generic Netlink treats the latter as a dump
918 * request. We also accept NLM_F_EXCL in case that bug ever
921 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
926 /* The unmasked key has to be the same for flow updates. */
927 if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) {
928 /* Look for any overlapping flow. */
929 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
935 /* Update actions. */
936 old_acts = ovsl_dereference(flow->sf_acts);
937 rcu_assign_pointer(flow->sf_acts, acts);
939 if (unlikely(reply)) {
940 error = ovs_flow_cmd_fill_info(flow,
941 ovs_header->dp_ifindex,
942 reply, info->snd_portid,
949 ovs_nla_free_flow_actions(old_acts);
950 ovs_flow_free(new_flow, false);
954 ovs_notify(&dp_flow_genl_family, &ovs_dp_flow_multicast_group, reply, info);
963 ovs_flow_free(new_flow, false);
968 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
970 struct nlattr **a = info->attrs;
971 struct ovs_header *ovs_header = info->userhdr;
972 struct sw_flow_key key, masked_key;
973 struct sw_flow *flow;
974 struct sw_flow_mask mask;
975 struct sk_buff *reply = NULL;
977 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
978 struct sw_flow_match match;
983 if (!a[OVS_FLOW_ATTR_KEY])
986 ovs_match_init(&match, &key, &mask);
987 error = ovs_nla_get_match(&match,
988 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
992 /* Validate actions. */
993 if (a[OVS_FLOW_ATTR_ACTIONS]) {
994 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
995 error = PTR_ERR(acts);
999 ovs_flow_mask_key(&masked_key, &key, &mask);
1000 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
1001 &masked_key, 0, &acts);
1003 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
1004 goto err_kfree_acts;
1008 /* Can allocate before locking if have acts. */
1010 reply = ovs_flow_cmd_alloc_info(acts, info, false);
1011 if (IS_ERR(reply)) {
1012 error = PTR_ERR(reply);
1013 goto err_kfree_acts;
1018 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1019 if (unlikely(!dp)) {
1021 goto err_unlock_ovs;
1023 /* Check that the flow exists. */
1024 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1025 if (unlikely(!flow)) {
1027 goto err_unlock_ovs;
1030 /* Update actions, if present. */
1032 old_acts = ovsl_dereference(flow->sf_acts);
1033 rcu_assign_pointer(flow->sf_acts, acts);
1035 if (unlikely(reply)) {
1036 error = ovs_flow_cmd_fill_info(flow,
1037 ovs_header->dp_ifindex,
1038 reply, info->snd_portid,
1044 /* Could not alloc without acts before locking. */
1045 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1046 info, OVS_FLOW_CMD_NEW, false);
1047 if (unlikely(IS_ERR(reply))) {
1048 error = PTR_ERR(reply);
1049 goto err_unlock_ovs;
1054 if (a[OVS_FLOW_ATTR_CLEAR])
1055 ovs_flow_stats_clear(flow);
1059 ovs_notify(&dp_flow_genl_family, &ovs_dp_flow_multicast_group, reply, info);
1061 ovs_nla_free_flow_actions(old_acts);
1073 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1075 struct nlattr **a = info->attrs;
1076 struct ovs_header *ovs_header = info->userhdr;
1077 struct sw_flow_key key;
1078 struct sk_buff *reply;
1079 struct sw_flow *flow;
1080 struct datapath *dp;
1081 struct sw_flow_match match;
1084 if (!a[OVS_FLOW_ATTR_KEY]) {
1085 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
1089 ovs_match_init(&match, &key, NULL);
1090 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1095 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1101 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1107 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1108 OVS_FLOW_CMD_NEW, true);
1109 if (IS_ERR(reply)) {
1110 err = PTR_ERR(reply);
1115 return genlmsg_reply(reply, info);
1121 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1123 struct nlattr **a = info->attrs;
1124 struct ovs_header *ovs_header = info->userhdr;
1125 struct sw_flow_key key;
1126 struct sk_buff *reply;
1127 struct sw_flow *flow;
1128 struct datapath *dp;
1129 struct sw_flow_match match;
1132 if (likely(a[OVS_FLOW_ATTR_KEY])) {
1133 ovs_match_init(&match, &key, NULL);
1134 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1140 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1141 if (unlikely(!dp)) {
1145 if (unlikely(!a[OVS_FLOW_ATTR_KEY])) {
1146 err = ovs_flow_tbl_flush(&dp->table);
1149 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1150 if (unlikely(!flow)) {
1155 ovs_flow_tbl_remove(&dp->table, flow);
1158 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *)flow->sf_acts,
1161 if (likely(reply)) {
1162 if (likely(!IS_ERR(reply))) {
1163 rcu_read_lock(); /* Keep RCU checker happy. */
1164 err = ovs_flow_cmd_fill_info(flow,
1165 ovs_header->dp_ifindex,
1166 reply, info->snd_portid,
1171 ovs_notify(&dp_flow_genl_family, &ovs_dp_flow_multicast_group, reply, info);
1173 genl_set_err(&dp_flow_genl_family, sock_net(skb->sk), 0,
1174 GROUP_ID(&ovs_dp_flow_multicast_group), PTR_ERR(reply));
1179 ovs_flow_free(flow, true);
1186 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1188 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1189 struct table_instance *ti;
1190 struct datapath *dp;
1193 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1199 ti = rcu_dereference(dp->table.ti);
1201 struct sw_flow *flow;
1204 bucket = cb->args[0];
1206 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1210 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1211 NETLINK_CB(cb->skb).portid,
