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);
266 stats_counter = &stats->n_missed;
270 ovs_flow_stats_update(flow, key->tp.flags, skb);
271 sf_acts = rcu_dereference(flow->sf_acts);
272 error = ovs_execute_actions(dp, skb, sf_acts, key);
274 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
275 ovs_dp_name(dp), error);
277 stats_counter = &stats->n_hit;
280 /* Update datapath statistics. */
281 u64_stats_update_begin(&stats->syncp);
283 stats->n_mask_hit += n_mask_hit;
284 stats->n_cache_hit += n_cache_hit;
285 u64_stats_update_end(&stats->syncp);
288 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
289 const struct sw_flow_key *key,
290 const struct dp_upcall_info *upcall_info,
293 struct dp_stats_percpu *stats;
296 if (trace_ovs_dp_upcall_enabled())
297 trace_ovs_dp_upcall(dp, skb, key, upcall_info);
299 if (upcall_info->portid == 0) {
304 if (!skb_is_gso(skb))
305 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
307 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
314 stats = this_cpu_ptr(dp->stats_percpu);
316 u64_stats_update_begin(&stats->syncp);
318 u64_stats_update_end(&stats->syncp);
323 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
324 const struct sw_flow_key *key,
325 const struct dp_upcall_info *upcall_info,
328 unsigned int gso_type = skb_shinfo(skb)->gso_type;
329 struct sw_flow_key later_key;
330 struct sk_buff *segs, *nskb;
333 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET);
334 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
336 return PTR_ERR(segs);
340 if (gso_type & SKB_GSO_UDP) {
341 /* The initial flow key extracted by ovs_flow_key_extract()
342 * in this case is for a first fragment, so we need to
343 * properly mark later fragments.
346 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
349 /* Queue all of the segments. */
350 skb_list_walk_safe(segs, skb, nskb) {
351 if (gso_type & SKB_GSO_UDP && skb != segs)
354 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
360 /* Free all of the segments. */
361 skb_list_walk_safe(segs, skb, nskb) {
370 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
371 unsigned int hdrlen, int actions_attrlen)
373 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
374 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
375 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
376 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
377 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
379 /* OVS_PACKET_ATTR_USERDATA */
380 if (upcall_info->userdata)
381 size += NLA_ALIGN(upcall_info->userdata->nla_len);
383 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
384 if (upcall_info->egress_tun_info)
385 size += nla_total_size(ovs_tun_key_attr_size());
387 /* OVS_PACKET_ATTR_ACTIONS */
388 if (upcall_info->actions_len)
389 size += nla_total_size(actions_attrlen);
391 /* OVS_PACKET_ATTR_MRU */
392 if (upcall_info->mru)
393 size += nla_total_size(sizeof(upcall_info->mru));
398 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
400 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
401 size_t plen = NLA_ALIGN(skb->len) - skb->len;
404 skb_put_zero(skb, plen);
408 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
409 const struct sw_flow_key *key,
410 const struct dp_upcall_info *upcall_info,
413 struct ovs_header *upcall;
414 struct sk_buff *nskb = NULL;
415 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
422 dp_ifindex = get_dpifindex(dp);
426 if (skb_vlan_tag_present(skb)) {
427 nskb = skb_clone(skb, GFP_ATOMIC);
431 nskb = __vlan_hwaccel_push_inside(nskb);
438 if (nla_attr_size(skb->len) > USHRT_MAX) {
443 /* Complete checksum if needed */
444 if (skb->ip_summed == CHECKSUM_PARTIAL &&
445 (err = skb_csum_hwoffload_help(skb, 0)))
448 /* Older versions of OVS user space enforce alignment of the last
449 * Netlink attribute to NLA_ALIGNTO which would require extensive
450 * padding logic. Only perform zerocopy if padding is not required.
452 if (dp->user_features & OVS_DP_F_UNALIGNED)
453 hlen = skb_zerocopy_headlen(skb);
457 len = upcall_msg_size(upcall_info, hlen - cutlen,
458 OVS_CB(skb)->acts_origlen);
459 user_skb = genlmsg_new(len, GFP_ATOMIC);
465 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
466 0, upcall_info->cmd);
471 upcall->dp_ifindex = dp_ifindex;
473 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
477 if (upcall_info->userdata)
478 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
479 nla_len(upcall_info->userdata),
480 nla_data(upcall_info->userdata));
482 if (upcall_info->egress_tun_info) {
483 nla = nla_nest_start_noflag(user_skb,
484 OVS_PACKET_ATTR_EGRESS_TUN_KEY);
489 err = ovs_nla_put_tunnel_info(user_skb,
490 upcall_info->egress_tun_info);
494 nla_nest_end(user_skb, nla);
497 if (upcall_info->actions_len) {
498 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
503 err = ovs_nla_put_actions(upcall_info->actions,
504 upcall_info->actions_len,
507 nla_nest_end(user_skb, nla);
509 nla_nest_cancel(user_skb, nla);
512 /* Add OVS_PACKET_ATTR_MRU */
513 if (upcall_info->mru &&
514 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
519 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
521 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
526 /* Add OVS_PACKET_ATTR_HASH */
527 hash = skb_get_hash_raw(skb);
529 hash |= OVS_PACKET_HASH_SW_BIT;
532 hash |= OVS_PACKET_HASH_L4_BIT;
534 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
539 /* Only reserve room for attribute header, packet data is added
540 * in skb_zerocopy() */
541 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
545 nla->nla_len = nla_attr_size(skb->len - cutlen);
547 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
551 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
552 pad_packet(dp, user_skb);
554 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
556 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
561 consume_skb(user_skb);
567 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
569 struct ovs_header *ovs_header = info->userhdr;
570 struct net *net = sock_net(skb->sk);
571 struct nlattr **a = info->attrs;
572 struct sw_flow_actions *acts;
