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>
39 #include <net/net_namespace.h>
40 #include <net/netns/generic.h>
41 #include <net/pkt_cls.h>
46 #include "flow_table.h"
47 #include "flow_netlink.h"
49 #include "openvswitch_trace.h"
50 #include "vport-internal_dev.h"
51 #include "vport-netdev.h"
53 unsigned int ovs_net_id __read_mostly;
55 static struct genl_family dp_packet_genl_family;
56 static struct genl_family dp_flow_genl_family;
57 static struct genl_family dp_datapath_genl_family;
59 static const struct nla_policy flow_policy[];
61 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
62 .name = OVS_FLOW_MCGROUP,
65 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
66 .name = OVS_DATAPATH_MCGROUP,
69 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
70 .name = OVS_VPORT_MCGROUP,
73 /* Check if need to build a reply message.
74 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
75 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
78 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
79 genl_has_listeners(family, genl_info_net(info), group);
82 static void ovs_notify(struct genl_family *family,
83 struct sk_buff *skb, struct genl_info *info)
85 genl_notify(family, skb, info, 0, GFP_KERNEL);
91 * All writes e.g. Writes to device state (add/remove datapath, port, set
92 * operations on vports, etc.), Writes to other state (flow table
93 * modifications, set miscellaneous datapath parameters, etc.) are protected
96 * Reads are protected by RCU.
98 * There are a few special cases (mostly stats) that have their own
99 * synchronization but they nest under all of above and don't interact with
102 * The RTNL lock nests inside ovs_mutex.
105 static DEFINE_MUTEX(ovs_mutex);
109 mutex_lock(&ovs_mutex);
112 void ovs_unlock(void)
114 mutex_unlock(&ovs_mutex);
117 #ifdef CONFIG_LOCKDEP
118 int lockdep_ovsl_is_held(void)
121 return lockdep_is_held(&ovs_mutex);
127 static struct vport *new_vport(const struct vport_parms *);
128 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
129 const struct sw_flow_key *,
130 const struct dp_upcall_info *,
132 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
133 const struct sw_flow_key *,
134 const struct dp_upcall_info *,
137 static void ovs_dp_masks_rebalance(struct work_struct *work);
139 static int ovs_dp_set_upcall_portids(struct datapath *, const struct nlattr *);
141 /* Must be called with rcu_read_lock or ovs_mutex. */
142 const char *ovs_dp_name(const struct datapath *dp)
144 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
145 return ovs_vport_name(vport);
148 static int get_dpifindex(const struct datapath *dp)
155 local = ovs_vport_rcu(dp, OVSP_LOCAL);
157 ifindex = local->dev->ifindex;
166 static void destroy_dp_rcu(struct rcu_head *rcu)
168 struct datapath *dp = container_of(rcu, struct datapath, rcu);
170 ovs_flow_tbl_destroy(&dp->table);
171 free_percpu(dp->stats_percpu);
174 kfree(rcu_dereference_raw(dp->upcall_portids));
178 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
181 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
184 /* Called with ovs_mutex or RCU read lock. */
185 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
188 struct hlist_head *head;
190 head = vport_hash_bucket(dp, port_no);
191 hlist_for_each_entry_rcu(vport, head, dp_hash_node,
192 lockdep_ovsl_is_held()) {
193 if (vport->port_no == port_no)
199 /* Called with ovs_mutex. */
200 static struct vport *new_vport(const struct vport_parms *parms)
204 vport = ovs_vport_add(parms);
205 if (!IS_ERR(vport)) {
206 struct datapath *dp = parms->dp;
207 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
209 hlist_add_head_rcu(&vport->dp_hash_node, head);
214 static void ovs_vport_update_upcall_stats(struct sk_buff *skb,
215 const struct dp_upcall_info *upcall_info,
218 struct vport *p = OVS_CB(skb)->input_vport;
219 struct vport_upcall_stats_percpu *stats;
221 if (upcall_info->cmd != OVS_PACKET_CMD_MISS &&
222 upcall_info->cmd != OVS_PACKET_CMD_ACTION)
225 stats = this_cpu_ptr(p->upcall_stats);
226 u64_stats_update_begin(&stats->syncp);
228 u64_stats_inc(&stats->n_success);
230 u64_stats_inc(&stats->n_fail);
231 u64_stats_update_end(&stats->syncp);
234 void ovs_dp_detach_port(struct vport *p)
238 /* First drop references to device. */
239 hlist_del_rcu(&p->dp_hash_node);
241 /* Then destroy it. */
245 /* Must be called with rcu_read_lock. */
246 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
248 const struct vport *p = OVS_CB(skb)->input_vport;
249 struct datapath *dp = p->dp;
250 struct sw_flow *flow;
251 struct sw_flow_actions *sf_acts;
252 struct dp_stats_percpu *stats;
258 stats = this_cpu_ptr(dp->stats_percpu);
261 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
262 &n_mask_hit, &n_cache_hit);
263 if (unlikely(!flow)) {
264 struct dp_upcall_info upcall;
266 memset(&upcall, 0, sizeof(upcall));
267 upcall.cmd = OVS_PACKET_CMD_MISS;
269 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU)
271 ovs_dp_get_upcall_portid(dp, smp_processor_id());
273 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
275 upcall.mru = OVS_CB(skb)->mru;
276 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
288 stats_counter = &stats->n_missed;
292 ovs_flow_stats_update(flow, key->tp.flags, skb);
293 sf_acts = rcu_dereference(flow->sf_acts);
294 error = ovs_execute_actions(dp, skb, sf_acts, key);
296 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
297 ovs_dp_name(dp), error);
299 stats_counter = &stats->n_hit;
302 /* Update datapath statistics. */
303 u64_stats_update_begin(&stats->syncp);
305 stats->n_mask_hit += n_mask_hit;
306 stats->n_cache_hit += n_cache_hit;
307 u64_stats_update_end(&stats->syncp);
310 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
311 const struct sw_flow_key *key,
312 const struct dp_upcall_info *upcall_info,
315 struct dp_stats_percpu *stats;
318 if (trace_ovs_dp_upcall_enabled())
319 trace_ovs_dp_upcall(dp, skb, key, upcall_info);
321 if (upcall_info->portid == 0) {
326 if (!skb_is_gso(skb))
327 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
329 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
331 ovs_vport_update_upcall_stats(skb, upcall_info, !err);
338 stats = this_cpu_ptr(dp->stats_percpu);
340 u64_stats_update_begin(&stats->syncp);
342 u64_stats_update_end(&stats->syncp);
347 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
348 const struct sw_flow_key *key,
349 const struct dp_upcall_info *upcall_info,
352 unsigned int gso_type = skb_shinfo(skb)->gso_type;
353 struct sw_flow_key later_key;
354 struct sk_buff *segs, *nskb;
357 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET);
358 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
360 return PTR_ERR(segs);
364 if (gso_type & SKB_GSO_UDP) {
365 /* The initial flow key extracted by ovs_flow_key_extract()
366 * in this case is for a first fragment, so we need to
367 * properly mark later fragments.
