1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2007-2014 Nicira, Inc.
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8 #include <linux/init.h>
9 #include <linux/module.h>
10 #include <linux/if_arp.h>
11 #include <linux/if_vlan.h>
14 #include <linux/jhash.h>
15 #include <linux/delay.h>
16 #include <linux/time.h>
17 #include <linux/etherdevice.h>
18 #include <linux/genetlink.h>
19 #include <linux/kernel.h>
20 #include <linux/kthread.h>
21 #include <linux/mutex.h>
22 #include <linux/percpu.h>
23 #include <linux/rcupdate.h>
24 #include <linux/tcp.h>
25 #include <linux/udp.h>
26 #include <linux/ethtool.h>
27 #include <linux/wait.h>
28 #include <asm/div64.h>
29 #include <linux/highmem.h>
30 #include <linux/netfilter_bridge.h>
31 #include <linux/netfilter_ipv4.h>
32 #include <linux/inetdevice.h>
33 #include <linux/list.h>
34 #include <linux/openvswitch.h>
35 #include <linux/rculist.h>
36 #include <linux/dmi.h>
37 #include <net/genetlink.h>
38 #include <net/net_namespace.h>
39 #include <net/netns/generic.h>
40 #include <net/pkt_cls.h>
44 #include "flow_table.h"
45 #include "flow_netlink.h"
47 #include "openvswitch_trace.h"
48 #include "vport-internal_dev.h"
49 #include "vport-netdev.h"
51 unsigned int ovs_net_id __read_mostly;
53 static struct genl_family dp_packet_genl_family;
54 static struct genl_family dp_flow_genl_family;
55 static struct genl_family dp_datapath_genl_family;
57 static const struct nla_policy flow_policy[];
59 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
60 .name = OVS_FLOW_MCGROUP,
63 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
64 .name = OVS_DATAPATH_MCGROUP,
67 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
68 .name = OVS_VPORT_MCGROUP,
71 /* Check if need to build a reply message.
72 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
73 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
76 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
77 genl_has_listeners(family, genl_info_net(info), group);
80 static void ovs_notify(struct genl_family *family,
81 struct sk_buff *skb, struct genl_info *info)
83 genl_notify(family, skb, info, 0, GFP_KERNEL);
89 * All writes e.g. Writes to device state (add/remove datapath, port, set
90 * operations on vports, etc.), Writes to other state (flow table
91 * modifications, set miscellaneous datapath parameters, etc.) are protected
94 * Reads are protected by RCU.
96 * There are a few special cases (mostly stats) that have their own
97 * synchronization but they nest under all of above and don't interact with
100 * The RTNL lock nests inside ovs_mutex.
103 static DEFINE_MUTEX(ovs_mutex);
107 mutex_lock(&ovs_mutex);
110 void ovs_unlock(void)
112 mutex_unlock(&ovs_mutex);
115 #ifdef CONFIG_LOCKDEP
116 int lockdep_ovsl_is_held(void)
119 return lockdep_is_held(&ovs_mutex);
125 static struct vport *new_vport(const struct vport_parms *);
126 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
127 const struct sw_flow_key *,
128 const struct dp_upcall_info *,
130 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
131 const struct sw_flow_key *,
132 const struct dp_upcall_info *,
135 static void ovs_dp_masks_rebalance(struct work_struct *work);
137 static int ovs_dp_set_upcall_portids(struct datapath *, const struct nlattr *);
139 /* Must be called with rcu_read_lock or ovs_mutex. */
140 const char *ovs_dp_name(const struct datapath *dp)
142 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
143 return ovs_vport_name(vport);
146 static int get_dpifindex(const struct datapath *dp)
153 local = ovs_vport_rcu(dp, OVSP_LOCAL);
155 ifindex = local->dev->ifindex;
164 static void destroy_dp_rcu(struct rcu_head *rcu)
166 struct datapath *dp = container_of(rcu, struct datapath, rcu);
168 ovs_flow_tbl_destroy(&dp->table);
169 free_percpu(dp->stats_percpu);
172 kfree(rcu_dereference_raw(dp->upcall_portids));
176 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
179 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
182 /* Called with ovs_mutex or RCU read lock. */
183 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
186 struct hlist_head *head;
188 head = vport_hash_bucket(dp, port_no);
189 hlist_for_each_entry_rcu(vport, head, dp_hash_node,
190 lockdep_ovsl_is_held()) {
191 if (vport->port_no == port_no)
197 /* Called with ovs_mutex. */
198 static struct vport *new_vport(const struct vport_parms *parms)
202 vport = ovs_vport_add(parms);
203 if (!IS_ERR(vport)) {
204 struct datapath *dp = parms->dp;
205 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
207 hlist_add_head_rcu(&vport->dp_hash_node, head);
212 void ovs_dp_detach_port(struct vport *p)
216 /* First drop references to device. */
217 hlist_del_rcu(&p->dp_hash_node);
219 /* Then destroy it. */
223 /* Must be called with rcu_read_lock. */
224 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
226 const struct vport *p = OVS_CB(skb)->input_vport;
227 struct datapath *dp = p->dp;
228 struct sw_flow *flow;
229 struct sw_flow_actions *sf_acts;
230 struct dp_stats_percpu *stats;
236 stats = this_cpu_ptr(dp->stats_percpu);
239 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
240 &n_mask_hit, &n_cache_hit);
241 if (unlikely(!flow)) {
242 struct dp_upcall_info upcall;
244 memset(&upcall, 0, sizeof(upcall));
245 upcall.cmd = OVS_PACKET_CMD_MISS;
247 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU)
249 ovs_dp_get_upcall_portid(dp, smp_processor_id());
251 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
253 upcall.mru = OVS_CB(skb)->mru;
254 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
259 stats_counter = &stats->n_missed;
263 ovs_flow_stats_update(flow, key->tp.flags, skb);
264 sf_acts = rcu_dereference(flow->sf_acts);
265 error = ovs_execute_actions(dp, skb, sf_acts, key);
267 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
268 ovs_dp_name(dp), error);
270 stats_counter = &stats->n_hit;
273 /* Update datapath statistics. */
274 u64_stats_update_begin(&stats->syncp);
276 stats->n_mask_hit += n_mask_hit;
277 stats->n_cache_hit += n_cache_hit;
278 u64_stats_update_end(&stats->syncp);
281 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
282 const struct sw_flow_key *key,
283 const struct dp_upcall_info *upcall_info,
286 struct dp_stats_percpu *stats;
289 if (trace_ovs_dp_upcall_enabled())
290 trace_ovs_dp_upcall(dp, skb, key, upcall_info);
292 if (upcall_info->portid == 0) {
297 if (!skb_is_gso(skb))
298 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
300 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
307 stats = this_cpu_ptr(dp->stats_percpu);
309 u64_stats_update_begin(&stats->syncp);
311 u64_stats_update_end(&stats->syncp);
316 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
317 const struct sw_flow_key *key,
318 const struct dp_upcall_info *upcall_info,
321 unsigned int gso_type = skb_shinfo(skb)->gso_type;
322 struct sw_flow_key later_key;
323 struct sk_buff *segs, *nskb;
326 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET);
327 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
329 return PTR_ERR(segs);
333 if (gso_type & SKB_GSO_UDP) {
334 /* The initial flow key extracted by ovs_flow_key_extract()
335 * in this case is for a first fragment, so we need to
336 * properly mark later fragments.