573 struct sk_buff *packet;
574 struct sw_flow *flow;
575 struct sw_flow_actions *sf_acts;
577 struct vport *input_vport;
582 bool log = !a[OVS_PACKET_ATTR_PROBE];
585 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
586 !a[OVS_PACKET_ATTR_ACTIONS])
589 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
590 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
594 skb_reserve(packet, NET_IP_ALIGN);
596 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
598 /* Set packet's mru */
599 if (a[OVS_PACKET_ATTR_MRU]) {
600 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
601 packet->ignore_df = 1;
603 OVS_CB(packet)->mru = mru;
605 if (a[OVS_PACKET_ATTR_HASH]) {
606 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
608 __skb_set_hash(packet, hash & 0xFFFFFFFFULL,
609 !!(hash & OVS_PACKET_HASH_SW_BIT),
610 !!(hash & OVS_PACKET_HASH_L4_BIT));
613 /* Build an sw_flow for sending this packet. */
614 flow = ovs_flow_alloc();
619 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
620 packet, &flow->key, log);
624 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
625 &flow->key, &acts, log);
629 rcu_assign_pointer(flow->sf_acts, acts);
630 packet->priority = flow->key.phy.priority;
631 packet->mark = flow->key.phy.skb_mark;
634 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
639 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
641 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
646 packet->dev = input_vport->dev;
647 OVS_CB(packet)->input_vport = input_vport;
648 sf_acts = rcu_dereference(flow->sf_acts);
651 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
655 ovs_flow_free(flow, false);
661 ovs_flow_free(flow, false);
668 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
669 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
670 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
671 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
672 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
673 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
674 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
677 static const struct genl_small_ops dp_packet_genl_ops[] = {
678 { .cmd = OVS_PACKET_CMD_EXECUTE,
679 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
680 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
681 .doit = ovs_packet_cmd_execute
685 static struct genl_family dp_packet_genl_family __ro_after_init = {
686 .hdrsize = sizeof(struct ovs_header),
687 .name = OVS_PACKET_FAMILY,
688 .version = OVS_PACKET_VERSION,
689 .maxattr = OVS_PACKET_ATTR_MAX,
690 .policy = packet_policy,
692 .parallel_ops = true,
693 .small_ops = dp_packet_genl_ops,
694 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops),
695 .resv_start_op = OVS_PACKET_CMD_EXECUTE + 1,
696 .module = THIS_MODULE,
699 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
700 struct ovs_dp_megaflow_stats *mega_stats)
704 memset(mega_stats, 0, sizeof(*mega_stats));
706 stats->n_flows = ovs_flow_tbl_count(&dp->table);
707 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
709 stats->n_hit = stats->n_missed = stats->n_lost = 0;
711 for_each_possible_cpu(i) {
712 const struct dp_stats_percpu *percpu_stats;
713 struct dp_stats_percpu local_stats;
716 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
719 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
720 local_stats = *percpu_stats;
721 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
723 stats->n_hit += local_stats.n_hit;
724 stats->n_missed += local_stats.n_missed;
725 stats->n_lost += local_stats.n_lost;
726 mega_stats->n_mask_hit += local_stats.n_mask_hit;
727 mega_stats->n_cache_hit += local_stats.n_cache_hit;
731 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
733 return ovs_identifier_is_ufid(sfid) &&
734 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
737 static bool should_fill_mask(uint32_t ufid_flags)
739 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
742 static bool should_fill_actions(uint32_t ufid_flags)
744 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
747 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
748 const struct sw_flow_id *sfid,
751 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
753 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
754 * see ovs_nla_put_identifier()
756 if (sfid && ovs_identifier_is_ufid(sfid))
757 len += nla_total_size(sfid->ufid_len);
759 len += nla_total_size(ovs_key_attr_size());
761 /* OVS_FLOW_ATTR_KEY */
762 if (!sfid || should_fill_key(sfid, ufid_flags))
763 len += nla_total_size(ovs_key_attr_size());
765 /* OVS_FLOW_ATTR_MASK */
766 if (should_fill_mask(ufid_flags))
767 len += nla_total_size(ovs_key_attr_size());
769 /* OVS_FLOW_ATTR_ACTIONS */
770 if (should_fill_actions(ufid_flags))
771 len += nla_total_size(acts->orig_len);
774 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
775 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
776 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
779 /* Called with ovs_mutex or RCU read lock. */
780 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
783 struct ovs_flow_stats stats;
787 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
790 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
794 if (stats.n_packets &&
795 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
796 sizeof(struct ovs_flow_stats), &stats,
800 if ((u8)ntohs(tcp_flags) &&
801 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
807 /* Called with ovs_mutex or RCU read lock. */
808 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
809 struct sk_buff *skb, int skb_orig_len)
811 struct nlattr *start;
814 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
815 * this is the first flow to be dumped into 'skb'. This is unusual for
816 * Netlink but individual action lists can be longer than
817 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
818 * The userspace caller can always fetch the actions separately if it
819 * really wants them. (Most userspace callers in fact don't care.)
821 * This can only fail for dump operations because the skb is always
822 * properly sized for single flows.