370 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
373 /* Queue all of the segments. */
374 skb_list_walk_safe(segs, skb, nskb) {
375 if (gso_type & SKB_GSO_UDP && skb != segs)
378 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
384 /* Free all of the segments. */
385 skb_list_walk_safe(segs, skb, nskb) {
394 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
395 unsigned int hdrlen, int actions_attrlen)
397 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
398 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
399 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
400 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
401 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
403 /* OVS_PACKET_ATTR_USERDATA */
404 if (upcall_info->userdata)
405 size += NLA_ALIGN(upcall_info->userdata->nla_len);
407 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
408 if (upcall_info->egress_tun_info)
409 size += nla_total_size(ovs_tun_key_attr_size());
411 /* OVS_PACKET_ATTR_ACTIONS */
412 if (upcall_info->actions_len)
413 size += nla_total_size(actions_attrlen);
415 /* OVS_PACKET_ATTR_MRU */
416 if (upcall_info->mru)
417 size += nla_total_size(sizeof(upcall_info->mru));
422 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
424 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
425 size_t plen = NLA_ALIGN(skb->len) - skb->len;
428 skb_put_zero(skb, plen);
432 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
433 const struct sw_flow_key *key,
434 const struct dp_upcall_info *upcall_info,
437 struct ovs_header *upcall;
438 struct sk_buff *nskb = NULL;
439 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
446 dp_ifindex = get_dpifindex(dp);
450 if (skb_vlan_tag_present(skb)) {
451 nskb = skb_clone(skb, GFP_ATOMIC);
455 nskb = __vlan_hwaccel_push_inside(nskb);
462 if (nla_attr_size(skb->len) > USHRT_MAX) {
467 /* Complete checksum if needed */
468 if (skb->ip_summed == CHECKSUM_PARTIAL &&
469 (err = skb_csum_hwoffload_help(skb, 0)))
472 /* Older versions of OVS user space enforce alignment of the last
473 * Netlink attribute to NLA_ALIGNTO which would require extensive
474 * padding logic. Only perform zerocopy if padding is not required.
476 if (dp->user_features & OVS_DP_F_UNALIGNED)
477 hlen = skb_zerocopy_headlen(skb);
481 len = upcall_msg_size(upcall_info, hlen - cutlen,
482 OVS_CB(skb)->acts_origlen);
483 user_skb = genlmsg_new(len, GFP_ATOMIC);
489 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
490 0, upcall_info->cmd);
495 upcall->dp_ifindex = dp_ifindex;
497 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
501 if (upcall_info->userdata)
502 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
503 nla_len(upcall_info->userdata),
504 nla_data(upcall_info->userdata));
506 if (upcall_info->egress_tun_info) {
507 nla = nla_nest_start_noflag(user_skb,
508 OVS_PACKET_ATTR_EGRESS_TUN_KEY);
513 err = ovs_nla_put_tunnel_info(user_skb,
514 upcall_info->egress_tun_info);
518 nla_nest_end(user_skb, nla);
521 if (upcall_info->actions_len) {
522 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
527 err = ovs_nla_put_actions(upcall_info->actions,
528 upcall_info->actions_len,
531 nla_nest_end(user_skb, nla);
533 nla_nest_cancel(user_skb, nla);
536 /* Add OVS_PACKET_ATTR_MRU */
537 if (upcall_info->mru &&
538 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
543 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
545 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
550 /* Add OVS_PACKET_ATTR_HASH */
551 hash = skb_get_hash_raw(skb);
553 hash |= OVS_PACKET_HASH_SW_BIT;
556 hash |= OVS_PACKET_HASH_L4_BIT;
558 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
563 /* Only reserve room for attribute header, packet data is added
564 * in skb_zerocopy() */
565 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
569 nla->nla_len = nla_attr_size(skb->len - cutlen);
571 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
575 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
576 pad_packet(dp, user_skb);
578 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
580 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
585 consume_skb(user_skb);
591 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
593 struct ovs_header *ovs_header = genl_info_userhdr(info);
594 struct net *net = sock_net(skb->sk);
595 struct nlattr **a = info->attrs;
596 struct sw_flow_actions *acts;
597 struct sk_buff *packet;
598 struct sw_flow *flow;
599 struct sw_flow_actions *sf_acts;
601 struct vport *input_vport;
606 bool log = !a[OVS_PACKET_ATTR_PROBE];
609 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
610 !a[OVS_PACKET_ATTR_ACTIONS])
613 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
614 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
618 skb_reserve(packet, NET_IP_ALIGN);
620 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
622 /* Set packet's mru */
623 if (a[OVS_PACKET_ATTR_MRU]) {
624 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
625 packet->ignore_df = 1;
627 OVS_CB(packet)->mru = mru;
629 if (a[OVS_PACKET_ATTR_HASH]) {
630 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
632 __skb_set_hash(packet, hash & 0xFFFFFFFFULL,
633 !!(hash & OVS_PACKET_HASH_SW_BIT),
634 !!(hash & OVS_PACKET_HASH_L4_BIT));
637 /* Build an sw_flow for sending this packet. */
638 flow = ovs_flow_alloc();
643 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
644 packet, &flow->key, log);
648 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
649 &flow->key, &acts, log);
653 rcu_assign_pointer(flow->sf_acts, acts);
654 packet->priority = flow->key.phy.priority;
655 packet->mark = flow->key.phy.skb_mark;
658 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
663 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
665 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
670 packet->dev = input_vport->dev;
671 OVS_CB(packet)->input_vport = input_vport;
672 sf_acts = rcu_dereference(flow->sf_acts);
675 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
679 ovs_flow_free(flow, false);
685 ovs_flow_free(flow, false);
692 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
693 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
694 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
695 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
696 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
697 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
698 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
701 static const struct genl_small_ops dp_packet_genl_ops[] = {
702 { .cmd = OVS_PACKET_CMD_EXECUTE,
703 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
704 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
705 .doit = ovs_packet_cmd_execute
709 static struct genl_family dp_packet_genl_family __ro_after_init = {
710 .hdrsize = sizeof(struct ovs_header),
711 .name = OVS_PACKET_FAMILY,
712 .version = OVS_PACKET_VERSION,
713 .maxattr = OVS_PACKET_ATTR_MAX,
714 .policy = packet_policy,
716 .parallel_ops = true,
717 .small_ops = dp_packet_genl_ops,
718 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops),
719 .resv_start_op = OVS_PACKET_CMD_EXECUTE + 1,
720 .module = THIS_MODULE,
723 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
724 struct ovs_dp_megaflow_stats *mega_stats)
728 memset(mega_stats, 0, sizeof(*mega_stats));
730 stats->n_flows = ovs_flow_tbl_count(&dp->table);