1212 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1213 OVS_FLOW_CMD_NEW) < 0)
1216 cb->args[0] = bucket;
1223 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1224 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1225 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1226 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1229 static struct genl_ops dp_flow_genl_ops[] = {
1230 { .cmd = OVS_FLOW_CMD_NEW,
1231 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1232 .policy = flow_policy,
1233 .doit = ovs_flow_cmd_new
1235 { .cmd = OVS_FLOW_CMD_DEL,
1236 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1237 .policy = flow_policy,
1238 .doit = ovs_flow_cmd_del
1240 { .cmd = OVS_FLOW_CMD_GET,
1241 .flags = 0, /* OK for unprivileged users. */
1242 .policy = flow_policy,
1243 .doit = ovs_flow_cmd_get,
1244 .dumpit = ovs_flow_cmd_dump
1246 { .cmd = OVS_FLOW_CMD_SET,
1247 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1248 .policy = flow_policy,
1249 .doit = ovs_flow_cmd_set,
1253 static struct genl_family dp_flow_genl_family = {
1254 .id = GENL_ID_GENERATE,
1255 .hdrsize = sizeof(struct ovs_header),
1256 .name = OVS_FLOW_FAMILY,
1257 .version = OVS_FLOW_VERSION,
1258 .maxattr = OVS_FLOW_ATTR_MAX,
1260 .parallel_ops = true,
1261 .ops = dp_flow_genl_ops,
1262 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1263 .mcgrps = &ovs_dp_flow_multicast_group,
1267 static size_t ovs_dp_cmd_msg_size(void)
1269 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1271 msgsize += nla_total_size(IFNAMSIZ);
1272 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1273 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1274 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1279 /* Called with ovs_mutex or RCU read lock. */
1280 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1281 u32 portid, u32 seq, u32 flags, u8 cmd)
1283 struct ovs_header *ovs_header;
1284 struct ovs_dp_stats dp_stats;
1285 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1288 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1293 ovs_header->dp_ifindex = get_dpifindex(dp);
1295 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1297 goto nla_put_failure;
1299 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1300 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1302 goto nla_put_failure;
1304 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1305 sizeof(struct ovs_dp_megaflow_stats),
1306 &dp_megaflow_stats))
1307 goto nla_put_failure;
1309 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1310 goto nla_put_failure;
1312 return genlmsg_end(skb, ovs_header);
1315 genlmsg_cancel(skb, ovs_header);
1320 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1322 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1325 /* Called with rcu_read_lock or ovs_mutex. */
1326 static struct datapath *lookup_datapath(struct net *net,
1327 struct ovs_header *ovs_header,
1328 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1330 struct datapath *dp;
1332 if (!a[OVS_DP_ATTR_NAME])
1333 dp = get_dp(net, ovs_header->dp_ifindex);
1335 struct vport *vport;
1337 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1338 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1340 return dp ? dp : ERR_PTR(-ENODEV);
1343 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1345 struct datapath *dp;
1347 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1351 WARN(dp->user_features, "Dropping previously announced user features\n");
1352 dp->user_features = 0;
1355 static void ovs_dp_change(struct datapath *dp, struct nlattr **a)
1357 if (a[OVS_DP_ATTR_USER_FEATURES])
1358 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1361 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1363 struct nlattr **a = info->attrs;
1364 struct vport_parms parms;
1365 struct sk_buff *reply;
1366 struct datapath *dp;
1367 struct vport *vport;
1368 struct ovs_net *ovs_net;
1372 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1375 reply = ovs_dp_cmd_alloc_info(info);
1380 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1382 goto err_free_reply;
1384 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1386 /* Allocate table. */
1387 err = ovs_flow_tbl_init(&dp->table);
1391 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1392 if (!dp->stats_percpu) {
1394 goto err_destroy_table;
1397 for_each_possible_cpu(i) {
1398 struct dp_stats_percpu *dpath_stats;
1399 dpath_stats = per_cpu_ptr(dp->stats_percpu, i);
1400 u64_stats_init(&dpath_stats->sync);
1403 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1407 goto err_destroy_percpu;
1410 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1411 INIT_HLIST_HEAD(&dp->ports[i]);
1413 /* Set up our datapath device. */
1414 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1415 parms.type = OVS_VPORT_TYPE_INTERNAL;
1416 parms.options = NULL;
1418 parms.port_no = OVSP_LOCAL;
1419 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1421 ovs_dp_change(dp, a);
1423 /* So far only local changes have been made, now need the lock. */
1426 vport = new_vport(&parms);
1427 if (IS_ERR(vport)) {
1428 err = PTR_ERR(vport);
1432 if (err == -EEXIST) {
1433 /* An outdated user space instance that does not understand
1434 * the concept of user_features has attempted to create a new
1435 * datapath and is likely to reuse it. Drop all user features.