339 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
342 /* Queue all of the segments. */
343 skb_list_walk_safe(segs, skb, nskb) {
344 if (gso_type & SKB_GSO_UDP && skb != segs)
347 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
353 /* Free all of the segments. */
354 skb_list_walk_safe(segs, skb, nskb) {
363 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
364 unsigned int hdrlen, int actions_attrlen)
366 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
367 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
368 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
369 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
370 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
372 /* OVS_PACKET_ATTR_USERDATA */
373 if (upcall_info->userdata)
374 size += NLA_ALIGN(upcall_info->userdata->nla_len);
376 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
377 if (upcall_info->egress_tun_info)
378 size += nla_total_size(ovs_tun_key_attr_size());
380 /* OVS_PACKET_ATTR_ACTIONS */
381 if (upcall_info->actions_len)
382 size += nla_total_size(actions_attrlen);
384 /* OVS_PACKET_ATTR_MRU */
385 if (upcall_info->mru)
386 size += nla_total_size(sizeof(upcall_info->mru));
391 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
393 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
394 size_t plen = NLA_ALIGN(skb->len) - skb->len;
397 skb_put_zero(skb, plen);
401 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
402 const struct sw_flow_key *key,
403 const struct dp_upcall_info *upcall_info,
406 struct ovs_header *upcall;
407 struct sk_buff *nskb = NULL;
408 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
415 dp_ifindex = get_dpifindex(dp);
419 if (skb_vlan_tag_present(skb)) {
420 nskb = skb_clone(skb, GFP_ATOMIC);
424 nskb = __vlan_hwaccel_push_inside(nskb);
431 if (nla_attr_size(skb->len) > USHRT_MAX) {
436 /* Complete checksum if needed */
437 if (skb->ip_summed == CHECKSUM_PARTIAL &&
438 (err = skb_csum_hwoffload_help(skb, 0)))
441 /* Older versions of OVS user space enforce alignment of the last
442 * Netlink attribute to NLA_ALIGNTO which would require extensive
443 * padding logic. Only perform zerocopy if padding is not required.
445 if (dp->user_features & OVS_DP_F_UNALIGNED)
446 hlen = skb_zerocopy_headlen(skb);
450 len = upcall_msg_size(upcall_info, hlen - cutlen,
451 OVS_CB(skb)->acts_origlen);
452 user_skb = genlmsg_new(len, GFP_ATOMIC);
458 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
459 0, upcall_info->cmd);
464 upcall->dp_ifindex = dp_ifindex;
466 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
470 if (upcall_info->userdata)
471 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
472 nla_len(upcall_info->userdata),
473 nla_data(upcall_info->userdata));
475 if (upcall_info->egress_tun_info) {
476 nla = nla_nest_start_noflag(user_skb,
477 OVS_PACKET_ATTR_EGRESS_TUN_KEY);
482 err = ovs_nla_put_tunnel_info(user_skb,
483 upcall_info->egress_tun_info);
487 nla_nest_end(user_skb, nla);
490 if (upcall_info->actions_len) {
491 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
496 err = ovs_nla_put_actions(upcall_info->actions,
497 upcall_info->actions_len,
500 nla_nest_end(user_skb, nla);
502 nla_nest_cancel(user_skb, nla);
505 /* Add OVS_PACKET_ATTR_MRU */
506 if (upcall_info->mru &&
507 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
512 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
514 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
519 /* Add OVS_PACKET_ATTR_HASH */
520 hash = skb_get_hash_raw(skb);
522 hash |= OVS_PACKET_HASH_SW_BIT;
525 hash |= OVS_PACKET_HASH_L4_BIT;
527 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
532 /* Only reserve room for attribute header, packet data is added
533 * in skb_zerocopy() */
534 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
538 nla->nla_len = nla_attr_size(skb->len - cutlen);
540 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
544 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
545 pad_packet(dp, user_skb);
547 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
549 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
559 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
561 struct ovs_header *ovs_header = info->userhdr;
562 struct net *net = sock_net(skb->sk);
563 struct nlattr **a = info->attrs;
564 struct sw_flow_actions *acts;
565 struct sk_buff *packet;
566 struct sw_flow *flow;
567 struct sw_flow_actions *sf_acts;
569 struct vport *input_vport;
574 bool log = !a[OVS_PACKET_ATTR_PROBE];
577 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
578 !a[OVS_PACKET_ATTR_ACTIONS])
581 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
582 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
586 skb_reserve(packet, NET_IP_ALIGN);
588 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
590 /* Set packet's mru */
591 if (a[OVS_PACKET_ATTR_MRU]) {
592 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
593 packet->ignore_df = 1;
595 OVS_CB(packet)->mru = mru;
597 if (a[OVS_PACKET_ATTR_HASH]) {
598 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
600 __skb_set_hash(packet, hash & 0xFFFFFFFFULL,
601 !!(hash & OVS_PACKET_HASH_SW_BIT),
602 !!(hash & OVS_PACKET_HASH_L4_BIT));
605 /* Build an sw_flow for sending this packet. */
606 flow = ovs_flow_alloc();
611 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
612 packet, &flow->key, log);
616 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
617 &flow->key, &acts, log);
621 rcu_assign_pointer(flow->sf_acts, acts);
622 packet->priority = flow->key.phy.priority;
623 packet->mark = flow->key.phy.skb_mark;
626 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
631 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
633 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
638 packet->dev = input_vport->dev;
639 OVS_CB(packet)->input_vport = input_vport;
640 sf_acts = rcu_dereference(flow->sf_acts);
643 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
647 ovs_flow_free(flow, false);
653 ovs_flow_free(flow, false);
660 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
661 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
662 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
663 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
664 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
665 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
666 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
669 static const struct genl_small_ops dp_packet_genl_ops[] = {
670 { .cmd = OVS_PACKET_CMD_EXECUTE,
671 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
672 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
673 .doit = ovs_packet_cmd_execute
677 static struct genl_family dp_packet_genl_family __ro_after_init = {
678 .hdrsize = sizeof(struct ovs_header),
679 .name = OVS_PACKET_FAMILY,
680 .version = OVS_PACKET_VERSION,
681 .maxattr = OVS_PACKET_ATTR_MAX,
682 .policy = packet_policy,
684 .parallel_ops = true,
685 .small_ops = dp_packet_genl_ops,
686 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops),
687 .module = THIS_MODULE,
690 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
691 struct ovs_dp_megaflow_stats *mega_stats)
695 memset(mega_stats, 0, sizeof(*mega_stats));
697 stats->n_flows = ovs_flow_tbl_count(&dp->table);
698 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