824 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
826 const struct sw_flow_actions *sf_acts;
828 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
829 err = ovs_nla_put_actions(sf_acts->actions,
830 sf_acts->actions_len, skb);
833 nla_nest_end(skb, start);
838 nla_nest_cancel(skb, start);
840 } else if (skb_orig_len) {
847 /* Called with ovs_mutex or RCU read lock. */
848 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
849 struct sk_buff *skb, u32 portid,
850 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
852 const int skb_orig_len = skb->len;
853 struct ovs_header *ovs_header;
856 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
861 ovs_header->dp_ifindex = dp_ifindex;
863 err = ovs_nla_put_identifier(flow, skb);
867 if (should_fill_key(&flow->id, ufid_flags)) {
868 err = ovs_nla_put_masked_key(flow, skb);
873 if (should_fill_mask(ufid_flags)) {
874 err = ovs_nla_put_mask(flow, skb);
879 err = ovs_flow_cmd_fill_stats(flow, skb);
883 if (should_fill_actions(ufid_flags)) {
884 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
889 genlmsg_end(skb, ovs_header);
893 genlmsg_cancel(skb, ovs_header);
897 /* May not be called with RCU read lock. */
898 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
899 const struct sw_flow_id *sfid,
900 struct genl_info *info,
907 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
910 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
911 skb = genlmsg_new(len, GFP_KERNEL);
913 return ERR_PTR(-ENOMEM);
918 /* Called with ovs_mutex. */
919 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
921 struct genl_info *info, u8 cmd,
922 bool always, u32 ufid_flags)
927 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
928 &flow->id, info, always, ufid_flags);
929 if (IS_ERR_OR_NULL(skb))
932 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
933 info->snd_portid, info->snd_seq, 0,
935 if (WARN_ON_ONCE(retval < 0)) {
937 skb = ERR_PTR(retval);
942 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
944 struct net *net = sock_net(skb->sk);
945 struct nlattr **a = info->attrs;
946 struct ovs_header *ovs_header = info->userhdr;
947 struct sw_flow *flow = NULL, *new_flow;
948 struct sw_flow_mask mask;
949 struct sk_buff *reply;
951 struct sw_flow_key *key;
952 struct sw_flow_actions *acts;
953 struct sw_flow_match match;
954 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
956 bool log = !a[OVS_FLOW_ATTR_PROBE];
958 /* Must have key and actions. */
960 if (!a[OVS_FLOW_ATTR_KEY]) {
961 OVS_NLERR(log, "Flow key attr not present in new flow.");
964 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
965 OVS_NLERR(log, "Flow actions attr not present in new flow.");
969 /* Most of the time we need to allocate a new flow, do it before
972 new_flow = ovs_flow_alloc();
973 if (IS_ERR(new_flow)) {
974 error = PTR_ERR(new_flow);
979 key = kzalloc(sizeof(*key), GFP_KERNEL);
985 ovs_match_init(&match, key, false, &mask);
986 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
987 a[OVS_FLOW_ATTR_MASK], log);
991 ovs_flow_mask_key(&new_flow->key, key, true, &mask);
993 /* Extract flow identifier. */
994 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
999 /* Validate actions. */
1000 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
1001 &new_flow->key, &acts, log);
1003 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
1007 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
1009 if (IS_ERR(reply)) {
1010 error = PTR_ERR(reply);
1011 goto err_kfree_acts;
1015 dp = get_dp(net, ovs_header->dp_ifindex);
1016 if (unlikely(!dp)) {
1018 goto err_unlock_ovs;
1021 /* Check if this is a duplicate flow */
1022 if (ovs_identifier_is_ufid(&new_flow->id))
1023 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
1025 flow = ovs_flow_tbl_lookup(&dp->table, key);
1026 if (likely(!flow)) {
1027 rcu_assign_pointer(new_flow->sf_acts, acts);
1029 /* Put flow in bucket. */
1030 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1031 if (unlikely(error)) {
1033 goto err_unlock_ovs;
1036 if (unlikely(reply)) {
1037 error = ovs_flow_cmd_fill_info(new_flow,
1038 ovs_header->dp_ifindex,
1039 reply, info->snd_portid,
1047 struct sw_flow_actions *old_acts;
1049 /* Bail out if we're not allowed to modify an existing flow.
1050 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1051 * because Generic Netlink treats the latter as a dump
1052 * request. We also accept NLM_F_EXCL in case that bug ever
1055 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1058 goto err_unlock_ovs;
1060 /* The flow identifier has to be the same for flow updates.
1061 * Look for any overlapping flow.
1063 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1064 if (ovs_identifier_is_key(&flow->id))
1065 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1067 else /* UFID matches but key is different */
1071 goto err_unlock_ovs;
1074 /* Update actions. */
1075 old_acts = ovsl_dereference(flow->sf_acts);
1076 rcu_assign_pointer(flow->sf_acts, acts);
1078 if (unlikely(reply)) {
1079 error = ovs_flow_cmd_fill_info(flow,
1080 ovs_header->dp_ifindex,
1081 reply, info->snd_portid,
1089 ovs_nla_free_flow_actions_rcu(old_acts);
1090 ovs_flow_free(new_flow, false);
1094 ovs_notify(&dp_flow_genl_family, reply, info);
1103 ovs_nla_free_flow_actions(acts);
1107 ovs_flow_free(new_flow, false);
1112 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1113 static noinline_for_stack
1114 struct sw_flow_actions *get_flow_actions(struct net *net,
1115 const struct nlattr *a,
1116 const struct sw_flow_key *key,
1117 const struct sw_flow_mask *mask,
1120 struct sw_flow_actions *acts;
1121 struct sw_flow_key masked_key;
1124 ovs_flow_mask_key(&masked_key, key, true, mask);
1125 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1128 "Actions may not be safe on all matching packets");
1129 return ERR_PTR(error);
1135 /* Factor out match-init and action-copy to avoid
1136 * "Wframe-larger-than=1024" warning. Because mask is only
1137 * used to get actions, we new a function to save some
1140 * If there are not key and action attrs, we return 0
1141 * directly. In the case, the caller will also not use the
1142 * match as before. If there is action attr, we try to get
1143 * actions and save them to *acts. Before returning from
1144 * the function, we reset the match->mask pointer. Because
1145 * we should not to return match object with dangling reference
1148 static noinline_for_stack int
1149 ovs_nla_init_match_and_action(struct net *net,
1150 struct sw_flow_match *match,
1151 struct sw_flow_key *key,
1153 struct sw_flow_actions **acts,
1156 struct sw_flow_mask mask;
1159 if (a[OVS_FLOW_ATTR_KEY]) {
1160 ovs_match_init(match, key, true, &mask);
1161 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1162 a[OVS_FLOW_ATTR_MASK], log);
1167 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1168 if (!a[OVS_FLOW_ATTR_KEY]) {
1170 "Flow key attribute not present in set flow.");
1175 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1177 if (IS_ERR(*acts)) {
1178 error = PTR_ERR(*acts);
1183 /* On success, error is 0. */