1437 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1438 ovs_dp_reset_user_features(skb, info);
1441 goto err_destroy_ports_array;
1444 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1445 info->snd_seq, 0, OVS_DP_CMD_NEW);
1448 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1449 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1453 ovs_notify(&dp_datapath_genl_family, &ovs_dp_datapath_multicast_group, reply, info);
1456 err_destroy_ports_array:
1460 free_percpu(dp->stats_percpu);
1462 ovs_flow_tbl_destroy(&dp->table);
1464 release_net(ovs_dp_get_net(dp));
1472 /* Called with ovs_mutex. */
1473 static void __dp_destroy(struct datapath *dp)
1477 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1478 struct vport *vport;
1479 struct hlist_node *n;
1481 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1482 if (vport->port_no != OVSP_LOCAL)
1483 ovs_dp_detach_port(vport);
1486 list_del_rcu(&dp->list_node);
1488 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1489 * all ports in datapath are destroyed first before freeing datapath.
1491 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1493 /* RCU destroy the flow table */
1494 call_rcu(&dp->rcu, destroy_dp_rcu);
1497 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1499 struct sk_buff *reply;
1500 struct datapath *dp;
1503 reply = ovs_dp_cmd_alloc_info(info);
1508 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1511 goto err_unlock_free;
1513 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1514 info->snd_seq, 0, OVS_DP_CMD_DEL);
1520 ovs_notify(&dp_datapath_genl_family, &ovs_dp_datapath_multicast_group, reply, info);
1529 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1531 struct sk_buff *reply;
1532 struct datapath *dp;
1535 reply = ovs_dp_cmd_alloc_info(info);
1540 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1543 goto err_unlock_free;
1545 ovs_dp_change(dp, info->attrs);
1547 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1548 info->snd_seq, 0, OVS_DP_CMD_NEW);
1552 ovs_notify(&dp_datapath_genl_family, &ovs_dp_datapath_multicast_group, reply, info);
1561 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1563 struct sk_buff *reply;
1564 struct datapath *dp;
1567 reply = ovs_dp_cmd_alloc_info(info);
1572 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1575 goto err_unlock_free;
1577 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1578 info->snd_seq, 0, OVS_DP_CMD_NEW);
1582 return genlmsg_reply(reply, info);
1590 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1592 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1593 struct datapath *dp;
1594 int skip = cb->args[0];
1598 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1600 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1601 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1602 OVS_DP_CMD_NEW) < 0)
1613 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1614 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1615 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1616 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1619 static struct genl_ops dp_datapath_genl_ops[] = {
1620 { .cmd = OVS_DP_CMD_NEW,
1621 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1622 .policy = datapath_policy,
1623 .doit = ovs_dp_cmd_new
1625 { .cmd = OVS_DP_CMD_DEL,
1626 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1627 .policy = datapath_policy,
1628 .doit = ovs_dp_cmd_del
1630 { .cmd = OVS_DP_CMD_GET,
1631 .flags = 0, /* OK for unprivileged users. */
1632 .policy = datapath_policy,
1633 .doit = ovs_dp_cmd_get,
1634 .dumpit = ovs_dp_cmd_dump
1636 { .cmd = OVS_DP_CMD_SET,
1637 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1638 .policy = datapath_policy,
1639 .doit = ovs_dp_cmd_set,
1643 static struct genl_family dp_datapath_genl_family = {
1644 .id = GENL_ID_GENERATE,
1645 .hdrsize = sizeof(struct ovs_header),
1646 .name = OVS_DATAPATH_FAMILY,
1647 .version = OVS_DATAPATH_VERSION,
1648 .maxattr = OVS_DP_ATTR_MAX,
1650 .parallel_ops = true,
1651 .ops = dp_datapath_genl_ops,
1652 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1653 .mcgrps = &ovs_dp_datapath_multicast_group,
1657 /* Called with ovs_mutex or RCU read lock. */
1658 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1659 u32 portid, u32 seq, u32 flags, u8 cmd)
1661 struct ovs_header *ovs_header;
1662 struct ovs_vport_stats vport_stats;
1665 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1670 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1672 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1673 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1674 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)))