700 stats->n_hit = stats->n_missed = stats->n_lost = 0;
702 for_each_possible_cpu(i) {
703 const struct dp_stats_percpu *percpu_stats;
704 struct dp_stats_percpu local_stats;
707 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
710 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
711 local_stats = *percpu_stats;
712 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
714 stats->n_hit += local_stats.n_hit;
715 stats->n_missed += local_stats.n_missed;
716 stats->n_lost += local_stats.n_lost;
717 mega_stats->n_mask_hit += local_stats.n_mask_hit;
718 mega_stats->n_cache_hit += local_stats.n_cache_hit;
722 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
724 return ovs_identifier_is_ufid(sfid) &&
725 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
728 static bool should_fill_mask(uint32_t ufid_flags)
730 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
733 static bool should_fill_actions(uint32_t ufid_flags)
735 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
738 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
739 const struct sw_flow_id *sfid,
742 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
744 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
745 * see ovs_nla_put_identifier()
747 if (sfid && ovs_identifier_is_ufid(sfid))
748 len += nla_total_size(sfid->ufid_len);
750 len += nla_total_size(ovs_key_attr_size());
752 /* OVS_FLOW_ATTR_KEY */
753 if (!sfid || should_fill_key(sfid, ufid_flags))
754 len += nla_total_size(ovs_key_attr_size());
756 /* OVS_FLOW_ATTR_MASK */
757 if (should_fill_mask(ufid_flags))
758 len += nla_total_size(ovs_key_attr_size());
760 /* OVS_FLOW_ATTR_ACTIONS */
761 if (should_fill_actions(ufid_flags))
762 len += nla_total_size(acts->orig_len);
765 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
766 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
767 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
770 /* Called with ovs_mutex or RCU read lock. */
771 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
774 struct ovs_flow_stats stats;
778 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
781 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
785 if (stats.n_packets &&
786 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
787 sizeof(struct ovs_flow_stats), &stats,
791 if ((u8)ntohs(tcp_flags) &&
792 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
798 /* Called with ovs_mutex or RCU read lock. */
799 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
800 struct sk_buff *skb, int skb_orig_len)
802 struct nlattr *start;
805 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
806 * this is the first flow to be dumped into 'skb'. This is unusual for
807 * Netlink but individual action lists can be longer than
808 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
809 * The userspace caller can always fetch the actions separately if it
810 * really wants them. (Most userspace callers in fact don't care.)
812 * This can only fail for dump operations because the skb is always
813 * properly sized for single flows.
815 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
817 const struct sw_flow_actions *sf_acts;
819 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
820 err = ovs_nla_put_actions(sf_acts->actions,
821 sf_acts->actions_len, skb);
824 nla_nest_end(skb, start);
829 nla_nest_cancel(skb, start);
831 } else if (skb_orig_len) {
838 /* Called with ovs_mutex or RCU read lock. */
839 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
840 struct sk_buff *skb, u32 portid,
841 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
843 const int skb_orig_len = skb->len;
844 struct ovs_header *ovs_header;
847 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
852 ovs_header->dp_ifindex = dp_ifindex;
854 err = ovs_nla_put_identifier(flow, skb);
858 if (should_fill_key(&flow->id, ufid_flags)) {
859 err = ovs_nla_put_masked_key(flow, skb);
864 if (should_fill_mask(ufid_flags)) {
865 err = ovs_nla_put_mask(flow, skb);
870 err = ovs_flow_cmd_fill_stats(flow, skb);
874 if (should_fill_actions(ufid_flags)) {
875 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
880 genlmsg_end(skb, ovs_header);
884 genlmsg_cancel(skb, ovs_header);
888 /* May not be called with RCU read lock. */
889 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
890 const struct sw_flow_id *sfid,
891 struct genl_info *info,
898 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
901 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
902 skb = genlmsg_new(len, GFP_KERNEL);
904 return ERR_PTR(-ENOMEM);
909 /* Called with ovs_mutex. */
910 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
912 struct genl_info *info, u8 cmd,
913 bool always, u32 ufid_flags)
918 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
919 &flow->id, info, always, ufid_flags);
920 if (IS_ERR_OR_NULL(skb))
923 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
924 info->snd_portid, info->snd_seq, 0,
926 if (WARN_ON_ONCE(retval < 0)) {
928 skb = ERR_PTR(retval);
933 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
935 struct net *net = sock_net(skb->sk);
936 struct nlattr **a = info->attrs;
937 struct ovs_header *ovs_header = info->userhdr;
938 struct sw_flow *flow = NULL, *new_flow;
939 struct sw_flow_mask mask;
940 struct sk_buff *reply;
942 struct sw_flow_actions *acts;
943 struct sw_flow_match match;
944 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
946 bool log = !a[OVS_FLOW_ATTR_PROBE];
948 /* Must have key and actions. */
950 if (!a[OVS_FLOW_ATTR_KEY]) {
951 OVS_NLERR(log, "Flow key attr not present in new flow.");
954 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
955 OVS_NLERR(log, "Flow actions attr not present in new flow.");
959 /* Most of the time we need to allocate a new flow, do it before
962 new_flow = ovs_flow_alloc();
963 if (IS_ERR(new_flow)) {
964 error = PTR_ERR(new_flow);
969 ovs_match_init(&match, &new_flow->key, false, &mask);
970 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
971 a[OVS_FLOW_ATTR_MASK], log);
975 /* Extract flow identifier. */
976 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
977 &new_flow->key, log);
981 /* unmasked key is needed to match when ufid is not used. */
982 if (ovs_identifier_is_key(&new_flow->id))
983 match.key = new_flow->id.unmasked_key;
985 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
987 /* Validate actions. */
988 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
989 &new_flow->key, &acts, log);
991 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
995 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
998 error = PTR_ERR(reply);
1003 dp = get_dp(net, ovs_header->dp_ifindex);
1004 if (unlikely(!dp)) {
1006 goto err_unlock_ovs;
1009 /* Check if this is a duplicate flow */
1010 if (ovs_identifier_is_ufid(&new_flow->id))
1011 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
1013 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
1014 if (likely(!flow)) {
1015 rcu_assign_pointer(new_flow->sf_acts, acts);
1017 /* Put flow in bucket. */
1018 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1019 if (unlikely(error)) {
1021 goto err_unlock_ovs;
1024 if (unlikely(reply)) {
1025 error = ovs_flow_cmd_fill_info(new_flow,
1026 ovs_header->dp_ifindex,
1027 reply, info->snd_portid,
1035 struct sw_flow_actions *old_acts;
1037 /* Bail out if we're not allowed to modify an existing flow.