1189 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1191 struct net *net = sock_net(skb->sk);
1192 struct nlattr **a = info->attrs;
1193 struct ovs_header *ovs_header = info->userhdr;
1194 struct sw_flow_key key;
1195 struct sw_flow *flow;
1196 struct sk_buff *reply = NULL;
1197 struct datapath *dp;
1198 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1199 struct sw_flow_match match;
1200 struct sw_flow_id sfid;
1201 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1203 bool log = !a[OVS_FLOW_ATTR_PROBE];
1206 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1207 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1209 "Flow set message rejected, Key attribute missing.");
1213 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1219 /* Can allocate before locking if have acts. */
1220 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1222 if (IS_ERR(reply)) {
1223 error = PTR_ERR(reply);
1224 goto err_kfree_acts;
1229 dp = get_dp(net, ovs_header->dp_ifindex);
1230 if (unlikely(!dp)) {
1232 goto err_unlock_ovs;
1234 /* Check that the flow exists. */
1236 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1238 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1239 if (unlikely(!flow)) {
1241 goto err_unlock_ovs;
1244 /* Update actions, if present. */
1246 old_acts = ovsl_dereference(flow->sf_acts);
1247 rcu_assign_pointer(flow->sf_acts, acts);
1249 if (unlikely(reply)) {
1250 error = ovs_flow_cmd_fill_info(flow,
1251 ovs_header->dp_ifindex,
1252 reply, info->snd_portid,
1259 /* Could not alloc without acts before locking. */
1260 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1261 info, OVS_FLOW_CMD_SET, false,
1264 if (IS_ERR(reply)) {
1265 error = PTR_ERR(reply);
1266 goto err_unlock_ovs;
1271 if (a[OVS_FLOW_ATTR_CLEAR])
1272 ovs_flow_stats_clear(flow);
1276 ovs_notify(&dp_flow_genl_family, reply, info);
1278 ovs_nla_free_flow_actions_rcu(old_acts);
1286 ovs_nla_free_flow_actions(acts);
1291 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1293 struct nlattr **a = info->attrs;
1294 struct ovs_header *ovs_header = info->userhdr;
1295 struct net *net = sock_net(skb->sk);
1296 struct sw_flow_key key;
1297 struct sk_buff *reply;
1298 struct sw_flow *flow;
1299 struct datapath *dp;
1300 struct sw_flow_match match;
1301 struct sw_flow_id ufid;
1302 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1304 bool log = !a[OVS_FLOW_ATTR_PROBE];
1307 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1308 if (a[OVS_FLOW_ATTR_KEY]) {
1309 ovs_match_init(&match, &key, true, NULL);
1310 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1312 } else if (!ufid_present) {
1314 "Flow get message rejected, Key attribute missing.");
1321 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1328 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1330 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1336 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1337 OVS_FLOW_CMD_GET, true, ufid_flags);
1338 if (IS_ERR(reply)) {
1339 err = PTR_ERR(reply);
1344 return genlmsg_reply(reply, info);
1350 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1352 struct nlattr **a = info->attrs;
1353 struct ovs_header *ovs_header = info->userhdr;
1354 struct net *net = sock_net(skb->sk);
1355 struct sw_flow_key key;
1356 struct sk_buff *reply;
1357 struct sw_flow *flow = NULL;
1358 struct datapath *dp;
1359 struct sw_flow_match match;
1360 struct sw_flow_id ufid;
1361 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1363 bool log = !a[OVS_FLOW_ATTR_PROBE];
1366 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1367 if (a[OVS_FLOW_ATTR_KEY]) {
1368 ovs_match_init(&match, &key, true, NULL);
1369 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1376 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1377 if (unlikely(!dp)) {
1382 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1383 err = ovs_flow_tbl_flush(&dp->table);
1388 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1390 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1391 if (unlikely(!flow)) {
1396 ovs_flow_tbl_remove(&dp->table, flow);
1399 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1400 &flow->id, info, false, ufid_flags);
1401 if (likely(reply)) {
1402 if (!IS_ERR(reply)) {
1403 rcu_read_lock(); /*To keep RCU checker happy. */
1404 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1405 reply, info->snd_portid,
1410 if (WARN_ON_ONCE(err < 0)) {
1415 ovs_notify(&dp_flow_genl_family, reply, info);
1417 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0,
1423 ovs_flow_free(flow, true);
1430 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1432 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1433 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1434 struct table_instance *ti;
1435 struct datapath *dp;
1439 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1440 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1443 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1446 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1452 ti = rcu_dereference(dp->table.ti);
1454 struct sw_flow *flow;
1457 bucket = cb->args[0];
1459 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1463 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1464 NETLINK_CB(cb->skb).portid,
1465 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1466 OVS_FLOW_CMD_GET, ufid_flags) < 0)
1469 cb->args[0] = bucket;
1476 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1477 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1478 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1479 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1480 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1481 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1482 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1483 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1486 static const struct genl_small_ops dp_flow_genl_ops[] = {
1487 { .cmd = OVS_FLOW_CMD_NEW,
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_new
1492 { .cmd = OVS_FLOW_CMD_DEL,
1493 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1494 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1495 .doit = ovs_flow_cmd_del
1497 { .cmd = OVS_FLOW_CMD_GET,
1498 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1499 .flags = 0, /* OK for unprivileged users. */
1500 .doit = ovs_flow_cmd_get,
1501 .dumpit = ovs_flow_cmd_dump
1503 { .cmd = OVS_FLOW_CMD_SET,
1504 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1505 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1506 .doit = ovs_flow_cmd_set,
1510 static struct genl_family dp_flow_genl_family __ro_after_init = {
1511 .hdrsize = sizeof(struct ovs_header),
1512 .name = OVS_FLOW_FAMILY,
1513 .version = OVS_FLOW_VERSION,
1514 .maxattr = OVS_FLOW_ATTR_MAX,
1515 .policy = flow_policy,
1517 .parallel_ops = true,
1518 .small_ops = dp_flow_genl_ops,
1519 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops),
1520 .resv_start_op = OVS_FLOW_CMD_SET + 1,
1521 .mcgrps = &ovs_dp_flow_multicast_group,
1523 .module = THIS_MODULE,
1526 static size_t ovs_dp_cmd_msg_size(void)