731 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
733 stats->n_hit = stats->n_missed = stats->n_lost = 0;
735 for_each_possible_cpu(i) {
736 const struct dp_stats_percpu *percpu_stats;
737 struct dp_stats_percpu local_stats;
740 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
743 start = u64_stats_fetch_begin(&percpu_stats->syncp);
744 local_stats = *percpu_stats;
745 } while (u64_stats_fetch_retry(&percpu_stats->syncp, start));
747 stats->n_hit += local_stats.n_hit;
748 stats->n_missed += local_stats.n_missed;
749 stats->n_lost += local_stats.n_lost;
750 mega_stats->n_mask_hit += local_stats.n_mask_hit;
751 mega_stats->n_cache_hit += local_stats.n_cache_hit;
755 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
757 return ovs_identifier_is_ufid(sfid) &&
758 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
761 static bool should_fill_mask(uint32_t ufid_flags)
763 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
766 static bool should_fill_actions(uint32_t ufid_flags)
768 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
771 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
772 const struct sw_flow_id *sfid,
775 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
777 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
778 * see ovs_nla_put_identifier()
780 if (sfid && ovs_identifier_is_ufid(sfid))
781 len += nla_total_size(sfid->ufid_len);
783 len += nla_total_size(ovs_key_attr_size());
785 /* OVS_FLOW_ATTR_KEY */
786 if (!sfid || should_fill_key(sfid, ufid_flags))
787 len += nla_total_size(ovs_key_attr_size());
789 /* OVS_FLOW_ATTR_MASK */
790 if (should_fill_mask(ufid_flags))
791 len += nla_total_size(ovs_key_attr_size());
793 /* OVS_FLOW_ATTR_ACTIONS */
794 if (should_fill_actions(ufid_flags))
795 len += nla_total_size(acts->orig_len);
798 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
799 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
800 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
803 /* Called with ovs_mutex or RCU read lock. */
804 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
807 struct ovs_flow_stats stats;
811 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
814 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
818 if (stats.n_packets &&
819 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
820 sizeof(struct ovs_flow_stats), &stats,
824 if ((u8)ntohs(tcp_flags) &&
825 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
831 /* Called with ovs_mutex or RCU read lock. */
832 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
833 struct sk_buff *skb, int skb_orig_len)
835 struct nlattr *start;
838 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
839 * this is the first flow to be dumped into 'skb'. This is unusual for
840 * Netlink but individual action lists can be longer than
841 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
842 * The userspace caller can always fetch the actions separately if it
843 * really wants them. (Most userspace callers in fact don't care.)
845 * This can only fail for dump operations because the skb is always
846 * properly sized for single flows.
848 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
850 const struct sw_flow_actions *sf_acts;
852 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
853 err = ovs_nla_put_actions(sf_acts->actions,
854 sf_acts->actions_len, skb);
857 nla_nest_end(skb, start);
862 nla_nest_cancel(skb, start);
864 } else if (skb_orig_len) {
871 /* Called with ovs_mutex or RCU read lock. */
872 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
873 struct sk_buff *skb, u32 portid,
874 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
876 const int skb_orig_len = skb->len;
877 struct ovs_header *ovs_header;
880 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
885 ovs_header->dp_ifindex = dp_ifindex;
887 err = ovs_nla_put_identifier(flow, skb);
891 if (should_fill_key(&flow->id, ufid_flags)) {
892 err = ovs_nla_put_masked_key(flow, skb);
897 if (should_fill_mask(ufid_flags)) {
898 err = ovs_nla_put_mask(flow, skb);
903 err = ovs_flow_cmd_fill_stats(flow, skb);
907 if (should_fill_actions(ufid_flags)) {
908 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
913 genlmsg_end(skb, ovs_header);
917 genlmsg_cancel(skb, ovs_header);
921 /* May not be called with RCU read lock. */
922 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
923 const struct sw_flow_id *sfid,
924 struct genl_info *info,
931 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
934 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
935 skb = genlmsg_new(len, GFP_KERNEL);
937 return ERR_PTR(-ENOMEM);
942 /* Called with ovs_mutex. */
943 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
945 struct genl_info *info, u8 cmd,
946 bool always, u32 ufid_flags)
951 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
952 &flow->id, info, always, ufid_flags);
953 if (IS_ERR_OR_NULL(skb))
956 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
957 info->snd_portid, info->snd_seq, 0,
959 if (WARN_ON_ONCE(retval < 0)) {
961 skb = ERR_PTR(retval);
966 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
968 struct net *net = sock_net(skb->sk);
969 struct nlattr **a = info->attrs;
970 struct ovs_header *ovs_header = genl_info_userhdr(info);
971 struct sw_flow *flow = NULL, *new_flow;
972 struct sw_flow_mask mask;
973 struct sk_buff *reply;
975 struct sw_flow_key *key;
976 struct sw_flow_actions *acts;
977 struct sw_flow_match match;
978 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
980 bool log = !a[OVS_FLOW_ATTR_PROBE];
982 /* Must have key and actions. */
984 if (!a[OVS_FLOW_ATTR_KEY]) {
985 OVS_NLERR(log, "Flow key attr not present in new flow.");
988 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
989 OVS_NLERR(log, "Flow actions attr not present in new flow.");
993 /* Most of the time we need to allocate a new flow, do it before
996 new_flow = ovs_flow_alloc();
997 if (IS_ERR(new_flow)) {
998 error = PTR_ERR(new_flow);
1003 key = kzalloc(sizeof(*key), GFP_KERNEL);
1006 goto err_kfree_flow;
1009 ovs_match_init(&match, key, false, &mask);
1010 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1011 a[OVS_FLOW_ATTR_MASK], log);
1015 ovs_flow_mask_key(&new_flow->key, key, true, &mask);
1017 /* Extract flow identifier. */
1018 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
1023 /* Validate actions. */
1024 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
1025 &new_flow->key, &acts, log);
1027 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
1031 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
1033 if (IS_ERR(reply)) {
1034 error = PTR_ERR(reply);
1035 goto err_kfree_acts;
1039 dp = get_dp(net, ovs_header->dp_ifindex);
1040 if (unlikely(!dp)) {
1042 goto err_unlock_ovs;
1045 /* Check if this is a duplicate flow */
1046 if (ovs_identifier_is_ufid(&new_flow->id))
1047 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
1049 flow = ovs_flow_tbl_lookup(&dp->table, key);
1050 if (likely(!flow)) {
1051 rcu_assign_pointer(new_flow->sf_acts, acts);
1053 /* Put flow in bucket. */
1054 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1055 if (unlikely(error)) {
1057 goto err_unlock_ovs;
1060 if (unlikely(reply)) {
1061 error = ovs_flow_cmd_fill_info(new_flow,
1062 ovs_header->dp_ifindex,
1063 reply, info->snd_portid,
1071 struct sw_flow_actions *old_acts;
1073 /* Bail out if we're not allowed to modify an existing flow.