1038 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1039 * because Generic Netlink treats the latter as a dump
1040 * request. We also accept NLM_F_EXCL in case that bug ever
1043 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1046 goto err_unlock_ovs;
1048 /* The flow identifier has to be the same for flow updates.
1049 * Look for any overlapping flow.
1051 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1052 if (ovs_identifier_is_key(&flow->id))
1053 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1055 else /* UFID matches but key is different */
1059 goto err_unlock_ovs;
1062 /* Update actions. */
1063 old_acts = ovsl_dereference(flow->sf_acts);
1064 rcu_assign_pointer(flow->sf_acts, acts);
1066 if (unlikely(reply)) {
1067 error = ovs_flow_cmd_fill_info(flow,
1068 ovs_header->dp_ifindex,
1069 reply, info->snd_portid,
1077 ovs_nla_free_flow_actions_rcu(old_acts);
1078 ovs_flow_free(new_flow, false);
1082 ovs_notify(&dp_flow_genl_family, reply, info);
1089 ovs_nla_free_flow_actions(acts);
1091 ovs_flow_free(new_flow, false);
1096 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1097 static noinline_for_stack
1098 struct sw_flow_actions *get_flow_actions(struct net *net,
1099 const struct nlattr *a,
1100 const struct sw_flow_key *key,
1101 const struct sw_flow_mask *mask,
1104 struct sw_flow_actions *acts;
1105 struct sw_flow_key masked_key;
1108 ovs_flow_mask_key(&masked_key, key, true, mask);
1109 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1112 "Actions may not be safe on all matching packets");
1113 return ERR_PTR(error);
1119 /* Factor out match-init and action-copy to avoid
1120 * "Wframe-larger-than=1024" warning. Because mask is only
1121 * used to get actions, we new a function to save some
1124 * If there are not key and action attrs, we return 0
1125 * directly. In the case, the caller will also not use the
1126 * match as before. If there is action attr, we try to get
1127 * actions and save them to *acts. Before returning from
1128 * the function, we reset the match->mask pointer. Because
1129 * we should not to return match object with dangling reference
1132 static noinline_for_stack int
1133 ovs_nla_init_match_and_action(struct net *net,
1134 struct sw_flow_match *match,
1135 struct sw_flow_key *key,
1137 struct sw_flow_actions **acts,
1140 struct sw_flow_mask mask;
1143 if (a[OVS_FLOW_ATTR_KEY]) {
1144 ovs_match_init(match, key, true, &mask);
1145 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1146 a[OVS_FLOW_ATTR_MASK], log);
1151 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1152 if (!a[OVS_FLOW_ATTR_KEY]) {
1154 "Flow key attribute not present in set flow.");
1159 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1161 if (IS_ERR(*acts)) {
1162 error = PTR_ERR(*acts);
1167 /* On success, error is 0. */
1173 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1175 struct net *net = sock_net(skb->sk);
1176 struct nlattr **a = info->attrs;
1177 struct ovs_header *ovs_header = info->userhdr;
1178 struct sw_flow_key key;
1179 struct sw_flow *flow;
1180 struct sk_buff *reply = NULL;
1181 struct datapath *dp;
1182 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1183 struct sw_flow_match match;
1184 struct sw_flow_id sfid;
1185 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1187 bool log = !a[OVS_FLOW_ATTR_PROBE];
1190 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1191 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1193 "Flow set message rejected, Key attribute missing.");
1197 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1203 /* Can allocate before locking if have acts. */
1204 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1206 if (IS_ERR(reply)) {
1207 error = PTR_ERR(reply);
1208 goto err_kfree_acts;
1213 dp = get_dp(net, ovs_header->dp_ifindex);
1214 if (unlikely(!dp)) {
1216 goto err_unlock_ovs;
1218 /* Check that the flow exists. */
1220 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1222 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1223 if (unlikely(!flow)) {
1225 goto err_unlock_ovs;
1228 /* Update actions, if present. */
1230 old_acts = ovsl_dereference(flow->sf_acts);
1231 rcu_assign_pointer(flow->sf_acts, acts);
1233 if (unlikely(reply)) {
1234 error = ovs_flow_cmd_fill_info(flow,
1235 ovs_header->dp_ifindex,
1236 reply, info->snd_portid,
1243 /* Could not alloc without acts before locking. */
1244 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1245 info, OVS_FLOW_CMD_SET, false,
1248 if (IS_ERR(reply)) {
1249 error = PTR_ERR(reply);
1250 goto err_unlock_ovs;
1255 if (a[OVS_FLOW_ATTR_CLEAR])
1256 ovs_flow_stats_clear(flow);
1260 ovs_notify(&dp_flow_genl_family, reply, info);
1262 ovs_nla_free_flow_actions_rcu(old_acts);
1270 ovs_nla_free_flow_actions(acts);
1275 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1277 struct nlattr **a = info->attrs;
1278 struct ovs_header *ovs_header = info->userhdr;
1279 struct net *net = sock_net(skb->sk);
1280 struct sw_flow_key key;
1281 struct sk_buff *reply;
1282 struct sw_flow *flow;
1283 struct datapath *dp;
1284 struct sw_flow_match match;
1285 struct sw_flow_id ufid;
1286 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1288 bool log = !a[OVS_FLOW_ATTR_PROBE];
1291 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1292 if (a[OVS_FLOW_ATTR_KEY]) {
1293 ovs_match_init(&match, &key, true, NULL);
1294 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1296 } else if (!ufid_present) {
1298 "Flow get message rejected, Key attribute missing.");
1305 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1312 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1314 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1320 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1321 OVS_FLOW_CMD_GET, true, ufid_flags);
1322 if (IS_ERR(reply)) {
1323 err = PTR_ERR(reply);
1328 return genlmsg_reply(reply, info);
1334 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1336 struct nlattr **a = info->attrs;
1337 struct ovs_header *ovs_header = info->userhdr;
1338 struct net *net = sock_net(skb->sk);
1339 struct sw_flow_key key;
1340 struct sk_buff *reply;
1341 struct sw_flow *flow = NULL;
1342 struct datapath *dp;
1343 struct sw_flow_match match;
1344 struct sw_flow_id ufid;
1345 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1347 bool log = !a[OVS_FLOW_ATTR_PROBE];
1350 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1351 if (a[OVS_FLOW_ATTR_KEY]) {
1352 ovs_match_init(&match, &key, true, NULL);
1353 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1360 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1361 if (unlikely(!dp)) {
1366 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1367 err = ovs_flow_tbl_flush(&dp->table);
1372 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1374 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1375 if (unlikely(!flow)) {
1380 ovs_flow_tbl_remove(&dp->table, flow);
1383 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1384 &flow->id, info, false, ufid_flags);
1385 if (likely(reply)) {
1386 if (!IS_ERR(reply)) {
1387 rcu_read_lock(); /*To keep RCU checker happy. */