1675 goto nla_put_failure;
1677 ovs_vport_get_stats(vport, &vport_stats);
1678 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1680 goto nla_put_failure;
1682 if (ovs_vport_get_upcall_portids(vport, skb))
1683 goto nla_put_failure;
1685 err = ovs_vport_get_options(vport, skb);
1686 if (err == -EMSGSIZE)
1689 return genlmsg_end(skb, ovs_header);
1694 genlmsg_cancel(skb, ovs_header);
1698 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1700 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1703 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1704 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1707 struct sk_buff *skb;
1710 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1712 return ERR_PTR(-ENOMEM);
1714 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1720 /* Called with ovs_mutex or RCU read lock. */
1721 static struct vport *lookup_vport(struct net *net,
1722 struct ovs_header *ovs_header,
1723 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1725 struct datapath *dp;
1726 struct vport *vport;
1728 if (a[OVS_VPORT_ATTR_NAME]) {
1729 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1731 return ERR_PTR(-ENODEV);
1732 if (ovs_header->dp_ifindex &&
1733 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1734 return ERR_PTR(-ENODEV);
1736 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1737 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1739 if (port_no >= DP_MAX_PORTS)
1740 return ERR_PTR(-EFBIG);
1742 dp = get_dp(net, ovs_header->dp_ifindex);
1744 return ERR_PTR(-ENODEV);
1746 vport = ovs_vport_ovsl_rcu(dp, port_no);
1748 return ERR_PTR(-ENODEV);
1751 return ERR_PTR(-EINVAL);
1754 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1756 struct nlattr **a = info->attrs;
1757 struct ovs_header *ovs_header = info->userhdr;
1758 struct vport_parms parms;
1759 struct sk_buff *reply;
1760 struct vport *vport;
1761 struct datapath *dp;
1765 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1766 !a[OVS_VPORT_ATTR_UPCALL_PID])
1769 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1770 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1771 if (port_no >= DP_MAX_PORTS)
1774 reply = ovs_vport_cmd_alloc_info();
1779 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1782 goto exit_unlock_free;
1785 vport = ovs_vport_ovsl(dp, port_no);
1788 goto exit_unlock_free;
1790 for (port_no = 1; ; port_no++) {
1791 if (port_no >= DP_MAX_PORTS) {
1793 goto exit_unlock_free;
1795 vport = ovs_vport_ovsl(dp, port_no);
1801 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1802 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1803 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1805 parms.port_no = port_no;
1806 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1808 vport = new_vport(&parms);
1809 err = PTR_ERR(vport);
1811 goto exit_unlock_free;
1814 if (a[OVS_VPORT_ATTR_STATS])
1815 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
1817 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1818 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1822 ovs_notify(&dp_vport_genl_family, &ovs_dp_vport_multicast_group, reply, info);
1831 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1833 struct nlattr **a = info->attrs;
1834 struct sk_buff *reply;
1835 struct vport *vport;
1838 reply = ovs_vport_cmd_alloc_info();
1843 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1844 err = PTR_ERR(vport);
1846 goto exit_unlock_free;
1848 if (a[OVS_VPORT_ATTR_TYPE] &&
1849 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1851 goto exit_unlock_free;
1854 if (a[OVS_VPORT_ATTR_OPTIONS]) {
1855 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1857 goto exit_unlock_free;
1860 if (a[OVS_VPORT_ATTR_STATS])
1861 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
1864 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
1865 err = ovs_vport_set_upcall_portids(vport,
1866 a[OVS_VPORT_ATTR_UPCALL_PID]);
1868 goto exit_unlock_free;
1871 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1872 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1876 ovs_notify(&dp_vport_genl_family, &ovs_dp_vport_multicast_group, reply, info);
1885 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1887 struct nlattr **a = info->attrs;
1888 struct sk_buff *reply;
1889 struct vport *vport;
1892 reply = ovs_vport_cmd_alloc_info();
1897 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1898 err = PTR_ERR(vport);
1900 goto exit_unlock_free;
1902 if (vport->port_no == OVSP_LOCAL) {
1904 goto exit_unlock_free;
1907 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1908 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
1910 ovs_dp_detach_port(vport);