1528 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1530 msgsize += nla_total_size(IFNAMSIZ);
1531 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1532 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1533 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1534 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
1535 msgsize += nla_total_size(sizeof(u32) * nr_cpu_ids); /* OVS_DP_ATTR_PER_CPU_PIDS */
1540 /* Called with ovs_mutex. */
1541 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1542 u32 portid, u32 seq, u32 flags, u8 cmd)
1544 struct ovs_header *ovs_header;
1545 struct ovs_dp_stats dp_stats;
1546 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1547 struct dp_nlsk_pids *pids = ovsl_dereference(dp->upcall_portids);
1550 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1555 ovs_header->dp_ifindex = get_dpifindex(dp);
1557 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1559 goto nla_put_failure;
1561 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1562 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1563 &dp_stats, OVS_DP_ATTR_PAD))
1564 goto nla_put_failure;
1566 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1567 sizeof(struct ovs_dp_megaflow_stats),
1568 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1569 goto nla_put_failure;
1571 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1572 goto nla_put_failure;
1574 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE,
1575 ovs_flow_tbl_masks_cache_size(&dp->table)))
1576 goto nla_put_failure;
1578 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && pids) {
1579 pids_len = min(pids->n_pids, nr_cpu_ids) * sizeof(u32);
1580 if (nla_put(skb, OVS_DP_ATTR_PER_CPU_PIDS, pids_len, &pids->pids))
1581 goto nla_put_failure;
1584 genlmsg_end(skb, ovs_header);
1588 genlmsg_cancel(skb, ovs_header);
1593 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1595 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1598 /* Called with rcu_read_lock or ovs_mutex. */
1599 static struct datapath *lookup_datapath(struct net *net,
1600 const struct ovs_header *ovs_header,
1601 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1603 struct datapath *dp;
1605 if (!a[OVS_DP_ATTR_NAME])
1606 dp = get_dp(net, ovs_header->dp_ifindex);
1608 struct vport *vport;
1610 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1611 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1613 return dp ? dp : ERR_PTR(-ENODEV);
1616 static void ovs_dp_reset_user_features(struct sk_buff *skb,
1617 struct genl_info *info)
1619 struct datapath *dp;
1621 dp = lookup_datapath(sock_net(skb->sk), info->userhdr,
1626 pr_warn("%s: Dropping previously announced user features\n",
1628 dp->user_features = 0;
1631 static int ovs_dp_set_upcall_portids(struct datapath *dp,
1632 const struct nlattr *ids)
1634 struct dp_nlsk_pids *old, *dp_nlsk_pids;
1636 if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
1639 old = ovsl_dereference(dp->upcall_portids);
1641 dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids),
1646 dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32);
1647 nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids));
1649 rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids);
1651 kfree_rcu(old, rcu);
1656 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id)
1658 struct dp_nlsk_pids *dp_nlsk_pids;
1660 dp_nlsk_pids = rcu_dereference(dp->upcall_portids);
1663 if (cpu_id < dp_nlsk_pids->n_pids) {
1664 return dp_nlsk_pids->pids[cpu_id];
1665 } else if (dp_nlsk_pids->n_pids > 0 &&
1666 cpu_id >= dp_nlsk_pids->n_pids) {
1667 /* If the number of netlink PIDs is mismatched with
1668 * the number of CPUs as seen by the kernel, log this
1669 * and send the upcall to an arbitrary socket (0) in
1670 * order to not drop packets
1672 pr_info_ratelimited("cpu_id mismatch with handler threads");
1673 return dp_nlsk_pids->pids[cpu_id %
1674 dp_nlsk_pids->n_pids];
1683 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1685 u32 user_features = 0, old_features = dp->user_features;
1688 if (a[OVS_DP_ATTR_USER_FEATURES]) {
1689 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1691 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1692 OVS_DP_F_UNALIGNED |
1693 OVS_DP_F_TC_RECIRC_SHARING |
1694 OVS_DP_F_DISPATCH_UPCALL_PER_CPU))
1697 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1698 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1703 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
1707 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
1708 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size);
1713 dp->user_features = user_features;
1715 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU &&
1716 a[OVS_DP_ATTR_PER_CPU_PIDS]) {
1717 /* Upcall Netlink Port IDs have been updated */
1718 err = ovs_dp_set_upcall_portids(dp,
1719 a[OVS_DP_ATTR_PER_CPU_PIDS]);
1724 if ((dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1725 !(old_features & OVS_DP_F_TC_RECIRC_SHARING))
1726 tc_skb_ext_tc_enable();
1727 else if (!(dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1728 (old_features & OVS_DP_F_TC_RECIRC_SHARING))
1729 tc_skb_ext_tc_disable();
1734 static int ovs_dp_stats_init(struct datapath *dp)
1736 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1737 if (!dp->stats_percpu)
1743 static int ovs_dp_vport_init(struct datapath *dp)
1747 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1748 sizeof(struct hlist_head),
1753 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1754 INIT_HLIST_HEAD(&dp->ports[i]);
1759 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1761 struct nlattr **a = info->attrs;
1762 struct vport_parms parms;
1763 struct sk_buff *reply;
1764 struct datapath *dp;
1765 struct vport *vport;
1766 struct ovs_net *ovs_net;
1770 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1773 reply = ovs_dp_cmd_alloc_info();
1778 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1780 goto err_destroy_reply;
1782 ovs_dp_set_net(dp, sock_net(skb->sk));
1784 /* Allocate table. */
1785 err = ovs_flow_tbl_init(&dp->table);
1787 goto err_destroy_dp;
1789 err = ovs_dp_stats_init(dp);
1791 goto err_destroy_table;
1793 err = ovs_dp_vport_init(dp);
1795 goto err_destroy_stats;
1797 err = ovs_meters_init(dp);
1799 goto err_destroy_ports;
1801 /* Set up our datapath device. */
1802 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1803 parms.type = OVS_VPORT_TYPE_INTERNAL;
1804 parms.options = NULL;
1806 parms.port_no = OVSP_LOCAL;
1807 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1808 parms.desired_ifindex = a[OVS_DP_ATTR_IFINDEX]
1809 ? nla_get_u32(a[OVS_DP_ATTR_IFINDEX]) : 0;
1811 /* So far only local changes have been made, now need the lock. */
1814 err = ovs_dp_change(dp, a);
1816 goto err_unlock_and_destroy_meters;
1818 vport = new_vport(&parms);
1819 if (IS_ERR(vport)) {
1820 err = PTR_ERR(vport);
1824 if (err == -EEXIST) {
1825 /* An outdated user space instance that does not understand
1826 * the concept of user_features has attempted to create a new
1827 * datapath and is likely to reuse it. Drop all user features.