1388 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1389 reply, info->snd_portid,
1394 if (WARN_ON_ONCE(err < 0)) {
1399 ovs_notify(&dp_flow_genl_family, reply, info);
1401 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0,
1407 ovs_flow_free(flow, true);
1414 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1416 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1417 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1418 struct table_instance *ti;
1419 struct datapath *dp;
1423 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1424 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1427 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1430 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1436 ti = rcu_dereference(dp->table.ti);
1438 struct sw_flow *flow;
1441 bucket = cb->args[0];
1443 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1447 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1448 NETLINK_CB(cb->skb).portid,
1449 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1450 OVS_FLOW_CMD_GET, ufid_flags) < 0)
1453 cb->args[0] = bucket;
1460 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1461 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1462 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1463 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1464 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1465 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1466 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1467 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1470 static const struct genl_small_ops dp_flow_genl_ops[] = {
1471 { .cmd = OVS_FLOW_CMD_NEW,
1472 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1473 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1474 .doit = ovs_flow_cmd_new
1476 { .cmd = OVS_FLOW_CMD_DEL,
1477 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1478 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1479 .doit = ovs_flow_cmd_del
1481 { .cmd = OVS_FLOW_CMD_GET,
1482 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1483 .flags = 0, /* OK for unprivileged users. */
1484 .doit = ovs_flow_cmd_get,
1485 .dumpit = ovs_flow_cmd_dump
1487 { .cmd = OVS_FLOW_CMD_SET,
1488 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1489 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1490 .doit = ovs_flow_cmd_set,
1494 static struct genl_family dp_flow_genl_family __ro_after_init = {
1495 .hdrsize = sizeof(struct ovs_header),
1496 .name = OVS_FLOW_FAMILY,
1497 .version = OVS_FLOW_VERSION,
1498 .maxattr = OVS_FLOW_ATTR_MAX,
1499 .policy = flow_policy,
1501 .parallel_ops = true,
1502 .small_ops = dp_flow_genl_ops,
1503 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops),
1504 .mcgrps = &ovs_dp_flow_multicast_group,
1506 .module = THIS_MODULE,
1509 static size_t ovs_dp_cmd_msg_size(void)
1511 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1513 msgsize += nla_total_size(IFNAMSIZ);
1514 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1515 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1516 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1517 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
1522 /* Called with ovs_mutex. */
1523 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1524 u32 portid, u32 seq, u32 flags, u8 cmd)
1526 struct ovs_header *ovs_header;
1527 struct ovs_dp_stats dp_stats;
1528 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1531 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1536 ovs_header->dp_ifindex = get_dpifindex(dp);
1538 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1540 goto nla_put_failure;
1542 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1543 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1544 &dp_stats, OVS_DP_ATTR_PAD))
1545 goto nla_put_failure;
1547 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1548 sizeof(struct ovs_dp_megaflow_stats),
1549 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1550 goto nla_put_failure;
1552 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1553 goto nla_put_failure;
1555 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE,
1556 ovs_flow_tbl_masks_cache_size(&dp->table)))
1557 goto nla_put_failure;
1559 genlmsg_end(skb, ovs_header);
1563 genlmsg_cancel(skb, ovs_header);
1568 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1570 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1573 /* Called with rcu_read_lock or ovs_mutex. */
1574 static struct datapath *lookup_datapath(struct net *net,
1575 const struct ovs_header *ovs_header,
1576 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1578 struct datapath *dp;
1580 if (!a[OVS_DP_ATTR_NAME])
1581 dp = get_dp(net, ovs_header->dp_ifindex);
1583 struct vport *vport;
1585 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1586 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1588 return dp ? dp : ERR_PTR(-ENODEV);
1591 static void ovs_dp_reset_user_features(struct sk_buff *skb,
1592 struct genl_info *info)
1594 struct datapath *dp;
1596 dp = lookup_datapath(sock_net(skb->sk), info->userhdr,
1601 WARN(dp->user_features, "Dropping previously announced user features\n");
1602 dp->user_features = 0;
1605 static int ovs_dp_set_upcall_portids(struct datapath *dp,
1606 const struct nlattr *ids)
1608 struct dp_nlsk_pids *old, *dp_nlsk_pids;
1610 if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
1613 old = ovsl_dereference(dp->upcall_portids);
1615 dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids),
1620 dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32);
1621 nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids));
1623 rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids);
1625 kfree_rcu(old, rcu);
1630 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id)
1632 struct dp_nlsk_pids *dp_nlsk_pids;
1634 dp_nlsk_pids = rcu_dereference(dp->upcall_portids);
1637 if (cpu_id < dp_nlsk_pids->n_pids) {
1638 return dp_nlsk_pids->pids[cpu_id];
1639 } else if (dp_nlsk_pids->n_pids > 0 &&
1640 cpu_id >= dp_nlsk_pids->n_pids) {
1641 /* If the number of netlink PIDs is mismatched with
1642 * the number of CPUs as seen by the kernel, log this
1643 * and send the upcall to an arbitrary socket (0) in
1644 * order to not drop packets
1646 pr_info_ratelimited("cpu_id mismatch with handler threads");
1647 return dp_nlsk_pids->pids[cpu_id %
1648 dp_nlsk_pids->n_pids];
1657 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1659 u32 user_features = 0, old_features = dp->user_features;
1662 if (a[OVS_DP_ATTR_USER_FEATURES]) {
1663 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1665 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1666 OVS_DP_F_UNALIGNED |
1667 OVS_DP_F_TC_RECIRC_SHARING |
1668 OVS_DP_F_DISPATCH_UPCALL_PER_CPU))
1671 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1672 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1677 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
1681 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
1682 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size);
1687 dp->user_features = user_features;
1689 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU &&