1074 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1075 * because Generic Netlink treats the latter as a dump
1076 * request. We also accept NLM_F_EXCL in case that bug ever
1079 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1082 goto err_unlock_ovs;
1084 /* The flow identifier has to be the same for flow updates.
1085 * Look for any overlapping flow.
1087 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1088 if (ovs_identifier_is_key(&flow->id))
1089 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1091 else /* UFID matches but key is different */
1095 goto err_unlock_ovs;
1098 /* Update actions. */
1099 old_acts = ovsl_dereference(flow->sf_acts);
1100 rcu_assign_pointer(flow->sf_acts, acts);
1102 if (unlikely(reply)) {
1103 error = ovs_flow_cmd_fill_info(flow,
1104 ovs_header->dp_ifindex,
1105 reply, info->snd_portid,
1113 ovs_nla_free_flow_actions_rcu(old_acts);
1114 ovs_flow_free(new_flow, false);
1118 ovs_notify(&dp_flow_genl_family, reply, info);
1127 ovs_nla_free_flow_actions(acts);
1131 ovs_flow_free(new_flow, false);
1136 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1137 static noinline_for_stack
1138 struct sw_flow_actions *get_flow_actions(struct net *net,
1139 const struct nlattr *a,
1140 const struct sw_flow_key *key,
1141 const struct sw_flow_mask *mask,
1144 struct sw_flow_actions *acts;
1145 struct sw_flow_key masked_key;
1148 ovs_flow_mask_key(&masked_key, key, true, mask);
1149 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1152 "Actions may not be safe on all matching packets");
1153 return ERR_PTR(error);
1159 /* Factor out match-init and action-copy to avoid
1160 * "Wframe-larger-than=1024" warning. Because mask is only
1161 * used to get actions, we new a function to save some
1164 * If there are not key and action attrs, we return 0
1165 * directly. In the case, the caller will also not use the
1166 * match as before. If there is action attr, we try to get
1167 * actions and save them to *acts. Before returning from
1168 * the function, we reset the match->mask pointer. Because
1169 * we should not to return match object with dangling reference
1172 static noinline_for_stack int
1173 ovs_nla_init_match_and_action(struct net *net,
1174 struct sw_flow_match *match,
1175 struct sw_flow_key *key,
1177 struct sw_flow_actions **acts,
1180 struct sw_flow_mask mask;
1183 if (a[OVS_FLOW_ATTR_KEY]) {
1184 ovs_match_init(match, key, true, &mask);
1185 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1186 a[OVS_FLOW_ATTR_MASK], log);
1191 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1192 if (!a[OVS_FLOW_ATTR_KEY]) {
1194 "Flow key attribute not present in set flow.");
1199 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1201 if (IS_ERR(*acts)) {
1202 error = PTR_ERR(*acts);
1207 /* On success, error is 0. */
1213 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1215 struct net *net = sock_net(skb->sk);
1216 struct nlattr **a = info->attrs;
1217 struct ovs_header *ovs_header = genl_info_userhdr(info);
1218 struct sw_flow_key key;
1219 struct sw_flow *flow;
1220 struct sk_buff *reply = NULL;
1221 struct datapath *dp;
1222 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1223 struct sw_flow_match match;
1224 struct sw_flow_id sfid;
1225 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1227 bool log = !a[OVS_FLOW_ATTR_PROBE];
1230 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1231 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1233 "Flow set message rejected, Key attribute missing.");
1237 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1243 /* Can allocate before locking if have acts. */
1244 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1246 if (IS_ERR(reply)) {
1247 error = PTR_ERR(reply);
1248 goto err_kfree_acts;
1253 dp = get_dp(net, ovs_header->dp_ifindex);
1254 if (unlikely(!dp)) {
1256 goto err_unlock_ovs;
1258 /* Check that the flow exists. */
1260 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1262 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1263 if (unlikely(!flow)) {
1265 goto err_unlock_ovs;
1268 /* Update actions, if present. */
1270 old_acts = ovsl_dereference(flow->sf_acts);
1271 rcu_assign_pointer(flow->sf_acts, acts);
1273 if (unlikely(reply)) {
1274 error = ovs_flow_cmd_fill_info(flow,
1275 ovs_header->dp_ifindex,
1276 reply, info->snd_portid,
1283 /* Could not alloc without acts before locking. */
1284 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1285 info, OVS_FLOW_CMD_SET, false,
1288 if (IS_ERR(reply)) {
1289 error = PTR_ERR(reply);
1290 goto err_unlock_ovs;
1295 if (a[OVS_FLOW_ATTR_CLEAR])
1296 ovs_flow_stats_clear(flow);
1300 ovs_notify(&dp_flow_genl_family, reply, info);
1302 ovs_nla_free_flow_actions_rcu(old_acts);
1310 ovs_nla_free_flow_actions(acts);
1315 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1317 struct nlattr **a = info->attrs;
1318 struct ovs_header *ovs_header = genl_info_userhdr(info);
1319 struct net *net = sock_net(skb->sk);
1320 struct sw_flow_key key;
1321 struct sk_buff *reply;
1322 struct sw_flow *flow;
1323 struct datapath *dp;
1324 struct sw_flow_match match;
1325 struct sw_flow_id ufid;
1326 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1328 bool log = !a[OVS_FLOW_ATTR_PROBE];
1331 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1332 if (a[OVS_FLOW_ATTR_KEY]) {
1333 ovs_match_init(&match, &key, true, NULL);
1334 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1336 } else if (!ufid_present) {
1338 "Flow get message rejected, Key attribute missing.");
1345 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1352 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1354 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1360 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1361 OVS_FLOW_CMD_GET, true, ufid_flags);
1362 if (IS_ERR(reply)) {
1363 err = PTR_ERR(reply);
1368 return genlmsg_reply(reply, info);
1374 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1376 struct nlattr **a = info->attrs;
1377 struct ovs_header *ovs_header = genl_info_userhdr(info);
1378 struct net *net = sock_net(skb->sk);
1379 struct sw_flow_key key;
1380 struct sk_buff *reply;
1381 struct sw_flow *flow = NULL;
1382 struct datapath *dp;
1383 struct sw_flow_match match;
1384 struct sw_flow_id ufid;
1385 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1387 bool log = !a[OVS_FLOW_ATTR_PROBE];
1390 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1391 if (a[OVS_FLOW_ATTR_KEY]) {
1392 ovs_match_init(&match, &key, true, NULL);
1393 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1400 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1401 if (unlikely(!dp)) {
1406 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1407 err = ovs_flow_tbl_flush(&dp->table);
1412 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1414 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1415 if (unlikely(!flow)) {
1420 ovs_flow_tbl_remove(&dp->table, flow);
1423 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1424 &flow->id, info, false, ufid_flags);
1425 if (likely(reply)) {
1426 if (!IS_ERR(reply)) {
1427 rcu_read_lock(); /*To keep RCU checker happy. */
1428 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1429 reply, info->snd_portid,
1434 if (WARN_ON_ONCE(err < 0)) {
1439 ovs_notify(&dp_flow_genl_family, reply, info);
1441 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0,
1447 ovs_flow_free(flow, true);