1829 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1830 ovs_dp_reset_user_features(skb, info);
1833 goto err_destroy_portids;
1836 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1837 info->snd_seq, 0, OVS_DP_CMD_NEW);
1840 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1841 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1845 ovs_notify(&dp_datapath_genl_family, reply, info);
1848 err_destroy_portids:
1849 kfree(rcu_dereference_raw(dp->upcall_portids));
1850 err_unlock_and_destroy_meters:
1852 ovs_meters_exit(dp);
1856 free_percpu(dp->stats_percpu);
1858 ovs_flow_tbl_destroy(&dp->table);
1867 /* Called with ovs_mutex. */
1868 static void __dp_destroy(struct datapath *dp)
1870 struct flow_table *table = &dp->table;
1873 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1874 tc_skb_ext_tc_disable();
1876 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1877 struct vport *vport;
1878 struct hlist_node *n;
1880 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1881 if (vport->port_no != OVSP_LOCAL)
1882 ovs_dp_detach_port(vport);
1885 list_del_rcu(&dp->list_node);
1887 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1888 * all ports in datapath are destroyed first before freeing datapath.
1890 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1892 /* Flush sw_flow in the tables. RCU cb only releases resource
1893 * such as dp, ports and tables. That may avoid some issues
1894 * such as RCU usage warning.
1896 table_instance_flow_flush(table, ovsl_dereference(table->ti),
1897 ovsl_dereference(table->ufid_ti));
1899 /* RCU destroy the ports, meters and flow tables. */
1900 call_rcu(&dp->rcu, destroy_dp_rcu);
1903 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1905 struct sk_buff *reply;
1906 struct datapath *dp;
1909 reply = ovs_dp_cmd_alloc_info();
1914 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1917 goto err_unlock_free;
1919 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1920 info->snd_seq, 0, OVS_DP_CMD_DEL);
1926 ovs_notify(&dp_datapath_genl_family, reply, info);
1936 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1938 struct sk_buff *reply;
1939 struct datapath *dp;
1942 reply = ovs_dp_cmd_alloc_info();
1947 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1950 goto err_unlock_free;
1952 err = ovs_dp_change(dp, info->attrs);
1954 goto err_unlock_free;
1956 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1957 info->snd_seq, 0, OVS_DP_CMD_SET);
1961 ovs_notify(&dp_datapath_genl_family, reply, info);
1971 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1973 struct sk_buff *reply;
1974 struct datapath *dp;
1977 reply = ovs_dp_cmd_alloc_info();
1982 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1985 goto err_unlock_free;
1987 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1988 info->snd_seq, 0, OVS_DP_CMD_GET);
1992 return genlmsg_reply(reply, info);
2000 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2002 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
2003 struct datapath *dp;
2004 int skip = cb->args[0];
2008 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2010 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
2011 cb->nlh->nlmsg_seq, NLM_F_MULTI,
2012 OVS_DP_CMD_GET) < 0)
2023 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
2024 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2025 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2026 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
2027 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0,
2028 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
2029 [OVS_DP_ATTR_IFINDEX] = {.type = NLA_U32 },
2032 static const struct genl_small_ops dp_datapath_genl_ops[] = {
2033 { .cmd = OVS_DP_CMD_NEW,
2034 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2035 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2036 .doit = ovs_dp_cmd_new
2038 { .cmd = OVS_DP_CMD_DEL,
2039 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2040 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2041 .doit = ovs_dp_cmd_del
2043 { .cmd = OVS_DP_CMD_GET,
2044 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2045 .flags = 0, /* OK for unprivileged users. */
2046 .doit = ovs_dp_cmd_get,
2047 .dumpit = ovs_dp_cmd_dump
2049 { .cmd = OVS_DP_CMD_SET,
2050 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2051 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2052 .doit = ovs_dp_cmd_set,
2056 static struct genl_family dp_datapath_genl_family __ro_after_init = {
2057 .hdrsize = sizeof(struct ovs_header),
2058 .name = OVS_DATAPATH_FAMILY,
2059 .version = OVS_DATAPATH_VERSION,
2060 .maxattr = OVS_DP_ATTR_MAX,
2061 .policy = datapath_policy,
2063 .parallel_ops = true,
2064 .small_ops = dp_datapath_genl_ops,
2065 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops),
2066 .resv_start_op = OVS_DP_CMD_SET + 1,
2067 .mcgrps = &ovs_dp_datapath_multicast_group,
2069 .module = THIS_MODULE,
2072 /* Called with ovs_mutex or RCU read lock. */
2073 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
2074 struct net *net, u32 portid, u32 seq,
2075 u32 flags, u8 cmd, gfp_t gfp)
2077 struct ovs_header *ovs_header;
2078 struct ovs_vport_stats vport_stats;
2081 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
2086 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
2088 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
2089 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
2090 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
2091 ovs_vport_name(vport)) ||
2092 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
2093 goto nla_put_failure;
2095 if (!net_eq(net, dev_net(vport->dev))) {
2096 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
2098 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
2099 goto nla_put_failure;
2102 ovs_vport_get_stats(vport, &vport_stats);
2103 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
2104 sizeof(struct ovs_vport_stats), &vport_stats,
2105 OVS_VPORT_ATTR_PAD))
2106 goto nla_put_failure;
2108 if (ovs_vport_get_upcall_portids(vport, skb))
2109 goto nla_put_failure;
2111 err = ovs_vport_get_options(vport, skb);
2112 if (err == -EMSGSIZE)
2115 genlmsg_end(skb, ovs_header);
2121 genlmsg_cancel(skb, ovs_header);
2125 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
2127 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2130 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
2131 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
2132 u32 portid, u32 seq, u8 cmd)