1690 a[OVS_DP_ATTR_PER_CPU_PIDS]) {
1691 /* Upcall Netlink Port IDs have been updated */
1692 err = ovs_dp_set_upcall_portids(dp,
1693 a[OVS_DP_ATTR_PER_CPU_PIDS]);
1698 if ((dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1699 !(old_features & OVS_DP_F_TC_RECIRC_SHARING))
1700 tc_skb_ext_tc_enable();
1701 else if (!(dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1702 (old_features & OVS_DP_F_TC_RECIRC_SHARING))
1703 tc_skb_ext_tc_disable();
1708 static int ovs_dp_stats_init(struct datapath *dp)
1710 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1711 if (!dp->stats_percpu)
1717 static int ovs_dp_vport_init(struct datapath *dp)
1721 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1722 sizeof(struct hlist_head),
1727 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1728 INIT_HLIST_HEAD(&dp->ports[i]);
1733 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1735 struct nlattr **a = info->attrs;
1736 struct vport_parms parms;
1737 struct sk_buff *reply;
1738 struct datapath *dp;
1739 struct vport *vport;
1740 struct ovs_net *ovs_net;
1744 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1747 reply = ovs_dp_cmd_alloc_info();
1752 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1754 goto err_destroy_reply;
1756 ovs_dp_set_net(dp, sock_net(skb->sk));
1758 /* Allocate table. */
1759 err = ovs_flow_tbl_init(&dp->table);
1761 goto err_destroy_dp;
1763 err = ovs_dp_stats_init(dp);
1765 goto err_destroy_table;
1767 err = ovs_dp_vport_init(dp);
1769 goto err_destroy_stats;
1771 err = ovs_meters_init(dp);
1773 goto err_destroy_ports;
1775 /* Set up our datapath device. */
1776 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1777 parms.type = OVS_VPORT_TYPE_INTERNAL;
1778 parms.options = NULL;
1780 parms.port_no = OVSP_LOCAL;
1781 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1783 /* So far only local changes have been made, now need the lock. */
1786 err = ovs_dp_change(dp, a);
1788 goto err_unlock_and_destroy_meters;
1790 vport = new_vport(&parms);
1791 if (IS_ERR(vport)) {
1792 err = PTR_ERR(vport);
1796 if (err == -EEXIST) {
1797 /* An outdated user space instance that does not understand
1798 * the concept of user_features has attempted to create a new
1799 * datapath and is likely to reuse it. Drop all user features.
1801 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1802 ovs_dp_reset_user_features(skb, info);
1805 goto err_unlock_and_destroy_meters;
1808 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1809 info->snd_seq, 0, OVS_DP_CMD_NEW);
1812 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1813 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1817 ovs_notify(&dp_datapath_genl_family, reply, info);
1820 err_unlock_and_destroy_meters:
1822 ovs_meters_exit(dp);
1826 free_percpu(dp->stats_percpu);
1828 ovs_flow_tbl_destroy(&dp->table);
1837 /* Called with ovs_mutex. */
1838 static void __dp_destroy(struct datapath *dp)
1840 struct flow_table *table = &dp->table;
1843 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1844 tc_skb_ext_tc_disable();
1846 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1847 struct vport *vport;
1848 struct hlist_node *n;
1850 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1851 if (vport->port_no != OVSP_LOCAL)
1852 ovs_dp_detach_port(vport);
1855 list_del_rcu(&dp->list_node);
1857 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1858 * all ports in datapath are destroyed first before freeing datapath.
1860 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1862 /* Flush sw_flow in the tables. RCU cb only releases resource
1863 * such as dp, ports and tables. That may avoid some issues
1864 * such as RCU usage warning.
1866 table_instance_flow_flush(table, ovsl_dereference(table->ti),
1867 ovsl_dereference(table->ufid_ti));
1869 /* RCU destroy the ports, meters and flow tables. */
1870 call_rcu(&dp->rcu, destroy_dp_rcu);
1873 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1875 struct sk_buff *reply;
1876 struct datapath *dp;
1879 reply = ovs_dp_cmd_alloc_info();
1884 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1887 goto err_unlock_free;
1889 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1890 info->snd_seq, 0, OVS_DP_CMD_DEL);
1896 ovs_notify(&dp_datapath_genl_family, reply, info);
1906 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1908 struct sk_buff *reply;
1909 struct datapath *dp;
1912 reply = ovs_dp_cmd_alloc_info();
1917 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1920 goto err_unlock_free;
1922 err = ovs_dp_change(dp, info->attrs);
1924 goto err_unlock_free;
1926 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1927 info->snd_seq, 0, OVS_DP_CMD_SET);
1931 ovs_notify(&dp_datapath_genl_family, reply, info);
1941 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1943 struct sk_buff *reply;
1944 struct datapath *dp;
1947 reply = ovs_dp_cmd_alloc_info();
1952 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1955 goto err_unlock_free;
1957 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1958 info->snd_seq, 0, OVS_DP_CMD_GET);
1962 return genlmsg_reply(reply, info);
1970 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1972 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1973 struct datapath *dp;
1974 int skip = cb->args[0];
1978 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1980 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1981 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1982 OVS_DP_CMD_GET) < 0)
1993 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1994 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1995 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1996 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1997 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0,
1998 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
2001 static const struct genl_small_ops dp_datapath_genl_ops[] = {
2002 { .cmd = OVS_DP_CMD_NEW,
2003 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2004 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2005 .doit = ovs_dp_cmd_new
2007 { .cmd = OVS_DP_CMD_DEL,
2008 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2009 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2010 .doit = ovs_dp_cmd_del
2012 { .cmd = OVS_DP_CMD_GET,
2013 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2014 .flags = 0, /* OK for unprivileged users. */
2015 .doit = ovs_dp_cmd_get,
2016 .dumpit = ovs_dp_cmd_dump
2018 { .cmd = OVS_DP_CMD_SET,
2019 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2020 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2021 .doit = ovs_dp_cmd_set,
2025 static struct genl_family dp_datapath_genl_family __ro_after_init = {
2026 .hdrsize = sizeof(struct ovs_header),
2027 .name = OVS_DATAPATH_FAMILY,
2028 .version = OVS_DATAPATH_VERSION,
2029 .maxattr = OVS_DP_ATTR_MAX,
2030 .policy = datapath_policy,
2032 .parallel_ops = true,
2033 .small_ops = dp_datapath_genl_ops,
2034 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops),
2035 .mcgrps = &ovs_dp_datapath_multicast_group,
2037 .module = THIS_MODULE,
2040 /* Called with ovs_mutex or RCU read lock. */