1454 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1456 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1457 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1458 struct table_instance *ti;
1459 struct datapath *dp;
1463 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1464 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1467 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1470 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1476 ti = rcu_dereference(dp->table.ti);
1478 struct sw_flow *flow;
1481 bucket = cb->args[0];
1483 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1487 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1488 NETLINK_CB(cb->skb).portid,
1489 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1490 OVS_FLOW_CMD_GET, ufid_flags) < 0)
1493 cb->args[0] = bucket;
1500 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1501 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1502 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1503 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1504 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1505 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1506 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1507 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1510 static const struct genl_small_ops dp_flow_genl_ops[] = {
1511 { .cmd = OVS_FLOW_CMD_NEW,
1512 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1513 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1514 .doit = ovs_flow_cmd_new
1516 { .cmd = OVS_FLOW_CMD_DEL,
1517 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1518 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1519 .doit = ovs_flow_cmd_del
1521 { .cmd = OVS_FLOW_CMD_GET,
1522 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1523 .flags = 0, /* OK for unprivileged users. */
1524 .doit = ovs_flow_cmd_get,
1525 .dumpit = ovs_flow_cmd_dump
1527 { .cmd = OVS_FLOW_CMD_SET,
1528 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1529 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1530 .doit = ovs_flow_cmd_set,
1534 static struct genl_family dp_flow_genl_family __ro_after_init = {
1535 .hdrsize = sizeof(struct ovs_header),
1536 .name = OVS_FLOW_FAMILY,
1537 .version = OVS_FLOW_VERSION,
1538 .maxattr = OVS_FLOW_ATTR_MAX,
1539 .policy = flow_policy,
1541 .parallel_ops = true,
1542 .small_ops = dp_flow_genl_ops,
1543 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops),
1544 .resv_start_op = OVS_FLOW_CMD_SET + 1,
1545 .mcgrps = &ovs_dp_flow_multicast_group,
1547 .module = THIS_MODULE,
1550 static size_t ovs_dp_cmd_msg_size(void)
1552 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1554 msgsize += nla_total_size(IFNAMSIZ);
1555 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1556 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1557 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1558 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
1559 msgsize += nla_total_size(sizeof(u32) * nr_cpu_ids); /* OVS_DP_ATTR_PER_CPU_PIDS */
1564 /* Called with ovs_mutex. */
1565 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1566 u32 portid, u32 seq, u32 flags, u8 cmd)
1568 struct ovs_header *ovs_header;
1569 struct ovs_dp_stats dp_stats;
1570 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1571 struct dp_nlsk_pids *pids = ovsl_dereference(dp->upcall_portids);
1574 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1579 ovs_header->dp_ifindex = get_dpifindex(dp);
1581 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1583 goto nla_put_failure;
1585 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1586 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1587 &dp_stats, OVS_DP_ATTR_PAD))
1588 goto nla_put_failure;
1590 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1591 sizeof(struct ovs_dp_megaflow_stats),
1592 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1593 goto nla_put_failure;
1595 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1596 goto nla_put_failure;
1598 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE,
1599 ovs_flow_tbl_masks_cache_size(&dp->table)))
1600 goto nla_put_failure;
1602 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && pids) {
1603 pids_len = min(pids->n_pids, nr_cpu_ids) * sizeof(u32);
1604 if (nla_put(skb, OVS_DP_ATTR_PER_CPU_PIDS, pids_len, &pids->pids))
1605 goto nla_put_failure;
1608 genlmsg_end(skb, ovs_header);
1612 genlmsg_cancel(skb, ovs_header);
1617 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1619 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1622 /* Called with rcu_read_lock or ovs_mutex. */
1623 static struct datapath *lookup_datapath(struct net *net,
1624 const struct ovs_header *ovs_header,
1625 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1627 struct datapath *dp;
1629 if (!a[OVS_DP_ATTR_NAME])
1630 dp = get_dp(net, ovs_header->dp_ifindex);
1632 struct vport *vport;
1634 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1635 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1637 return dp ? dp : ERR_PTR(-ENODEV);
1640 static void ovs_dp_reset_user_features(struct sk_buff *skb,
1641 struct genl_info *info)
1643 struct datapath *dp;
1645 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
1650 pr_warn("%s: Dropping previously announced user features\n",
1652 dp->user_features = 0;
1655 static int ovs_dp_set_upcall_portids(struct datapath *dp,
1656 const struct nlattr *ids)
1658 struct dp_nlsk_pids *old, *dp_nlsk_pids;
1660 if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
1663 old = ovsl_dereference(dp->upcall_portids);
1665 dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids),
1670 dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32);
1671 nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids));
1673 rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids);
1675 kfree_rcu(old, rcu);
1680 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id)
1682 struct dp_nlsk_pids *dp_nlsk_pids;
1684 dp_nlsk_pids = rcu_dereference(dp->upcall_portids);
1687 if (cpu_id < dp_nlsk_pids->n_pids) {
1688 return dp_nlsk_pids->pids[cpu_id];
1689 } else if (dp_nlsk_pids->n_pids > 0 &&
1690 cpu_id >= dp_nlsk_pids->n_pids) {
1691 /* If the number of netlink PIDs is mismatched with
1692 * the number of CPUs as seen by the kernel, log this
1693 * and send the upcall to an arbitrary socket (0) in
1694 * order to not drop packets
1696 pr_info_ratelimited("cpu_id mismatch with handler threads");
1697 return dp_nlsk_pids->pids[cpu_id %
1698 dp_nlsk_pids->n_pids];
1707 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1709 u32 user_features = 0, old_features = dp->user_features;
1712 if (a[OVS_DP_ATTR_USER_FEATURES]) {
1713 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1715 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1716 OVS_DP_F_UNALIGNED |
1717 OVS_DP_F_TC_RECIRC_SHARING |
1718 OVS_DP_F_DISPATCH_UPCALL_PER_CPU))
1721 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1722 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1727 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
1731 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
1732 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size);
1737 dp->user_features = user_features;
1739 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU &&
1740 a[OVS_DP_ATTR_PER_CPU_PIDS]) {
1741 /* Upcall Netlink Port IDs have been updated */
1742 err = ovs_dp_set_upcall_portids(dp,
1743 a[OVS_DP_ATTR_PER_CPU_PIDS]);