2134 struct sk_buff *skb;
2137 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2139 return ERR_PTR(-ENOMEM);
2141 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
2148 /* Called with ovs_mutex or RCU read lock. */
2149 static struct vport *lookup_vport(struct net *net,
2150 const struct ovs_header *ovs_header,
2151 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2153 struct datapath *dp;
2154 struct vport *vport;
2156 if (a[OVS_VPORT_ATTR_IFINDEX])
2157 return ERR_PTR(-EOPNOTSUPP);
2158 if (a[OVS_VPORT_ATTR_NAME]) {
2159 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2161 return ERR_PTR(-ENODEV);
2162 if (ovs_header->dp_ifindex &&
2163 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2164 return ERR_PTR(-ENODEV);
2166 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2167 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2169 if (port_no >= DP_MAX_PORTS)
2170 return ERR_PTR(-EFBIG);
2172 dp = get_dp(net, ovs_header->dp_ifindex);
2174 return ERR_PTR(-ENODEV);
2176 vport = ovs_vport_ovsl_rcu(dp, port_no);
2178 return ERR_PTR(-ENODEV);
2181 return ERR_PTR(-EINVAL);
2185 static unsigned int ovs_get_max_headroom(struct datapath *dp)
2187 unsigned int dev_headroom, max_headroom = 0;
2188 struct net_device *dev;
2189 struct vport *vport;
2192 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2193 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2194 lockdep_ovsl_is_held()) {
2196 dev_headroom = netdev_get_fwd_headroom(dev);
2197 if (dev_headroom > max_headroom)
2198 max_headroom = dev_headroom;
2202 return max_headroom;
2205 /* Called with ovs_mutex */
2206 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2208 struct vport *vport;
2211 dp->max_headroom = new_headroom;
2212 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2213 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2214 lockdep_ovsl_is_held())
2215 netdev_set_rx_headroom(vport->dev, new_headroom);
2219 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2221 struct nlattr **a = info->attrs;
2222 struct ovs_header *ovs_header = info->userhdr;
2223 struct vport_parms parms;
2224 struct sk_buff *reply;
2225 struct vport *vport;
2226 struct datapath *dp;
2227 unsigned int new_headroom;
2231 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2232 !a[OVS_VPORT_ATTR_UPCALL_PID])
2235 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2237 if (a[OVS_VPORT_ATTR_IFINDEX] && parms.type != OVS_VPORT_TYPE_INTERNAL)
2240 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2241 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2242 if (port_no >= DP_MAX_PORTS)
2245 reply = ovs_vport_cmd_alloc_info();
2251 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2254 goto exit_unlock_free;
2257 vport = ovs_vport_ovsl(dp, port_no);
2260 goto exit_unlock_free;
2262 for (port_no = 1; ; port_no++) {
2263 if (port_no >= DP_MAX_PORTS) {
2265 goto exit_unlock_free;
2267 vport = ovs_vport_ovsl(dp, port_no);
2273 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2274 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2276 parms.port_no = port_no;
2277 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2278 parms.desired_ifindex = a[OVS_VPORT_ATTR_IFINDEX]
2279 ? nla_get_u32(a[OVS_VPORT_ATTR_IFINDEX]) : 0;
2281 vport = new_vport(&parms);
2282 err = PTR_ERR(vport);
2283 if (IS_ERR(vport)) {
2286 goto exit_unlock_free;
2289 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2290 info->snd_portid, info->snd_seq, 0,
2291 OVS_VPORT_CMD_NEW, GFP_KERNEL);
2293 new_headroom = netdev_get_fwd_headroom(vport->dev);
2295 if (new_headroom > dp->max_headroom)
2296 ovs_update_headroom(dp, new_headroom);
2298 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2303 ovs_notify(&dp_vport_genl_family, reply, info);
2312 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2314 struct nlattr **a = info->attrs;
2315 struct sk_buff *reply;
2316 struct vport *vport;
2319 reply = ovs_vport_cmd_alloc_info();
2324 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2325 err = PTR_ERR(vport);
2327 goto exit_unlock_free;
2329 if (a[OVS_VPORT_ATTR_TYPE] &&
2330 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2332 goto exit_unlock_free;
2335 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2336 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2338 goto exit_unlock_free;
2342 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2343 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2345 err = ovs_vport_set_upcall_portids(vport, ids);
2347 goto exit_unlock_free;
2350 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2351 info->snd_portid, info->snd_seq, 0,
2352 OVS_VPORT_CMD_SET, GFP_KERNEL);
2356 ovs_notify(&dp_vport_genl_family, reply, info);
2365 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2367 bool update_headroom = false;
2368 struct nlattr **a = info->attrs;
2369 struct sk_buff *reply;
2370 struct datapath *dp;
2371 struct vport *vport;
2372 unsigned int new_headroom;
2375 reply = ovs_vport_cmd_alloc_info();
2380 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2381 err = PTR_ERR(vport);
2383 goto exit_unlock_free;
2385 if (vport->port_no == OVSP_LOCAL) {
2387 goto exit_unlock_free;
2390 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2391 info->snd_portid, info->snd_seq, 0,
2392 OVS_VPORT_CMD_DEL, GFP_KERNEL);
2395 /* the vport deletion may trigger dp headroom update */
2397 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2398 update_headroom = true;
2400 netdev_reset_rx_headroom(vport->dev);
2401 ovs_dp_detach_port(vport);
2403 if (update_headroom) {
2404 new_headroom = ovs_get_max_headroom(dp);
2406 if (new_headroom < dp->max_headroom)
2407 ovs_update_headroom(dp, new_headroom);
2411 ovs_notify(&dp_vport_genl_family, reply, info);
2420 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2422 struct nlattr **a = info->attrs;
2423 struct ovs_header *ovs_header = info->userhdr;
2424 struct sk_buff *reply;
2425 struct vport *vport;
2428 reply = ovs_vport_cmd_alloc_info();
2433 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2434 err = PTR_ERR(vport);
2436 goto exit_unlock_free;
2437 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2438 info->snd_portid, info->snd_seq, 0,
2439 OVS_VPORT_CMD_GET, GFP_ATOMIC);
2443 return genlmsg_reply(reply, info);
2451 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2453 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2454 struct datapath *dp;
2455 int bucket = cb->args[0], skip = cb->args[1];