2041 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
2042 struct net *net, u32 portid, u32 seq,
2043 u32 flags, u8 cmd, gfp_t gfp)
2045 struct ovs_header *ovs_header;
2046 struct ovs_vport_stats vport_stats;
2049 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
2054 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
2056 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
2057 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
2058 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
2059 ovs_vport_name(vport)) ||
2060 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
2061 goto nla_put_failure;
2063 if (!net_eq(net, dev_net(vport->dev))) {
2064 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
2066 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
2067 goto nla_put_failure;
2070 ovs_vport_get_stats(vport, &vport_stats);
2071 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
2072 sizeof(struct ovs_vport_stats), &vport_stats,
2073 OVS_VPORT_ATTR_PAD))
2074 goto nla_put_failure;
2076 if (ovs_vport_get_upcall_portids(vport, skb))
2077 goto nla_put_failure;
2079 err = ovs_vport_get_options(vport, skb);
2080 if (err == -EMSGSIZE)
2083 genlmsg_end(skb, ovs_header);
2089 genlmsg_cancel(skb, ovs_header);
2093 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
2095 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2098 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
2099 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
2100 u32 portid, u32 seq, u8 cmd)
2102 struct sk_buff *skb;
2105 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2107 return ERR_PTR(-ENOMEM);
2109 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
2116 /* Called with ovs_mutex or RCU read lock. */
2117 static struct vport *lookup_vport(struct net *net,
2118 const struct ovs_header *ovs_header,
2119 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2121 struct datapath *dp;
2122 struct vport *vport;
2124 if (a[OVS_VPORT_ATTR_IFINDEX])
2125 return ERR_PTR(-EOPNOTSUPP);
2126 if (a[OVS_VPORT_ATTR_NAME]) {
2127 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2129 return ERR_PTR(-ENODEV);
2130 if (ovs_header->dp_ifindex &&
2131 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2132 return ERR_PTR(-ENODEV);
2134 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2135 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2137 if (port_no >= DP_MAX_PORTS)
2138 return ERR_PTR(-EFBIG);
2140 dp = get_dp(net, ovs_header->dp_ifindex);
2142 return ERR_PTR(-ENODEV);
2144 vport = ovs_vport_ovsl_rcu(dp, port_no);
2146 return ERR_PTR(-ENODEV);
2149 return ERR_PTR(-EINVAL);
2153 static unsigned int ovs_get_max_headroom(struct datapath *dp)
2155 unsigned int dev_headroom, max_headroom = 0;
2156 struct net_device *dev;
2157 struct vport *vport;
2160 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2161 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2162 lockdep_ovsl_is_held()) {
2164 dev_headroom = netdev_get_fwd_headroom(dev);
2165 if (dev_headroom > max_headroom)
2166 max_headroom = dev_headroom;
2170 return max_headroom;
2173 /* Called with ovs_mutex */
2174 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2176 struct vport *vport;
2179 dp->max_headroom = new_headroom;
2180 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2181 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2182 lockdep_ovsl_is_held())
2183 netdev_set_rx_headroom(vport->dev, new_headroom);
2187 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2189 struct nlattr **a = info->attrs;
2190 struct ovs_header *ovs_header = info->userhdr;
2191 struct vport_parms parms;
2192 struct sk_buff *reply;
2193 struct vport *vport;
2194 struct datapath *dp;
2195 unsigned int new_headroom;
2199 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2200 !a[OVS_VPORT_ATTR_UPCALL_PID])
2202 if (a[OVS_VPORT_ATTR_IFINDEX])
2205 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2206 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2207 if (port_no >= DP_MAX_PORTS)
2210 reply = ovs_vport_cmd_alloc_info();
2216 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2219 goto exit_unlock_free;
2222 vport = ovs_vport_ovsl(dp, port_no);
2225 goto exit_unlock_free;
2227 for (port_no = 1; ; port_no++) {
2228 if (port_no >= DP_MAX_PORTS) {
2230 goto exit_unlock_free;
2232 vport = ovs_vport_ovsl(dp, port_no);
2238 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2239 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2240 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2242 parms.port_no = port_no;
2243 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2245 vport = new_vport(&parms);
2246 err = PTR_ERR(vport);
2247 if (IS_ERR(vport)) {
2250 goto exit_unlock_free;
2253 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2254 info->snd_portid, info->snd_seq, 0,
2255 OVS_VPORT_CMD_NEW, GFP_KERNEL);
2257 new_headroom = netdev_get_fwd_headroom(vport->dev);
2259 if (new_headroom > dp->max_headroom)
2260 ovs_update_headroom(dp, new_headroom);
2262 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2267 ovs_notify(&dp_vport_genl_family, reply, info);
2276 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2278 struct nlattr **a = info->attrs;
2279 struct sk_buff *reply;
2280 struct vport *vport;
2283 reply = ovs_vport_cmd_alloc_info();
2288 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2289 err = PTR_ERR(vport);
2291 goto exit_unlock_free;
2293 if (a[OVS_VPORT_ATTR_TYPE] &&
2294 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2296 goto exit_unlock_free;
2299 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2300 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2302 goto exit_unlock_free;
2306 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2307 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2309 err = ovs_vport_set_upcall_portids(vport, ids);
2311 goto exit_unlock_free;
2314 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2315 info->snd_portid, info->snd_seq, 0,
2316 OVS_VPORT_CMD_SET, GFP_KERNEL);
2320 ovs_notify(&dp_vport_genl_family, reply, info);
2329 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2331 bool update_headroom = false;
2332 struct nlattr **a = info->attrs;
2333 struct sk_buff *reply;
2334 struct datapath *dp;
2335 struct vport *vport;
2336 unsigned int new_headroom;
2339 reply = ovs_vport_cmd_alloc_info();
2344 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2345 err = PTR_ERR(vport);
2347 goto exit_unlock_free;
2349 if (vport->port_no == OVSP_LOCAL) {
2351 goto exit_unlock_free;
2354 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2355 info->snd_portid, info->snd_seq, 0,
2356 OVS_VPORT_CMD_DEL, GFP_KERNEL);
2359 /* the vport deletion may trigger dp headroom update */
2361 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2362 update_headroom = true;
2364 netdev_reset_rx_headroom(vport->dev);
2365 ovs_dp_detach_port(vport);
2367 if (update_headroom) {
2368 new_headroom = ovs_get_max_headroom(dp);
2370 if (new_headroom < dp->max_headroom)
2371 ovs_update_headroom(dp, new_headroom);
2375 ovs_notify(&dp_vport_genl_family, reply, info);
2384 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2386 struct nlattr **a = info->attrs;