1748 if ((dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1749 !(old_features & OVS_DP_F_TC_RECIRC_SHARING))
1750 tc_skb_ext_tc_enable();
1751 else if (!(dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1752 (old_features & OVS_DP_F_TC_RECIRC_SHARING))
1753 tc_skb_ext_tc_disable();
1758 static int ovs_dp_stats_init(struct datapath *dp)
1760 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1761 if (!dp->stats_percpu)
1767 static int ovs_dp_vport_init(struct datapath *dp)
1771 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1772 sizeof(struct hlist_head),
1777 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1778 INIT_HLIST_HEAD(&dp->ports[i]);
1783 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1785 struct nlattr **a = info->attrs;
1786 struct vport_parms parms;
1787 struct sk_buff *reply;
1788 struct datapath *dp;
1789 struct vport *vport;
1790 struct ovs_net *ovs_net;
1794 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1797 reply = ovs_dp_cmd_alloc_info();
1802 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1804 goto err_destroy_reply;
1806 ovs_dp_set_net(dp, sock_net(skb->sk));
1808 /* Allocate table. */
1809 err = ovs_flow_tbl_init(&dp->table);
1811 goto err_destroy_dp;
1813 err = ovs_dp_stats_init(dp);
1815 goto err_destroy_table;
1817 err = ovs_dp_vport_init(dp);
1819 goto err_destroy_stats;
1821 err = ovs_meters_init(dp);
1823 goto err_destroy_ports;
1825 /* Set up our datapath device. */
1826 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1827 parms.type = OVS_VPORT_TYPE_INTERNAL;
1828 parms.options = NULL;
1830 parms.port_no = OVSP_LOCAL;
1831 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1832 parms.desired_ifindex = a[OVS_DP_ATTR_IFINDEX]
1833 ? nla_get_s32(a[OVS_DP_ATTR_IFINDEX]) : 0;
1835 /* So far only local changes have been made, now need the lock. */
1838 err = ovs_dp_change(dp, a);
1840 goto err_unlock_and_destroy_meters;
1842 vport = new_vport(&parms);
1843 if (IS_ERR(vport)) {
1844 err = PTR_ERR(vport);
1848 if (err == -EEXIST) {
1849 /* An outdated user space instance that does not understand
1850 * the concept of user_features has attempted to create a new
1851 * datapath and is likely to reuse it. Drop all user features.
1853 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1854 ovs_dp_reset_user_features(skb, info);
1857 goto err_destroy_portids;
1860 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1861 info->snd_seq, 0, OVS_DP_CMD_NEW);
1864 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1865 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1869 ovs_notify(&dp_datapath_genl_family, reply, info);
1872 err_destroy_portids:
1873 kfree(rcu_dereference_raw(dp->upcall_portids));
1874 err_unlock_and_destroy_meters:
1876 ovs_meters_exit(dp);
1880 free_percpu(dp->stats_percpu);
1882 ovs_flow_tbl_destroy(&dp->table);
1891 /* Called with ovs_mutex. */
1892 static void __dp_destroy(struct datapath *dp)
1894 struct flow_table *table = &dp->table;
1897 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1898 tc_skb_ext_tc_disable();
1900 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1901 struct vport *vport;
1902 struct hlist_node *n;
1904 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1905 if (vport->port_no != OVSP_LOCAL)
1906 ovs_dp_detach_port(vport);
1909 list_del_rcu(&dp->list_node);
1911 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1912 * all ports in datapath are destroyed first before freeing datapath.
1914 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1916 /* Flush sw_flow in the tables. RCU cb only releases resource
1917 * such as dp, ports and tables. That may avoid some issues
1918 * such as RCU usage warning.
1920 table_instance_flow_flush(table, ovsl_dereference(table->ti),
1921 ovsl_dereference(table->ufid_ti));
1923 /* RCU destroy the ports, meters and flow tables. */
1924 call_rcu(&dp->rcu, destroy_dp_rcu);
1927 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1929 struct sk_buff *reply;
1930 struct datapath *dp;
1933 reply = ovs_dp_cmd_alloc_info();
1938 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
1942 goto err_unlock_free;
1944 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1945 info->snd_seq, 0, OVS_DP_CMD_DEL);
1951 ovs_notify(&dp_datapath_genl_family, reply, info);
1961 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1963 struct sk_buff *reply;
1964 struct datapath *dp;
1967 reply = ovs_dp_cmd_alloc_info();
1972 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
1976 goto err_unlock_free;
1978 err = ovs_dp_change(dp, info->attrs);
1980 goto err_unlock_free;
1982 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1983 info->snd_seq, 0, OVS_DP_CMD_SET);
1987 ovs_notify(&dp_datapath_genl_family, reply, info);
1997 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1999 struct sk_buff *reply;
2000 struct datapath *dp;
2003 reply = ovs_dp_cmd_alloc_info();
2008 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
2012 goto err_unlock_free;
2014 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
2015 info->snd_seq, 0, OVS_DP_CMD_GET);
2019 return genlmsg_reply(reply, info);
2027 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2029 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
2030 struct datapath *dp;
2031 int skip = cb->args[0];
2035 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2037 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
2038 cb->nlh->nlmsg_seq, NLM_F_MULTI,
2039 OVS_DP_CMD_GET) < 0)
2050 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
2051 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2052 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2053 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
2054 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0,
2055 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
2056 [OVS_DP_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 0),
2059 static const struct genl_small_ops dp_datapath_genl_ops[] = {
2060 { .cmd = OVS_DP_CMD_NEW,
2061 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2062 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2063 .doit = ovs_dp_cmd_new
2065 { .cmd = OVS_DP_CMD_DEL,
2066 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2067 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2068 .doit = ovs_dp_cmd_del
2070 { .cmd = OVS_DP_CMD_GET,
2071 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2072 .flags = 0, /* OK for unprivileged users. */
2073 .doit = ovs_dp_cmd_get,
2074 .dumpit = ovs_dp_cmd_dump
2076 { .cmd = OVS_DP_CMD_SET,
2077 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2078 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2079 .doit = ovs_dp_cmd_set,
2083 static struct genl_family dp_datapath_genl_family __ro_after_init = {
2084 .hdrsize = sizeof(struct ovs_header),
2085 .name = OVS_DATAPATH_FAMILY,
2086 .version = OVS_DATAPATH_VERSION,
2087 .maxattr = OVS_DP_ATTR_MAX,
2088 .policy = datapath_policy,
2090 .parallel_ops = true,
2091 .small_ops = dp_datapath_genl_ops,
2092 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops),
2093 .resv_start_op = OVS_DP_CMD_SET + 1,
2094 .mcgrps = &ovs_dp_datapath_multicast_group,
2096 .module = THIS_MODULE,
2099 /* Called with ovs_mutex or RCU read lock. */
2100 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
2101 struct net *net, u32 portid, u32 seq,
2102 u32 flags, u8 cmd, gfp_t gfp)
2104 struct ovs_header *ovs_header;