2459 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2464 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2465 struct vport *vport;
2468 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2470 ovs_vport_cmd_fill_info(vport, skb,
2472 NETLINK_CB(cb->skb).portid,
2492 static void ovs_dp_masks_rebalance(struct work_struct *work)
2494 struct ovs_net *ovs_net = container_of(work, struct ovs_net,
2495 masks_rebalance.work);
2496 struct datapath *dp;
2500 list_for_each_entry(dp, &ovs_net->dps, list_node)
2501 ovs_flow_masks_rebalance(&dp->table);
2505 schedule_delayed_work(&ovs_net->masks_rebalance,
2506 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2509 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2510 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2511 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2512 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2513 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2514 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2515 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2516 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2517 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2520 static const struct genl_small_ops dp_vport_genl_ops[] = {
2521 { .cmd = OVS_VPORT_CMD_NEW,
2522 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2523 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2524 .doit = ovs_vport_cmd_new
2526 { .cmd = OVS_VPORT_CMD_DEL,
2527 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2528 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2529 .doit = ovs_vport_cmd_del
2531 { .cmd = OVS_VPORT_CMD_GET,
2532 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2533 .flags = 0, /* OK for unprivileged users. */
2534 .doit = ovs_vport_cmd_get,
2535 .dumpit = ovs_vport_cmd_dump
2537 { .cmd = OVS_VPORT_CMD_SET,
2538 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2539 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2540 .doit = ovs_vport_cmd_set,
2544 struct genl_family dp_vport_genl_family __ro_after_init = {
2545 .hdrsize = sizeof(struct ovs_header),
2546 .name = OVS_VPORT_FAMILY,
2547 .version = OVS_VPORT_VERSION,
2548 .maxattr = OVS_VPORT_ATTR_MAX,
2549 .policy = vport_policy,
2551 .parallel_ops = true,
2552 .small_ops = dp_vport_genl_ops,
2553 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops),
2554 .resv_start_op = OVS_VPORT_CMD_SET + 1,
2555 .mcgrps = &ovs_dp_vport_multicast_group,
2557 .module = THIS_MODULE,
2560 static struct genl_family * const dp_genl_families[] = {
2561 &dp_datapath_genl_family,
2562 &dp_vport_genl_family,
2563 &dp_flow_genl_family,
2564 &dp_packet_genl_family,
2565 &dp_meter_genl_family,
2566 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2567 &dp_ct_limit_genl_family,
2571 static void dp_unregister_genl(int n_families)
2575 for (i = 0; i < n_families; i++)
2576 genl_unregister_family(dp_genl_families[i]);
2579 static int __init dp_register_genl(void)
2584 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2586 err = genl_register_family(dp_genl_families[i]);
2594 dp_unregister_genl(i);
2598 static int __net_init ovs_init_net(struct net *net)
2600 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2603 INIT_LIST_HEAD(&ovs_net->dps);
2604 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2605 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
2607 err = ovs_ct_init(net);
2611 schedule_delayed_work(&ovs_net->masks_rebalance,
2612 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2616 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2617 struct list_head *head)
2619 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2620 struct datapath *dp;
2622 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2625 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2626 struct vport *vport;
2628 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2629 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2632 if (dev_net(vport->dev) == dnet)
2633 list_add(&vport->detach_list, head);
2639 static void __net_exit ovs_exit_net(struct net *dnet)
2641 struct datapath *dp, *dp_next;
2642 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2643 struct vport *vport, *vport_next;
2651 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2654 down_read(&net_rwsem);
2656 list_vports_from_net(net, dnet, &head);
2657 up_read(&net_rwsem);
2659 /* Detach all vports from given namespace. */
2660 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2661 list_del(&vport->detach_list);
2662 ovs_dp_detach_port(vport);
2667 cancel_delayed_work_sync(&ovs_net->masks_rebalance);
2668 cancel_work_sync(&ovs_net->dp_notify_work);
2671 static struct pernet_operations ovs_net_ops = {
2672 .init = ovs_init_net,
2673 .exit = ovs_exit_net,
2675 .size = sizeof(struct ovs_net),
2678 static int __init dp_init(void)
2682 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) >
2683 sizeof_field(struct sk_buff, cb));
2685 pr_info("Open vSwitch switching datapath\n");
2687 err = action_fifos_init();
2691 err = ovs_internal_dev_rtnl_link_register();
2693 goto error_action_fifos_exit;
2695 err = ovs_flow_init();
2697 goto error_unreg_rtnl_link;
2699 err = ovs_vport_init();
2701 goto error_flow_exit;
2703 err = register_pernet_device(&ovs_net_ops);
2705 goto error_vport_exit;
2707 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2709 goto error_netns_exit;
2711 err = ovs_netdev_init();
2713 goto error_unreg_notifier;
2715 err = dp_register_genl();
2717 goto error_unreg_netdev;
2723 error_unreg_notifier:
2724 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2726 unregister_pernet_device(&ovs_net_ops);
2731 error_unreg_rtnl_link:
2732 ovs_internal_dev_rtnl_link_unregister();
2733 error_action_fifos_exit:
2734 action_fifos_exit();
2739 static void dp_cleanup(void)
2741 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2743 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2744 unregister_pernet_device(&ovs_net_ops);
2748 ovs_internal_dev_rtnl_link_unregister();
2749 action_fifos_exit();
2752 module_init(dp_init);
2753 module_exit(dp_cleanup);
2755 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2756 MODULE_LICENSE("GPL");
2757 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2758 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2759 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2760 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2761 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2762 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);