2387 struct ovs_header *ovs_header = info->userhdr;
2388 struct sk_buff *reply;
2389 struct vport *vport;
2392 reply = ovs_vport_cmd_alloc_info();
2397 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2398 err = PTR_ERR(vport);
2400 goto exit_unlock_free;
2401 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2402 info->snd_portid, info->snd_seq, 0,
2403 OVS_VPORT_CMD_GET, GFP_ATOMIC);
2407 return genlmsg_reply(reply, info);
2415 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2417 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2418 struct datapath *dp;
2419 int bucket = cb->args[0], skip = cb->args[1];
2423 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2428 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2429 struct vport *vport;
2432 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2434 ovs_vport_cmd_fill_info(vport, skb,
2436 NETLINK_CB(cb->skb).portid,
2456 static void ovs_dp_masks_rebalance(struct work_struct *work)
2458 struct ovs_net *ovs_net = container_of(work, struct ovs_net,
2459 masks_rebalance.work);
2460 struct datapath *dp;
2464 list_for_each_entry(dp, &ovs_net->dps, list_node)
2465 ovs_flow_masks_rebalance(&dp->table);
2469 schedule_delayed_work(&ovs_net->masks_rebalance,
2470 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2473 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2474 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2475 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2476 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2477 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2478 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2479 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2480 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2481 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2484 static const struct genl_small_ops dp_vport_genl_ops[] = {
2485 { .cmd = OVS_VPORT_CMD_NEW,
2486 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2487 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2488 .doit = ovs_vport_cmd_new
2490 { .cmd = OVS_VPORT_CMD_DEL,
2491 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2492 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2493 .doit = ovs_vport_cmd_del
2495 { .cmd = OVS_VPORT_CMD_GET,
2496 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2497 .flags = 0, /* OK for unprivileged users. */
2498 .doit = ovs_vport_cmd_get,
2499 .dumpit = ovs_vport_cmd_dump
2501 { .cmd = OVS_VPORT_CMD_SET,
2502 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2503 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2504 .doit = ovs_vport_cmd_set,
2508 struct genl_family dp_vport_genl_family __ro_after_init = {
2509 .hdrsize = sizeof(struct ovs_header),
2510 .name = OVS_VPORT_FAMILY,
2511 .version = OVS_VPORT_VERSION,
2512 .maxattr = OVS_VPORT_ATTR_MAX,
2513 .policy = vport_policy,
2515 .parallel_ops = true,
2516 .small_ops = dp_vport_genl_ops,
2517 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops),
2518 .mcgrps = &ovs_dp_vport_multicast_group,
2520 .module = THIS_MODULE,
2523 static struct genl_family * const dp_genl_families[] = {
2524 &dp_datapath_genl_family,
2525 &dp_vport_genl_family,
2526 &dp_flow_genl_family,
2527 &dp_packet_genl_family,
2528 &dp_meter_genl_family,
2529 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2530 &dp_ct_limit_genl_family,
2534 static void dp_unregister_genl(int n_families)
2538 for (i = 0; i < n_families; i++)
2539 genl_unregister_family(dp_genl_families[i]);
2542 static int __init dp_register_genl(void)
2547 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2549 err = genl_register_family(dp_genl_families[i]);
2557 dp_unregister_genl(i);
2561 static int __net_init ovs_init_net(struct net *net)
2563 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2566 INIT_LIST_HEAD(&ovs_net->dps);
2567 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2568 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
2570 err = ovs_ct_init(net);
2574 schedule_delayed_work(&ovs_net->masks_rebalance,
2575 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2579 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2580 struct list_head *head)
2582 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2583 struct datapath *dp;
2585 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2588 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2589 struct vport *vport;
2591 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2592 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2595 if (dev_net(vport->dev) == dnet)
2596 list_add(&vport->detach_list, head);
2602 static void __net_exit ovs_exit_net(struct net *dnet)
2604 struct datapath *dp, *dp_next;
2605 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2606 struct vport *vport, *vport_next;
2614 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2617 down_read(&net_rwsem);
2619 list_vports_from_net(net, dnet, &head);
2620 up_read(&net_rwsem);
2622 /* Detach all vports from given namespace. */
2623 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2624 list_del(&vport->detach_list);
2625 ovs_dp_detach_port(vport);
2630 cancel_delayed_work_sync(&ovs_net->masks_rebalance);
2631 cancel_work_sync(&ovs_net->dp_notify_work);
2634 static struct pernet_operations ovs_net_ops = {
2635 .init = ovs_init_net,
2636 .exit = ovs_exit_net,
2638 .size = sizeof(struct ovs_net),
2641 static int __init dp_init(void)
2645 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) >
2646 sizeof_field(struct sk_buff, cb));
2648 pr_info("Open vSwitch switching datapath\n");
2650 err = action_fifos_init();
2654 err = ovs_internal_dev_rtnl_link_register();
2656 goto error_action_fifos_exit;
2658 err = ovs_flow_init();
2660 goto error_unreg_rtnl_link;
2662 err = ovs_vport_init();
2664 goto error_flow_exit;
2666 err = register_pernet_device(&ovs_net_ops);
2668 goto error_vport_exit;
2670 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2672 goto error_netns_exit;
2674 err = ovs_netdev_init();
2676 goto error_unreg_notifier;
2678 err = dp_register_genl();
2680 goto error_unreg_netdev;
2686 error_unreg_notifier:
2687 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2689 unregister_pernet_device(&ovs_net_ops);
2694 error_unreg_rtnl_link:
2695 ovs_internal_dev_rtnl_link_unregister();
2696 error_action_fifos_exit:
2697 action_fifos_exit();
2702 static void dp_cleanup(void)
2704 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2706 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2707 unregister_pernet_device(&ovs_net_ops);
2711 ovs_internal_dev_rtnl_link_unregister();
2712 action_fifos_exit();
2715 module_init(dp_init);
2716 module_exit(dp_cleanup);
2718 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2719 MODULE_LICENSE("GPL");
2720 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2721 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2722 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2723 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2724 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2725 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);