2105 struct ovs_vport_stats vport_stats;
2108 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
2113 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
2115 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
2116 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
2117 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
2118 ovs_vport_name(vport)) ||
2119 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
2120 goto nla_put_failure;
2122 if (!net_eq(net, dev_net(vport->dev))) {
2123 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
2125 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
2126 goto nla_put_failure;
2129 ovs_vport_get_stats(vport, &vport_stats);
2130 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
2131 sizeof(struct ovs_vport_stats), &vport_stats,
2132 OVS_VPORT_ATTR_PAD))
2133 goto nla_put_failure;
2135 if (ovs_vport_get_upcall_stats(vport, skb))
2136 goto nla_put_failure;
2138 if (ovs_vport_get_upcall_portids(vport, skb))
2139 goto nla_put_failure;
2141 err = ovs_vport_get_options(vport, skb);
2142 if (err == -EMSGSIZE)
2145 genlmsg_end(skb, ovs_header);
2151 genlmsg_cancel(skb, ovs_header);
2155 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
2157 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2160 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
2161 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
2162 u32 portid, u32 seq, u8 cmd)
2164 struct sk_buff *skb;
2167 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2169 return ERR_PTR(-ENOMEM);
2171 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
2178 /* Called with ovs_mutex or RCU read lock. */
2179 static struct vport *lookup_vport(struct net *net,
2180 const struct ovs_header *ovs_header,
2181 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2183 struct datapath *dp;
2184 struct vport *vport;
2186 if (a[OVS_VPORT_ATTR_IFINDEX])
2187 return ERR_PTR(-EOPNOTSUPP);
2188 if (a[OVS_VPORT_ATTR_NAME]) {
2189 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2191 return ERR_PTR(-ENODEV);
2192 if (ovs_header->dp_ifindex &&
2193 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2194 return ERR_PTR(-ENODEV);
2196 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2197 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2199 if (port_no >= DP_MAX_PORTS)
2200 return ERR_PTR(-EFBIG);
2202 dp = get_dp(net, ovs_header->dp_ifindex);
2204 return ERR_PTR(-ENODEV);
2206 vport = ovs_vport_ovsl_rcu(dp, port_no);
2208 return ERR_PTR(-ENODEV);
2211 return ERR_PTR(-EINVAL);
2215 static unsigned int ovs_get_max_headroom(struct datapath *dp)
2217 unsigned int dev_headroom, max_headroom = 0;
2218 struct net_device *dev;
2219 struct vport *vport;
2222 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2223 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2224 lockdep_ovsl_is_held()) {
2226 dev_headroom = netdev_get_fwd_headroom(dev);
2227 if (dev_headroom > max_headroom)
2228 max_headroom = dev_headroom;
2232 return max_headroom;
2235 /* Called with ovs_mutex */
2236 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2238 struct vport *vport;
2241 dp->max_headroom = new_headroom;
2242 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2243 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2244 lockdep_ovsl_is_held())
2245 netdev_set_rx_headroom(vport->dev, new_headroom);
2249 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2251 struct nlattr **a = info->attrs;
2252 struct ovs_header *ovs_header = genl_info_userhdr(info);
2253 struct vport_parms parms;
2254 struct sk_buff *reply;
2255 struct vport *vport;
2256 struct datapath *dp;
2257 unsigned int new_headroom;
2261 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2262 !a[OVS_VPORT_ATTR_UPCALL_PID])
2265 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2267 if (a[OVS_VPORT_ATTR_IFINDEX] && parms.type != OVS_VPORT_TYPE_INTERNAL)
2270 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2271 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2272 if (port_no >= DP_MAX_PORTS)
2275 reply = ovs_vport_cmd_alloc_info();
2281 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2284 goto exit_unlock_free;
2287 vport = ovs_vport_ovsl(dp, port_no);
2290 goto exit_unlock_free;
2292 for (port_no = 1; ; port_no++) {
2293 if (port_no >= DP_MAX_PORTS) {
2295 goto exit_unlock_free;
2297 vport = ovs_vport_ovsl(dp, port_no);
2303 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2304 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2306 parms.port_no = port_no;
2307 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2308 parms.desired_ifindex = a[OVS_VPORT_ATTR_IFINDEX]
2309 ? nla_get_s32(a[OVS_VPORT_ATTR_IFINDEX]) : 0;
2311 vport = new_vport(&parms);
2312 err = PTR_ERR(vport);
2313 if (IS_ERR(vport)) {
2316 goto exit_unlock_free;
2319 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2320 info->snd_portid, info->snd_seq, 0,
2321 OVS_VPORT_CMD_NEW, GFP_KERNEL);
2323 new_headroom = netdev_get_fwd_headroom(vport->dev);
2325 if (new_headroom > dp->max_headroom)
2326 ovs_update_headroom(dp, new_headroom);
2328 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2333 ovs_notify(&dp_vport_genl_family, reply, info);
2342 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2344 struct nlattr **a = info->attrs;
2345 struct sk_buff *reply;
2346 struct vport *vport;
2349 reply = ovs_vport_cmd_alloc_info();
2354 vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), a);
2355 err = PTR_ERR(vport);
2357 goto exit_unlock_free;
2359 if (a[OVS_VPORT_ATTR_TYPE] &&
2360 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2362 goto exit_unlock_free;
2365 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2366 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2368 goto exit_unlock_free;
2372 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2373 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2375 err = ovs_vport_set_upcall_portids(vport, ids);
2377 goto exit_unlock_free;
2380 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2381 info->snd_portid, info->snd_seq, 0,
2382 OVS_VPORT_CMD_SET, GFP_KERNEL);
2386 ovs_notify(&dp_vport_genl_family, reply, info);
2395 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2397 bool update_headroom = false;
2398 struct nlattr **a = info->attrs;
2399 struct sk_buff *reply;
2400 struct datapath *dp;
2401 struct vport *vport;
2402 unsigned int new_headroom;
2405 reply = ovs_vport_cmd_alloc_info();
2410 vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), a);
2411 err = PTR_ERR(vport);
2413 goto exit_unlock_free;
2415 if (vport->port_no == OVSP_LOCAL) {
2417 goto exit_unlock_free;
2420 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2421 info->snd_portid, info->snd_seq, 0,
2422 OVS_VPORT_CMD_DEL, GFP_KERNEL);
2425 /* the vport deletion may trigger dp headroom update */
2427 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2428 update_headroom = true;
2430 netdev_reset_rx_headroom(vport->dev);
2431 ovs_dp_detach_port(vport);
2433 if (update_headroom) {
2434 new_headroom = ovs_get_max_headroom(dp);
2436 if (new_headroom < dp->max_headroom)
2437 ovs_update_headroom(dp, new_headroom);
2441 ovs_notify(&dp_vport_genl_family, reply, info);
2450 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2452 struct nlattr **a = info->attrs;
2453 struct ovs_header *ovs_header = genl_info_userhdr(info);
2454 struct sk_buff *reply;
2455 struct vport *vport;
2458 reply = ovs_vport_cmd_alloc_info();