1913 ovs_notify(&dp_vport_genl_family, &ovs_dp_vport_multicast_group, reply, info);
1922 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1924 struct nlattr **a = info->attrs;
1925 struct ovs_header *ovs_header = info->userhdr;
1926 struct sk_buff *reply;
1927 struct vport *vport;
1930 reply = ovs_vport_cmd_alloc_info();
1935 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1936 err = PTR_ERR(vport);
1938 goto exit_unlock_free;
1939 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1940 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1944 return genlmsg_reply(reply, info);
1952 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1954 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1955 struct datapath *dp;
1956 int bucket = cb->args[0], skip = cb->args[1];
1960 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1965 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1966 struct vport *vport;
1969 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1971 ovs_vport_cmd_fill_info(vport, skb,
1972 NETLINK_CB(cb->skb).portid,
1975 OVS_VPORT_CMD_NEW) < 0)
1991 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1992 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1993 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1994 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1995 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1996 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1997 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2000 static struct genl_ops dp_vport_genl_ops[] = {
2001 { .cmd = OVS_VPORT_CMD_NEW,
2002 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2003 .policy = vport_policy,
2004 .doit = ovs_vport_cmd_new
2006 { .cmd = OVS_VPORT_CMD_DEL,
2007 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2008 .policy = vport_policy,
2009 .doit = ovs_vport_cmd_del
2011 { .cmd = OVS_VPORT_CMD_GET,
2012 .flags = 0, /* OK for unprivileged users. */
2013 .policy = vport_policy,
2014 .doit = ovs_vport_cmd_get,
2015 .dumpit = ovs_vport_cmd_dump
2017 { .cmd = OVS_VPORT_CMD_SET,
2018 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2019 .policy = vport_policy,
2020 .doit = ovs_vport_cmd_set,
2024 struct genl_family dp_vport_genl_family = {
2025 .id = GENL_ID_GENERATE,
2026 .hdrsize = sizeof(struct ovs_header),
2027 .name = OVS_VPORT_FAMILY,
2028 .version = OVS_VPORT_VERSION,
2029 .maxattr = OVS_VPORT_ATTR_MAX,
2031 .parallel_ops = true,
2032 .ops = dp_vport_genl_ops,
2033 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2034 .mcgrps = &ovs_dp_vport_multicast_group,
2038 static struct genl_family *dp_genl_families[] = {
2039 &dp_datapath_genl_family,
2040 &dp_vport_genl_family,
2041 &dp_flow_genl_family,
2042 &dp_packet_genl_family,
2045 static void dp_unregister_genl(int n_families)
2049 for (i = 0; i < n_families; i++)
2050 genl_unregister_family(dp_genl_families[i]);
2053 static int dp_register_genl(void)
2058 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2060 err = genl_register_family(dp_genl_families[i]);
2068 dp_unregister_genl(i);
2072 static int __net_init ovs_init_net(struct net *net)
2074 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2076 INIT_LIST_HEAD(&ovs_net->dps);
2077 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2081 static void __net_exit ovs_exit_net(struct net *net)
2083 struct datapath *dp, *dp_next;
2084 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2087 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2091 cancel_work_sync(&ovs_net->dp_notify_work);
2094 static struct pernet_operations ovs_net_ops = {
2095 .init = ovs_init_net,
2096 .exit = ovs_exit_net,
2098 .size = sizeof(struct ovs_net),
2101 DEFINE_COMPAT_PNET_REG_FUNC(device);
2103 static int __init dp_init(void)
2107 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2109 pr_info("Open vSwitch switching datapath %s, built "__DATE__" "__TIME__"\n",
2112 err = ovs_flow_init();
2116 err = ovs_vport_init();
2118 goto error_flow_exit;
2120 err = register_pernet_device(&ovs_net_ops);
2122 goto error_vport_exit;
2124 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2126 goto error_netns_exit;
2128 err = dp_register_genl();
2130 goto error_unreg_notifier;
2134 error_unreg_notifier:
2135 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2137 unregister_pernet_device(&ovs_net_ops);
2146 static void dp_cleanup(void)
2148 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2149 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2150 unregister_pernet_device(&ovs_net_ops);
2156 module_init(dp_init);
2157 module_exit(dp_cleanup);
2159 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2160 MODULE_LICENSE("GPL");
2161 MODULE_VERSION(VERSION);