2463 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2464 err = PTR_ERR(vport);
2466 goto exit_unlock_free;
2467 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2468 info->snd_portid, info->snd_seq, 0,
2469 OVS_VPORT_CMD_GET, GFP_ATOMIC);
2473 return genlmsg_reply(reply, info);
2481 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2483 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2484 struct datapath *dp;
2485 int bucket = cb->args[0], skip = cb->args[1];
2489 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2494 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2495 struct vport *vport;
2498 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2500 ovs_vport_cmd_fill_info(vport, skb,
2502 NETLINK_CB(cb->skb).portid,
2522 static void ovs_dp_masks_rebalance(struct work_struct *work)
2524 struct ovs_net *ovs_net = container_of(work, struct ovs_net,
2525 masks_rebalance.work);
2526 struct datapath *dp;
2530 list_for_each_entry(dp, &ovs_net->dps, list_node)
2531 ovs_flow_masks_rebalance(&dp->table);
2535 schedule_delayed_work(&ovs_net->masks_rebalance,
2536 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2539 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2540 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2541 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2542 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2543 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2544 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2545 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2546 [OVS_VPORT_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 0),
2547 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2548 [OVS_VPORT_ATTR_UPCALL_STATS] = { .type = NLA_NESTED },
2551 static const struct genl_small_ops dp_vport_genl_ops[] = {
2552 { .cmd = OVS_VPORT_CMD_NEW,
2553 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2554 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2555 .doit = ovs_vport_cmd_new
2557 { .cmd = OVS_VPORT_CMD_DEL,
2558 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2559 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2560 .doit = ovs_vport_cmd_del
2562 { .cmd = OVS_VPORT_CMD_GET,
2563 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2564 .flags = 0, /* OK for unprivileged users. */
2565 .doit = ovs_vport_cmd_get,
2566 .dumpit = ovs_vport_cmd_dump
2568 { .cmd = OVS_VPORT_CMD_SET,
2569 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2570 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2571 .doit = ovs_vport_cmd_set,
2575 struct genl_family dp_vport_genl_family __ro_after_init = {
2576 .hdrsize = sizeof(struct ovs_header),
2577 .name = OVS_VPORT_FAMILY,
2578 .version = OVS_VPORT_VERSION,
2579 .maxattr = OVS_VPORT_ATTR_MAX,
2580 .policy = vport_policy,
2582 .parallel_ops = true,
2583 .small_ops = dp_vport_genl_ops,
2584 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops),
2585 .resv_start_op = OVS_VPORT_CMD_SET + 1,
2586 .mcgrps = &ovs_dp_vport_multicast_group,
2588 .module = THIS_MODULE,
2591 static struct genl_family * const dp_genl_families[] = {
2592 &dp_datapath_genl_family,
2593 &dp_vport_genl_family,
2594 &dp_flow_genl_family,
2595 &dp_packet_genl_family,
2596 &dp_meter_genl_family,
2597 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2598 &dp_ct_limit_genl_family,
2602 static void dp_unregister_genl(int n_families)
2606 for (i = 0; i < n_families; i++)
2607 genl_unregister_family(dp_genl_families[i]);
2610 static int __init dp_register_genl(void)
2615 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2617 err = genl_register_family(dp_genl_families[i]);
2625 dp_unregister_genl(i);
2629 static int __net_init ovs_init_net(struct net *net)
2631 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2634 INIT_LIST_HEAD(&ovs_net->dps);
2635 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2636 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
2638 err = ovs_ct_init(net);
2642 schedule_delayed_work(&ovs_net->masks_rebalance,
2643 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2647 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2648 struct list_head *head)
2650 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2651 struct datapath *dp;
2653 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2656 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2657 struct vport *vport;
2659 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2660 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2663 if (dev_net(vport->dev) == dnet)
2664 list_add(&vport->detach_list, head);
2670 static void __net_exit ovs_exit_net(struct net *dnet)
2672 struct datapath *dp, *dp_next;
2673 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2674 struct vport *vport, *vport_next;
2682 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2685 down_read(&net_rwsem);
2687 list_vports_from_net(net, dnet, &head);
2688 up_read(&net_rwsem);
2690 /* Detach all vports from given namespace. */
2691 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2692 list_del(&vport->detach_list);
2693 ovs_dp_detach_port(vport);
2698 cancel_delayed_work_sync(&ovs_net->masks_rebalance);
2699 cancel_work_sync(&ovs_net->dp_notify_work);
2702 static struct pernet_operations ovs_net_ops = {
2703 .init = ovs_init_net,
2704 .exit = ovs_exit_net,
2706 .size = sizeof(struct ovs_net),
2709 static const char * const ovs_drop_reasons[] = {
2715 static struct drop_reason_list drop_reason_list_ovs = {
2716 .reasons = ovs_drop_reasons,
2717 .n_reasons = ARRAY_SIZE(ovs_drop_reasons),
2720 static int __init dp_init(void)
2724 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) >
2725 sizeof_field(struct sk_buff, cb));
2727 pr_info("Open vSwitch switching datapath\n");
2729 err = action_fifos_init();
2733 err = ovs_internal_dev_rtnl_link_register();
2735 goto error_action_fifos_exit;
2737 err = ovs_flow_init();
2739 goto error_unreg_rtnl_link;
2741 err = ovs_vport_init();
2743 goto error_flow_exit;
2745 err = register_pernet_device(&ovs_net_ops);
2747 goto error_vport_exit;
2749 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2751 goto error_netns_exit;
2753 err = ovs_netdev_init();
2755 goto error_unreg_notifier;
2757 err = dp_register_genl();
2759 goto error_unreg_netdev;
2761 drop_reasons_register_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH,
2762 &drop_reason_list_ovs);
2768 error_unreg_notifier:
2769 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2771 unregister_pernet_device(&ovs_net_ops);
2776 error_unreg_rtnl_link:
2777 ovs_internal_dev_rtnl_link_unregister();
2778 error_action_fifos_exit:
2779 action_fifos_exit();
2784 static void dp_cleanup(void)
2786 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2788 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2789 unregister_pernet_device(&ovs_net_ops);
2790 drop_reasons_unregister_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH);
2794 ovs_internal_dev_rtnl_link_unregister();
2795 action_fifos_exit();
2798 module_init(dp_init);
2799 module_exit(dp_cleanup);
2801 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2802 MODULE_LICENSE("GPL");
2803 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2804 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2805 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2806 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2807 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2808 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);